Sample Detaild Design Practice

MANUAL No. REV.

0

SHEET 1 / 27

This document is of a confidential nature and is the property of JGC CORPORATION, TOKYO, JAPAN, and shall not

be traced, photographed, Photostatted or reproduced in any manner, nor used for any purpose whatsoever except by

written permission of JGC CORPORATION.

REV. DATE PAGE DESCRIPTION PREPD CHKD APPD

ALL FIRST ISSUE

JDM 1378 G 0008

JGC DESIGN MANUAL

0

DETAILED DESIGN PRACTICE

FOR

Layout of Inst. Main Cable Way

Layout of Inst. Main Cable

Plot Plan of Field Instrument

Layout of Inst. Wring, Piping and Tubing

Layout of Inst. Impulse Line

JDM 1378 G 0008 2/27

The design practices attached as sample hereto are specifically prepared for the past project.

Purpose of those documents is to define the project requirements for designers.

In addition to Design for Instrumentation Work : JDM-1378-S-0001, they can be used as for project design engineering

documents incorporating project requirements.

0799S-00-1378-501.doc FORM 799-1

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FIELD

PROJECT SPECIFICATION


FOR

LAYOUT OF INSTRUMENT MAIN CABLE WAY

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1 GENERAL

1.1 Layout of instrument main cable way shall be prepared in accordance with planning of instrument main cable way,

but engineer shall develop these layout drawings with plot plan of field instruments/equipment and instrument loop

diagrams. To decide the ways at the early engineering stage is essential due to avoid interference with electrical

cable ways, equipment foundations, etc. So that, designer shall be paid an attention to estimate the cable quantity.

Finally, routing of cable, dimension of way, etc. shall be adjusted or suited to overlapping layout of U/G facilities

drawing. These drawings shall show the underground/overhead routing of main cable way, size/type of way and

methods of supporting cable way, also applicable construction details, a bill of material and notes for the

installation, care shall be taken.

2 PLAN DRAWING

2.1 Detailed Design Practice for Instrument Cable Way

2.1.1 The routing cable way shall be such that the instrument cables have the shortest possible length.

2.1.2 Cable segregation in trenches, refer to Para. 2.1.10 and 2.1.11 S-00-1378-502.

2.1.3 The cable tray or duct shall not obstruct traffic and not interfere with the accessibility or removal of

process equipment (pump, motors, heat exchanger bundles, etc).

2.1.4 The cable tray or duct shall be routed away from hot environments, places with potential fire risks such as

hydrocarbon process pumps, burner fronts on furnaces and boilers, or where they would be subject to

mechanical obtuse, spilled liquids, escaping vapors and corrosive gases. For design basis and philosophy

of fireproofing for instrumentation, refer to PS 250-1378-103.

2.1.5 In particular, the cable tray or duct for instrument electronic signal lines shall be routed away from high

voltage cable (See S-00-1378-502).

2.1.6 The cable tray or duct shall be safely and easily accessible for maintenance purposes.

2.1.7 To avoid unnecessary bend, the space required for cable tray and duct shall be reserved in the plant

structure, pipe racks, etc. in an early engineering stage.

2.1.8 For instrument cables, the width (and depth) of the trenches shall be selected for properly accommodating

the required number of cables, including their segregation space.

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2.1.9 The curvature of the corners in trenches, cable tray or duct shall be compatible with the permissible

bending radius of armored cables.

2.1.10 The cable tray or duct shall be firmly supported, and wherever possible the supports shall be arranged in

such a way that cables can be laid into the cable tray or duct from the side of the run, instead of pulling

them through consecutive holes. The free space over the cable tray or duct shall be at least 0.40 m.

2.1.11 To prevent stresses of the instrument cables, they shall be suitably fixed in the cable tray or duct, especially

in the vertical cable tray and duct.

2.1.12 The trenches shall also be kept away from buried pipes containing hot fluids and from pipes liable to

temperature rise due to steaming-out, etc. A distance of at least 0.30 m between cable and pipe (including

insulation) shall be maintained. If close crossing with underground pipe carrying hot liquids or gases

cannot be avoided, the pipe shall be insulated to limit its outside temperature to maximum of 60C cables

should preferably cross underneath buried pipelines.

2.1.13 The trenches shall have such a depth that the instrument cables are not damaged by traffic passing over

them.

2.2 Routing of Cable Way

2.2.1 Scale 1/100 in general, back ground drawings from the plot plan to be provided.

2.2.2 Required number of main cables to be estimated from instrument loop diagrams and plot plan of field

instruments/equipment.

2.2.3 Each cable way to be sized in accordance with above cable quantity including 30% future spare space.

2.2.4 Drafting on back ground drawings, show approximately location, type/size, weight, support type,

elevation and cable quantity for checking purpose.

2.2.5 Draft drawing showing cable way with necessary information shall be coordinated with piping, civil and

electrical section.

2.2.6 Layout drawing to be reflected in item 2.2.5 and show exact location, type/size, support and elevation for

field construction.

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2.2.7 Design of miscellaneous minor brackets may be left to field.

2.2.8 The way for the redundant data-hiway cables for the system shall completely segregated and/or separated.

Prior to the layout, designer shall contact with D.C.S engineer to confirm the detail philosophy.

2.2.9 The cable ways to be routed in the existing areas shall be deemed examined by field engineering and be

agreed with Pertamina engineer.

2.2.10 When the test excavation is required wherever in the existing area shall be discussed.

3 APPLICABLE DOCUMENTS AND DRAWINGS

3.1 Instrument Loop Diagrams

3.2 Specification of Instrument Cable

3.3 Plot Plan of Field Instrument

3.4 Plot Plan of Plant

3.5 P & Ids

3.6 Check sheet of Layout of Instrument Main Cables

3.7 Typical Installation Method for Instrumentation

3.8 General Description of Instrument Installation Drawings

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DISTN

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FIELD

JGC

FIELD



FOR

LAYOUT OF INSTRUMENT MAIN CABLE

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1. GENERAL

1.1 Layout of instrument main cable shall be prepared in accordance with instrument loop diagrams, plot plan of

field instruments/equipment, layout of instrument main cable way and specification for instrument cables.

These drawings shall show the aboveground and underground routing of all instrument cables from their

termination points (junction boxes or instruments) in the plant to their termination points (marshaling cabinet

and etc.) in the control room, complete with the laying pattern for cable segregation.

2. PLAN DRAWING

2.1 Detailed Design Practice for Instrument Cables

2.1.1 Minimum 15 percent of the signal lines in the installed multiple cables shall still be available as spares for

future modifications.

2.1.2 Multiple cable for individual signal lines shall be used from the control room to the plant. Each cable shall

be terminated in a junction box, which shall be located as close as possible to the group of instrument it

serves.

2.1.3 After leaving the ground, double tape armored cables shall be installed on perforated angle or on perforated

trays, see drawing No. D-00-1378-001-E (Typical Installation Method for Instrumentation).

2.1.4 The service of the wires in each multiple cable shall be so arranged that in the plant the length of individual

signal lines is as short as possible.

2.1.5 Electronic instrument signal cables and 110 (or 120) V AC instrument power supply cables, 125 (110) V DC

safe guarding system cables can be laid in the same trays if steel plate separator should be made between

them.

2.1.6 PVC sleeves to be installed between trench and cable rising point in special areas unless otherwise

approved. See drawing No. D-00-1378-001-E (Typical Installation Method for Instrumentation).

2.1.7 The maximum allowable voltage drop shall be observed for instrument power cables (within 5%).

2.1.8 All cables and junction boxes shall be numbered in accordance with Dwg. No. D-00-1378-101-A (General

Description of Instrument Installation Drawings).

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2.1.9 Cables in the paved areas shall be buried in performed concrete (concrete block type wall) trench and cables

in an unpaved areas shall directly be buried.

The fireproofing by glass wool or equivalent will be applied to multicore main cables exposed from the

ground to the junction boxes and cables installed on the cable trays located on or close to high fire risk area,

such as pumps handling hydrocarbon of which temperature is higher than the auto ignition point. (Refer to

S-00-1378-103 Design Basis for Fireproofing (Instrumentation))

2.1.10

(1) Multicore cables shall be used between the control room and field junction boxes, unless specially required.

Separate multicore cables are required for:

(a) Analogue signals (DC 24 V)

(b) Thermocouple signals

(c) Control and status signals (shutdown circuits)

(d) Intrinsically safe circuit signals

(e) Resistance thermometers signals (RTD)

(f) Inst. power supply

(2) One continuous length cable (direct cable) shall be used between field instrument to control room, for

following signals:

(a) PD meters (pulse)

(b) Turbine metes (pulse)

(c) Motor operated valve

(d) 4-20 mA signals associated to emergency shutdown system

(e) Computer bus signal

(f) Other special signals

(3) Data-hiway cable between termination points shall be continuous length.

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2.1.11 Cables Segregation in Trenches

The following minimum spacing shall be maintained between cables of Zone A and B, according to

definitions below, if parallel runs cannot be avoided.

LocationMinimum Separation

between Zone A and B

Process units 300 mm

Utility units 300 mm

oil handing facilities(Offsite area)

600 mm

Zone A:

(a) I nst r ument power suppl y cabl es up t o 120 V AC wi t h a 10 A r at i ng

( b) Act uat i ng l ogi c syst ems, i ncl udi ng sol enoi ds, annunci at or s ( 125 V DC)

Zone B:

( a) Syst em bus si gnal s

( b) Thermocoupl es and r esi st ance t emperat ur e measurement

( c) Anal yzer si gnal s

( d) El ect r oni c si gnal s ( 4-20 mA)

( e) Turbi ne met er and P/D met er s ( pul se t r ai n)

( f ) Tank gaugi ng syst em, vi br at i on proxi mi t or s

( g) Dat a l i nks

Not es:

( 1) Where a crossover between cabl es of Zone A and B i s an unavoi dabl e, t he cabl es

shoul d be ar r anged t o cross at r i ght angl es.

( 2) Wi t hi n zone B, syst em bus si gnal cabl es shoul d be l ai d on si de r emot e f r om

Zone A cabl es, so t hat cabl es ar e i nst al l ed f ar f r om i nst r ument power suppl y

cabl es.

( 3) Separ at i on between t r enches of el ect r i cal cabl es ( f or power and l i ght i ng)

and t r ench f or i nst r ument cabl es ( cabl es of Zone A and B) shal l be normal l y

0. 6 m. Thi s separ at i on shal l be 2. 0 m i n case of 20 KV power cabl es and l ong

par al l el r un. Cross-over wi t h el ect r i cal cabl es shal l be at r i ght angl es.

The di st ance t o be adhered shal l be 0. 3 m mi ni mum.

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( 4) Syst em bus f or mast er and bus f or sl ave shal l be r out ed t hrough separ at e

t r enches as f ar as pr act i cal .

2.1.12 The cables shall be laid with sufficient slack (especially at rising points) to prevent stress, in particular where

trenches are made in soft poil.

2.1.13 Cable manufacturers specifications shall be adhered to for the minimum bending radius, for trenching

design, especially fiber-optic cables and armored cables.

2.1.14 Where trenches for instrument cables pass below electric trenches, protective PVC pipes (6 inch) shall be

provided for future cable laying.

2.2 Routing of Instrument Main Cables

2.2.1 Scale 1/100 in general, back ground drawing from the plot plan to be provided.

2.2.2 Locate junction boxes at center of group of instrument as per plot plan of field instrument/equipment.

2.2.3 Main cables to be selected as per specification for instrument cables and item 2.1 of detail design practice for

instrument main cables.

2.2.4 Assign numbers to main cables and junction boxes.

2.2.5 Each drawing shall bear listings of main cables. Each listing shall show junction box No. or tag No., cable

No. and cable code also location and elevation for junction box, local panel and necessary instrument to be

shown.

2.3 Existing spare cables shall be utilized as much as possible.

3. APPLICABLE DOCUMENTS AND DRAWINGS


3.2 Plot Plan of Field Instruments

3.3 Layout of Instrument Main Cable Way

3.4 Check Sheet of Layout of Instrument Main Cables

3.5 P & ID



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PLOT PLAN OF FIELD INSTRUMENTS

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1. GENERAL

Plot plan of field instruments shall be prepared in accordance with piping layout drawings, piping and instrument

diagrams, instrument loop diagrams and the instruction described hereto.

In addition to, the following documents shall also be referred for design:

- Instruments/equipment data sheets or specifications

- Equipment or plant plot plans

- Vendors instruments/equipment drawings, specifications or instruction manuals

- General Description of Instrument Installation Drawings

- Typical installation method for instrumentation

- Piping Layout Drawings

2. INSTRUMENTS/EQUIPMENT TO BE SHOWN

As a rule, all instruments/equipment to be installed, wired, piped, tube, etc. by instrumentation work at site shall be

shown on the drawings.

3. INSTRUMENT TAG NO. AND TYPE

Tag No. and type shall be read from piping and instrument diagrams, and relevant data sheets.

4. ITEMS TO BE CONSIDERED

4.1 The following description is a guidance to decide the instrument locations. The exact location to install the

instruments at construction site will be finalized with customer, then installed.

4.2 Locations of inline instruments and sensing elements such as control valves, temperature elements, orifice

flanges/plats, displacement flow meter, displacement level instrument, all pressure taps, etc. have been

decided and shown on the piping layout drawings following the mechanical and process requirements per the

P & Ids, instrument information, etc. however instrument engineer is requested to check (or review) whether

their location is most adequate or suitable for the requirements and if any discrepancy or outstanding items

arise, it should be discussed with the associated engineer to solve the problems.

The location of off line instruments shall be decided by instrument engineering following the points described

below:

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4.2.1 Operability/Maintenancebility

(1) Locate the instruments/equipment and always have a maintenance space.

As a rule, pedestal mount (ground or platform) shall be applied for pressure, d/p pressure,

temperature transmitters, etc. unless noted, and (a) location of indicators, hand switches, buttons

shall be followed the instruction noted on the P & Ids or relevant instrument data sheets, etc.

(a) All flow control valves as shown on P & I dia. Will have remote output indicator which

should be located near associated control valves where must be readable from the bypass

valve. If indicator on the transmitter can be readable from the bypass valve, remote indicator

is not required.

(b) All instrument location and elevation shall be indicated on the drawing.

(c) To have good operability, the following manner shall generally be considered:

- Locate hand switches, push buttons etc., as suite where

Safety location: i.e., fire station, shut down switches, etc. at grade

Can be watched the equipment condition at grade.

- Locate local controllers such as FIC, LIC, TIC, PIC and HC near final actuating devices

and at grade.

- Locate draft gauges near furnace stack damper operator at grade.

- Locate I/P transducers near associated final actuators when the transducers are not

mounted on the actuators at shop and within 10 ft a way.

- Locate P/I transducers within 10 ft a way from related signal transmitters.

- Instructions to be issued separately for special instruments/equipment such as analyzers,

tank gauges, turbine meters pre-amplifiers, radioactive instruments, etc. shall be reflected

on the drawings.

- All instruments shall always be faced to operator access or maintenance accesses.

- Transmitter locations shall always be as follows unless noted;

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Instrument Service Location of Instr.

Gas service Instr. Is installed at a higher

elevation than press. Taps.

- Diff. Press. Type

flow instr.

- Press instr. Normal liquid and

steam service

Instr. Is installed at a lower

elevation than press. Taps.

- Diff. Press. Type

level instr.

Normal liquid

service

Instr. Is installed at the same

elevation as lower tapping, or

below.

- Note that temperature transmitters shall be located as suite separately from the elements.

4.2.2 Signal Responsse

- Pneumatic controller shall not be located for from over 100 meters from transmitters.

I/P or P/I transducer --- See Para. 4.2.1.

4.2.3 Instruments shall not be located where:

(1) Vibration is expected.

eq. Rotary equipment foundations, near furnace burners, compressor or heavy duty pump spill

back lines.

(2) Heat radiation (over 60C) is expected.

eq. Fired heater wall, hot equipment, hot pipe lines.

(3) Movement, expansion are expected.

eq. Reactor, high temp. service, steam pipe lines if installed on such equipment and the lines,

flexible tubing, piping, etc. shall be considered.

(4) Removable objects

eq. Cable trench, pipe trench, man way, etc.

(5) Maintenance space for the equipment or access for operator.

(6) Areas where normally operator can not access.

eq. Dangerous area near radioactive sources etc..

(7) Very near or front of valve handles, motor starter, sampling point, steam traps, doors, etc.

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4.2.4 Electronic instruments shall be located areas where defined as Div. 2 on the elect. Area classification

drawings as much as possible.

If the instruments can not be located in Div. 2 area design group shall inform the tag No. to engineering

group to discuss.

4.2.5 Instruments/equipment shall be located where easy for piping, tubing and wiring.

4.2.6 The location of instruments, equipment to be piped, tube, wired for the packaged equipment shall be referred

to vendors drawings.

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LAYOUT OF INSTRUMENT WIRING, PIPING AND TUBING

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1. GENERAL

1.1 Layout of instrument wiring, piping and tubing shall be prepared in accordance with instrument loop

diagrams, plot plan of field instruments and main cable layout.

The drawings shall show the location of:

- All plant-mounted instruments, equipment excluding local pressure gauge, temperature gauge, etc. (no

wiring, piping and tubing instrument).

- All local panels and analyzers.

- All plant-mounted junction boxes for instrument signal cabling.

- Perforated tray/angle between junction boxes and plant instruments, equipment.

- All instrument air supply piping from its demarcation points with piping engineering to the relevant

(groups of) consumers isolating valves, branch-off points and pipe size shall be clearly indicated.

- Pneumatic signal lines between instruments.

- Fireproofing of cables.

2. PLAN DRAWING

2.1 Detail Design Practice for Instrument Wiring, Piping and Tubing

2.1.1 All instrument cables shall apply with the following specification.

(1) Electronic signal cables

For aboveground single pair and multipair cables, PEi-AMS-STA-PVCS as detailed in Para.

2.2.1 of S-00-1378-102.

For underground single pair and multipair cables, XLPEi-AMS-PES-STA-XLHDPES as

detailed in Para. 2.2.1 of S-00-1378-102.

(2) Interlock/alarm/power cables

For aboveground multicore cables, PEi-PES-STA-PVCS as detailed in Para. 3.2.1 of S-00-

1378-102.

For underground multicore cables, XLPEi-PES-STA-XLHDEPS as detailed in Para. 3.2.1 of

S-00-1378-102.

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(3) Resistance thermometer cables

For inside building cables, PEi-AMS(IND.)-PVCS as detailed in Para. 4.2.3 of S-00-1378-

102.

For above/underground cables, XLPEi-AMS-PES-STA-XLHDEPS as detailed in Para. 4.2.1

of S-00-1378-102.

(4) Thermocouple extension cables

For aboveground single and multipair extension cables, PEi-AMS-PVCS-STA-PVCS as

detailed in Para. 5.2.1 of S-00-1378-102.

For underground single and multipair extension cables, XLPEi-AMS-PES-STA-XLHDPEI

as detailed in Para. 5.2.1 of S-00-1378-102.

(5) Wire size and type shall be in accordance with following:

Analogue, digital signal, control & status and thermocouple extension cables shall be stranded

wire and AWG 16. The cable size for power supply to the instrument equipment shall be

AWG 14 copper wire as a minimum. However, cables shall be sized taking into account

consumption, cable length and equipment manufacturers requirement. Maximum allowable

voltage drop shall be within 5%.

2.1.2 After leaving the junction box, armoured signal cables shall be run in performed angle or tray, and

shall be connected to the measuring element by means of cable gland, see drawing No. D-00-

1378-001-E (Typical Installation Method for Instrumentation).

2.1.3 Regarding quantity of cables to be accommodated in each size of perforated angle/tray, see drawing

No. D-00-1378-001-E (Typical Installation Method for Instrumentation).

2.1.4 The size of the air piping shall depend on the number of air pilots as follows:

Number of Pilots Size

1 - 4 1/2

5 - 10 3/4

11 - 25 1

26 - 80 1-1/2

81 - 150 2

151 - 300 3

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2.1.5 The final air supply connection to individual air filter regulator, instruments, equipment shall be of

copper tubing same as pneumatic signal tubing. PVC shrouds shall be installed at connection

points.

2.1.6 Spare valve and plugged connections shall be provided on the main instrument air header.

2.1.7 Main branch header valves shall be as per piping specification, and individual isolating valves near

instruments shall be of bronze or brass.

2.1.8 Pneumatic signal tubing shall be of 1/4 OD PVC sheathed copper tube with double ferrule

compression type fitting of brass.

PVC shrouds shall be provided at connection points.

2.1.9 Tubing shall be run in the perforated cable tray or along instrument air supply piping.

2.1.10 The perforated angle

2.1.11 Flexible metal hose connector for air lines to be used when absorption of thermal expansion should

be considered.

2.1.12 Special attention shall be paid to the interconnection of cable screens in such a way that the

screening is earthed only at the intended location, and that multiple earthing does not occur.

2.2 Routing of Instrument Wiring, Piping and Tubing

2.2.1 Scale of the drawings are 1/50 ~ 1/100 depend upon the No. of instrument to be covered, but 1/50

scale is preferred.

2.2.2 Redrawn the background drawings from the related plot plan.

2.2.3 Location

Instruments : Replot from plot plan of field instrument/equipment

Junction boxes : Replot from layout of instrument main cables

2.2.4 Selection of perforated angle and tray route to be considered as follows

(1) Length of perforated angle and tray is as short as possible.

(2) Perforated angle and tray support can be easily installed refer to piping layout and

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structure drawings.

(3) Accessible for cabling and maintenance purposes.

2.2.5 Selection of air piping, tubing route to be considered as follows:

(1) Same as item (1) and (2) of 2.2.3

(2) Pocket piping to be avoided, as much as possible

(3) At least 15% spare 1/2 valved connections shall be provided evenly distributed through

the plant.

2.2.6 Listing shall show, in sequence of tag number, the (plant) coordinates for the location of the

equipment and its elevation above plant grade level.

Where instrumentation in structures in involved, consideration should be given to the preparation

of layout drawings for different levels, e.g. for each platform, and/or drawings showing such

structures in side-view (elevation) with all the above information.

2.2.7 Tie-in point, location and method within the existing areas shall be designed by field survey. Their

method, etc shall be agreed with Pertamina engineer.

3. APPLICABLE DOCUMENTS AND DRAWINGS


3.2 Plot Plan of Field Instruments

3.3 Layout of Instrument Main Cables

3.4 Layout of Instrument Cable Way

3.5 Specification for Instrument Cables


3.7 Specification for Instrument Installation Materials


3.9 Check Sheet of Layout of Instrument Wiring, Piping and Tubing

3.10 Vendors drawing


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INSTRUMENT IMPULSE LINES

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1. GENERAL

1.1 Instrument impulse lines shall be prepared in accordance with instrument project specification, instrument

pressure piping material specification, typical standard for instrument pressure piping hook-up and the

instruction described hereto. In addition to, the following documents shall also be referred for design:

- General specification for instrumentation

- General specification for instrument manifold valves

- Detail dimensions for typical piping

- Instrument process connections and split of work between instrument and other disciplines

- Material code for instrumentation work

- Instrument protection method

- Vendors drawings

- P & I Ds

2. GENERAL INSTRUCTION

2.1 The pressure lead piping and/or tubing shall have a minimum number of fittings and bends and be

continuously sloped at approximately 1 per foot minimum. If the pressure lead raises above the pressure

connection and the instrument, the rate of slope from the high point of the lead towards the pressure

connection and the instrument shall be the minimum previously stated. Long single pressure leads, used

only when absolutely necessary, may be run horizontally, as in a yard, but without pockets. Instruments may

be located above or below the pressure connection depending upon the requirements of visibility and

accessibility from the controlling pints. Due to consideration must also be given to the fluid medium being

measured, the use of sealing, purge, bleed or flushing fluids and vacuum service in determining the best

possible installation.

2.2 In general, pressure instruments in liquid, steam, condensable vapor service and those sealed, purged, or

bled or flushed with liquid shall be installed below the pressure connection and those in air, non-condensable

gas, vacuum service or using air or gas purge or bleeds shall be installed above the pressure connection.

2.3 Since the extent of the pressure leads as previously described depends on the location of the instrument, the

following terms and descriptions are used to establish the location of the instrument in relation to the

pressure leads.

(1) Line mount

Line mounting shall be applied only when specifically designated.

Instrument installed near the line, vessel or equipment connection, at the same operating level, with

the connection block valve readily accessible.

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(2) Remote

Remote mounting is general method for this project.

(a) Instrument installed at the same operating level but away from the line, vessel or

equipment pressure connection block valve which cannot be reached quickly and

conveniently, or a t different operating level than that of the pressure connection block

valve.

(b) For this type of installation, an additional block valve shall be installed at the instrument.

2.4 All pressure instrument installations shall have a bleed off valve installed between the pressure connection

block valve and the instrument to permit depressuring so that if necessary the instrument may be safely

disconnected during operation. The bleed off valve shall be installed close to the instrument, and when the

instrument is located below the pressure connection or below the high point of the pressure lead, the valve

shall be installed to serve both as a bleed off and as a brain.

2.5 When pressure connections are common to two or more instruments, additional block and bleed-off valves

or bleed-off drain valves shall be installed at each instrument, regardless of its location with respect to the

pressure connection block valve at the line, vessel or equipment.

2.6 When pressure instruments are sealed, a sealing tee shall be used for instruments with elastic pressure

elements (Bourdon tubes), small bellows or diaphragms that have no appreciable displacement. A seal pot

shall be used for instruments with large bellows or diaphragms, liquid cambers, etc., that have appreciable

displacement and for back pressure or pressure reducing diaphragm control valves (PCV) with external pilot

lines. The sealing pot or sealing tee will be installed at the high pint of the pressure lead. The distance from

the sealing tee or seal pot to the pressure connection block valve shall be the absolute minimum required. A

valve shall be installed in the sealing tee or seal pot to be used for depressuring, venting and filling. An

additional block valve shall be installed at the instrument if required. To prevent inadvertently draining of

the sealing liquid, no bleed-off or drain valve shall be provided but instead a plugged valve shall be installed.

Note: The temperature limitations of the PTFE tapes recommended for NPT threaded connections are

-100 and +200C.

2.7 For instruments which are remotely located from the instrument process connection, the impulse lines shall

be so arranged that any movement, e.g. thermal expansion, will not exert an excessive force on any

connection. Instrument impulse lines which are subject to excessive movement shall be provided with

expansion loops.

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2.8 Instrument connected to process pipes which vibrate heavily shall be installed on independent supports with

the impulse lines arranged so as to be sufficiently flexible, in order to take yp the vibration and to prevent the

lines from vibrating at resonance frequency.

3. SPECIFICATION

3.1 All impulse lines from the process connection to the instruments shall be designed based on the following

criteria:

(1) Codes J01 impulse lines to be applied for tubing style.

Codes impulse lines to be applied for piping style and moreover codes should be made up

piping for following services:

- Chloride service

- Sour service

- Liquid above their auto ignition temperature

(2) The sizes of impulse lines, when is indicated in the P & ID, shall be followed as per Licensers

specific requirement.

3.2 Drain and/or vent facilities shall be provided as required for the proper operation.

3.3 The impulse tubing or piping shall generally be arranged as follows:

- For liquids, the instrument shall be mounted lower than the measuring point, to ensure automatic

venting of any gas from the instrument and connecting pipe back into the process line. The tap

direction of flow element shall be horizontal.

- For gases, the instrument shall be mounted higher than the measuring point, to ensure automatic

draining of any liquid from the instrument and connecting pipe back into the process line. The tap

direction of flow element shall be vertical.

- For steam, the instrument shall be mounted lower than the measuring point. For low displacement

instrument, e.g. force-balance type, fitting tees are preferably installed without condensing pots,

however fitting tees may be omitted for saturated steam. The tap direction of flow element shall be

horizontal.

- The flow element shall be located in a horizontal pipe. Otherwise it shall be installed in a vertical

pipe with downward flow for liquid, gas and steam.

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3.4 Heating, Sealing and Purging

(1) Where plugging of impulse lines due to solidification of fluids, etc., can occur, suitable protection

shall be provided by means of heating, sealing or purging.

(2) Where the tracing of the impulse tubing or piping shall be required, steam tracing shall be provided.

(3) Process fluids which solidify at ambient temperature shall not be allowed to enter the instrument, and

instrumentation in such services shall be protected by liquid seals, or liquid or gas purges.

(4) Diaphragm seals shall be considered for corrosive applications for which no suitable sealing liquid

can be selected.

(5) Specification of instrument protection method (IP-250-1378-506) shall be applied for design.

4. SPECIAL APPLICATIONS

4.1 Services where shown in P & I Ds, provide two transmitters piped form one orifice flange for liquid, steam

or condensable vapor service. One transmitter shall be piped to one set of horizontal orifice taps and the

second transmitter shall be piped to the other set of horizontal orifice taps. The second transmitter shall be

used only for the low flow shutdown system.

4.2 Services where shown in P & I Ds, provide two transmitters piped from one orifice flange for dry gas service

shall have individual isolation. The second transmitter shall be used only for the low flow shutdown system.

4.3 Double isolate/vent block (contamination of process stream is not permitted) to be applied on differential

pressure level instrument.

4.4 Bubble pipe assemblies for purging control hook-up shall be designed as per instrument data sheet.

4.5 Manifold for PDI (such as mechanical type) to be marked with pipe or tube and valves in field.

4.6 For differential-pressure level measurement on atmospheric vessel, a 2-valve isolate/vent block shall be

used.

4.7 Instrument with a low (negligible) displacement (e.g. force balance type) to be sealed by fitting tees with

venting connection are preferable applied without seal pot.

Instrument with appreciable displacement (e.g. bellows type flow meters) required seal pots with special

impulse line arrangement for control of the seal liquid level in order to prevent hydrostatic error.

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4.8 Codes heat treatment is required in accordance with ANSI B 31.3. But codes can be replaced by stainless

steel class if the pressure-temperature rating are acceptable, avoiding consequently the heat treatment.

4.9 The cold bending for piping style shall be done if the required angle is not suitable for elbow fitting. The

bending radius shall not be less than 5 times the outside diameter.

4.10 Impulse piping shall be joined by compression fittings, socket welding flanges or by screwed connections

depending upon the typical standard for instrument pressure piping hook-up.

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