HVAC System

Ab u Dh abi Oil Refi ning ni ng Com pany

DGS-AU-063 Rev-1 May 2009

HVAC HVAC SYSTEM

DGS-AU-063-Rev-1

HVAC SYSTEM

Am end men t Hi st or y

01

May 2009 2009

AMD-AU-063 AMD-AU -063-BE -BECHT CHTEL EL

Clause#1.0,2,0b,3.0 Clause#1.0,2,0b,3.0,, 4.0,6.0,10.0,10.1,10.2,10.4, 11.1,11.2,11.3,11.4,11.5,

MLM/SMK / PL/HD

QAM / MAY MAY

May 2009

11.6,11.7,11.8,11.9,11.10. 13.1b,13.1c,13.1d, 13.2.1,13.2.5,13.2.13,13.3b 13.4a, 13.4b No

Date

Amendmen Amendmentt

Description

P roposed

Approved

Incorporated

DGS Histo Histo ry

No

1

May 2009 2009

DGS-CU-063 DGS-C U-063-Rev-1 -Rev-1

AMD-AU-063 AMD-AU-063-BEC -BECHTE HTEL L

0

Mar 2006 2006

DGS-CU DGS -CU-063 -063-Rev-0 -Rev-0

P revious revious P roject / Lessons Learnt Incorporated

SMK /MLM / HD

ETSDM / EPDM

Date

Description

Source

Reviewed

Approved

Takreer DGS-AU-063-Rev-1 DGS-AU-063- Rev-1 May-2009 Printed 02-Jul-09 10:28:55

MLM/SMK / PL / HD

Initials

QAM / MAY

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Ab u Dh abi Oil Refi ning ni ng Com pany


HVAC HVAC SYSTEM

Table of Contents 1.0 GENER GE NERAL AL ............... ....................... ................ ................ ............... ............... ................ ................ ................ ................ ................ ............... ............... ................ ............. ............ ....... 3 2.0 CODES AND STANDARDS ................ ....................... ............... ............... ............... ................ ................ ................ ............... ............... ................ ............... .......... ... 3 3.0 REFERENCE DOCUME NTS ............... ....................... ............... ............... ................ ................ ................ ................ ................ ................ ................ .............. ...... 5 4.0 DOCUMENT P RE CEDENC CE DENCE E .............. ...................... ................ ................ ................ ............... ............... ................ ............... ............... ................ ................ ........ 5 5.0 SPECIFICATION DEVIATION/CONCESSION CONTROL CONT ROL....... ............... ................ ................ ............... ............... ................ .......... .. 6 6.0 QUALITY ASSURANCE/QUALITY CONTROL CONT ROL ............... ....................... ................ ................ ................ ................ ................ ................ .......... .. 6 7.0 DOCUME NTATION NTATION ................ ....................... ............... ................ ............... ............... ................ ................ ................ ............... ............... ................ ................ .............. ...... 6 8.0 SUBCO SU BCONTR NTRACTO ACTOR/VE R/VENDOR NDOR ............... ....................... ................ ................ ................ ............... ............... ................ ............... ............... ................ ............ .... 7 9.0 WORK INCL WORK INCLUDED UDED ............... ....................... ............... ............... ................ ................ ................ ................ ................ ................ ............... ............... ................ ............... ....... 8 10.0 DESIGN CRITE CR ITERIA RIA ................ ........................ ............... ............... ................ ................ ................ ................ ................ ............... ............... ................ ................ ............. ..... 8 11.0 HVAC SYSTEMS DESCR DES CRIP IPTION TION ............... ....................... ................ ................ ................ ................ ................ ................ ................ ................ .............1 .....11 1 12.0 HVAC CONTROLS .................................................. ....................... .................................................... .................................................... .......................................... ............... 13 13.0 EQUIP EQ UIPMENT MENT/MA /MATE TERIA RIALS LS ................ ....................... ............... ............... ............... ................ ................ ................ ............... ............... ................ ............... ......... .. 13 14.0 TEST AND BALANCING OF SY STEMS ST EMS ............... ....................... ................ ................ ................ ............... ............... ................ ................ ............ .... 17 15.0 GUARANTE GUAR ANTEE E ............... ....................... ................ ............... ............... ................ ................ ................ ................ ................ ................ ................ ................ ................ ............ .... 17 ADDENDUM SHE ET ................ ........................ ................ ............... ............... ................ ................ ................ ............... ............... ................ ................ ............... ............... ............. ..... 18

List of Authorized Signatures / Initials DGS Discipline Comm ommittee ittee Member Member,, ADRD: ADR D:

None

DGS Discipline C omm ommittee ittee Member Member,, RRD:

Hani Dawod (HD)

DGS Discipline Comm ommittee ittee Member Member,, E &P D:

Megharaj Megharaj L. Mane (MLM) (MLM )

DGS Discipline Comm ommittee ittee Member Member,, E &P D:

P atrick atrick Lobo(PL) Lobo(P L)

DGS Discipline Comm Committee ittee Member Member Leader, Leader, E&PD: E&P D: S hivaji hivaji M Karade (SMK (SMK)) E ngineering ngineering & Technical Technical Services Manager Manager, E&PD: E&PD: Quazi Abdul Matin (QAM) (QAM) E ngineering ngineering & P rojects rojects Division Manager, Manager, E &PD:

Mohd Al Yabhouni (MAY) (MAY)

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Abu Dhabi Oil Refi ning Com pany


HVAC SYSTEM

1.0

GENERAL

1.1

INTRODUCTION

This specification covers furnishing of all labor, materials, equipment, supervision, storage, and each and every item of expense necessary for the CONTRACTOR(S) to perform the engineering, design, procurement, installation, and start up of complete and operable, heating, ventilating and air conditioning (HVAC) systems for Substation, Satellite Instrument Shelters (SIS), Expansion to Existing Substation Buildings, Combined Substation and SIS Buildings ,Workshop Buildings and any other building as described in this contract. 1.2

PURPOSE

This specification contains the criteria and design parameters necessary for engineering and design of the HVAC systems and associated components. 1.3

DEFINITIONS

For purposes of this specification, the following definitions shall apply: CONCESSION REQUEST — A deviation requested by the fabricator or VENDOR, usually after receiving the contract package or purchase order. Often, it refers to an authorization to use, repair, recondition, reclaim or release materials, components or equipment already in progress or completely manufactured but which does not meet or comply with COMPANY requirements. A Concession Request is subject to COMPANY approval. SHALL — Indicates a mandatory requirement SHOULD — The use of the word “should” indicates a strong recommendation to comply with the requirements of this document. 2.0

CODES AND STANDARDS

a.

All work and equipment provided under this contract shall be installed in strict accordance with local codes, ordinances, rules and regulations of public administrative authorities including all health and safety related codes.

b.

The following Codes and Standards shall, to the extent specified herein, form a part of this specification.

c.

Where this specification differs with the referenced Specifications or Codes and Standards, this specification shall govern.

As so ci ated A ir Balance Cou ncil (AA BC) Ai r Di ff usio n Counci l (A DC)

ADC 1062:GRD

Test Codes for Grilles, Registers, and Diffusers

ADC-01

Directory of ADC Certified Products

Ai r-Condit io ni ng and Refrig eratio n In st it ut e (ARI)

ARI 210

Unitary Air Conditioning Equipment

ARI 270

Standard for Sound Rating of Outdoor Unitary Equipment

ARI 360

Commercial and Industrial Unitary Air-Conditioning Equipment

ARI 410

Forced Circulation Air-Cooling and Air-Heating Coils

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HVAC SYSTEM

ARI 430

Central Station Air-Handling Unit

Am erican Soc iet y f or Test in g and Materials (ASTM)

ASTM A 53

Standard Specification for Pipe, Steel, Black, and Hot-Dipped, ZincCoated, Welded and Seamless

ASTM A 90

Standard Test Method for Weight of Coating on Zinc-Coated (Galvanized) Iron or Steel Articles

ASTM A 527

Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Lock-Forming Quality

ASTM A 666

Standard Specification for Austenitic Stainless Steel, Sheet, Strip, Plate, and Flat Bar

ASTM B 62

Standard Specification for Composition Bronze or Ounce Metal Castings

ASTM B 88

Standard Specification for Seamless Copper Water Tube

ASTM B 280

Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service

ASTM C 552

Standard Specification for Cellular Glass Thermal Insulation

ASTM D 579

Standard Specification for Greige Woven Glass Fabrics

AMCA 210

Air Moving and Control Association for Design and Testing of Fans

Am erican Societ y of Heating , Refrig eratin g, and Ai r Condi ti on ing Engin eers, Inc . (ASHRAE)

ASHRAE 14

Methods of Testing for Rating Positive Displacement Condensing Units

ASHRAE 15

Safety Code for Mechanical Refrigeration

ASHRAE 20

Methods of Testing for Rating Remote Mechanical- Draft Air-Cooled Refrigerant Condensers

ASHRAE 52-76

Method of Testing Air Cleaning Devices Used in General Ventilation for Removing Particulate Matter

ASHRAE 90A

Energy Conservation in New Building Design (Sections 1 through 9)

National Environmental Balancing Bureau (NEBB)

NEBB-01

Procedural Standards for Testing Adjusting of Environmental Systems

National Fire Protection Association (NFPA)

NFPA 70

National Electrical Code

NFPA 90A

Standard for the Installation of Air Conditioning and Ventilating Systems

NFPA 220

Standard on Types of Building Construction

NFPA 255

Method of Test of Surface Burning Characteristics of Building Materials

Rubber Manufacturers As sociation (RMA)

RMA IP-20

Specifications for Drives Using Classical Multiple V-Belts, and Sheaves - Cross Sections, A, B, C, and D


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HVAC SYSTEM

Sheet Metal and Air Conditioni ng Contr actors National Ass ociation, Inc. (SMACNA)

SMACNA-06

HVAC Duct Construction Standards - Metal and Flexible

Underwriters Laboratories, Inc. (UL)

UL 181

Factory-Made Air Ducts and Connectors

UL 207

Refrigerant - Containing Components and Accessories, Nonelectrical

UL 303

Refrigeration and Air-Conditioning Condensing and Compressor Units

UL 465

Central Cooling Air Conditioners

UL 900

UL Standard for Safety Air Filter Units - Sixth Edition

International Organization for Standardization (ISO)

3.0

ISO 9001-2000

Quality Management System Requirements

ISO 9004-2000

Quality Management Guidelines for Performance Improvement System

REFERENCE DOCUMENTS

The following Reference Documents, to the extent specified herein, form a part of this specification. Specifications:

4.0

DGS-AU-055

Thermal and Moisture Protection

DGS-AU-064

Plumbing

DGS-EU-002

Specifications for Electrical Items On Packaged Equipment

DGS-IS-003

Fire and Gas Detection System

DGS-MU-200

Fire Protection Design Philosophy

DGS-MU-204

Fire Protection Clean Agent Systems

DGS-MU-002

Preservation and Export Packing

DGS-MU-004

Lubrication Requirements

DGS-MM-001

Electric Motors – Cage Induction and Synchronous

DOCUMENT PRECEDENCE

It shall be the Subcontractor/Vendor's responsibility to be, or to become, knowledgeable of the requirements of the referenced Codes and Standards. The Subcontractor/Vendor shall bring to Contractor's attention, any apparent conflict between this specification, the related data sheets, the Codes and Standards and any other specifications mentioned herein. Resolution and/or interpretation precedence shall be obtained from the CONTRACTOR in writing before proceeding with the design/manufacture. In case of conflict, the order of precedence shall be as stated below:. 1. Equipment Data Sheets/Requisition 2. This specification 3. Industry Codes and Standards Takreer DGS-AU-063-Rev-1 May-2009 Printed 02-Jul-09 10:28:55

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HVAC SYSTEM 5.0

SPECIFICATION DEVIATION/CONCESSION CONTROL

Deviation from this specification are only acceptable where the Manufacturer has listed in his quotation the requirements he can not, or does not wish to comply with, and Company/CONTRACTOR has accepted in writing the deviations before the order is placed. In the absence of a list of deviations, it will be assumed that the Manufacturer complies fully with this specification. Any technical deviations to the purchase order and its attachments including, but not limited to, the Data Sheets and Narrative Specifications shall be sought by the VENDOR only through concession requests. Concession Requests require CONTRACTOR'S and COMPANY'S review/approval, prior to proposed technical changes being implemented. Technical changes implemented prior to COMPANY approval are subject to rejection. 6.0

QUALITY ASSURA NCE/QUAL ITY CONTROL

The Subcontractor shall have in effect at all times, a QA/QC program which clearly establishes the authority and responsibilities of those responsible for the quality system. People performing quality functions shall have sufficient and well defined authority to enforce quality requirements, initiate, identify, recommend and provide solutions to quality problems and verify the effectiveness of the corrective action. VENDOR’S proposed quality system shall fully satisfy all the elements of ISO 9001 - 2000 and ISO 9004 – 2000 with due regard to ISO 19011. The quality system shall provide for the planned and systematic control of all quality-related activities performed during fabrication. Implementation of the system shall be in accordance with the fabricator's Quality Manual and project Specific Quality Plan, which shall both, together with all related/referenced procedures, be submitted to the CONTRACTOR for review, comments and approval. The CONTRACTOR reserves the right to inspect materials and workmanship at all stages of fabrication and to witness any or all the tests. The Subcontractor, 30 days after award, but prior to the pre-inspection meeting, shall provide the CONTRACTOR with a copy of its fabrication documents (shop drawings) and inspection plan for review and inclusion of any mandatory comments by the CONTRACTOR. 7.0

DOCUMENTATION

The following documents shall be prepared by CONTRACTOR and/or Subcontractor: Calculations:

Calculations shall be complete, neatly bound and indexed for submittal to the COMPANY for review and approval at each phase of design required. Design conditions, building "U" factors, and other basis of calculations shall be clearly shown on the lead sheet of the calculations. Drawings:

a.

Each drawing shall be provided with a title block in the bottom right-hand corner incorporating the following information: -

Official trade name of the COMPANY

-

Fabricator's drawing number


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HVAC SYSTEM

-

Drawing title giving the description of the contents whereby the drawing can be identified

-

A symbol or letter indicating the latest issue or revision

b.

The drawings shall indicate the required size and general arrangement for all equipment and components, all laid out to scale using the most current architectural drawing building plans as the background for the HVAC plans.

c.

All equipment shall be identified by unique equipment tag numbers (e.g. air handlers identified as AH - 1, AH - 2, etc.).

d.

Routing of piping and/or any other part of the installation shall be coordinated with the designs of other trades. The design of all ductwork, piping and other parts of the installation shall be arranged accordingly.

e.

Routing of ductwork shall be shown in double line format, and piping may shown by as a single line.

f.

Detail sections and enlarged plans shall be used where required to provide a complete, constructable set of drawings.

The CONTRACTOR and/or Subcontractor shall submit drawings, specifications, materials and equipment data, shop drawings, manuals, reports, and all other items required in the format and quantities required at milestones designated by the contract documents: a.

Shop Drawings The CONTRACTOR and/or Subcontractor shall prepare any supplementary (shop) drawings required for clarifying details regarding shop fabrication or field installations.

b.

Submittals of Material and Equipment Data Submittal shall be made of each type of material and equipment to be used.

c.

Operating and Maintenance Manuals Submit operating instructions for each system including step-by-step preparation for starting, normal operation, and stopping, and instructions for maintaining the equipment items. These shall be bound with an index sheet and shall contain wiring and control diagrams, written sequence of operation, spare parts list, and manufacturer's catalog information of equipment items.

d.

As-Built Drawings Record as-built drawings shall be submitted in accordance with the contract and these specifications.

8.0

SUBCONTRACTOR/VENDOR

The Subcontractor/Vendor shall submit documents and quantity of drawings for CON TRACTOR'S authorization or information as listed in the individual Material Requisition and Purchase Orders. Mutual agreement on scheduled submittal of drawings and engineering data shall be integral part of any formal Purchase Order.


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HVAC SYSTEM

Comments made by the CONTRACTOR on the drawings submittal shall not relieve the Subcontractor or Vendor of any responsibility in meeting the requirements of the Project Specifications. Such comments shall not be construed as permission to deviate from requirements of the Purchase Order unless specific and mutual agreement is reached and confirmed in writing. 9.0

WORK INCLUDED

The work under this section shall apply to (HVAC) systems for buildings listed in Section 1.1. 9.1

ENGINEERING AND DESIGN OF THE HVAC SYSTEMS

The scope of work shall include the following:

9.2

a.

Design calculations

b.

Construction drawings

c.

Construction specifications

PROCUREMENT AND CONSTRUCTION OF HVAC SYSTEMS

The scope of work shall include the following: a.

HVAC equipment and materials including control systems

b.

Shop drawings of equipment and installations

c.

Complete installation of HVAC systems

d.

Provide all work and materials for the complete installation of automatic temperature control system

e.

Complete testing and balancing of HVAC systems

f.

Start up of the HVAC systems

g.

One (1) year warranty of HVAC systems after acceptance

h.

Test and inspection reports

i.

Operation and maintenance manuals

j. k. 10.0

As-built drawings Spare Parts and Special Tools

DESIGN CRITERIA

Engineering and design of the building HVAC systems shall be performed in accordance with the codes and standards and Reference Documents listed in this specification in Sections 2.0 and 3.0. The system shall be designed for a minimum life of 30 years and 5 years uninterrupted operation.


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HVAC SYSTEM 10.1

OUTDOOR DESIGN CONDITIONS

Summer

Winter 10.2

Dry Bulb

48°C

Wet Bulb

37°C

Dry Bulb

7°C

INDOOR DESIGN CONDITIONS

Indoor design conditions shall be as follows: Room

10.3

Summer Max ( C)

Winter Min C

RH (%)

Electrical Equipment Room (Substation)

24°

No Heating

35-70

Battery/UPS

24°

18°

35-70

Rack Equipment Room (SIS Building)

24°

24°

50

HVAC Equipment Room

30°

18°

35-80

Control Room/Administration Building

23°

23°

35-70

Office, Locker, P rayer, Kitchen, etc.

24°

24°

50

Electrical Room, Shop, Warehouse

24°

No Heating

35-70

Clinic, Laboratory, Mosque, Amenities Building, Conference Hall/Theatre, Communications Building

23°

Fire Station, Guard Houses, Analyser Shelters, Operator Shelters

24°

23°

24°

35-70

50

INTERNAL HEAT G AINS

The internal (equipment) heat dissipation loads shall be determined or estimated by the EPC contractor when sizing the AC equipment. For the equipment sizing purposes, the contractor shall consider heat dissipation from the electrical equipment as well as lighting in the space. To estimate the total cooling required, the total internal heat gains will then be added to heat transmission gains through exterior walls/roof and heat gains from ventilation air (outdoor air). 10.4

GENERAL HVAC REQUIREMENTS

Outdoor air shall be used for cooling whenever the use of the outdoor air would reduce the energy consumption of the air conditioning system. Minimum outdoor air quantities for ventilation shall meet the requirements of ASHRAE and/or as required for pressurization of the space.


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HVAC SYSTEM

A separate toilet/locker exhaust system shall be provided in all cases where these facilities are to be provided. Toilet area shall be ventilated at the minimum rate of 12 air changes per hour. The battery room shall be ventilated at the minimum rate of 15 air changes per hour (or as required by battery MANUFACTURER). The exhaust air shall be vented to the outside of the building. The new substation and SIS buildings shall be provided with air conditioning systems as described in Section 11.0. Electrical Equipment Room, Control Room and Rack Equipment Room shall be maintained at a minimum positive pressure of 2.5 mm water gauge relative to the outside atmosphere. The battery room for Substation and SIS Buildings shall be maintained at a negative pressure relative to adjacent spaces. The new Substation and SIS Buildings shall be provided with a 100% redundant (standby) AC unit. Heating requirements shall be based on zero internal heat gain. The air distribution system shall be designed to prevent generation of excessive noise and vibration. Provide A/C unit's condensate drain piping to an approved receptor by the local codes or the project. 10.5

A IR CONTAMINATION/A IR QUALITY

Indoor or outdoor air may contain contaminants which may cause corrosion and affect the reliability of the electronic equipment. To maintain the air contaminants below acceptable levels, the following issues shall be considered in the design:

10.6

a.

Humidity control shall be used to protect against corrosion.

b.

To avoid the entrance of dust into the building, adequate filtration shall be provided in the air handling units. In addition, the air handling units shall be designed to maintain a positive pressure in the space relative to the atmosphere.

c.

Outside air used by all A/C units shall be filtered by inertial type filtration units. Inertial units shall be installed upstream of air handling units at the outside air intakes so that sand, dust and airborne particulates are removed from the air stream prior to entering the air handling unit's filters. See section 13.2 "Products."

d.

Chemical filters are not recommended for the reasons of cost and maintenance. Their use in the design shall be approved by the COMPANY.

e.

All outside air intakes shall be designed and located away from the hazardous areas so that it minimizes the potential of introducing any hazardous gas or chemicals into the building.

MISCELLANEOUS SYSTEM DESIGN REQUIREMENTS

a.

AC systems shall be shut down automatically via the fire alarm panel upon detection of smoke/fire by the building's fire protection system.


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HVAC SYSTEM

b.

Three flammable gas detectors and two H2S detectors shall be provided at the outside air intake of HVAC system to shut down ventilation system and close the automatic isolation dampers (isolation dampers are used for the purpose of confinement when the clean agent gas is released inside the space). The battery ventilation fan shall continue to operate in case of H2 detection in the battery room.

c.

The CONTRACTOR shall be responsible for ensuring that all necessary fire dampers are provided within air-conditioning ducts penetrating fire wall/fire zone.

d.

All equipment, ducts, pipes, controls, etc. shall be fully treated against corrosion and sealed against moisture, sand and dust ingress.

e.

All equipment including ducts and pipes shall be vibration isolated by means of flexible piping, duct connectors, and vibration isolators per ASHRAE requirements.

f.

Space heating (if required) shall be provided via electric heaters in the air handling units or supply ducts. Heaters shall be interlocked with an airflow switch to disconnect the power supply when the fan is not in operation.

g.

Noise caused by HVAC equipment shall be 10 dB (A) below the noise level acceptable limits stated for the applicable buildings. Noise caused by HVAC equipment can be reduced by one of the following: -

Air Duct Silencers

-

Duct Lining

-

Selecting Quieter equipment Room

Noise Level

Electrical Equipment and Rack Equipment Rooms

70 dB(A)

HVAC Equipment Room

85 dB(A)

11.0

HVAC SYSTEMS DESCRIPTION

11.1

SUBSTATION B UILDING

The Substation Building is served by two (2) AC systems, each sized at 100% of room total cooling requirement, one operating and one standby. Each AC system consists of an air handling unit (indoor unit) and an air-cooled, at grade, condensing unit (outdoor unit). Condensing unit shall be provided with Sunshade. The AC unit for the substation shall be sized to handle the cooling loads for the switchgear room and cooling loads/make-up air for battery/UP S rooms. The air handling unit contains a DX cooling coil, blower, mixing air plenum with 65% efficiency filters. 11.2

B ATTERY/UPS ROOMS

The battery room is ventilated by two (one operating, one standby) continuously operating exhaust fans. The exhaust fan is sized based on 15 air changes per hour, (or as required by battery MANUFACTURER). Make-up air (cooling air) for the battery room shall be provided by one of the following: 1.

Deleted


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HVAC SYSTEM

2.

Direct supply air from the AC unit serving the electrical equipment room (Substation Bldg.).

3.

Direct supply air from the AC unit serving the rack equipment room (SIS Bldg.).

The cooling air for UPS room is provided from the AC unit serving the electrical equipment room (Substation Bldg.) or rack equipment room (SIS Bldg.). The exhaust fans in the battery room, S.I.S. Building Only, shall be powered from the emergency source of power. Upon activation of H2 detection in the battery room, battery room ventilation shall remain activated. 11.3

SIS B UILDING

The building is served by two (2) AC Systems, each sized at 100% of room total cooling requirement, one operating and one standby. Each AC system consists of an air handling unit (indoor unit) and an air-cooled, at grade, condensing unit (outdoor unit). The AC unit for the SIS Building shall be sized to handle the cooling loads for the control room and cooling loads/make up air for the battery/UP S rooms. The air handling unit contains a DX cooling coil, blower, mixing air plenum with 65% efficiency filters. . 11.4

EXPANSION TO EXISTING SUBSTATION B UILDINGS

DELETED 11.5

COMBINED SUBSTATION AND SINGLE SIS B UILDING

The building is served by two (2) AC Systems, each sized at 100% of building total cooling requirement, one operating and one standby. Each AC system consists of an air handling unit (indoor unit) and an air-cooled, at grade, condensing unit (outdoor unit). The AC unit for the Combined Substation and SIS Building shall be sized to handle the cooling loads for the switchgear room, SIS and cooling loads/make-up air for battery/UPS rooms. The air handling unit contains a DX cooling coil, blower, mixing air plenum with 65% efficiency filters.. 11.6

COMBINED SUBSTATION A ND MULTIPLE SIS B UILDING

The building is served by two (2) AC Systems , each sized at 100% of building total cooling requirement, one operating and one standby. The system description for this building is similar to the Combined Substation with Single SIS, covered in section 11.5. 11.7

WORKSHOP B UILDING , WORKSHOP AND W AREHOUSE

The building is divided into two zones. Each zone is served by a rooftop packaged AC unit. AC-1 is located above the offices and it serves the offices and the shop area. AC-2 is located above the prayer room and it serves the prayer, toilets and lockers. The air handling unit contains a DX cooling coil, blower, mixing air plenum with 65% efficiency filters. Storage room is ventilated at the rate of 6 air changes per hour. 11.8

CONTROL ROOM/ADMIN.BUILDING/A NY OTHER BUILDING

The control room and rack area shall be served by two (2) AC Systems , each sized at 100% of total cooling requirement, one operating and one standby. Each AC system consists of an air handling unit (indoor unit) and an air-cooled, condenser (outdoor unit) at grade. The system shall allow for downflow air distribution (under raised floor) where possible otherwise upflow air handling units shall be considered. The AC System shall include Takreer DGS-AU-063-Rev-1 May-2009 Printed 02-Jul-09 10:28:55

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HVAC SYSTEM

all environmental functions; cooling, dehumidification, reheat and humidification. A microprocessor control system shall control and monitor the temperature and humidity in the space. The control system shall provide all the necessary diagnostics and alarms to indicate a failure mode. In case of a failure, the control system shall automatically switch-over to the standby AC unit. The air handling units shall contain 65% efficiency filters. AC units are provided with an emergency source of power. Office spaces shall be served by an independent rooftop packaged AC unit. The AC unit shall contain 65% efficiency filters. 11.9

OFFICE

B UILDING/CONTROL ROOM

The control room and office spaces are maintained by HVAC systems - as described in section 11.8. 11.10

INTERFACE WITH FIRE PROTECTION/SUPPRESSION SYSTEM

Upon detection of smoke or fire by the fire protection system, the AC Systems in the Substation buildings or SIS building shall be shut down via the fire alarm panel. The smoke/fire detection system is covered in Project Specification DGS-MU-200. When 25% of LEL for flammable gas detector and H2 detector or 20 ppm for H2S detector is reached with the activation of 2 out of 3 flammable gas detector, 1 out of 2 of H2 detector or 2 out of 2 of H2S, the ventilation system will be stopped and dampers closed except in the case of H2 detection in battery room. Gas detection system is covered in project specifications DGS-MU-200 and DGS-IS-003. A clean agent Fire Protection System is provided for each Substation and SIS building. Upon activation of a second smoke sensor for the clean agent system, the fire panel shall activate a relay to shut down ventilation system and close dampers. Clean Agent System covered in project Specification DGS-MU-204. 12.0

HVAC CONTROLS

HVAC System's control design shall allow for remote monitoring of the HVAC units in case of a general failure. Substation and SIS buildings shall have high temperature alarms in order to monitor the status of the refrigeration units. Battery room fan shall have an explosion proof flow switch in the exhaust air path for monitoring the status of the fan. The CONTRACTOR shall supply and install the required instruments and HVAC instrumentation’s and control's interface with the plant's supervisory system. The CONTRACTOR shall review and receive COMPANY approval of HVAC instrumentation’s and control’s interface with the plants supervisory system design prior to installation. 13.0

EQUIPMENT/MATERIALS

13.1

GENERAL

a.

All HVAC equipment and materials shall be certified to have been tested and rated for performance and to conform to all applicable codes and standards listed herein.

b.

All HVAC equipment and materials shall be new and be the latest products selected from the Manufacturer’s of repute and subject to COMPANY Approval.

c.

The CONTRACTOR/VENDOR shall submit recommended Lubrication Schedule and Lubrication Material for each item in accordance with Project Specification, DGS MU-004, Lubrication Requirements.


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HVAC SYSTEM

d.

All equipment and material shall be preserved in accordance with Specification, DGS-MU-002, Preservation and Export Packing.

13.2

PRODUCTS

13.2.1

Packaged Air Conditioning System All components including compressors, fans, coils, filters and filters housings, controls and control panel,, dampers, piping, wiring, and unit frame shall be ready for terminal field connections with fully automatic operation. Condenser fans shall be direct drive propeller type, of corrosion-resistant construction. Indoor blower (evaporator fan) shall be belt driven and shall include an adjustable-pitch motor pulley. Compressors shall provide several stages of capacity when size permits. Compressors shall be semi-hermetic type with internal and external vibration isolation. Condenser coil construction shall be seamless copper tube, with "Herasite" coated aluminum extended surface plate fins integral with or mechanically attached to the tube. Evaporator coil construction shall be seamless copper tube, with aluminum extended surface plate fins integral with or mechanically attached to the tube. All components of the main power panel and all control devices shall be UL listed.

13.2.2

Air Handling Units Units shall be complete with fan section, cooling coil, control or expansion valve, filter section, access section, mixing box, condensate drain pan and motor. Supply fan shall be of the centrifugal type designed for continuous operation at maximum rated speed and static pressure. Single phase motors shall have inherent overload protection. Three phase units shall be furnished complete with motor starters. Cooling coil shall be constructed of aluminum fins on mechanically expanded copper tubes. Air Handling Unit's performance shall be certified in accordance with Air Conditioning and Units shall be rooftop mounted type, factory made unitary products, electronically controlled cooling units, designed to provide year-round cooling, heating, air circulating, ventilating, air cleaning, and dehumidifying functions. Unit shall be certified as complying with provisions of ARI 360 and 270 and UL 465, as applicable. Roof curb, if applicable, shall be designed to conform to NRCA Standards. Contained within the unit weatherproof casing shall be all factory Refrigeration Institute (ARI) Standard 430 for fans and 410 for coils.

13.2.3

Sand Removal Filters (Inertial Type Filter Unit) Units to be self-contained without moving parts, with welded housings of carbon steel construction, phosphated and primered with zinc chromate and finished with enamel, complete with inlet screen mesh, and flanged connection outlets for supply air and for bleed air. Construction shall be such that the stationary vane blade packs can be individually removed for cleaning, repair, and inspection. The supply air outlet (clean air) shall be ducted to the outside air intake of the air handling unit. An in-line fan may be considered to handle the clean air delivery to the air handling unit if required by the design. The bleed air (approximately 10% of supply air) shall be ducted to a bleed air, industrial type exhaust fan designed and equipped to efficiently handle air containing granular materials such as dust, sand, dirt and small debris.

13.2.4

Air-Cooled Condensing Units Units shall be complete with compressor of the serviceable hermetic type, condenser coil constructed of plate aluminum fins coated with "Herasite" on mechanically expanded copper tubes, condenser fans, miscellaneous accessories, and controls. Construction and


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HVAC SYSTEM

ratings shall be in accordance with ARI standard 210 and 270 and shall comply with ASHRAE 15 Safety Codes, and the National Electrical Code. 13.2.5

Exhaust Fans Fans shall be complete with motor, motor starter as required, factory installed disconnect switch, backdraft or isolation damper as required, prefabricated roof curb as required, and bird screen. Fan housing shall be constructed of heavy gauge aluminum and weatherproof. Fans shall have AMCA certified rating seal. For battery rooms, fans shall meet Hazardous area classification requirements as applicable.

13.2.6

Filters Air filters shall be two-inch thick pleated disposable type with an average efficiency of 65 percent and an average arrestance of 90-92 percent in accordance with ASHRAE Test Standard 52-76, listed as Class 2 in accordance with UL 900.

13.2.7

Vibration Isolators Vibration isolators shall be provided for all motor driven equipment.

13.2.8

Refrigerant Piping Refrigerant piping shall be water tube size hard copper tubing conforming to ASTM B8862 Type L with seamless wrought copper solder type fittings, isolation valves, filter-drier of the replaceable core type with micronic filtration, and sight glass as required. P iping 9.5 mm and smaller shall be type K. a.

Valves Valves 29 mm and smaller shall be forged brass body, diaphragm type, packless globe valve with solder ends. Valves 35 mm and larger shall be bronze alloy, nonrotating disk, nylon seats, bolted bonnet globe valve with solder ends.

b.

Pipe Insulation Insulation shall be applied in accordance with MANUFACTURER'S instructions over clean, dry pipe after all testing is completed and approved. Pipe insulation shall be heavy density rigid fiberglass with factory applied vinyl coated embossed foil vapor barrier laminate jacket with pressure sealing lap adhesive. The insulation shall be rated noncombustible by Underwriters Laboratories. Insulation for suction lines shall have a minimum thermal resistance (R value) of 1.46 meter-degree Kelvin per watt. Liquid and hot gas lines outside the building shall be insulated with minimum 25 mm thick glass fiber insulation with weatherproof covering. Insulation shall be Owens Corning Fiberglass ASJ /SS L or equal.

13.2.9

Condensate Drain Piping Galvanized steel conforming to ASTM A53, Schedule 40, galvanized cast iron screwed drainage fittings, insulated. All condensate drains from air conditioning equipment shall be trapped and vented with condensate drain pipes to be routed to an approved receptor. Approved indirect waste receptors shall be piped and drain to the sanitary sewer system. An alternate method shall be to terminate condensate drain piping at outdoor dry-well type sumps where condensate shall seep to below grade.


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HVAC SYSTEM

13.2.10

Ductwork All material used in fabrication of ducts, plenums, stiffeners and supports shall be new galvanized steel. sheet metal shall be galvanized sheet metal with a minimum zinc coating of 275 grams per square meter.

13.2.11

Volume Dampers Volume dampers shall be one gauge heavier than the duct and reinforced where required. Dampers over 200 mm in height shall be of multiple opposed blade type with factory manufactured linkage assembly.

13.2.12

Registers Supply air registers shall be of the double deflection type. Registers which are to be installed on exposed ductwork are to be furnished with a stain anodized finish. All other registers shall have a factory applied baked enamel prime coat.

13.2.13

Electric Duct Heaters Electric duct heater shall be a factory assembly with panel board meeting the requirements of IEC, shall be U. L. listed for zero clearance to combustibles, rated for use with air conditioning systems. Heating element shall be open coil, 80% nickel, 20% chromium, type resistance wire. Heater frames and terminal boxes shall be corrosion resistant steel with weatherproof construction, factory wired and ready for installation. Unit shall be complete with contactors and thermal cut-outs for temperature protection, control transformer, disconnect switch, airflow switch to prove air flow, fuses, pilot lights, etc. All electrical devices shall be in compliance to IEC standards and UL listed and rated.

13.3

13.4

Electric Power Supply a.

Electrical power for HVAC equipment with less than 0.18 kW motors shall be 240 volts/single phase/50 HZ and HVAC equipment with 0.18 kW or larger motors shall be 415 volts/three phase/50 HZ.

b.

Electrical power supply for the HVAC equipment shall be from normal power supply for all buildings except Main Control Room which shall be on emergency supply.

Specific Requirements a.

The battery room exhaust fan shall provide adequate ventilation to prevent accumulation of explosive gas . The Fan and Motor shall comply with the area classification.

b.

Condensers shall have suitable fin spacing to reduce the effect of sand clogging.

c.

Outdoor condensers shall be provided with weatherproof motors and condenser enclosure shall be designed to protect the fan, motor drive, and fined coils from the weather.

d.

The condenser frame, supports and enclosures shall be galvanized steel and be painted. Additional protective finish shall be provided against presence of salt and sand particulate in the atmosphere.

e.

The VENDOR shall provide a list for the following: •

A set of pre-commissioning spare parts

•

A set of spare parts for two years operation


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HVAC SYSTEM

14.0

•

Recommendation for “capital” spare parts for major equipment

•

Set of “special” Tools

TEST AND BALANCING OF SYSTEMS

After completion of the work, the CONTRACTOR or SUBCONTRACTOR shall test and regulate all air conditioning systems and equipment to conform to the capacities indicated on the Contract Drawings and Specifications. All test results shall be verified in the presence of, and inspected and approved by, the COMPANY or his representative at its option. Procedures, tests and instrumentation shall conform with the Associated Air Balance Council (AABC) National Standards or a similar test procedure approved prior to start of work. 15.0

GUARANTEE

All materials and equipment furnished by the CONTRACTOR shall be guaranteed against failure in proper use or operation caused by defective material, workmanship or design for a period of one (1) year from date of acceptance of the completed work. Upon receipt of notice from the owner of failure of any part or parts of the material or equipment during the guarantee period, the defective part or parts shall be replaced promptly with new parts by and at the expense of the CONTRACTOR.


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HVAC SYSTEM ADDENDUM SHEET

All revisions to this DGS subsequent to the issue of Rev Zero shall be recorded in this addendum sheet and shall be incorporated into the DGS in the next revision. Date

May 2009

Propos ed Revisio n

Remarks

In Clause # 1.0: Modification

Modify 1st Paragraph as: “This specification covers furnishing of all labor, materials, equipment, supervision, storage, and each and every item of expense necessary for the CONTRACTOR(S) to perform the engineering, design, procurement, installation, and start up of complete and operable, heating, ventilating and air conditioning (HVAC) systems for Substation, Satellite Instrument Shelters (SIS), Combined Substation and SIS Buildings, Workshop Buildings and any other building as described in this contract.”

Clause # 2.0(b): Deletion

Delete last sentence in this clause.

Delete following codes from the list of Codes and standards : “National Electrical Manufacturers A ssoci ation (NEMA)” NEMA 250:Enclosures for Electric Equipment (1000 Volts Maximum)

In Clause # 3.0 : Deletion /Add iti on

Delete the word Project in the 2nd Paragraph. Delete the following DGS from the list of Specifications: “6089- DGS- CU-005: Fill Fine Grading and Paving”. Add following DGS in the list of specifications: “DGS-MM-001

Electric Motors – Cage Induction and Synchronous

In Clause # 4.0: Modification

Modify last sentence of last paragraph of this clause as below: “In case of conflict, the order of precedence shall be as stated below: Takreer DGS-AU-063-Rev-1 May-2009 Printed 02-Jul-09 10:28:55

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HVAC SYSTEM Date

Propos ed Revisio n

1.

Equipment Data Sheets/Requisition

2.

This specification

3.

Industry Codes and Standards

Remarks

In Claus e # 6.0: Delete/Replacement

Delete first sentence in second paragraph and replace with: “VENDOR’s proposed quality system shall fully satisfy all the elements of ISO 9001 - 2000 and ISO 9004 – 2000 with due regard to ISO 19011.” In Clause # 10.0: Modi fic ation

Modify last sentence of this clause as below: “The system shall be designed for a minimum life of 30 years and 5 years uninterrupted operation”. In Clause # 10.1: Modification

Modify Wet Bulb temperature in Summer as “37 deg C”. In Clause # 10.2: Delete/Addition

Delete following from the Description given in 6th and 7th rows of1st Column of this table: “LPG F OD, ULG Buildings”. Add the new Indoor conditions, descriptions in row Nos 8 and 9 of this table in line with Basic Engineering Design Data (BEDD) for RRE as given below: Room

Summer Max ( C)

Winter Min C

Electrical Equipment Room (Substation)

24°

No Heating

35-70

Battery/UP S

24°

18°

35-70

Rack Equipment Room (SIS Building)

24°

24°

50

HVAC Equipment Room

30°

18°

35-80

Control Room/Administration Building

23°

23°

35-70


RH (%)

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HVAC SYSTEM Date

Propos ed Revisio n

Remarks

Office, Locker, P rayer, Kitchen, etc.

24°

24°

50

Electrical Room, Shop, Warehouse

24°

No Heating

35-70

Clinic, Laboratory, Mosque, Amenities Building, Conference Hall/Theater, Communications Building

23°

23°

Fire Station, Guard Houses, Analyser Shelters, Operator Shelters

24°

24°

3570

50

In Clause # 10.4: Delete/Addition /Replacement

Delete 5th paragraph: “The HVAC system for existing substation expansion shall be as described in Section 11.0.” Delete 8th paragraph: “The new Substation Buildings, existing substation expansion and SIS Buildings shall be provided with a 100% redundant (standby) AC unit.” Replace with: “The new Substation and SIS Buildings shall be provided with a 100% redundant (standby) AC unit.” In Clause # 11.1: Modific ation/Addit ion

Modify 1st sentence of this clause as below: “The Substation Building is served by two (2) AC systems, each sized at 100% of room total cooling requirement, one operating and one standby.” Add new sentence in this clause as below: “Condensing unit shall be provided with Sunshade”. In Clause # 11.2 Poin t No.1: Delete

Delete the Point No.1 from this clause. In Clause # 11.3: Modification/Deletion

Modify 1st sentence of this clause as below: Takreer DGS-AU-063-Rev-1 May-2009 Printed 02-Jul-09 10:28:55

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HVAC SYSTEM Date

Propos ed Revisio n

Remarks

“The building is served by two (2) AC systems, each sized at 100% of room total cooling requirement, one operating and one standby.” Delete last sentence of this clause. In Clause # 11.4: Deletion

11.4

EXPANSION TO EXIS TING SUBSTATION BUILDINGS

Delete this clause In Clause # 11.5: Modification/Deletion

Modify 1st sentence of this clause as below: “The building is served by two (2) AC systems, each sized at 100% of room total cooling requirement, one operating and one standby.” Delete last 2 sentences in this clause. In Clause # 11.6: Modification

Modify 1st sentence of this clause as below: “The building is served by two (2) AC systems, each sized at 100% of room total cooling requirement, one operating and one standby.” In Clause # 11.7: Deletion/Modification

Delete word (FOD) SIMILAR from the heading of this clause. In Clause # 11.8: Modification

Modify the heading of this clause as below: “ CONTROL ROOM/ADMIN.BUILDING/A NY OTHER BUILDING” In Clause # 11.9: Modification

Modify Heading of this clause as “OFFICE BUILDING/CONTROL ROOM” Modify the clause as below: Takreer DGS-AU-063-Rev-1 May-2009 Printed 02-Jul-09 10:28:55

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HVAC SYSTEM Date

Propos ed Revisio n

Remarks

“The control room and office spaces are maintained by HVAC systems as described in section 11.8”. In Clause # 11.10: Modifi catio n

Modify 1st sentence of this clause as below: “Upon detection of smoke or fire by the fire protection system, the AC Systems in the Substation buildings or SIS building shall be shut down via the fire alarm panel”. In Clause # 13.1b: Modif icati on /Deletion

Modify this clause as below and delete rest of the contents presently shown in the clause i.e. various AC system components and names of the vendors” All HVAC equipment and materials shall be new and be the latest products selected from the Manufacturer’s of repute and subject to COMP ANY Approval”. “

In Clause # 13.1c: Modification

Modify this clause as below: “The CONTRACTOR/VENDOR shall submit recommended Lubrication Schedule and Lubrication Material for each item in accordance with Project Specification, DGS-MU-004, Lubrication Requirements”. In Clause # 13.1d: Modification

Modify this clause as below: “All equipment and material shall be preserved in accordance with Specification, DGS-MU-002, Preservation and Export Packing”. In Clause # 13.2.1: Modi fic ation

Modify heading of this clause as below: “Packaged Air Conditioning System” In Clause # 13.2.5: Modi fic ation

Modify last sentence of this clause as below: “For battery rooms, fans shall meet Hazardous area classification requirements as applicable”. Takreer DGS-AU-063-Rev-1 May-2009 Printed 02-Jul-09 10:28:55

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HVAC SYSTEM Date

Propos ed Revisio n

Remarks

In Clause # 13.2.13: Modif icati on

Modify this clause as below: “Electric duct heater shall be a factory assembly with panel board meeting the requirements of IEC, shall be U. L. listed for zero clearance to combustibles, rated for use with air conditioning systems. Heating element shall be open coil, 80% nickel, 20% chromium, type resistance wire. Heater frames and terminal boxes shall be corrosion resistant steel with weatherproof construction, factory wired and ready for installation. Unit shall be complete with contactors and thermal cutouts for temperature protection, control transformer, disconnect switch, airflow switch to prove air flow, fuses, pilot lights, etc. All electrical devices shall be in compliance to IEC standards and UL listed and rated.” In Clause # 13.3b: Modification

Modify this clause as below: “ Electrical power supply for the HVAC equipment shall be from normal power supply for all buildings except Main Control Room which shall be on emergency supply”. In Clause # 13.4a: Modifi catio n

Modify this clause as below: “The battery room exhaust fan shall provide adequate ventilation to prevent accumulation of explosive gas. The Fan and Motor shall comply with the area classification”. In Clause # 13.4b: Modification

Modify this clause as below: “Condensers shall have suitable fin spacing to reduce the effect of sand clogging.”


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HVAC System

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