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Partitioning and Outfitting Works for Mozambique Country Office HVAC Detailed Project – Technical Specifications Rev. 00 31 October 2016 Submetido por: HaskoningDHV, Lda Maputo Mozambique Rua de Kassuende, nº 118, 1º andar T +258 21 48 59 17/8 | F +258 21 48 59 23 E [email protected] | W www.rhdhv.co.mz

Transcript of Partitioning and Outfitting Works for Mozambique Country ... · Partitioning and Outfitting Works...

Partitioning and Outfitting Works for Mozambique Country Office

HVAC Detailed Project – Technical Specifications

Rev. 00

31 October 2016

Submetido por: HaskoningDHV, Lda Maputo – Mozambique Rua de Kassuende, nº 118, 1º andar T +258 21 48 59 17/8 | F +258 21 48 59 23 E [email protected] | W www.rhdhv.co.mz

PROJECT TITLE: Partitioning and Outfitting Works for Mozambique Country Office

DOCUMENT TITLE: HVAC Detailed Project – Technical Specifications

Prepared for:

The African Development Bank

Prepared by:

HaskoningDHV, Lda

Rua de Kassuende, Nr. 118, 1º andar

Maputo

Moçambique

Tel: +258 21 485917/8

Fax: +258 21 485923

Web: www.rhdhv.co.mz

Document History – KA1301-DD-VAC-TEC-001

00 31-10-16 Issued for Approval AD CT MV

Revision Date Purpose Description Prepared Checked Approved Client Approval

HVAC - Technical Specifications Page i

31st October 2016

AFRICAN DEVELOPMENT BANK GROUP

PARTITIONING AND OUTFITTING WORKS FOR MOZAMBIQUE COUNTRY OFFICE

HVAC Detailed Project

TECHNICAL SPECIFICATIONS

CONTENTS:

1 DESIGNATION OF WORKS ...................................................................................................................... 3

2 GENERAL .................................................................................................................................................. 3

3 SAFETY AND LABOUR REGULATIONS .................................................................................................. 3

4 INSPECTION AND TESTING .................................................................................................................... 3

5 DOCUMENTS TO BE FURNISHED ON COMPLETION OF INSTALLATION .......................................... 4

6 APPLICABLE STANDARDS AND CODES, TERMS AND DEFINITIONS ................................................ 4

7 GENERAL MECHANICAL REQUIREMENTS ........................................................................................... 4

7.1 Submittals ................................................................................................................................................ 4

7.2 Brochures ................................................................................................................................................. 5

7.3 Regulatory Requirements ........................................................................................................................ 5

7.4 Project and Site Conditions ..................................................................................................................... 5

7.5 General Installation Features ................................................................................................................... 5

8 SPECIFICATIONS FOR AUTOMATIC CONTROLS ................................................................................. 6

8.1 Scope ....................................................................................................................................................... 6

8.2 Products ................................................................................................................................................... 6

9 SPECIFICATIONS FOR AIR TERMINALS – AIR DIFFUSERS AND GRILLES ....................................... 7

9.1 Scope ....................................................................................................................................................... 7

9.2 Type ......................................................................................................................................................... 7

9.3 Supply Air Diffusers ................................................................................................................................. 7

9.4 Return Air Grilles ...................................................................................................................................... 7

10 PACKAGED AIR COOLED UNITS ............................................................................................................ 9

10.1 Scope ....................................................................................................................................................... 9

10.2 Type ......................................................................................................................................................... 9

10.3 Capacity ................................................................................................................................................... 9

10.4 Compressor ............................................................................................................................................. 9

10.5 Condensor ............................................................................................... Error! Bookmark not defined.

10.6 Cooling Coil .............................................................................................................................................. 9

10.7 Fan Section .............................................................................................................................................. 9

10.8 Other Features ......................................................................................................................................... 9

10.9 Painting .................................................................................................................................................. 10

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11 INSPECTION AND TESTING PROCEDURES ....................................................................................... 11

11.1 Pipes ...................................................................................................................................................... 11

11.2 Insulated Ducting ................................................................................................................................... 11

11.3 Final Inspection ...................................................................................................................................... 11

11.4 Final Notes ............................................................................................................................................. 12

ABBREVIATIONS LIST

ADB African Development Bank

MOZFO Mozambique’s Office

HVAC Heating, Ventilation and Air Conditioning

SAD Supply Air Diffuser

RAG Return Air Grill

PACU Packaged Air Cooled Unit

AHU Air Handling Unit

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AFRICAN DEVELOPMENT BANK GROUP

PARTITIONING AND OUTFITTING WORKS FOR MOZAMBIQUE COUNTRY OFFICE

HVAC Detailed Project

TECHNICAL SPECIFICATIONS

1 DESIGNATION OF WORKS

Partitioning and Outfitting Works for Mozambique Country Office for the African Development Bank Group.

The premises where the project will be implemented are located at Torres Rani, Avenida da Marginal,

Maputo, half part of the fourth floor on the sea-facing section of the building newly built.

2 GENERAL

The present documentation should be considered as part and complementary to all documents and

drawings of others engineering disciplines involved as well as others contract documents. It includes

technical specifications for the major activities, equipment and materials to be installed in the HVAC system

of the Mozambique Country Office for the African Development Bank Group.

The tenderer should, in his own interest, visit the site and familiarize himself with the site conditions before

tendering. For any clarification, tenderer may discuss with the Engineer-in-Charge.

All supplied components shall conform to relevant International Standards and Codes referred to in other

part of this tender document.

3 SAFETY AND LABOUR REGULATIONS

All the safety procedures and regulations shall be complied with.

In respect of all labour employed directly or indirectly on the work for the performance of the HVAC

contractor’s part of work, the contractor at his own expense, will arrange for the safety provisions as per the

statutory provisions. Failure to provide such safety requirements would make the tenderer liable for penalty

for violation.

The contractor shall provide necessary barriers, warning signals and other safety measures while installing

equipment and laying ducts, cables etc. or wherever necessary so as to avoid accident and incident.

4 INSPECTION AND TESTING

Initial inspection of materials & equipment’s before installation as per engineering good practices will be

carried out by the engineer-in-charge or his representative. For items or equipment requiring initial

inspection at manufacturer’s works, the contractor will intimate the date of testing of equipment’s at the

manufacturer’s works before dispatch.

The contractor shall give sufficient advance notice regarding the dates proposed for such tests to the

department’s representatives to facilitate his presence during testing. The Engineer-in-charge at his

discretion may witness such testing.

Equipment’s must be inspected at the manufacturer or authorized dealer’s premises, before dispatch to the

site by the contractor, as he is the last responsible for goodness of the goods supplied.

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The engineering department also reserves the right to inspect the fabrication job at factory and the

successful tenderer has to provisions for the same.

The materials duly inspected by engineer-in-charge or his authorized representative shall be dispatched to

site by the contractor, in his own costs.

Final Inspection & testing will be done by the Contractor under Engineer-in-Charge or his representative

witness as common practice in this type of installations.

All equipment shall incorporate suitable safety provisions to ensure safety of the operating personnel at all

times. The initial and final inspection reports shall bring out explicitly the safety provisions incorporated in

each equipment.

5 DOCUMENTS TO BE FURNISHED ON COMPLETION OF INSTALLATION

At completion of the installation works and as part of the Contract Deliverables the Contractor shall furnish

to the Client 3 (three) sets of the following documentation:

a) As built drawings of the HVAC system installed;

b) Manufacturer’s technical catalogues of all supplied equipment, materials and accessories;

c) Operation and Maintenance Manuals of all major equipment’s, detailing all adjustments, operation

and basic maintenance procedures.

6 APPLICABLE STANDARDS AND CODES, TERMS AND DEFINITIONS

The following terms have been used in the tender specifications and drawings etc.

ASHRAE American society of Heating Refrigeration and Air-Conditioning Engineers

ASME American Society of Mechanical Engineers

BS British Standard

ANSI American National Standard Institute

ARI Air Conditioning Institute

ASTM American Society of Testing and Materials

BTU/h. British Thermal Unit per Hour

Kcal/h Kilo Calories per Hour

RAG Return Air Grill

SAD Supply Air Diffuser

7 GENERAL MECHANICAL REQUIREMENTS

This chapter deals with the general mechanical requirements specifically applicable to HVAC systems. The

additional requirement given in any chapter is in addition to the bare minimum stated in this and shall be

complied with.

7.1 Submittals

All major items like diffusers, grills, valves, control and instrument devices, insulation, etc should be

submitted to the Engineer in charge for approval through an official approved transmittal template before

the commencement of the project implementation.

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Only products – equipment and materials – from reputable manufacturers and suppliers, preferable with a

commercial and Technical support team based in Mozambique, shall be acceptable.

In case of any alternate make is required to be used the same will have to be approved by the customer or

the engineer in charge; for that the contractor is called to submit with proper justification his motivations for

the proposed change before delivery to the installation site. Shop drawings and product data grouped to

include complete submittals of related systems, products, and accessories in a single submittal.

The referred shop drawings shall be based on the actual duct routes after the site survey, details of

supporting systems for the various equipment’s, layout of the air terminals including dimensions of the

room, the sizes and all necessary construction details required on site, location of the allied equipment and

the requirements from other agencies, sleeve location if any, fresh air and exhaust air locations, location of

wall mounted equipment and any structural inputs.

7.2 Brochures

Submit manufacturer’s product data and brochure including complete description of the item with

illustrations, rating charts, accessories, dimensional data, capacities stated in the most important terms.

7.3 Regulatory Requirements

Liaison and or approvals from the HVAC works at the building related bodies if any, if required, shall be

taken by the Contractor on behalf of the Client and at his own cost.

7.4 Project and Site Conditions

Mechanical layouts indicated on drawings are diagrammatical.

Final coordination shall be required with other involved engineering agencies prior to commencement of the

installation.

All works shall be installed as shown on the drawings or as agreed by all the involved agencies, unless

prevented by project conditions.

Prepare drawings showing proposed rearrangement of work to meet the project conditions.

Obtain permission from of engineer in charge before proceeding.

Do measurements and marks of the anchoring points for the equipment and accessories. Do not

drill holes before permission from of engineer in charge.

Keep the accesses and the circulating areas clear of any equipment, material or tool.

7.5 General Installation Features

Ducting installation requirements are specified in other section. The Drawings indicate the general

arrangement of ducts, supply air diffusers, and return air grilles and specialties. The following are specific

connection requirements:

Arrange ducting installations adjacent to units to allow unit servicing and maintenance.

Connect ducting to all equipment with flexible connections enabling easy removal of the inner

components for servicing and maintenance.

Connect condensate drain pans if any using drain pipe and extend to nearest building’s existing

drain riser.

Make final duct connections with flexible connections.

Connect unit components to ground in accordance with the National Electrical Code.

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8 SPECIFICATIONS FOR AUTOMATIC CONTROLS

8.1 Scope

The scope of this section comprises the supply, installation, testing and commissioning of automatic

controls conforming to these specifications and in accordance with requirement of Technical Description of

the Works, Drawings and Bill of Quantities.

8.2 Products

In terms of controls and instruments the proposed HVAC uses a modular system design extremely reliable

which makes it usable in most of the types of buildings regardless of their size or function. It is made up of

the following components:

Power Supply Module;

On-board Master Controller;

Master Diffuser and Slave Diffuser, if required (due to the size of the room);

Wall thermostat.

The system shall be individually controlled by either the on-board master controller or a wall thermostat or

can be connected through a Communication Unit to a Building Management System (BMS). A single power

supply can be connected up to 15 diffusers from multiple HVAC zones.

All individual room thermostats shall be electronically mode, fixed, differential type with sensing element

located in its case. The standard wall thermostat monitors temperature and controls set up point. They can

control a single diffuser or up to 60 of them.

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9 SPECIFICATIONS FOR AIR TERMINALS – AIR DIFFUSERS AND GRILLES

9.1 Scope

The scope of this section comprises the supply, installation, testing and commissioning of air terminals

conforming to these specifications and in accordance with requirement of Technical Description of the

Works, Drawings and Bill of Quantities.

9.2 Type

The air terminals shall be of the type indicated in Drawings and Bill of Quantities, which are:

VAV Diffusers for air supply;

Eggs Crate Grilles for the air return side.

9.3 Supply Air Diffusers

This type of diffusers are of a plug and play system that uses daisy chain connections which helps to

minimize the installation costs and prevent the risk of using incorrect connectors.

For existing ducting system it is highly recommended to install a relief ring at the end of it to release air

pressure when the diffusers close.

The flexibility of these diffusers system enables it to be installed in both a small single room with only one

diffuser applications and large multi HVAC zone projects with dozens of diffusers. And the designs are:

Only one diffuser (as master) with wall thermostat connected to a power supply;

Up to four diffusers (one master and up to three slaves) with wall thermostat or on-board controller

connected to a power supply.

Combinations are possible when the room temperature is read from the master diffuser, the set point read

from the wall thermostat and the entire system is monitored from dedicated and specific software.

For this project it is recommended to supply and install diffusers in built-in occupancy sensors, to avoid

additional sensor, circuits and wiring. This technology closes the opening of the diffuser if it detects that the

room is unoccupied and opens it again if detects the presence of an occupant in the room. The timing is

factory set to 15 min but can be adjusted to the user expectancy using the above mentioned software.

The diffuser is painted with white aluminum RAL 9006, but if required it can be supplied painted in white

RAL 9010 or other color adopted by the Architect.

The 595x595 diffusers seat in to the “T” steel pieces of the false ceiling support structure.

All diffusers shall have soft continuous rubber foam gasket between the periphery of the diffusers and the

surface on which it has to be mounted.

9.4 Return Air Grilles

Return air grilles shall be egg crate type made of from thin aluminum strips arranged into a lattice -

aluminum border and aluminum grid. The grilles shall be powder coated in finish and provided with

removable central grid.

The square holes in the core are sized 12.5mm x 12.5mm, resulting in a free area of over 90% of the grille

size.

The grille is painted with white aluminum RAL 9006, but if required it can be supplied painted in white RAL

9010 or other color adopted by the Architect.

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The grilles require the fitter to cut an opening in the false board according to the nominal width and length

dimensions specified. Press the mounting frame into the false ceiling and secure it in position with blind

rivets. Then press the grille into the mounting frame. Sealant is applied between the commissioning box

and mounting frame to avoid leakage. And the 595x595 diffusers seat in to the “T” steel pieces of the false

ceiling support structure.

All the return air grilles shall be fitted with a G4 filter.

All grilles shall have soft continuous rubber foam gasket between the periphery of the diffusers and the

surface on which it has to be mounted.

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10 PACKAGED AIR COOLED UNITS

10.1 Scope

The scope of this section comprises the supply, installation, testing and commissioning of packaged air

cooled units conforming to these specifications and in accordance with requirement of Technical

Description of the Works, Drawings and Bill of Quantities.

10.2 Type

The Packaged Air Cooled Units shall be ceiling mounted totally self-contained units, complete with variable-

speed inverter compressor and inverter fan motors assemblies, condensers, cooling coils, interconnecting

refrigerant piping, control panel, controls and internal wiring and shall be enclosed in a robust cabinet.

The unit shall provide dedicated air conditioning to server rooms, conference rooms and other spaces

requiring cooling for people and sensitive equipment.

10.3 Capacity

Actual refrigeration capacity of Packaged Air Cooled Units shall be as given in Bill of Quantities.

10.4 Compressor

The compressor shall be for heavy duty, hermetic variable-speed inverter, sealed with gas cooled motor.

The motor and compressors shall be enclosed in a single casing. The compressor shall be suitable for R-

410A refrigerant or other ozone friendly fluid.

10.5 Condenser

Condenser shall be of air cooled, fitted with integral finned copper tubes of 12 mm O.D. Condenser shall be

manufactured to ASME code for unfired pressure vessels. Working pressure for refrigerant side shall be for

refrigerant used. Condensers shall be complete with hot gas inlet connection, liquid outlet connection, relief

valve, purge valve, fusible plug, air vents and any other standard accessories necessary for equipment

operation.

10.6 Cooling Coil

The cooling coil shall have copper tubes of not less than 1/2 “O.D. continuous Aluminum plate fins. The

tubes shall be staggered in the direction of the Airflow.

Suitable cleanable air filters shall be provided before the coil.

10.7 Fan Section

The fan Section shall consist of Forward curved fans, complete with scrolls, shaft and self-aligning

bearings, fan motor mounted on flexible supports and adjustable speed drive.

10.8 Other Features

The units shall be complete with wall mounted controller that offers advanced communication, monitoring,

self-diagnostic and thermostat and other necessary controls and safety devices.

The various components shall be interconnected by copper refrigerant pipes, fittings and valves.

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The suction line shall be suitably insulated.

The unit shall be complete with required charge of refrigerant gas and Lubricating oil.

The Units should be complete with factory manufactured control panel housing the starters; safety control

relays etc. the various electrical components shall be neatly prewired at the factory requiring only main

power supply from external source.

All components listed above shall be enclosed in factory built sheet metal cabinet. The cabinet shall be

divided in compressor section, cooling coil section and fan section. The whole cabinet shall be insulated

with 25 mm insulation. It shall have suitable openings for fan outlets, return air grille, intake and exhaust

condenser air.

The unit can fit in tight spaces easier than usual fan coils. A built-in mounting bracket, along with built-in

flanges and vibration isolators, allows easy installation above a drop ceiling, using standard, off-the-shelf

hardware.

10.9 Painting

All the equipment including mounting frame shall be painted with two coats of approved enamel paint.

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11 INSPECTION AND TESTING PROCEDURES

All major equipment’s such as panels, diffusers, grilles shall be got inspected by the Engineer in charge and

Customer representative at works of the HVAC Contractor, if he so desires.

All routine and Type tests shall be carried out and the test reports shall be submitted for approval before

dispatch. The engineer in charge is free to witness any or all tests. In any case the OEM test certificates

shall be submitted to the engineer in charge for verification of the same before the payments for the same

can be processed.

The HVAC contractor shall inform the engineer in charge well in time about the date of readiness of the

equipment for inspection and testing. The inspection process shall be as described below:

11.1 Pipes

Make, wall thickness for the pipe, if applicable, shall be checked at random for 5% of pipe lengths and shall

be correlated with relevant international codes.

11.2 Insulated Ducting

The insulated board to be used shall be physically checked for gauge as per relevant international codes.

The bend test shall be performed at site. Randomly one sample of each thickness shall be checked

chemically for composition, physically checked for quality and thickness and report shall be submitted

before starting work at site.

The samples shall be checked for density at site. The same shall be correlated with the manufacturer test

certificates.

11.3 Final Inspection

After completion of entire installation as per specifications in all respects, the HVAC contractor shall

demonstrate to the Engineer in charge trouble free operation of the entire installation simultaneously.

The test readings shall be recorded in a mutually acceptable format. All tests shall be carried out by the

HVAC contractor at his own expenses and shall be witnessed by the Engineer in charge or his

representative.

All the necessary utilities such as power and water or other shall be provided by the owner free of cost.

Ant the tests shall include but will not be limited to the following:

To check satisfactory functioning of all equipment installed;

Clean all equipment to remove foreign material and construction dirt and dust with Vacuum cleaner;

Verify that the equipment is secure on mounting and supporting devices and that connections for

ductwork, equipment, control devices and electrical are complete;

Perform cleaning and adjustments as specified per equipment manufacturers;

Set supply air dampers to minimum outside-air setting, if applicable;

Install temporary throw away filters for initial run and finally install clean filters;

Verify automatic volume control;

Shut unit down and reconnect automatic temperature control system;

All supply air diffusers and return grilles shall be computed from the measurements of air flow and

dry and wet bulb temperatures of air entering and leaving the room. Flow measurements shall be

by a calibrated rotating vane anemometer and temperature measurements by accurately calibrated

mercury-in-glass thermometers. Computed ratings shall conform to the specified capacities and

quoted ratings.

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11.4 Final Notes

All measuring instruments such as thermometer, anemometers, flow meter, etc. or any other

necessary instrument and services requires for the tests shall be arranged by the HVAC contractor

at his own expense.

The instruments shall be new and shall have a valid calibration certificate from a renowned test lab;

The plant shall be run initially and all equipment’s shall be adjusted to give desired results as per

contract. Thereafter the plant shall be test run for 96 hours as described above and the readings

shall be demonstrated in the required format. The test shall be witnessed by the owners and

engineer in charge or his representative. In case the conditions are not achieved during the initial

run test the plant shall be readjusted and the new dates for tests shall be determined. The entire

test shall be repeated and satisfactory results shall have to be obtained.

Only after satisfactory test the installation shall be taken over by the customer and warranty period

for one year shall commence.

The test readings shall be suitably adjusted for the absence of peak ambient conditions, fouling

factor, and available load.

The snag list prepared jointly after initial test shall be attended to by the Contractor during a

maximum of 30 days from the start of warranty period. Failure to do so shall result in corresponding

increase of warranty period.