A-6310 Spec for Field Instrumentation

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Abu Dhabi Water & Electricity Authority

SPECIFICATION FOR FIELD

INSTRUMENTATION

2 03-02-2009 Flow sensors and metering system revised, Kiosk, Data logger added1 31-04-2004 Revised to incorporate changes as marked0 0 2 -0 2 -2 0 0 2 Approved Issuerev. date Description/issued for prepared authorised

client: ADWEAV ~ - proiect: STANDARD SPECIFICATIONS FOR WATER WORKS\ title: SPECIFICATION FOR FIELD INSTRUMENTATIONproject phase: |project: |document: W-l-SS-001 | rev: 2 | sheet: 1 of: 45

Ci^jUuUJ "dSjJLCODE Contracting Co. (L.L.C.)

P.O. Box: 25224-A hu Dhabi

1. GENERAL.............................................................................................................. 4

2. APPLICABLE STANDARDS AND CODES........................................................ 5

2.1 Codes and Standards................................................................................5

2.2 Units.............................................................................................................7

3. SITE CONDITIONS................................................................................................7

4. DESIGN CONSIDERATIONS AND FABRICATION REQUIREMENTS..........8

4.1 General.......................................................................................................8

4.2 Selection of Equipment............................................................................. 9

5. TECHNICAL REQUIREMENTS (FLOW INSTRUMENTS)............................. 11

5.1 Electromagnetic Flow Meter ..................................................................11

5.2 Flow Switches............................................ .............................................14

5.3 Flow Monitors.......................................................................................... 14

5.4 Rotary Vane Type Flow Meter............................................................... 14

5.5 Consumer Water Meter Devices...............................................................16

5.6 Glass Fibre Required (GRP) Kiosk.........................................................21

5.7 Battery Powered Electromagnetic Water Meters ................................. 23

5.8 Data Logger .............................................................................................. 26

6. TECHNICAL REQUIREMENTS - PRESSURE INSTRUMENTS....................29

6.1 Pressure Gauges.....................................................................................29

6.2 Pressure Switches...................................................................................31

6.3 Pressure Transmitters............................................................................. 31

7. TECHNICAL REQUIREMENTS - LEVEL INSTRUMENTS............................ 33

7.1 Level Gauges........................................................................................... 33

7.2 Level Switches......................................................................................... 33

7.3 Level Transmitter - Ultrasonic Type......................................................34

7.4 Level Transmitter - Hydrostatic Pressure Type................................... 35

Table of Contents page

Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: document: W-l-SS-001 rev: 2 sheet: 2 |of: 4 5

[ a a d cSUPPLY DEPT. CODE Contracting Co. (L.L.C.)

Cont. Engineer

FUe No. 123632 P.O. Box: 25224 - Ahu Dhabi

8. TEMPERATURE INSTRUMENTS.....................................................................37

8.1 Temperature Gauges.............................................................................. 37

8.2 Temperature Switches............................................................................ 38

8.3 Temperature Transmitter........................................................................39

9. VIBRATION MONITORING SYSTEM................................................................42

10. INSPECTION AND TESTING............................................................................ 42

10.1 Pressure Tests......................................................................................... 42

10.2 Instrument Calibration............................................................................. 42

10.3 Cable Continuity & Insulation Resistance............................................. 43

10.4 Loop-Checking and Functional Testing.................................................43

10.5 Nameplates and Tagging........................................................................43

10.6 Labelling...................................................................................................43

11. SPARE PARTS....................................................................................................44

12. SPECIAL TOOLS AND TEST INSTRUMENTS................................................44

13. PACKING AND SHIPMENT................................................................................45

14. VENDOR DOCUMENTATION........................................................................... 45

1Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: document: W-l-SS-001 rev: 2 sheet: 3 of: 4 5

AADCSUPPLY DEPT

[contB^ineerCODE Contracting Co. (L.L.C.)

P.O. Box: 25224 - Ahu Dhabi

1.

This specification covers a wide category of field instruments typically used in Water Projects. The specification shall be read in conjunction with the Instrument Data Sheet which includes the specific requirements applicable to a project.

The CONTRACTOR shall submit the following documentations:

i) Instrument List - The CONTRACTOR shall prepare a Master Instrument Index. This list will be used to review CONTRACTOR'S progress in the selection of instruments and adherence to the Specification requirements. The list shall contain all instruments, control valves, solenoid valves and accessories, including items furnished as part of a package, such as lube oil unit instrumentation. The Instrument List will also serve a reference for ADWEA's personnel. Therefore, the list shall be complete in all respects. A new instrument list shall be issued every two months throughout the contract period.

ii) Data Sheets - The CONTRACTOR shall complete data sheets enclosed elsewhere in this contract for all instrument items. CONTRACTOR shall also furnish calibration sheets and/or calculation sheets for devices wherever applicable, for example: flow and pressure elements, control valves, safety valves, etc.

iii) Drawings - CONTRACTOR shall submit drawings, diagrams and descriptive information for all, the instruments, panel boards and miscellaneous equipment furnished under this specification with the requirements for submission of drawings set forth in the project general technical requirements.

iv) The drawings shall include, but not be limited to the following:

Outline drawings of all instruments showing dimensions, mounting provisions, cut-out dimensions, materials, electrical connections, tag numbers, mode numbers and item numbers. These drawings shall be provided for instrument and accessory furnished as part of this Standard.

Steel construction of all panels, control desk, etc.

Log sheets layouts.

GENERAL

1 Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: document: W-l-SS-001 rev: 2 sheet: 4 of: 45

AADCSUPPLY DEPT.

Cont. Engineer

File No. 123632

((*(*-0 fl oil

CODE Contracting Co. (L.L.C.)P.O. Box: 25224 - Ahu Dhabi

2.1

2. APPLICABLE STANDARDS AND CODES

CODES AND STANDARDS

The CONTRACTOR shall adhere to the Codes and Standards as applicable from Institutions and Organizations listed below. Equivalent International Standards are acceptable. CONTRACTOR shall adhere to the latest editions of all other Codes and Standards of these organizations, as they may apply.

1) International Electrotechnical Commission (IEC).

2) International Standards Organisation (ISO).

3) Instrument Society of America (ISA).

4) American National Standards Institute, Inc. (ANSI).

5) American Society for Testing and Materials (ASTM).

6) British Standard (BSI).

7) European Norme (EN).

8) Insulated Power Cable Engineering Association (IPCEA).

9) National Electrical Manufacturer's Association (NEMA).

10) National Fire Protection Association (NFPA).

11) Scientific Apparatus Manufacturer's Association (SCMA).

12) American Standard Association (ASA).

13) The Abu Dhabi Transmission and Despatch Company, metering and data exchange code.

The following list of standards indicate the requirements as minimum any other standard not listed below or elsewhere in this tender documents shall be subject to review and approve by the ADWEA/ENGINEER.

Document No.

IEC 60227

IEC 60331

IEC 60332

IEC 60770

Document Title

Polyvinyl chloride insulated cables of rated voltages

Fire resisting characteristics of electric cables

Tests on electric cables under fire conditions

Methods of evaluating the performance of transmitters for use in industrial process control systems

5= Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


j CODE Contracting Co. (L.L.C.)I RO. Box: 2 5 2 2 4 -Abu Dhabi

IEC 61000-4

IEC 60654

IEC 60584

IEC 60751

IEC 60529

IEC 60994

IEC 60625

IEC 60770

IEC 60902

IEC 60534

IEC 60839

ISO 5167

ISO 5168

ISA 5.1

ISO 3511/1

ISO 44

Electromagnetic compatibility for Industrial Process measurement & Control Equipment (Supersedes IEC 60801).

Operating conditions for Industrial Process Measurement and Control Equipment.

Part 1: Temperature, humidity and barometric pressure

Part 3: Mechanical influences

Part 4: Corrosive and erosive influences

Thermo couples

Part 1: Reference tables (584/1)

Part 2: Tolerances (584/1)

Industrial Platinum resistance thermometer sensors

Classification of degrees of protection provided by enclosures

(IP code)

Guide for field measurement of vibrations and pulsations in hydraulic machines

Interface system for programmable measuring instruments

Methods of evaluating the performance of transmitters for use in industrial process control systems

Industrial process measurement and control - Terms and definitions

CV General considerations, sizing, dim. etc.

Alarm and warning systems

Measurement of fluid flow by means of pressure differential devices

Measurement of fluid flow - Evaluation of uncertainties

Process Instrumentation terminology

Process measurement control functions and instrumentation symbolic representation

Degree of protection of enclosures

1 *5 Client ADWEA

Y j f e s rProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: documpi^V-|-SS-001 rev: 2 sheet: 6 of: 45

TT eng>o*l!tie No. 123632]

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C O D E Contracting Co. (L.L.C.)

P.O. Box: 25224-A hu Dhabi

2.2.

ISO 9001

ISO 9002

ISO 9003

ISO 7005/2

UNITS

ISO 4064/1 Measurement of water flow in closed conduits meters for cold potable water

Quality Control

Quality Control

Quality Control

Instruments Flanges

3.

The instrument ranges and scale calibration shall be in metric units according to the international system of units (SI), unless otherwise is indicated on the Instrument Data sheet, as listed below:

Flow - liquids and vapour m3/hr

gases Nm3/hr Nm3/hr

Volume m3

Pressure barHead mwcLow pressure, draught or low diff. mmWCPressure Vacuum (1) bar(Low) abs. pressure (2) mm Hg abs.

Temperature C

Conductivity micro S/cmRotating speeds rpmFrequency HzCurrents AVoltage V

SITE CONDITIONS

1. The site location of this project has a dust laden atmosphere. The temperature at night drops considerably, resulting in condensation. These conditions attack instrumentation electric terminals, contacts, etc. for which the CONTRACTOR must design protective measures. Any instrumentation not in an air conditioned atmosphere shall be supplied with waterproof, dust tight enclosures. In addition, local instrument cabinets shall also be weatherproof and equipped with space heaters.

2. It is the CONTRACTOR'S responsibility to design, furnish and install the instruments and control equipment to withstand and operate properly under the prevailing ambient conditions described in the project General Technical Requirements of this Contract.

This Specification serves as a guideline to the CONTRACTOR. The CONTRACTOR shall make recommendations and include all the necessary equipment or protecting devices based on his previous experience on similar installations.

I f *Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: |document: W-L-SS-001 rev: 2 sheet: J of: 45

Cont. EngineerFM No. 123632

( ? .? . j ) C t f j U U U j

CODE Contracting Co. (L.L.C.)P.O. Box: 2 5 224-A bu Dhabi

3. All transmitters, electric/pneumatic converters, switches and other electrical devices which provide input signals to control systems must be housed in waterproof, insulated, dust-tight and heated (as required) local instrument cabinets to protect against corrosion, humidity and condensation. Sun shades shall also be provided and designed to protect cabinets from direct rays of the sun.

4. Special precautions shall be taken in the selection of materials and the design of enclosures to prevent failure and deterioration of mechanical and electrical components due to the prevailing humidity, high temperature and very corrosive atmosphere. As a minimum, all equipment mounted in control rooms shall be suitable for operation at 45C. Field mounted equipment shall be suitable for operation upto 60C and shall be provided with sun shields.

The CONTRACTOR shall, where possible, use one instrument manufacturer of International standing for the supply of all similar instrumentation included in the Contract and shall obtain the maximum uniformity of equipment.

a. The equipment shall be constructed to operate accurately and safely under the operating conditions described or implied in this standard and the project specifications, without undue strain, wear, heating, vibration, corrosion or other operating troubles.

b. All parts shall be made accessible and capable of convenient removal. Parts subject to wear shall have adequate means of adjustment and replacement.

c. Parts subject to substantial temperature changes shall be designed and supported to permit free expansion and contraction without causing fluid leakage, harmful distortion or misalignment.

d. The CONTRACTOR shall design all the transmitters, receiving instruments and electrical control devices to have one (1) standard signal range. Analogue signals shall be one of

4 DESIGN CONSIDERATIONS AND FABRICATION REQUIREMENTS

4.1 GENERAL

four types:

1) Thermocouples-ISA Type E (chromel - constantan).

2) RTD's-100 ohm Platinum.

3) Electric Control Signals, 4 -2 0 mA.

4) Special volts, 1 -1 0 VDC (only inside control panels).

Digital signals are those used for alarms, indications, interlocks and controls.



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Digital signals shall be one of the following types.

1) Relay & transistor outputs, (OV) or (open circuit) for zero level and (+V) or (close circuit) for one level.

2) Pulse/Frequency.

a. Conservative electronic design is required. All components shall be suitable for use at less than 60% rating unless specified approval for otherwise is obtained, or if the device will not function at the low values of energy, as in the case with lights.

3) Where more than one device utilizes the same measurement or control signal, the transmitter or other signal source shall be fully equipped to provide all signal requirements. The system shall be arranged so that failure or any recorder, indicator, control component, etc. shall not open the signal loop nor cause loss or malfunction of signal to other devices using the same signal. The design shall permit removal from service of any indicating or recording device without upsetting the control systems or requiring readjustment.

4) All instrument parts (such as Bourdon tubes, pressure capsules, bellows, etc.) in contact with salt water, shall be fabricated from Monel or Alloy 20.

5) Dissimilar metals, where galvanic action may occur, shall be electrically insulated.

6) All pipe threads shall be protected by Teflon tape. (First 3 threads shall be left bare).

7) Locally mounted instruments shall be provided to indicate pressure, temperature, liquid levels, etc., where necessary for maintenance, local monitoring and control valve bypass operation.

8) Embossed or engraved I.D. tags made of Stainless Steel and clearly showing the instrument identification number shall be permanently affixed to all instruments.

4.2 SELECTION OF EQUIPMENT

During engineering, the instruments, materials and systems, shall be properly selected to provide suitable, reliable and fail safe instrumentation, requiring only a minimum of maintenance; moreover, the variety in type shall be held to a minimum. Use shall be made of exclusively new and modern materials suitable for the intended purpose. The selection of equipment shall be subject to approval of the ADWEA/ENGINEER.

Sample and documents of selected equipment shall be submitted to the ADWEA/ENGINEER.

Client ADW EA\p Project: STANDARD SPECIFICATIONS FOR W ATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: document: W -l-SS -001 rev: 2 sheet: 9 of: 45

.O. Box: 25224 - Abu Dhabi

supply DEPT-

Cont. Iitglneer

FHo No. 123632 CODE Contracting Co. (L.L.C.)

All instruments shall be suitable for continuous operation at the ambient temperatures as stated in clause (3.0).

Every precaution shall be taken in the installation of the instruments to protect them and their electronic components against the extremely harsh weather condition prevailing in the U.A.E., site location. All instruments selected shall be suitable for tropical conditions and resistant to corrosion.

The electric signals of the electronic control system shall be as mentioned in the design criteria clause (4.1 - f). The power supply for the local instruments shall be 24V DC.

Transmitters shall be suitable for field installation, and when mounted outside - shall be housed in casings to protect them against direct sun radiation and unauthorized operation.

The process and instrument connections of pressure gauge, transmitters and switches should be to NPT or BSS standards as specified in the project data sheets.

Panel mounted instruments shall be suitable for flush mounting.

Generally indicators shall have dials with white facing and bear black figures and graduations.

The selection of materials for the wetted parts of instruments, including equipment such as orifice plates, switch floats, etc. shall be compatible with the operating conditions.

The selected materials shall ensure a good measurement and be resistant to corrosion.

The material and rating of the instrument piping shall, in general, conform to the relevant piping specification. The choice of other materials shall be considered in special cases.

The process & instrument connections of pressure gauge, transmitters and switch should be to DIN or BSP standards or Vz NPT M.

Mercury-containing instruments shall not be used.

Instruments shall have suitably threaded openings to accommodate the required cable gland.

Glass cover shall be provided on membrane transmitter to avoid accidental touch to the membrane.

Instruments susceptible to ingress of water shall be of IP-68 grade of protection. All transmitters shall be installed above pump hall ground level, and shall be IP-67.

Transmitters shall be of the latest technology with setting/calibration key pad and local digital display.



AADCSUPPLY DEPT.

Cont. Engineer

Fite No. 123632CODE Contracting Co. (L.L.C.)

P.O. Box: 25224 -A hu Dhabi

5. TECHNICAL REQUIREMENTS (FLOW INSTRUMENTS)

5.1 ELECTROMAGNETIC FLOW METER

5.1.1 GENERAL

The flow meter shall comprise of a flow sensor and a transmitter unit. The flow sensor and the transmitter shall be supplied either as an integral unit or shall be remotely mounted from the flow sensor, subject to ADWEA/ENGINEER approval unless otherwise specified on the Instrument Datasheet.

The flow meter shall be of the electromagnetic type utilizing pulsed d.c. excitation and shall be microprocessor based.

The flow meter dimensions shall be in metric units. The flow meter shall be calibrated at the factory to its actual flow range in m3/hr as specified in the data sheets. A factory calibration

certificate shall be provided with the meter.

Accuracy shall be equal or better than +0.25% of reading (actual flow rate) at flow velocity >1 m/s with repeatability within +0.1% of flow rate. The measurement shall be insensitive to entrained solid particles.

The flow meter shall have on-site validation capability for sensor and transmitter. This either comes through built-in feature within the meters advanced electronics or by a dedicated field portable validator connected to the meter under test with or without cable.

The flow meter, which is specified as a settlement flow meter, shall be supplied according to Abu Dhabi Transmission and Despatch Company metering & Data exchange code (MDEC).

5.1.2 FLOW SENSOR

The flow sensor tube shall be manufactured from AISI 304, AISI 316 stainless steel or Die cast Aluminium metering with a non-conductive hard rubber or Neoprene liner to withstand process temperatures upto 60 C. The liner material shall be abrasive resistant and approved for potable water use by WRC-UK or equivalent internationally recognized authority.

There shall be 2 nos. of measuring electrodes with built in reference electrode. The reference electrode shall ensure potential equalization between the sensor and the fluid and proper grounding of the installation. Electrode material shall be SS 316L or Hastelloy.

Flow meters shall have facility to detect the empty pipe condition either by additional sensor, flow sensors or other methods I technologies subject to project specific requirements. The method shall be elaborated in material submiital for review & approval by ADWEA / Engineer.

The end connections of the flow tube shall be flanged to ISO 7005-2 PN10/PN16/PN25 as indicated in the data sheet to suit project piping specifications. The flange material shall be of stainless steel or carbon steel with Zinc I Aluminium alloy coating or other material subject to ADWEA approval.

1 = Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


P AADC!~RliPPL.y DEPTy- Cont. EngineerTpile No. 123632

CODE Contracting Co. (L.L.C.)P.O. Box: 25224 -A im Dhabi

The input impedance shall be 1015 ohms or greater so that electrode fouling does not affect signal and electrode seal integrity. The sensor data shall be stored in a built-in EPROM module.

The flow sensor shall be provided with robust powder coated Die cast Aluminium or Steel housing, certified to IP-68 of IEC 60529 for remote transmitter version only and IP-67 for integral transmitter version. The manufacturer shall provide necessary type test certificates for the enclosure. It shall be possible to validate the instrument on site without removal of the sensor for ease of fault diagnosis and maintenance.

The electrical connections for cable entry for sensors with remote transmitters shall be M20 x 1.5 with appropriate cable glands.

A minimum of ten (10) metres of interconnecting cable between sensor and the remote transmitter unit shall be included in the scope of supply of the Bidder. The interconnecting special cable shall be supplied from the manufacturer of the flow meter and the length shall be as specified in the project data sheets.

5.1.3 TRANSMITTER UNIT

The transmitter unit shall be either integral with the flow sensor or remotely mounted to suit the application requirements as indicated in the project data sheet.

The transmitter unit shall be microprocessor based, of modular design and shall be easily configurable through integral keypads. The electronics shall be of modular construction for ease of maintenance and future expandability.

The transmitter shall be provided with Alpha-numerical illuminated display for rate of flow and totalized flow indication. The data storage shall be on EEPROM to preserve data on power failure without battery backup. The unit shall have high electromagnetic compatibility according to IEC 801A/DE 0843 and NAMUR recommendations. The unit shall also withstand an Isolation Test upto 1800V for 2 sec.

The transmitter shall be housed in a robust Steel or die-cast aluminium enclosure with IP67 protection for both remote versions and the integral type.

The unit should have good resistance to shock and vibrations and withstand acceleration up to 2g/2h per day, 10-100 Hz (complete system).

The unit shall be provided with extensive self-diagnostics for operational security with resulting error messages enunciated at the alarm output.

The transmitter shall power the flow sensor with low frequency d.c. excitation to provide enhanced zero stability. Routine zeroing is not acceptable.

The unit shall be able to operate on power supplies in the range of 85V to 260V AC or 24 V DC.

All inputs and outputs shall be galvanically isolated from the power supply, the measuring circuit and each other.

1 * 5 ^ Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


P.O. Box: 25224-A hu Dhahi

AADCSUPPLY DEPT.

Cont. Engineer

Fllo No. 123632

(? (* j )

CODE Contracting Co. (L.L.C.)

The following outputs shall be available and configurable by the user:

i. Analogue, 4-20 mA signal proportional to flow rate or two independent 4-20 mA analogue signals output for settlement meters as per TRANSCO metering & data exchange code (MDEC).

ii. Active / Passive (open collector) selectable to Pulse/Frequency output.

iii. Status configurable for limit values, end value switching, empty pipe detection, flow direction over ranging or instrument fault.

The instrument should include provision for upgrading to Foundation Field bus output standard in the near future as and when applicable.

The transmitter unit shall be provided with two (2) no's, of cable glands of size M20 x 1.5 for power supply and signal cables.

The unit shall have a rangeability of 1000:1 to measure fluid velocities from 10mm/sec. to 10m/sec. with a specified accuracy.

The transmitter unit shall be suitable for operation in an ambient temperature range of 0 to 60 C.

5.1.4 FLOW METER VALIDATION UNIT

A microprocessor based portable field test unit with flow meter validation software shall be supplied on project request by the Vendor which will enable to perform Condition monitoring, calibration and verification of the status of all components of the flow meter i.e. Sensor, Transmitter and interconnecting cable including coil, electrodes, insulation, continuity, all outputs, etc. and storing this data for analysis on a PC/laptop.

The portable field test unit shall be supplied complete with leather carrying case and all leads, clips and probes necessary to perform the full range of tests. The unit shall be provided with its own power supply with re-chargeable batteries and integral charger unit.

The Electromagnetic flow meter with built-in advanced validation capability is also acceptable subject to providing the same extensive diagnostic features found with the dedicated validation unit.

5.1.5 SPOOL PIECES

For maintenance purposes spool pieces shall be provided of the same pipeline material coating/lining, each suitable for inserting into the water main in place of magnetic flow meter. The spool pieces shall match exactly the face-to-face dimensions of the flow meter. The number of the spool and requirements is project specified.


Project phase: project: |document: W-l-SS-001 rev: 2 sheet: 13 of: 45

CODE Contracting Co. (L.L.C.)P.O. Box: 25224 -A bu Dhabi

5.2 FLOW SWITCHES

Flow switches shall be of paddle or vane type with high quality snap acting hermitically sealed double pole double throw (DPDT) switch with gold plated contacts rated for 5 Amps at 240V AC.

Flow switches shall be generally used for ON-OFF signal transmission.

Housing shall be dust and weather tight protected to IP-66 (min) and materials of wetted parts shall be aluminium bronze alloy, Monel, 316L SS or similar as specified in the project data sheets.

Electrical connection shall be M20 x 1.5 with weather proof cable glands to suit the connecting cable.

Alternative types of flow switches with electronic technology may also be proposed by Contractor and shall be subject to ADWEA/ENGINEER approval.

5.3 FLOW MONITORS

Flow monitors shall be of suitable insertion type sensor, mounted in steel piping using the weld stub supplied with the flow monitor, the weld stub has a graduated scale to ensure that the stub can be correctly positioned for mounting. The installation shall be according to the manufacturer recommendation.

The weld stub shall be stainless steel 316L, for steel piping shall be A570, the housing shall be aluminium, epoxy power coated, the sensor sleeve shall be 1.4435/316L with 1.4571/316T; clamp ring.

The electrodes shall be of stainless steel 1.4435/316L.

Accuracy shall be not less than 2% at flow velocities >1m/s. Housing shall be dust and weather tight protected to IP-65 (min.)

The flow monitor shall be generally used for ON-OFF signals transmission through the internal relays; the analogue (4-20 mA) signal shall indicate the flow rate in the piping. The flow monitor shall be of electromagnetic type.

5.4 ROTARY VANE TYPE FLOW METER

5.4.1. GENERAL

The meters are to operate with potable water of maximum temperature of 50 Degrees Centigrade and working pressure up to 16 bar, however, due to occasional surges the maximum pressure may rise to 20 bar.


Project phase: project: document: W-l-SS-001 rev: 2 sheet: 14 o cn

_ AADC _ SUPPLY DEPT.

Cont. Engineer

' >j[e No. 123632

(j*.)*. j ) j .Ai


The measuring mechanism of the meter shall be of helical vane (Woltmann Type) with the axis of vane parallel to the axis of pipe. The measuring mechanism shall be removable from the meter body with the body remaining mounted in the pipeline.

The counter (register) shall be dry, and sealed against ingress of water and dust, with dehumidifying capsule to prevent condensation. The counter shall be provided with a flap (cover) to protect against mechanical damage. It should be possible to rotate the counter against the meter body into at least two different positions to facilitate read-out.

The measuring mechanism shall drive the counter by a magnetic coupling. Construction of this magnetic drive should allow for ancillary equipment (e.g. pulser) to be sandwiched between body and counter without stopping the flow or depressurizing the pipeline. The meter shall be preequipped for installation of a pulse transmitter or encoder at a later date.

The read-out unit shall comprise of one centre sweep pointer and at least seven (7) digits counter with four (4) black figures (left hand set) and three (3) red figures (right hand set). Meters shall be calibrated to read in cubic metres.

All wetted body parts shall be made of materials resistant to corrosion caused by water from flash distillation desalination plant. The body shall be made of cast or ductile iron (spheroid graphite iron, nodular iron) and the measuring mechanism of stainless steel and high-grade plastics.

The body of the meter shall be of robust construction with the ability to withstand rough handling, and shall allow for free standing in horizontal position. The meter shall be adequately protected against hostile environment i.e. relative humidity upto 100% with condensation, ambient temperature upto 50 Degrees Centigrade, dust and sand, salt in air and with occasional flooding by saline water. The body of the meter shall be externally coated with epoxy paint to 300 microns.

It shall be possible to install the meter in any position without detrimental effect upon the meter performance.

Each flow meter shall be subject to pressure and leakage test of 1.5 times the nominal pressure before leaving the manufacturers works.

Each meter shall be accompanied by a manufacturers test certificate.

The meter shall be provided with flanged end connections. The flanged connection shall be drilled according to ISO 7005-2, PN 16 unless specified otherwise in the data sheets.

The flow meter shall have an accuracy better than (+2%), in compliance with the latest ISO standards.

5.4.2 TYPE OF CONSTRUCTION

Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKS

r 5 5

Title: SPECIFICATION FOR FIELD INSTRUMENTATION


[ a a d c[ supply d e p tt Cont. Eoflinoer

-Ite No. 1236321

((*(*-0 < \S jmCODE Contracting Co. (L.L.C.)

P.O. Box: 25224 - Ahu Dhabi

All definitions for flow shall apply as per ISO 4064/1 Clause 3.

Nominal flow rates should at least meet the requirements of ISO 4064/1 Table 2.

The accuracy of the meter and its meteorological characteristics should at least meet the requirements of Class B, ISO 4064/1 Table 5. Preference will be given to the meters that present better accuracy and better meteorological characteristics than those required by the standard. Typical Type Test Certificates from internationally recognised meteorological institute shall be provided by the Vendor.

Each meter shall have a manufacturers guarantee certificate giving date of manufacture, specification, quality control approval (in accordance with ISO 9000) and a three (3) years warranty from the date of supply.

5.5 CONSUMER WATER METER DEVICES

5.5.1. GENERAL

The following is the general specification for advanced non-moving parts, static class C, state of the art microprocessor controlled consumer potable water meter for the distribution companies exclusively.

This shall cover meters of the following sizes:

1) 15 mm - 1.5 m3/hr.2) 20 mm - 2.5 m3/hr.3) 25 mm - 3.5 m3/hr.4) 40 mm - 10 m3/hr.

The meters shall be designed and constructed for use with potable water and shall have capability of allowing particles up to 2.5 mm in diameter to pass through. The meter ingress protection degree shall be according to IP-68.

The flow measuring shall be based on ultrasonic, electromagnetic or fluidic oscillation technology. The meters shall be powered by a built-in battery with minimum operating life of 10 years at the rated environmental temperature.

The meter shall allow 100% overflow and designed for a PN16. The pressure loss shall be less than 1 Bar (including the non return valve and the strainer).

The meter shall be tamperproof and not to read any measurements of air.

5.4.3 PERFORMANCE



AADCSUPPLY DEPT.

Cont. Engineer

Fite No. 123632

( . f . f . i ) a S j j Zj


5.5.3.

5.5.4.

5.5.4.1

BODY CONSTRUCTION

The meter body shall be compact, made from brass or other approved modern engineering material. The material shall be approved by WRC-UK or equivalent internationally recognized authority, a certificate of which shall be submitted for approval.

The water meter shall be supplied with high quality brass union type (cap and lining) tailpieces all threaded on major pipe connections and are to be BSP.

The water meter shall be suitable for fixing in any orientation (vertical, horizontal or inclined) without loss of accuracy.

A Non-return valve shall be fitted at the outlet end of the meter. Also a Strainer shall be fitted at the inlet end of the meter for stopping particulars greater than 2.5 mm in diameter.

Active part of the meter shall be factory sealed. It shall not be possible to open the meter or replace the battery without irreparable damage of the tamperproof seals.

SERVICE CONDITIONS

All materials and electronic parts shall be designed in accordance with relative international standards for use under the service conditions prevailing at the site. The service conditions shall be considered as minimum design values.

Ambient Temperatures : 60 CMean in the year : 35 CMinimum Temperature : 0 CAtmospheric conditions: humid, saline, corrosive.

GENERAL DESIGN

MAIN FEATURES

Following are the minimum requirements for the meters. Manufacturer shall propose possible advantages, additional features and better performance capability for any.

Microprocessor controlled, nonmoving parts measurement of potable water.

Metrology shall be based on either ultrasonic, Electromagnetic or Fluidic oscillation technology.

Accuracy - Class 2 to OIML R49 (Class C to ISO 4064)

Working pressure 16 bar.

Digital data output for Remote reading applications.

Provided with Alphanumerical LCD for different readouts.

Volume measure shall be in cubic meter (m3) and flow rate in (m3/h).

Time stamped events logging.

Meter body shall be Brass to BS EN 12165 or BS EN 12263 or other advanced engineering material subject to approval.

ADWEASTANDARD SPECIFICATIONS FOR WATER WORKSSPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: document: W-l-SS-001_____rev: 2 |sheet: 17 of: 4 5

C O D E Contracting Co. (L.L.C.)

P.O. Box: 25224 - Abu Dhabi

Battery powered with operating life not less than 10 years.

Ingress Protection IP-68 and tamperproof.

5.5.4.2. ALPHA NUMERICAL DISPLAY REQUIREMENTS

The meter shall have an alphanumerical liquid crystal display (LCD) for multi display purpose.

Digits of display shall be 7 mm minimum height, and be legible in normal daylight conditions from a distance of two meters by an observer.

The meter display shall show but not limited to the following:

Flow rate in m3/h.Accumulated volume m3.Serial number of the meter Reverse flow Customer number Battery condition Tamper detection Reverse flowMeter condition (status check).

5.5.4.3. LOCAL COMMUNICATION PORT/TERMINAL

The Meter shall have a port/terminal for local communication through optical head or induction coupler or any other non contact means. This communication port/terminal shall be compliant to IEC 61107 requirements.

Optical head/terminal will ensure connection with HHU (Hand Held Unit) or Laptop/PC. In this regards, for optical head meters shall have a magnetic ring on the port so that optical head can stands on it without affecting the proper operation of the meter.

5.5.4.4. REMOTE COMMUNICATION

The Meter shall have Remote Communication facility through the provision of a cable and socket and plug to connect to data retrieval device to monitor readings through an Automated Meter Reading (AMR) system. Other methods of data transfer are also accepted subject to approval. An open Protocol Architecture is to be provided for the AMR.

The meter shall be able to communicate at any time (with or without the need to add any other component) on a remote basis all stored data through any of communication technologies (PLC, RF, GSM, GPRS ...). End user shall specify the type of communication required per batch of meters.

The meter shall be provided with a built-in event recorder for recording important events and occurrences of not less than 99 time stamped events. These logs shall include such happenings as leakage, law battery, malfunctioning, tampering, etc.

Client ADWEAL Project: STANDARD SPECIFICATIONS FOR WATER WORKS


Project phase: project: document: W-l-SS-001 |rev: 2 |sheet: 18 |of: 4 5

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CODE Contracting Co. (L.L.C.) jP.O. Box: 25224 -A bu Dhabi i

5.5.5 NAMEPLATE

The nameplate shall be written on the meter in such a manner as to prevent removal.Meter number shall also be stored in the non-volatile memory and shall be part of the data available to AMR system. Each meter shall bear the following information on the nameplate:

The End User official LOGO (to be provided).

Manufacturer's name, year & country of manufacture.

Designation of type.

Property of Abu Dhabi Distribution Company o r Al Ain Distribution Company label.

Serial number (also in barcode format) the serial number shall be in the following

format XXOODOOOOOO

XX for the shorthand of meter brand name.

00 for the year of manufacture.

D for ADDC or AADC

000000 for a sequential serial number

Unit of measure ( m3 )

Direction of flow

Q3 value.

Maximum admissible pressure (map)

Maximum admissible temperature (mat)

Pressure loss (AP).

The Manufacturer shall submit the nameplate drawing for approval.

5.5.6 CALIBRATION CERTIFICATE

Each meter shall be accompanied by manufacturer's certificate, which has traceability to an international laboratory that would be proposed by the manufacturer and approved by End user. Each meter shall be attached with a calibration date stamp including the validity period. Meters shall preferably have prescribed recertification (Validity) period not less than 10 years approved by authorized body.

5.5.7 SOFTWARE AND MANUALS

Software for meter parameterisation and remote reading shall support all standard protocols and inter connectable with other equipment. This shall be supplied by the meter manufacturer, along with operation manual of the meter and the software. The manufacturer shall also provide training on the use of software.The meter reading software shall provide the data at the receiving end (PC) compatible with the current major database software.A detailed manual of the software and its functions shall be provided as a part of the tender.

1 ^ . Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKS

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Project phase: project: |document: W-l-SS-001 rev: 2 sheet: 19 of: 4 5

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CODE Contracting Co. (L.L.C.)P.O. Box: 25224-A bu Dhabi

5.5.8 TEST

5.5.8.1. METER TEST

Each meter shall be subject to routine tests in accordance with OLML R49 and shall be sealed. A test certificate shall be submitted in hard and soft copies. The manufacturers seal shall be taken as proof that the meter has been tested and conforms to the specification.

5.5.8.2. TYPE TEST

Test certificates, duly approved by an independent authority of international repute as evidence of successful completion of type tests described in OLML R49, shall be submitted as part of the Tender.

5.5.8.3. FACTORY ACCEPTANCE TEST

Within one month from the date of award of contract, the Supplier shall submit for approval a test and inspection plan to be conducted at the factory. The costs of factory tests shall be borne by the Contractor.

No approval of tests or inspection shall relieve the Contractor of his responsibility to complete the supply according to the specifications.

A test reports, from fully computerised meter test bench system for carrying out acceptance tests with error values and curves for each and every meter of the test sample, shall be provided.

5.5.9 TRAINING

The training is for metering technical staff. Manufacturer shall provide all training materials required. The venue shall be selected by the end user Training module shall comprise:

description of the meter parameterisationmeter management / reading software AMR communications set up Accuracy check fault diagnosis

5.5.10 DOCUMENTATION AND TECHNICAL MANUALS

The supplier shall submit the Operation and Maintenance instructions describing in English Language the correct manner of operation and maintenance of the meters provided under this Contract with special references to any recently developed features.

Documentation and technical manuals shall be submitted to end user two weeks before the Completion of supply.

Documentation and user technical manual shall contain the following documentation:

Description of the operation of the meter Instructions for meter configuration and maintenance Complete circuit diagram Component lay-out drawings


Project phase: project: document: W-l-SS-001 rev: 2 sheet: 2 0 of: 4 5

CODE Contracting Co. (L.L.C.)P.O. Box: 25224 - Abu Dhabi

The meters shall be packed properly so that no damage is sustained due to transportation and rough handling during shipment.All cases shall bear at least the identification mark relating to the appropriate shipping documents, the contents and total weight.

Each case or package shall contain a packing list in a waterproof envelope. All items shall be clearly marked for easy identification against the packing list.Packing list shall include meter serial numbers, and should be provided as both soft and hard copies.The identification mark shall consist of the following information in sequence and in frame commensurate with the size of package:

(a) Consignee: ADDC/AADC

(b) Contract nam e: Supply o f .........................................

5.5.11 PACKING

(c) Contract N o .:

(d) Destination:

(e) Item No., if applicable, package number in sequence and quantity per package :

(f) Description of contents :

(g) Net and gross weight, cubic measurement:

5.5.12. WARRANTY

5.5.12.1. METER WARRANTY

The meters warranty period shall be 66 months (5 years in operation plus 6 month in storage)

5.5.12.2. BATTERY WARRANTY

The supplier shall guarantee the battery of the proposed meter for 10 years under specified environment conditions and operation.

5.6 G.R.P. KIOSK

The GRP kiosk shall be fixed to a reinforced concrete base and be divided into two separate water proof compartments. Each compartment shall have its own door, door handle and lock. It shall be possible to gain access to either compartment without disturbing the other compartment. One compartment shall house all cabling and instrumentation equipment, while the other compartment shall house a sampling tap and sink mounted on an integral backboard.



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CODE Contracting Co. (L.L.C.)P.O. Box:2 5 224-A bu DJiabi

The inbuilt pressure transducer of the data logger shall be connected with the hose/impulse tube that is tapped from the sampling line that feeds the sample tap, the line shall also have an isolation valve. The signal cable from the dry side shall be connected to the data logger, the cable entry shall be through the separation wall between the dry and wet side. The cable entry shall be sealed using water resistant sealant.

The drain from the sink shall comprise a 20 mm OD HDPE pipe that shall pass through the concrete base of the kiosk and terminate in a 0.05 m3 soakaway situated at least 1 m from the kiosk. The soakaway shall comprise gravel wrapped in geotextile and be buried with a minimum cover of 0.3 m.

The GRP material shall be from high quality grade of polyester resin reinforced with chopped matt glass fibre with approved UV stabilized gel coat suitable for UAE climate conditions. The kiosk walls shall be of GRP/12 mm ply board/GRP encapsulated construction. The doors shall be GRP/12 mm ply board/GRP encapsulated construction. The ply board used shall be weather and boil proof to BS 1203. The door shall be fitted with flat gasket to ensure insulation and prevent water ingress into the kiosk. The GRP material shall have impact strength of 40 - 50 KJ/m2 to ISO 179-82 and mechanical strength of 80 MPA to ISO/R 527-E6.

The GRP kiosk construction shall be to a minimum of IP 65 with fire retardant to BS 476 - Part 7 Class 2. The Kiosk construction shall be such that a thermal insulation of 2.0 to 3.0 W/m2 oC is achieved. The colour of the GRP kiosk shall be RAL (7032)

All the hardware such as hinges, hooks, nuts and bolts, door handle and lock shall be of stainless steel grade 304, as shall be of the sampling tap, sink and integral backboard. Each lock shall have two (2) keys.

The kiosk shall have small-toughened glass windows for meter readings and its orientation shall be to the north to minimize direct sunlight.

The kiosk shall have 2 openings in each compartment, one high level and one low level to allow for ventilation and drainage. Each shall be internally covered with a fine stainless steel grade 304 mesh. The openings shall be designed to prevent dust from entering inside the kiosk. The kiosk shall have full rain canopy.

The kiosk shall be fitted out to house battery powered flow transmitter with external battery. The kiosk shall be with set of MCBs rack as required with 20% spares and terminal block rack as required with 20% spare. The kiosk shall also house space for the future equipment as shown in the Tender Drawing.

All cables entering the kiosk shall be armoured and installed using suitable glands. Earthing shall be provided for all equipments to be installed in the GRP kiosk. Aluminium back plates for mounting the instruments shall be provided.

1 5 = = ^ Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


CODE Contracting Co. (L.L.C.)P.O. Box: 25224-A hu Dhabi

The Contractor, while planning for the equipment layout, shall guarantee the following: -

1. Provide adequate space for ease of maintenance and proper heat dissipation/ ventilation.

2. Wire trunking shall be neatly laid in a way not to cross over the equipment and shall be as far as possible to the edge side of the kiosk. All trunking shall be totally covered.

3. Kiosks shall have earth bar.

5.7 BATTERY POWERED ELECTROMAGNETIC FLOW METER

5.7.1. GENERAL

The meters shall be used for the sector/Bulk consumer measuring requirement for distribution companies exclusively.

The water meter shall comprise a flow sensor and a transmitter unit. The flow sensor and the transmitter shall be supplied either as an integral unit or shall be remotely mounted from the flow sensor, subject to ADWEA/ENGINEER approval unless otherwise specified in the Instrument Datasheet.

The water meter shall be of the electromagnetic type utilizing pulsed d.c. excitation and shall be microprocessor based.

The water meter dimensions shall be in metric units. Each water meter shall be calibrated at the factory at a minimum of 3 points between the minimum and permanent flow rates as defined by OIML R-49. A factory calibration certificate shall be provided with each meter.

5.7.2. FLOW SENSOR

The flow sensor tube shall be manufactured from AISI 304, AISI 316 stainless steel or Die cast Aluminium metering with a non-conductive liner. The liner material shall be abrasive resistant and approved for potable water use by WRC-UK or equivalent internationally recognized authority.

There shall be 2 nos. measuring electrodes. Unless the manufacturer can demonstrate that they are not required, there shall be electrodes or rings which shall ensure potential equalization between the sensor and the fluid and proper grounding of the installation. The electrode or ring material shall be SS 316L or Hastelloy.

Water meters shall have an Empty Pipe Detection (EPD) facility.

The end connections of the flow tube shall be flanged to ISO 7005-2 PN10/PN16/PN25 as indicated in the data sheet to suit project piping specifications. The flange material shall be of stainless steel or carbon steel with either a epoxy or zinc / aluminium coating.



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CODE Contracting Co. (L.L.C.) P.O. Box: 25224 -A b o Dhabi

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The input impedance shall be 1014 ohms or greater so that electrode fouling does not affect signal and electrode seal integrity. The sensor data shall be stored in a built-in EPROM module.

The flow sensor shall be provided with robust powder coated housing, certified to IP-68 of IEC 60529. The manufacturer shall provide necessary type test certificates for the enclosure.

It shall be possible to validate the instrument parameters on site without removal of the sensor for ease of fault diagnosis and maintenance.

The electrical connections for cable entry for sensors with remote transmitters shall be M20 x 1.5 with appropriate cable glands.

A minimum of ten (10) metres of interconnecting cable between sensor and the remote transmitter unit shall be included in the scope of supply of the Bidder. The interconnecting special cable shall be supplied from the manufacturer of the water meter and the length shall be as specified in the project data sheets.

5.7.3. TRANSMITTER UNIT

The transmitter unit shall be either integral with the flow sensor or remotely mounted to suit the application requirements as indicated in the project data sheet.

The transmitter unit shall be microprocessor based, of modular design and shall be easily configurable through integral keypads or through suitable handheld terminal with modern interface method. The transmitter shall be provided with Alpha-numerical illuminated display for rate of flow and totalized flow indication. Should only one value be able to be displayed at a time the unit shall have a key for scrolling through the information. The data storage shall be on EEPROM to preserve data on power failure without battery backup. The unit shall have high electromagnetic compatibility according to IEC 801A/DE.

The transmitter shall be housed in a robust steel or die-cast aluminium enclosure with IP68 protection, though IP67 protection shall be acceptable for the remote type of units housed in a cubicle above ground. The unit shall be shock and vibration resistant.

The transmitter shall power the flow sensor with low frequency D.C. excitation to provide enhanced zero stability.

The unit shall be powered by an external field replaceable battery with a minimum of 5 years battery life based on 50 ms sampling period and 15 second sampling frequency at ambient temperatures of up to 50C. The sample period and frequency shall be fully programmable such that they can be easily configured by the operator. The shelf life of the battery must be at least 10 years at a ambient temperatures of up to 30C.

The water meter shall incorporate a battery management system that shall provide to information on the current status of the battery. The system shall provide a battery replacement window of at least 12 months to ensure that there is no interruption to flow measurement.



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CODE Contracting Co. (L.L.C.) *P.O. Box: 25224-A bu Dhabi

If specifically called for in the project data sheet an external powered meter with battery back up can also be supplied. The water meter shall be able to operate on D.C. power supply in the range of 12V to 48 V DC with a back up battery that can power the meter for a period of at least 12 months in the event of power outages.

All inputs and outputs shall be galvanically isolated from the power supply, the measuring circuit and each other.

The outputs shall be available and configurable by the user. They shall comprise 2 pulse outputs, one of which shall be configurable as an alarm output, together with a communication port for meter configuration and data download.

The transmitter unit shall be provided with sockets or cable glands of size M20 x 1.5 for power supply and signal cables.

The accuracy of the meter shall comply with the requirements of OIML R49, accuracy class 1, with a low flow rate (Q1) which shall equate to a flow velocity in the meter of not higher than 0.1 m/s. The completed data sheet and supporting documentation shall clearly list the accuracy class and minimum flow rate (Q1) for each size of meter. The performance shall be certified by an independent international certification agency and the measurement shall be insensitive to entrained solid particles.

The transmitter shall be suitable for operation in an ambient temperature range of 0 to 60 C.

5.7.4 WATER METER DIAGNOSTICS AND VALIDATION

The unit shall be provided with extensive diagnostics for operational security with resulting error messages enunciated at the alarm output.

The operator shall be able to monitor and validate the meter parameters using either an external field test unit or through integral software and hardware. The process shall verify the condition and status of the major system components.

It shall be possible to connect an external unit to the transmitter through an integrated infrared communication interface ports and download all the relevant data.

If a portable field test unit is required it shall be supplied complete with carrying case and all ancillaries necessary to perform the full range of tests. The unit shall be provided with its own power supply with re-chargeable batteries and a charger unit.

5.7.5 SPOOL PIECES

For maintenance purposes spool pieces shall be provided of the same pipeline material with a suitable coating and lining, each suitable for inserting into the water main in place of magnetic water meter. The spool pieces shall match exactly the face-to-face dimensions of the water meter. The number of the spool pieces of different sizes shall be project specific.



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CODE Contracting Co. (L.L.C.)I.(). Box: 25224 -A bu Dhabi

5.8.1 GENERAL

The data logger shall be of compact, rugged, outdoor, battery operated and GSM enabled capable of operating continuously in harsh environmental conditions.

The Data logger will be able to log and record the flow signals, pressure and Alarms and to transmit such data using GSM communication.

The data logger shall have the capability to operate with long life battery for at least 5 years

5.8.2 CODES AND STANDARDS

The vendor shall adhere to the codes and standards as applicable from Institutions and organisations listed below. Equivalent International Standards are applicable. Vendor shall adhere to the latest editions of all other codes and standards of this organisation, as they may apply.

IEC 60654 Operating conditions for Industrial Process measurement and Control Equipment.

Part 1: Temperature, humidity and barometric pressure

Part 2: Mechanical Influence

Part 3: Corrosive and Erosive Influences

IEC 60529 Classification of degrees of protection provided by enclosures (IP code)

IEC 60625 Interface systems for programmable measuring Instruments

CE European Directives on Electromagnetic Compatibility

BS 5515, Section 2 Code of Practice for Documentation of computer based systems

5.8.3 INPUTS

The data logger shall be supplied as a standard with at least three inputs, including minimum one channel for the flow consumption and one for alarm and the inbuilt pressure sensor.

The data logger input circuitry shall be capable of accepting flow signals, open collector signals from electronic meters. The data logger shall also be able to accept switch closures or logic pulses.

5.8.4. SAMPLING RATE

The data logger shall have fast sampling rate. Sampling rate settings shall be configured different for different channels. The sampling rate of the data logger shall be at least 1 second.

The logging interval of the data logger shall be configurable from 1 second to 15 minutes

5.8 DATA LOGGER


Project phase: project: |document: W-l-SS-001 rev: 2 sheet: 26 of: 4 5

5.8.5. MEMORY

The memory of the data logger shall be non-volatile or battery backed so that data is not lost as a result of main battery replacement. The memory capacity shall be expandable.

The memory of the data logger shall be sufficient for storing approximately two months of data recorded at a 15-minute interval from one channel also considering the Alarm and event that could occur.

5.8.6. ALARMS

The data logger shall include real time features such as monitors and alarms. In addition to sending data at a selected frequency and time, the data logger shall be able to transmit information if alarm condition occurs.

The data logger will transmit the alarm which are configurable, the following but not limited, alarm shall available

Low Battery Alarm for Battery powered Flow meter

Low Battery Alarm for Data logger

Low and High Flow

Low and High Pressure

Forward/Reverse Flow status

5.8.7. INTERNAL CLOCK

The data logger shall contain 24-hour real time clock with date facility. The accuracy of the data logger internal clock shall be better than one minute at all times. This can be achieved by the electronics of the data logger or by synchronising its clock using the GSM network

5.8.8. FUNCTIONAL SPECIFICATION

The data logger shall feature the facility for a number of specific information and project requirement to be programmed. The data logger shall be able to record flow/consumption profile using pulse count recording.

Project specific information to be programmed into the logger shall include but not limited to:

Project and Data centre detail.

Scale factors and offsets for each input

Units and formats for measurements

Channels and memory to be allocated for each channel

Alarm and event configuration

Frequency of data transmission

Frequency of data logging



5.8.9. BATTERY

The data logger shall have internal battery and the battery shall be field replaceable in a workshop without having to be returned to the manufacturer.

The unit shall be powered by field replaceable internal battery with a minimum of 5 years battery life at a 15 minute logging interval and transmission of data once daily at ambient temperatures of up to 50C. The shelf life of the battery must be at least 10 years at an ambient temperature of up to 30C.

If specifically called in the project specification, mains powered data logger can also be supplied. The shelf life of the back up battery must be at least 10 years at an ambient temperature of up to30C.

5.8.10. GSM

The data logger shall have the GSM communication facility. The GSM modem shall be internal and the GSM antenna shall be integral to the data logger. If required, the unit shall also have the option to connect to an external antenna.

The data logger shall incorporate a GSM modem for the purpose of transmitting and receiving data to and from the network. The GSM modem shall be capable of transmitting and receiving instructions from a central data server using the short message services (SMS) or general packet radio service (GPRS)

The GSM modem shall be capable of operating at frequencies of 900 MHZ and 1800 MHZ and compatible with the GSM service providers in United Arab Emirate (ETISALAT and DU)

The data logger shall permit the replacement of the SIM card by the user. It shall support all current forms of SIM cards in common use by GSM operators in United Arab Emirate (ETISALAT and DU)

The data logger can be programmed to initiate data transmission hourly, daily, or weekly at a user-selected time. In the event that the networks reject the SMS or GPRS connection, the data logger will proceed through a retry algorithm.

5.8.11. COMMUNICATION PORT

The data from the data logger shall be retrieved by download data via an RS 232 or with a Universal Serial Bus or with an Ethernet link to a Laptop PC, PDA or any other link.

5.8.12. HAND HELD DEVICE

Portable Hand held data collection unit shall be provided for downloading the data from the data logger and download it to the PC/Laptop available in the data centre.

The data collection unit shall be supplied with power supply with recharchable batteries and integral charger. The unit shall also have the required communication port and cable with connector (USB / Infrared / serial port) compatible with the data logger and the central data centre system.

i s Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


5.8.13. CONFIGURATION DEVICE

Portable Hand held programming unit shall be provided for configuration and settings of input output channels, configuring alarm and event. The data collection unit shall be supplied with power supply with researchable batteries and integral charger.

5.8.14. SOFTWARE

The data loggers shall be able to communicate with PC to store and analysis data.

The data logger analysis software shall be provided free of cost and should provide trending facility and report generating facility. Retrieved data from the data loggers shall be translated to Microsoft Excel schedule and graph showing recorded data time and date.

5.8.15. PHYSICAL PROPERTIES

The data loggers shall be of compact, rugged, outdoor and battery operated instrument capable of operating continuously in harsh environmental conditions.

The data logger shall be completely waterproof, sealed and pressure tested (IP 68) and battery powered and requires no maintenance for at least five years.

The SIM card should be field replaceable.

The data logger shall be able to attach to a panel or bolt onto a chasis or rack mounted and fit inside enclosures. All the fitting and mounting accessories shall be provided with the set.

The data logger shall be able to withstand an ambient temperature of 0C to 60C.

6. TECHNICAL REQUIREMENTS - PRESSURE INSTRUMENTS

6.1 PRESSURE GAUGES

6.1.1. GENERAL

The gauges shall be circular dial industrial type and of the safety pattern design.

The pressure gauges shall be of 'BOURDON TUBE type with concentric scale in accordance with BS 1780 and additional requirements specified below.

6.1.2. CASE

The gauges shall be suitable for direct mounting.

The nominal size shall be 150 mm.

The range shall be as per data sheet. While selecting the maximum range it should be ensured that the normal operating pressure is at approximately 60% of the range.



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CODE Contracting Co. (L.L.C.) ). ,U ) ' Huv: 25224 - Ahu D habi I

The case material including blow-out plate shall be stainless steel. A full blow-out device shall be fitted to the back of the pressure gauge case, to prevent the pressure in the gauge from exceeding 0.3 bar g (30KPa) in case of tube rupture.

The blow-out back plate shall be provided with a flexible compensation facility and sealing ring, both made of a hydrocarbon resistant synthetic rubber.

The window shall be of shatterproof glass.

The case shall be suitable for liquid filling according to IEC-60529, IP-65 protection.

The case shall be glycerine (glycerol) filled if the pressure gauge installation is susceptible to vibration.

6.1.3 PRESSURE SENSING ELEMENT

The pressure sensing element shall be of minimum AISI 316 SS Bourdon tube welded to AISI 316 shank and tube end piece. Both welds shall be full argon-arc welds (TIG wildings) and shall be made with the use of AISI consumables. The Bourdon tube shall be placed at least 7 mm inside the shank.

6.1.4 CONNECTION

The gauges shall have a bottom connection as specified. Connection size shall preferably be 1/ 2

inch NPT (M).

6.1.5. POINTER MOVEMENT

The movement shall be of corrosion and wear-resisting material e.g. stainless steel.

6.1.6. POINTER AND DIAL

A stainless steel flexible pointer stop on the dial shall be provided.

6.1.7. SAFETY FACTOR

Pressure containing parts shall be designed with a safety factor of 4 to 1.

6.1.8. ACCURACY

Accuracy of the gauge shall be better than +1 % of f.s.d.

1 % Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: |document: W-l-SS-001 rev: 2 sheet: 30 of: 45

CODE C o n tra c t in g Co. (L.L.C.)P.O. Box: 2 5 2 2 4 - A b u Dhabi

Each gauge shall be supplied with a gauge cock and a sample cock which shall be fitted between the gauge and the discharge pipe according to the approved primary connection diagram. Also a pulsation damper / snubbers shall be supplied with each gauge if mounted in highly pulsating process.

6.2 PRESSURE SWITCHES

The pressure-sensing element may be of the Bourbon tube, spiral, helical, bellows or diaphragm type, depending upon the application requirements. The pressure sensing element shall be of AISI 316 SS. Pressure switches shall withstand the maximum pressure of the system to which it is connected. In addition, over range protection, (at least 1.3 times the maximum scale reading), shall be included for all instruments. Gauge protectors shall be included wherever required to withstand maximum surge pressure. The Vendor shall indicate the proof pressure for the quoted model in his offer.

Set point for pressure switches shall be adjustable throughout the operating range.

Pressure switches shall have V2" NPT (F) process connection.

Pressure switches generally be used for "ON-OFF" applications with an adjustable set point and a differential gap with a reference or calibrated scale. The switch type shall be snap action DPDT, rated for 5 amps at 240V AC or 1 amp at 30V d.c. The switch shall also be hermetically sealed with gold plated contacts. Degree of protection shall be NEMA type 4X, IP-65 or better.

6.3 PRESSURE TRANSMITTERS

Pressure transmitters shall be of the direct sensing type with the sensing element as per manufacturer's standard. The diaphragm shall be hermetically welded to the measuring element assembly, which shall be suitable for the operating temperature limits of 0 to 60 C unless

otherwise specified.

The transmitter shall be of a smart type with modular design and capacitive sensor. The measuring element shall be able to withstand a temporary/permanent overpressure to at least 33% of the specified range limits without calibration shift.

All wetted parts and the diaphragm shall be compatible with the process fluid and shall be of minimum AISI 316 or ceramic. The measuring assembly fill fluid shall be silicon oil, unless otherwise specified and non-toxic certificate shall be provided for filling fluid. Alternatively dry capacitance sensor shall also be acceptable.

PTTE gaskets shall be applied as a standard, unless otherwise specified. The bolts and nuts shall be high tensile stainless steel ASTM A564 - T630 - H1150 unless otherwise specified.

The transmitter enclosure class shall be according to IP-67 of IEC 60529, as a minimum.

6.1.9. ACCESSORIES

| 5S>... Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


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I Contracting Co. (L.L.C.)LO. Box: 25224 - Abu Dhabi

The process connection shall be V2" NPT (M) and the electrical signal cable entry connection

shall be M20 x 1.5 metric, unless otherwise specified in the data sheet. Unused electrical connections shall be plugged off with a recessed head screw in compliance with the specified electrical safety requirements. The screw material shall be of stainless steel for stainless steel enclosures. The signal cable termination points shall of the screw type.

The transmitter output signal shall be 4-20 mA with hart protocol as specified in the data sheets.

The transmitter power supply voltage shall be 24 VDC, for two-wire transmission system with a minimum power supply voltage of 12.5 VDC.

The transmitter electronics shall be microprocessor based. Printed circuit board(s) should be of replaceable modular construction, shall be hermetically sealed or protected by a corrosion- resistant coating (tropicalized) and vibration-free supported in case of plug-in type circuit boards.

Signal wiring terminals and electronics shall be housed in separate compartments, so that the electronics remained sealed during electrical connection of the transmitter to the signal cable.

The electronics system shall be provided with a reverse polarity protection circuit.

Zero and span shall be non-interacting, easily and continuously accessible. The external adjustment(s) should be provided with an environmental protection cover. It shall be possible to calibrate the transmitter locally through dedicated push buttons for zero and span with digital accuracy.

The transmitter shall be provided with integral digital indicator with scale identical to the calibrated range as indicated in the instrument data sheet.

The performance of the transmitter shall be as follows:

The transmitter accuracy including combined effect of linearity, hysteresis and repeatability shall be equal to or better than 0.1% of calibrated span.

The dead band shall be equal to or better than 0.05% of span.

Stability (not including temperature or pressure effect) shall be better than 0.1% of the minimum span per 30 days or 0.2% of URL for one year.

The total dynamic effect of the temperature including span and zero error:

At maximum span - equal or less than 1.5% of the span

At minimum span - equal or less than 4.5% of the span, unless otherwise specified.

The total effect of the radio frequency interference's shall be equal or less than 0.1% of the output span, with the transmitter enclosure cover in place. The transmitter shall be provided with EMI/RFI integral transient protection also when the cover has been removed. The protection level shall be as per NAMUR recommendations and EMC directive compliance.

| 5^.. Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


CODE Contracting Co. (L.L.C.) j25224 - A!)U Uhabi j

6.3.1 ACCESSORIES

One no. of hand held portable configurator shall be included in the scope of supply of the vendor as an optional item if specified.

7. TECHNICAL REQUIREMENTS - LEVEL INSTRUMENTS

7.1 LEVEL GAUGES

Local level gauges for the surge vessels and reservoirs shall be of the direct reading magnetic type where a permanent magnet mounted in a float drives a series of flaps. A small permanent magnet shall be attached to each flap to ensure that the flaps remain in a given position even when severe vibration occurs. The float shall be concentric magnetic design with unsupported sections to provide a strong and uniform magnetic field. The external mounted float guiding tube / chamber shall be of 304 SS and the float shall be AISI 316 SS. The housing of the flaps shall be dust and watertight. A graduated scale made of stainless steel with 1 cm division shall be fixed adjacent to the float guiding tube/chamber.

Only one (1) level gauge shall preferably be used on a vessel. If, however, two (2) or more level gauges are required, they shall be installed in such a way that the visible lengths overlap by at least 100 mm.

The level gauges can be fitted with field adjustable snap acting micro switches for high and low level alarms. The alarm contacts shall be gold plated and rated for 5 amps at 240 V AC. The switch enclosure shall be weather proof to NEMA-4 or IP-65. Electrical connections shall be M20 x 1.5 with cable glands.

7.2 LEVEL SWITCHES

Level switches shall be Ultrasonic type, float or displacer operated and shall have high quality snap-acting double pole double throw micro switch type.

Level switches shall be of packless construction; there shall be minimum moving parts in the liquid. The float and sleeve shall be made of 316 SS and mounted inside a flanged external cage / float chamber. The float chamber shall be provided with side / side flanged connection of size 2 inch ANSI 150 lbs RF.

Alternatively horizontal float type magnetic switches will be considered according to the service conditions.

Housings shall be weatherproof to IP-67. Body materials shall be aluminium bronze alloy. Wetted parts shall be 316 SS / Monel or similar approved.

The switching element shall be hermetically sealed snap acting micro switch rated for 5 amps at 240 V AC with gold plated contacts. Each switch shall be provided with DPDT contact arrangements. The switch enclosure shall be weather proof to IP-67 of IEC 60529. Cable entry shall be M20 x 1.5.

i : Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION

Project phase: project: document: W-l-SS-001 rev: 2 sheet: 3 3 of: 45

7.3 LEVEL TRANSMITTER - ULTRASONIC TYPE

The level sensor shall operate on the Ultrasonic principle. The unit shall comprise of a sensor and a field mounted Transmitter unit, interconnecting cable and accessories such as sensor flanges, mounting frame, alignment unit and protective cover as required for a complete installation.

7.3.1 SENSOR

The sensor shall be suitable for a measuring range as per the process data sheet.

The probe shall be provided with a built-in temperature sensor for the compensation of sound velocity.

The sensor shall be flange mounted on top of the storage tank and supplied with a mounting flange or threaded. For easy mounting and accurate positioning of the sensor an alignment unit shall also be supplied, if required by the application (i.e. when process connection is threaded).

The sensor housing shall be of polypropylene (PP) and shall be certified to IP-68 enclosure class.

The sensor shall operate satisfactorily under ambient and operating temperature limits of 0 C to 60 C, a relative humidity of 0 to 100% RH. and maximum operating pressure of 2 Bars (absolute).

The following accessories shall be supplied with the sensor unit:-

i. All weather Protective Cover

ii. Interconnecting cable between the censor and transmitter, (as required by the application). The cable shall be supplied from the manufacturer of the instrument.

7.3.2 TRANSMITTER

The transmitter unit shall be of single channel version suitable for field mounting compatible with the Ultrasonic Level Sensor on the storage tanks.

The unit shall be microprocessor based and of modular construction. The operation shall be based on intelligent software using fuzzy logic for echo analysis and rejection of sporadic reflections, interference echoes and multiple reflections.

The transmitter enclosure shall be certified to IP-67 of IEC-60529.

The unit shall be provided with a keypad on the front panel to be used for configuration purposes together with an illuminated LCD display and bar graph segment display for level in steps of 10% or better.

Configurations shall be carried out by the use of standard operating matrix and the time required for starting minimized by the use of pre-set operating parameter values. Data storage shall be in EEPROM non-volatile memory to avoid requirement of battery back up. A keypad locking facility to prevent unauthorised access to program changes shall be provided.

1 *3Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


7.4

7.4.1

7.4.2

7.4.3

The unit shall be suitable for operation in a temperature range of 0 to 60 C with 95% average RH.

The transmitter shall provide a 4-20 mA analogue signal output, linearly proportional to the level in the tank, and three (3) independent SPDT relay outputs, each with one potential free changeover contact. The output shall be programmable through the keypad and the input, outputs and power supply shall be electrically isolated from one another. One fault alarm contact shall also be provided with LED indication.

The unit shall operate on a power supply of 24 V DC or 240 V AC.

The measuring uncertainty shall be within 0.2% for maximum measuring span.

A 2 inch mounting post of galvanized steel along with mounting screws and nuts and an aluminium all-weather cover for the protective housing shall be supplied with each transmitter.

LEVEL TRANSMITTER - HYDROSTATIC PRESSURE TYPE

GENERAL

The transmitter shall comprise a hydrostatic pressure sensor suitable either for mounting on a flanged connection located in the water reservoir or for insertion through a borehole into water well by means of a connecting cable. This specification is based on the latter application, which requires the most stringent features. The flanged type shall generally follow the same specification except for the enclosure class that may be relaxed to IP-67.

DESIGN FEATURES

The hydrostatic pressure sensor shall comprise a measuring cell mounted in a stainless steel probe tube fitted with a stainless steel diaphragm. The diaphragm shall be protected by a fine mesh metal grid and a protective cover. The probe tube shall be filled with silicon oil which shall transmit the hydrostatic pressure of the liquid column to deflect a silicon diaphragm with a thin film strain gauge. CONTRACTOR shall provide non-toxic certificate for the filling fluid. Variations in pressure on the surface of the liquid shall be compensated by an air tube passing through the connecting cable to the other side of the silicon diaphragm. The transducer should have an over pressure rating of at least 4 times nominal pressure. A durable conical cable sealing shall be fitted on the probe tube with a moisture barrier on the pressure compensation line for long term stability. In case of failure the sensing module shall be replaceable.

MATERIALS

(i)

(ii)(iii)

(iv)

Sensor Tube

Diaphragm

Gasket

Cable

AISI 316L Stainless Steel

AISI 304 Stainless Steel

Viton

Polyethylene insulated and bound with steel webbing

1 1Client ADWEAProject: STANDARD SPECIFICATIONS FOR WATER WORKSTitle: SPECIFICATION FOR FIELD INSTRUMENTATION


syppCLS-

CODE Contracting Co. (L.L.C )J W - B o x : 2 5 2 2 4 - a bu Dhabi

7.4.4

7.4.5

7.4.6

7.4.7

7.4.8

7.4.9

MOUNTING

The probe and cable shall be mounted by galvanised steel pressed clamps cable holder including connection box or a housing with a 1.5 inch (nominal) threaded connection. The diameter of the sensor shall be less than 30 mm to facilitate easy insertion and withdrawal from the guide tube.

ENCLOSURE CLASS

The cable probe shall be certified for IP-68 and housing/connection box to a mini, of IP-65.

The probe shall be suitable for operation up to a process temperature of 60 C.

ELECTRONIC MODULE

The electronics shall be microprocessor based and completely potted with compound to protect them from moisture damage. The unit shall provide a 4-20mA two wire signal output linearly proportional to level change. The 24V DC power supply shall be provided by the connected RTU of the system SCADA. The change in output shall be insignificant for terminal voltage variations from 12 to 30 V DC and for a load resistance of 0 to 800 ohms. The sensor shall be provided with integral over-voltage protection of at least 10 kV to prevent short transient voltage peaks from damaging the electronics unit. The unit shall have an electromagnetic compatibility of 10 V/m. Zero and span adjustment shall be possible digitally through push buttons on the enclosure.

MEASURING RANGE

The unit shall have a measuring range as specified in the data sheet.

PERFORMANCE REQUIREMENTS

Accuracy :

Repeatability :

Hysteresis :

Minimum Overpressure resistance :

0.25% of full scale (sum total of linearity,

(hysteresis and repeatability).

0.1% of full scale

0.1% of full scale

10 times

INSTALLATION ACCESSORIES

Two (2) inch diameter (nominal) stilling well or guide pipe.


Project phase: project: documeQt=.v

A-6310 Spec for Field Instrumentation

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Transcript of A-6310 Spec for Field Instrumentation