V32_HVAC_Systems.pdf

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SHELL NIGERIA EXPLORATION AND PRODUCTION

COMPANY

COMPANY Ltd.

Ltd.

Bonga FPSO Bonga FPSO Bonga FPSO Bonga FPSO

Plant Operating Procedures Manual Plant Operating Procedures ManualPlant Operating Procedures Manual Plant Operating Procedures Manual

Volume 32 Volume 32Volume 32 Volume 32 HVAC SYSTEMS HVAC SYSTEMS HVAC SYSTEMS HVAC SYSTEMS OPRM OPRM OPRM OPRM----200320032003-2003--0332-033203320332 Version: 1.2

This document is not confidential.

The Copyright of this document is vested in Shell Nigeria Exploration and Production Company Limited. All rights reserved. Neither the whole nor any part of this document may be reproduced, stored in any retrieval system or transmitted in any form or by any means (electronic, mechanical, reprographic, recording or otherwise) without the prior written consent of the copyright owner.

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OPRM-2003-0332 Page ii of ix 30-April-2006

Document Status Information

1.0. DOCUMENT CONTROL

1.1. Change History 1.1. Change History 1.1. Change History 1.1. Change History Date DateDate

Date VersionVersionVersionVersion AuthorAuthor AuthorAuthor Ref Ref Ref Ref Indicator IndicatorIndicator

Indicator Change DescriptionChange DescriptionChange DescriptionChange Description

30/09/04 1.0 ODL – First issue.

31/08/05 1.1 ODL – Amendments to Part 1

Section 1 Paragraphs 1.3.2 and 1.4.2. Amendments to Part 1 Section 2 Paragraphs 2.2.1, 2.3.1, 2.16.2, 2.16.3, 2.16.4, 3.4.4 and 3.5.1. Amendments to Part 2 Section 1 Procedure No 1/002: • Steps 5, 7, 13, and 14 removed Amendments to Part 2 Section 1 Procedure No 1/003:

• Steps 18 and 20 altered Amendments to Part 2 Section 2 Procedure No 2/001:

• Steps 7 and 9 altered Amendments to Part 2 Section 2 Procedure No 2/003:

• Step 4 removed • Step 5 altered

30/04/06 1.2 ODL – Amended to reflect

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OPRM-2003-0332 Page iv of ix 30-April-2006 The purpose of this document is to provide guidance on the safe, efficient and environmentally aware operation of the Hull and Topsides HVAC Systems.

It is one Volume within an overall suite of Volumes, which comprise the Bonga FPSO Plant Operating Procedures Manual (POPM). The full listing of Volumes is as follows:

Volume 1 Field and Facilities Overview Volume 2A Subsea Production Facilities Volume 2B Subsea Waterflood System Volume 2C Subsea Control System Volume 2D Flow Assurance Guidelines Volume 3 Oil Separation and Treating

Volume 4 Oil Storage, Handling and Ballast Systems Volume 5 Oil Metering and Export System

Volume 6 Vapour Recovery Compression System Volume 7 Field Gas Compression System

Volume 8 Gas Dehydration/Glycol Regeneration Systems Volume 9 Gas Export/Import/Lift Systems (incl Metering) Volume 10 Flare and Vent Systems

Volume 11 Produced Water Treatment System Volume 12 Waterflood System

Volume 13 Chemical Injection and Methanol Injection System (Hull and Topsides)

Volume 14 Fuel Gas System

Volume 15 Heating Medium System Volume 16 Drainage Systems

Volume 17 Sewage Treatment System Volume 18 Bilge and Sludge Systems Volume 19 Inert Gas System

Volume 20 Nitrogen Generation System Volume 21 Seawater System (Hull)

Volume 22 Fresh and Potable Water Systems Volume 23 Diesel Fuel System

Volume 24 Aviation Fuel System

Volume 25 Instrument and Utility Air System Volume 26 Hydraulic Power Systems (Hull)

Volume 27 Fire Protection Systems and Equipment (Hull and Topsides) Volume 28 Safety and Lifesaving Equipment

Volume 29 PSCS and ESS

Volume 30 Power Generation and Distribution Systems (Hull and Topsides) Volume 31 Black Start Procedures

Volume 32 Volume 32 Volume 32

Volume 32 HVAC SystemsHVAC SystemsHVAC Systems HVAC Systems

Volume 33 Deck Machinery and Mechanical Handling Systems (Cranes, etc) Volume 34 Telecommunications

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OPRM-2003-0332 Page v of ix 30-April-2006 This document provides a detailed description of the plant and equipment, which comprise the Hull and Topsides HVAC System, and includes step-by-step guidance on the operation of the system and its equipment, under both normal and abnormal operation.

4.0 4.0 4.0

4.0 TARGET READERSHTARGET READERSHTARGET READERSHTARGET READERSHIPIPIPIP

All SNEPCO staff, contractors and other third-party personnel who may be involved in the operation of the HVAC System onboard the Bonga FPSO. 5.0

5.0 5.0

5.0 SPECIAL NOTESPECIAL NOTESPECIAL NOTESPECIAL NOTE Not applicable. 6.0

6.0 6.0

6.0 ABBREVIATIONSABBREVIATIONSABBREVIATIONSABBREVIATIONS

The abbreviations used within this document are listed at the end of these introductory pages.

7.0 7.0 7.0

7.0 REFERENCE INFORMATION/SUPPORTING DOCUMENTATIONREFERENCE INFORMATION/SUPPORTING DOCUMENTATIONREFERENCE INFORMATION/SUPPORTING DOCUMENTATIONREFERENCE INFORMATION/SUPPORTING DOCUMENTATION

The primary reference/supporting documents, which have been either used or referred to in the development of this document, are listed at the end of these introductory pages. These are part of the available Operational Documentation that SNEPCO Offshore Operations (OO) has in place to support its day-to-day operations. These and many other documents are available within the SNEPCO Livelink System. Where appropriate, these documents have been cross-referenced within this document.

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OPRM-2003-0332 Page vi of ix 30-April-2006

Abbreviations

2oo2 Two-out-of-two 2oo3 Two-out-of-three

AHU Air Handling Unit

CCR Central Control Room

CER Central Equipment Room

CO2 Carbon Dioxide

DCS Distributed Control System DES Direct Engineering Services

DP Differential Pressure

EDG Emergency Diesel Generator

ESS Emergency Support System

FPSO Floating Production, Storage and Offloading

HMI Human/Machine Interface

HP High Pressure

HVAC Heating, Ventilation and Air Conditioning

IGG Inert Gas Generator

IR Infrared

kW Kilowatt

LCP Local Control Panel

LEL Lower Explosive Limit

LP Low Pressure

LQ Living Quarters

LV Low Voltage

MCC Motor Control Centre

MSB Main Switchboard

MSBR Main Switchboard Room

NSV North Sea Ventilation

OIM Offshore Installation Manager

Pa Pascall

PABX Telephone Exchange Room

PAC Package Air Conditioner

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OPRM-2003-0332 Page vii of ix 30-April-2006

SLD Single Line Diagram

SSDS Safety Shutdown System

TER Telecom Equipment Room

TR Temporary Refuge

UCP Unit Control Panel

UPS Uninterruptible Power Supply

VAV Variable Air Volume

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OPRM-2003-0332 Page viii of ix 30-April-2006

Reference Information/Supporting Documentation

Project Data

Project Data Project Data Project Data

Document No/Ref Document No/RefDocument No/Ref

Document No/Ref Document TitleDocument Title Document TitleDocument Title

BON-AME-3GN-J-16017-001

Programming Functional Specification Heating, Ventilation and Air Conditioning (HVAC) – Hull

BON-AME-3GN-H-00117-001

HVAC Design Philosophy

BON-AME-3PW-H-20117-001

HVAC D&ID Power Module Main Switch Room System

BON-AME-3PW-H-20117-002

HVAC D&ID Power Module Turbine Generator Rooms

BON-AME-3SS-H-20117-003

HVAC D&ID Starboard Subsea Auxiliary Switch Room

BON-AME-3CC-H-20117-004

HVAC D&ID Compressor Control Module

BON-AME-3CC-H-20117-005

HVAC D&ID Compressor Control Module Battery Room

BON-AME-3PW-H-20117-006

HVAC D&ID Power Module Battery Room

BON-AME-3SS-H-20117-007

HVAC D&ID Starboard Subsea Module Battery Room

BON-AME-3PP-H-20117-008

HVAC D&ID Port Process Module Water Laboratory

BON-AME-3GN-H-20117-009

HVAC D&ID Cofferdam Area Main Deck.

BON-AME-3GN-J-16017-001

Programming Functional Specification HVAC (Hull)

BON-AME-3GN-J-80017-001

HVAC Equipment and Ductwork Specification

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OPRM-2003-0332 Page ix of ix 30-April-2006 Vendor

VendorVendor

Vendor Document NumberDocument NumberDocument NumberDocument Number Document TitleDocument Title Document TitleDocument Title Direct Engineering

Services

BON/1MA1792/DIRECT/00000 2

Central Unit For Air Conditioner

Hipres BON/1SA1379/HIPRES/000001 M/Space Fans And

Dampers North Sea Ventilation D-6540-003 Technical Manual Direct Engineering Services

80471-MSL-01 to 012 HVAC Single Line Diagrams (HULL) North Sea

Ventilation

6540-PW-PID-001 P&ID Refrigeration Supply for Battery Room (PW) AHU

A-1770A/B North Sea

Ventilation

6540-PW-PID-002 P&ID Refrigeration Supply for Battery Room (PW) AHU

A-1775A/B Vendor

VendorVendor

Vendor Document NumberDocument NumberDocument NumberDocument Number Document TitleDocument Title Document TitleDocument Title North Sea

Ventilation

6540-SS-PID-001 P&ID Refrigeration Supply for Battery Room (SS) AHU

A-1771A/B North Sea

Ventilation

6540-SS-PID-002 P&ID Refrigeration Supply for Battery Room (SS) AHU

A-1776A/B North Sea

Ventilation

6540-CC-PID-001 P&ID Refrigeration Supply for Battery Room (CC) AHU

A-1772A/B North Sea

Ventilation

6540-CC-PID-002 P&ID Refrigeration Supply for Battery Room (CC) AHU

A-1777A/B North Sea

Ventilation

6540-PP-PID-001 P&ID Refrigeration Supply for Port Process Water Lab AHU A-1774A/B

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OPRM-2003-0332 Page x of ix 30-April-2006 HEMP Actions HEMP Actions HEMP Actions HEMP Actions No No No

No DescriptionDescriptionDescriptionDescription Control MeasureControl MeasureControl MeasureControl Measure ODL ActionODL ActionODL ActionODL Action 1 Check compressor

crankcase lube oil level in applicable procedures. Inadequate compressor lubrication and/or operator error.

Harm to operator, equipment damage, environmental impact.

Action: Write and incorporate applicable supplementary procedure for compressors crankcase lube oil level check and refer to this supplementary procedure where required.

Refer to Part 2 Section 2 Procedure No 2/002 Step 4.

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OPRM-2003-0332 Page xi of ix 30-April-2006

Document Status Information

Abbreviations

Reference Information/Supporting Documentation

Part 1

Part 1 Part 1 –

––

– Techni

Techni

Technical Description

Techni

cal Description

Section 1

Section 1 Section 1

Section 1 System OverviewSystem OverviewSystem OverviewSystem Overview Section 2

Section 2 Section 2

Section 2 System Description System Description System Description System Description –––– Hull HVAC Hull HVAC Hull HVAC Hull HVAC Section 3

Section 3 Section 3

Section 3 System Description System Description System Description System Description –––– Topsides HVAC Topsides HVAC Topsides HVAC Topsides HVAC

Part 2

Part 2 Part 2 –

––

– Operating Procedures

Operating Procedures

Section 1

Section 1 Section 1

Section 1 System Operating ProceduresSystem Operating ProceduresSystem Operating ProceduresSystem Operating Procedures Section 2

Section 2 Section 2

Section 2 Equipment Operating ProceduresEquipment Operating ProceduresEquipment Operating ProceduresEquipment Operating Procedures Section 3

Section 3 Section 3

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PART 1 TECHNICAL DESCRIPTION

Section 1 System Overview.

Section 2 System Description – Hull HVAC

Section 3 System Description – Topsides HVAC

Part 1 Technical Description

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Part 1 Technical Description.

Section 1 System Overview.

1.0 HULL HVAC SYSTEMS

The HVAC System consists of two main systems: the Hull Ventilation System and the Topsides Ventilation System.

1.1 Introduction

The Hull HVAC System comprises the following subsystems:

• Forward Space HVAC System

• Machinery Spaces Ventilation System

• Main HVAC System (Accommodation)

1.2 Forward Space HVAC System

1.2.1 Introduction

The forward fire pump rooms, forward foam room, forward lower void and the fresh air supply to Package Air Conditioner A-1713 are fitted with a forced ventilation system with Supply Fan K-1722 providing ducted air from the upper deck port side. The temporary refuge room, locker workshop, forward store, and port and starboard air locks are provided with a standalone air-cooled Package Air Conditioner (PAC) A-1713 to supply a mixture of outside air and recirculated air.

Surplus air is expelled through outlet ducts on the forecastle deck.

Air intakes and exhausts for the forward spaces forced ventilation system are fitted with pneumatically operated fire dampers, which are grouped and controlled by the Fire and Gas System.

The deck store on the port side is equipped with Exhaust Fan K-1721. Refer to 80471-MSL-11 HVAC SLD Upper Deck Forward.

1.2.2 Flow Summary

Supply Fan K-1722 provides fresh air directly to the following forward space areas:

• Forward Fire Pump Room 1

• Forward Fire Pump Room 2

• Forward Foam Room

• Lower Void

• Fresh Air to PAC A-1713

Each space vents to the forecastle through individual mushroom vents. Supply and vent trunks are fitted with fire dampers.

The fire pump rooms are also supplied with a combustion air inlet.

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PAC A-1713, which is located in the forward store, supplies the following areas:

• Temporary refuge room

• Locker workshop

• Forward store

• Port and starboard airlocks

Note: A-1713 is equipped with an inlet fire damper.

The port and starboard airlocks have individual vents fitted with fire dampers leading to mushroom vents on the forecastle deck above. The other three spaces have a common vent duct, leading to a single mushroom vent fitted with a fire damper. The deck store on the port side is equipped with independent Exhaust Fan K-1721 and an inlet louvre. The louvre is fitted with a fire damper.

1.3 Machinery Spaces Ventilation System

The machinery spaces, with the exception of those areas supplied by Air Handling Unit (AHU) 3 for the 2nd Deck main switchboard rooms, workshops and stores, are provided with a forced ventilation system.

The machinery spaces forced ventilation system consists of four sets of supply fans as follows:

• Non-reversible Supply Fans K-1731A/B are located in the machinery space 2nd Deck, starboard side

• Reversible Fans K-1732A/B are located in the machinery casing, main deck level

The fans provide ducted air to all machinery space areas at the various deck levels. Surplus air exhausts naturally through two outlet trunks in the casing on B Deck. Supply Fans K-1732A/B can be operated in the reverse direction from the Distributed Control System (DCS) to exhaust the machinery spaces, if necessary, in the event of fire or smoke.

The aft fire pump rooms are each fitted with supply fans as follows:

• Port fire pump room – K-1733A/B

• Starboard fire pump room – K-1733C/D

The Inert Gas Generator (IGG) room is classified as independent of the machinery spaces, and is supplied by Supply Fans K-1718A/B on C Deck.

All air intakes and exhausts for the machinery spaces forced ventilation system are fitted with pneumatically operated fire dampers, which are grouped and controlled by the Fire and Gas System.

Air Handling Unit 3 (A-1704) is located on the 2nd Deck of the machinery space and provides pre-conditioned fresh air to the LV switchboard rooms, workshops and stores.

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Refer to:

• 80471-MSL-03 HVAC SLD 2nd Deck Aft

• 80471-MSL-04 HVAC SLD Upper Deck Aft

1.3.2 Flow Summaries

Machinery Space Starboard Supply Fans K-1732A/B

The fresh air intake for the machinery space Starboard Fans K-1732A/B is through the intake trunk on D Deck and is fitted with pneumatic Fire Dampers 17-FD-253/254.

Machinery Space Port Supply Fans K-1731A/B

Port Fans K-1731A/B air intake is from the B Deck level of the starboard intake trunk and is fitted with Fire Dampers 17-FD-251/252. These supply fans operate continuously on a duty or standby basis.

Fresh air is supplied directly through trunking to all levels of the machinery space plus the following machinery space areas:

• Purifier room

• Hydraulic power-pack rooms

• Essential service generator room

• Incinerator room

General surplus air routes through the machinery space deck inlets to the louvre for the Machinery Space Casing 17-FD-255/256 on B Deck which is fitted with pneumatic fire dampers.

The machinery space rooms are provided with fans and dampers as follows:

• Essential Services Generator

The essential service generator room is fitted with two pneumatic fire dampers to isolate the room in the event of a fire or smoke ingress.

• Purifier Room

The purifier room supply air ducting is fitted with a pneumatic fire damper. Exhaust Fan K-1736 removes exhaust air from the purifier room to a safe location on B Deck. The fan is located in ductwork on the fourth deck and fitted with a pneumatic fire damper.

• Toilet and Welding Spaces

The machinery space toilet and welding spaces are supplied with Exhaust Fans K-1735 and K-1734, respectively.

Exhaust Fan K-1735 is located in the ceiling of the toilet and K-1734 is located on the wall of the welding space. Each fan is fitted with non-return flaps and exhausts through dedicated ducts into the machinery space casing on B Deck.

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• Aft Firepump Rooms

The port and starboard aft firepump rooms each have their own dedicated intake trunk on the port and starboard of B Deck.

Each firepump room has two 100% supply fans, each fitted with a fire damper. Port and starboard Firepump Room Supply Fans K-1733A/B and K-1733C/D respectively are located on the upper deck.

The exhaust from the aft firepump rooms passes through ductwork fitted with pneumatic fire dampers to mushroom vents on the upper deck.

• IGG Room

The IGG room is ventilated by Supply Fans K-1718A and K-1718B from mushroom vents on C Deck, passing into the IGG room through two pneumatic fire dampers. Used air is exhausted from the IGG room through a separate fire damper located at B Deck level.

• Foam/Water Mist Room

The foam/water mist room is ventilated by Supply Fan K-1719, which is fitted with a pneumatic fire damper located below the foam/water mist room.

Used air is extracted to vent below the foam/water mist room, which is fitted with a pneumatic fire damper, by Exhaust Fan K-1720.

• Emergency Diesel Generator (EDG) Room

The EDG room is ventilated by Supply Fans K-1704 and K-1705 through individual fire dampers. When the EDG starts, three additional exhaust fire dampers open automatically.

• Paint Store

The paint store is ventilated by Supply Fan K-1702 through a supply fire damper. Used air is exhausted via a separate fire damper.

• Chemical Locker

The chemical locker is ventilated by Supply Fan K-1701 through a supply fire damper. Used air is exhausted via a separate fire damper.

• Machinery Spaces Cofferdam

The machinery spaces cofferdam, below the accommodation, is provided with an inlet fire damper. Exhaust Fans K-1703A/B ventilate the cofferdam space passing to atmosphere through a common exhaust fire damper.

• LV Main Switchboard Room (MSBR), Workshops and Stores AHU A-1704

For a general introduction to the four main Air Handling Units: A-1702A/B, A-1703 and A-1704, refer to Paragraph 1.4.

Air Handling Unit A-1704, located in the machinery space 2nd Deck is a 100% duty, single fan unit dedicated to providing cooled fresh air to the machinery spaces LV MSBR, workshops and stores.

The system is designed to provide a mixture of outside air and recirculated air. The outside air is from a common riser shared with AHUs A-1702A/B and A-1703.

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On AHU A-1704 volume control dampers are provided on the return air and outside air inlets to ensure the correct ratio enters the units. Mixed air then passes through a bank of panel filters prior to cooling with chilled water.

Conditioned air is discharged from the fan into the supply plenum and is then transferred to the switchboard room areas, workshop and stores on the 2nd Deck by way of a supply duct and a number of wire-mesh discharge grilles. Recycled air from the spaces is returned to the AHU through a number of return air grilles. Air passes through the ducting and enters the mixing chamber section of AHU A-1704.

Recycled air from the LV MSBR passes through a fire damper before returning to the mixing chamber of the AHU.

• Package Air Conditioners

Standalone freshwater-cooled Package Air Conditioner PAC-1710 is located within the LV MSBR.

Standalone freshwater-cooled Package Air Conditioner PAC-1711 is located within the engineering workshop.

Standalone freshwater-cooled Package Air Conditioner PAC-1712 is located within the engineering store.

1.4 Main HVAC System

The Main HVAC System for the accommodation block and machinery spaces of the Bonga FPSO is designed to maintain a relative humidity and temperature as follows:

• Summer

− Outside Temperature 35°C Relative Humidity 85%

− Inside Temperature 23°C Relative Humidity 50%

• Winter

− Outside Temperature 20°C Relative Humidity 70%

− Inside Temperature 21°C Relative Humidity 65%

The spaces are maintained by the HVAC System controls at a positive pressure of 50Pa relative to the outside atmospheric pressure. This is achieved by manually adjusting the exhaust dampers during commissioning of the main HVAC System equipment, and also by modulating the return air dampers or pressure control dampers in the distribution ducting during service.

The air conditioning for the accommodation block and machinery spaces is divided into three areas.

• Main accommodation, supplied by AHUs A-1702A and A-1702B

• Central Equipment Room (CER), Central Control Room (CCR), data telecommunications room and Uninterruptible Power Supply (UPS) space, supplied by AHU A-1703

• MSBRs, workshops and stores, supplied by AHU A-1704

Note: This unit is treated as being within the machinery spaces HVAC.

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All four AHUs take their supply air from the same common inlet duct which has two 100% intakes: one on C Deck and one on B Deck, at the aft end of the accommodation block.

The salt eliminator/moisture removal coalescer facility is fitted between the fresh air intake louvres and the air handling unit.

The air pressure, temperature and humidity in the various areas are controlled by local control panels. However, the AHU temperatures are remotely monitored and can be adjusted on the DCS.

In addition to the ventilation from the main AHUs, there are also various areas and rooms within the accommodation which are also provided with dedicated ventilation systems. The areas and rooms are described in Paragraph 1.4.2.

Refer to:

• 80471-MSL-05 – HVAC SLD A Deck Aft

• 80471-MSL-06 – HVAC SLD B Deck Aft

• 80471-MSL-07 – HVAC SLD C Deck Aft

• 80471-MSL-08 – HVAC SLD D Deck Aft

• 80471-MSL-09 – HVAC SLD E Deck Aft

• 80471-MSL-10 – HVAC SLD E Deck Top Aft

1.4.2 Flow Summaries

Chilled Water System

The two 100% duty/standby Chilled Water Units A-1704A and B are located in the machinery spaces 3rd Deck level to serve the AHUs for the main HVAC System. The chillers are coupled to two 100% duty/standby Chilled Water Pumps P-1703A and B located on the 3rd Deck. These provide circulation of chilled water through the evaporators and common recirculation pipework. Cooling medium for the chillers is provided from the low-temperature Cooling Freshwater System, which is controlled independently from the HVAC System.

Chilled water is circulated through the cooling coils of the four main AHUs, each of which is fitted with a three-way temperature control valve. These temperature control valves allow water to pass through or bypass the respective AHU as necessary to maintain the desired temperature/humidity conditions of the supply air. Chilled water is also supplied to the respective PAC.

AHUs A-1702A and A-1702B

AHUs A-1702A and A-1702B, located in the A Deck air handling room, are 100% duty/standby units, with two supply fans each which provide pre-conditioned fresh air from the air inlet on the aft end of A Deck to the accommodation deck areas. The system is designed to provide a mixture of fresh and recirculated air. Fresh air is taken from a common riser shared with Air Handling Unit A-1703.

Volume control dampers are provided on the return and fresh air inlets to ensure that the correct air ratio enters the various AHUs. The mixed airflow then passes through a bank of panel filters prior to being cooled with chilled water.

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Conditioned air is discharged from the AHU fans to the supply plenum and is transferred to the deck areas by a number of duct branches. From the duct branches, the air enters the individual spaces through a number of constant-volume units, variable-volume units and cabin units complete with discharge grilles.

Where the air boxes are the variable-volume-type they are controlled by a local thermostat in the space, this drives the inlet damper closed in response to the space temperature falling below the predetermined set point.

The cabin units have the facility to have their airflow adjusted by a lever on the diffuser to best suit the needs of the individual occupants. This facility is not provided on the larger constant-volume units and variable-volume boxes.

Recycled air from the accommodation deck levels is returned to the AHUs through a number of return air grilles on each deck. Return air passes through the ducting and main riser and enters the plant room by way of a large mesh grille prior to entering the mixing chamber section of the AHUs.

CER, CCR, PABX and UPS Air Handling Unit (AHU) A-1703

Air Handling Unit A-1703, which is located in the A Deck air handling room, is a 100% duty unit, with a single fan, providing cooled fresh air from the fresh air inlet on the aft end of A Deck to the CER, CCR, PABX and UPS areas.

The system is designed to provide a mixture of fresh and recirculated air. The fresh air is taken from a common riser, which is shared with Air Handling Units A-1702A/B and A-1703. Volume control dampers are provided on the return and outside air inlet to ensure that the correct air ratio enters the units. The mixed air then passes through a bank of panel filters prior to being cooled by chilled water.

Conditioned air is discharged from the fans into the supply plenum and is transferred to the CER/CCR/PABX/UPS areas by way of a supply duct and a number of variable volume units complete with discharge grilles.

The variable-volume-type units are controlled by a local thermostat in the space, this drives the inlet damper closed in response to the space temperature falling below the predetermined set point.

Recycled air from the spaces is returned to the AHU via a number of return air grilles. Air passes through the ducting and enters the mixing chamber section of the AHU.

Package Air Conditioners

• Standalone air-cooled Package Air Conditioner PAC-1705 is located within the CER

• Standalone air-cooled Package Air Conditioner PAC-1706 is located within the CCR

• Standalone air-cooled Package Air Conditioner PAC-1707 is located within the PABX

• Standalone air-cooled Package Air Conditioner PAC-1708 is located within the UPS

• Standalone air-cooled Package Air Conditioner PAC-1709 is located within the Telecom Equipment Room (TER)

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In addition to being included in the main accommodation HVAC System, the following areas and rooms are provided with separate ventilation systems as described below.

• Galley

The galley is provided with fresh air Supply Fans K-1712A/B, Exhaust Fans K-1712A/B and five fire dampers (one supply damper from the AHU, plus galley hood supply and three exhaust dampers).

• Gymnasium

The gymnasium is provided with Exhaust Fan K-1711 and one exhaust fire damper.

• C Deck Smoking Lounge

C Deck smoking lounge is provided with Exhaust Fan K-1717 and one exhaust fire damper.

• A Deck Smoking Coffee Shop

A deck smoking coffee shop is provided with Exhaust Fan K-1706 and one exhaust fire damper.

• E Deck Hospital

E Deck hospital is provided with Exhaust Fans K-1714A/B and one exhaust fire damper.

• Accommodation Toilets

The accommodation toilets are provided with Exhaust Fans, K-1715A/B and one fire damper.

• A Deck Laundry Rooms

The A Deck laundry rooms are provided with Air Supply Fans K-1707A/B and one supply damper, and Exhaust Fans K-1708A/B with one exhaust fire damper.

• E Deck Battery Room

E Deck battery room is provided with Exhaust Fans K-1710A/B and one exhaust fire damper.

• Lift-shaft Space

The lift-shaft space is provided with Exhaust Fan K-1716, one fire damper on the natural supply and one exhaust fire damper.

• TER Battery Room

The battery room is provided with Exhaust Fans K-1710A/B and one exhaust fire damper. The fans operate under duty and standby control.

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2.0 TOPSIDES HVAC SYSTEMS

2.1 Introduction

The topsides HVAC System consists of the following systems:

• Power Module HVAC System

• Starboard Subsea HVAC System

• Compressor Control HVAC System

• Methanol and Chemical Cofferdam HVAC System

• Port Process Module Water Laboratory HVAC System

The enclosed areas of the topsides modules are equipped with HVAC Systems to maintain design conditions and ventilation rates.

Each enclosure has two dedicated air conditioning units, with 100% redundancy, positioned close to or within the enclosed area.

The HVAC plants consist of louvred inlets, filter/coalescer, DX-type cooling coil, air-cooled condenser, supply fan and dampers. The systems are equipped with local control panels and field mounted instruments and controls.

All systems have automatically operated shut-off dampers on air inlets and exhausts for isolation purposes.

Supply system design is based on approximately 80% recirculation air and the air inlets are located to minimise wind effect wherever possible.

In positively-pressurised areas, the air is exhausted to atmosphere by forced draught through pressure relief dampers. These pressure relief dampers are used to control the pressure of the enclosed area.

2.1.1 Battery Rooms

Battery rooms are positively pressurised by ventilation to ensure that there is no ingress of hazardous gasses from outside whilst the ventilation system is operational.

Positive room pressurisation is maintained by exhausting air from the room to atmosphere via pressure relief dampers. These pressure relief dampers are used to control the pressure of the room.

Gas-tight dampers are installed on the air inlet and exhaust on the HVAC System. These are controlled by the HVAC control panel, which interfaces with the Emergency Support System (ESS), and are closed following confirmed gas detection at the inlet dampers.

Battery rooms are equipped with duty and standby HVAC units to maintain room conditions. The HVAC Systems are supported by essential and emergency generators for continued operation in the event of a power failure.

Dedicated local control panels located in the adjacent control/switch room control the battery rooms HVAC Systems.

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2.1.2 Generator Turbine Rooms

Turbine areas are ventilated by ambient air, with negative flow through the rooms, to offset generator heat emission.

Duty and standby extract fans, with a filter/coalescer and shut-off damper on the air inlet, are installed in the turbine generator rooms.

If a turbine is shut down or trips, the relevant HVAC System will also shut down. The HVAC control panel for the main switchroom HVAC Systems controls the turbine generator HVAC Systems.

2.2 Power Module Main Switchroom

Refer to BON-AME-3PW-H-20117-001.

AHUs A-1770A/B, located on the power module main switchroom roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs.

The system is designed to provide a mixture of 20% fresh and 80% recirculated air to the power module main switchroom.

Fresh air is supplied to the individual AHUs through an inlet cowl and inlet damper to the mixing chamber, where it mixes with the return air. Volume control dampers are provided on the return and outside air inlet to ensure that the correct air ratio enters the units.

The mixed air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan. Cooled pressurised air from the supply fan passes through the outlet damper to the power module main switchroom common supply duct, sound attenuator, shut-off damper and a number of variable volume units with discharge grilles.

Recycled air from the power module main switchroom returns to the AHU mixing chamber section through return air grilles and return ducting.

2.3 Power Module Battery Room

AHUs A-1775A/B, located on the power module battery room roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs.

The system is designed to provide 100% fresh air to the power module battery room.

Fresh air is supplied to the individual AHUs through an inlet cowl and inlet damper to the mixing chamber, where it mixes with the return air. The air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan.

Exhaust air from the power module battery room passes to atmosphere through return air grilles and ducting.

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2.4 Turbine Generator Rooms

The following description is for Turbine Generator A, however the description for the remaining turbine generators is identical.

The system is designed to ambient air, with negative flow through the rooms, to offset generator heat emission.

Cool fresh air is drawn through an inlet grille before passing through a filter/coalescer to remove solid particles and water. From the filter/coalescer, the air passes through a sound attenuator and a fire damper before passing to the turbine generator room.

Extract Fans K-1776A/B, located on the roof of Turbine Generator Room A, remove the hot exhaust air. The hot exhaust air passes through an outlet grille and an outlet fire damper before passing to an exhaust fan suction filter. From the suction filter, the hot air is extracted to atmosphere through an outlet filter, outlet grill and sound attenuator.

2.5 Starboard Subsea Module Auxiliary Switchroom

Refer to BON-AME-3SS-H-20117-003.

AHUs A-1771A/B, located on the starboard subsea module auxiliary switchroom roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs.

The system is designed to provide a mixture of 100% fresh air to the starboard subsea module auxiliary switchroom.

Fresh air is supplied through a common inlet cowl before passing through individual shut-off dampers to the mixing chamber, where it mixes with the return air. The air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan. The cooled pressurised air from the supply fan passes through the outlet damper to the starboard subsea module auxiliary switchroom through a supply duct, sound attenuator, shut-off damper and a number of variable volume units with discharge grilles.

Exhaust air from the starboard subsea module auxiliary switchroom passes to atmosphere through return air grilles and ducting.

2.6 Starboard Subsea Module Battery Room

AHUs A-1776A/B, located on the starboard subsea module battery room roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs. The system is designed to provide 100% fresh air to the starboard subsea module battery room.

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Fresh air is supplied through a common inlet cowl before passing through individual shut-off dampers to the mixing chamber, where it mixes with the return air. The air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan. The cooled pressurised air from the supply fan passes through the outlet damper to the starboard subsea module battery room through a supply duct and shut-off damper.

Recycled air from the starboard subsea module battery room returns to the AHU mixing chamber section through return air grilles and return ducting.

2.7 Compressor

Control

Module

AHUs A-1772A/B, located on the compressor control module roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs.

The system is designed to provide a mixture of 20% fresh and 80% recirculated air to the compressor control module.

Fresh air is supplied to the individual AHUs through an inlet cowl and inlet damper to the mixing chamber, where it mixes with the return air. Volume control dampers are provided on the return and outside air inlet to ensure that the correct air ratio enters the units.

The mixed air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan. Cooled pressurised air from the supply fan passes through the outlet damper to the compressor control module via a common supply duct, sound attenuator, shut-off damper and a number of variable volume units with discharge grilles.

Recycled air from the compressor control module passes to the AHU mixing chamber section through return air grilles and return ducting.

2.8 Compressor Control Module Battery Room

AHUs A-1777A/B, located on the compressor control module battery room roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs. The system is designed to provide 100% fresh air to the compressor control module battery room.

Fresh air is supplied to the individual AHUs through an inlet cowl and inlet damper to the mixing chamber, where it mixes with the return air. The air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan.

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Cooled pressurised air from the supply fan passes through the outlet damper to the compressor control module battery room through a common supply duct, sound attenuator, shut-off damper and a number of variable volume units with discharge grilles.

Recycled air from the compressor control module battery room passes to the AHU mixing chamber section through return air grilles and return ducting.

2.9 Chemical and Methanol Tank Cofferdam

Extract Fan K-1780A, located in the starboard process module, maintains a negative pressure in the chemical tank area by extracting the air through an outlet shut-off damper and extract filters. The filtered extract air is vented to atmosphere through an outlet cowl fitted with a bird screen.

Extracted air is replaced by fresh air drawn in through an inlet cowl equipped with a bird screen. The air passes through a filter coalescer to remove solid particles and water from the air stream, before passing to the chemical tank area through an inlet shut-off damper before passing to the chemical tank area.

Extract Fan K-1780B located in the port process module maintains a negative pressure in the methanol tank area by extracting the air through an outlet shut-off damper and extract filters. The filtered extract air is vented to atmosphere through an outlet cowl fitted with a bird screen.

The extracted air is replaced by fresh air drawn in through an inlet cowl equipped with a bird screen. The air passes through a filter coalescer to remove solid particles and water from the air stream, before passing to the chemical tank area through an inlet shut-off damper before passing to the methanol tank area.

2.10 Port Process Module Water Laboratory

AHUs A-1774A/B, located on the port process module water laboratory roof, are 100% duty units providing pressurised air from the fresh air inlet on the AHUs. The system is designed to provide a mixture of 20% fresh and 80% recirculated air to the port process module water laboratory.

Fresh air is supplied through a common inlet cowl before passing through individual shut-off dampers to the mixing chamber, where it mixes with the return air. Volume control dampers are provided on the return and outside air inlet to ensure that the correct air ratio enters the units.

The mixed air then passes through a filter/coalescer to remove solid particles and water from the air stream. From the filter section, the air passes across a cooling coil with refrigerant passing through the coils before flowing through the AHU supply fan. The cooled pressurised air from the supply fan passes via the outlet damper to the port process module water laboratory through a supply duct, sound attenuator, shut-off damper and a number of variable volume units with discharge grilles.

Recycled air from the port process module water laboratory returns to the AHU mixing chamber section via return air grilles and return ducting.

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OPRM-2003-0332 Page 15 of 15 30-April-2006

2.11 Refrigeration

Systems

Each AHU is equipped with a dedicated refrigeration system, to cool the supply air. The following description is for the Power Module Main Switchroom Air Handling Unit A-1770A. The description for all other air handling units is identical, using the correcponding tag numbers.

Refer to Part 1 Section 3 Figure 3.2 for clarity when following the text.

Refrigerant gas is supplied from the discharge of Refrigerant Compressor A-1770A-K-02 to Condenser Coil A-1770A-HAC-01, which is cooled by the four Condenser Fans A-1770A-F-01/A to1770A-F-04 condensing the refrigerant gas to a liquid.

The liquid refrigerant passes from the condenser to a refrigerant receiver for storage. From the receiver the liquid passes through a drier and a sight glass to Solenoid Valve 17-XY-882.

This valve, which operates from LCP-1770, controls the flow of liquid refrigerant to Thermo Expansion Valves 17-TCV-880A/B. The thermo expansion valves control the expansion rate of liquid to gas in the evaporator (Cooling Coil A-1770A-HCC-01), thereby controlling the temperature of the mixed air in the air handling unit.

From the evaporator, the refrigerant gas passes through a suction filter to the suction of Refrigerant Compressor A-1770A-K-02, where it is compressed. The hot compressed gas passes a discharge filter and a check valve to the air-cooled condenser once more to complete the cycle.

Down stream of the compressor discharge is an offtake for the hot gas injection valve. This valve recycles hot discharge gas downstream of the thermo expansion valve to maintain the system integrity and flow during minimum flow conditions.

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Part 1 Technical Description.

Section 2 System Description – Hull HVAC.

1.1 Introduction... 3 1.2 Forward Foam Room... 4 1.3 Forward Firepump Rooms... 4 1.4 Temporary Refuge Room ... 4 1.5 Locker Workshop... 4 1.6 Forward Store... 4 1.7 Deck Store... 4 1.8 Lower Void... 5 1.9 Airlocks... 5 1.10 Control and Instrumentation ... 5 1.11 ESS and SSDS Interface... 6 1.12 Safeguarding ... 6

2.0 MACHINERY SPACES VENTILATION SYSTEMS ... 7

2.1 Introduction... 7 2.2 Machinery Space Ventilation ... 8 2.3 Aft Firepump Ventilation ... 9 2.4 Purifier Room Ventilation... 10 2.5 Welding Space and Toilet Ventilation... 10 2.6 Hazardous Chemical Store HVAC System... 11 2.7 Paint Store HVAC System... 12 2.8 Emergency Generator Room HVAC System... 12 2.9 IGG Room Ventilation... 13 2.10 Foam/Water Mist Tank Room in 2nd Deck... 14 2.11 Hydraulic Power-pack Rooms Ventilation ... 15 2.12 Essential Service Generator Room Ventilation ... 15 2.13 Incinerator Room Ventilation ... 16 2.14 Transformer Room Ventilation... 16

Part 1 Section 2 System Description – Hull HVAC

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Table of Contents (cont’d)

2.15 MSBR, Workshop and Store HVAC System (AHU3) ... 16 2.16 Control and Instrumentation ... 19 2.17 ESS and SSDS Interface... 22 2.18 Safeguarding ... 22

3.0 MAIN HVAC SYSTEM ... 23

3.1 Introduction... 23 3.2 Common Air Intake... 24 3.3 Chilled Water System ... 25 3.4 Accommodation HVAC System... 28 3.5 CCR, CER, PABX and UPS HVAC System ... 39 3.6 Control and Instrumentation ... 44 3.7 ESS Interface ... 51 3.8 Safeguarding ... 52

TABLE

Table 2.1 – Aft Accommodation Equipment ... 23 Table 2.2 – Chilled Water Inlet and Outlet Temperature Indicators ... 28

FIGURE

Figure 2.1 – HVAC Single Line Diagram Upper Deck Forward... 53 Figure 2.2 – HVAC Single Line Diagram 2nd Deck Aft ... 54 Figure 2.3 – HVAC Single Line Diagram Upper Deck Aft ... 55 Figure 2.4 – HVAC Single Line Diagram A Deck Aft... 56 Figure 2.5 – HVAC Single Line Diagram B Deck Aft... 57 Figure 2.6 – HVAC Single Line Diagram C Deck Aft... 58 Figure 2.7 – HVAC Single Line Diagram D Deck Aft... 59 Figure 2.8 – HVAC Single Line Diagram E Deck Aft... 60 Figure 2.9 – HVAC Single Line Diagram E Deck Top Aft... 61 Figure 2.10 – HVAC Single Line Diagram 3rd Deck Aft ... 62

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1.0 FORWARD

SPACE HVAC SYSTEM.

1.1 Introduction

The forward spaces are provided with the following HVAC equipment:

• K-1722 Forward Ventilation Supply Fan

• A-1713 Forward Space Package Air Conditioning (PAC)

• K-1721 Forward Store Room Exhaust Fan

Refer to Figure 2.1 or to 80471-MSL-11: HVAC SLD Upper Deck Forward.

1.1.1 Forward Space Supply Fan

Equipment Details

Tag Number: K-1722

Location: Port Forward Void Space Manufacturer: Thermatrol

Model: AF630/4/12/40

Driver Rating: 4kW

Capacity: 4600 litres/s

Forward Space Supply Fan K-1722:

• Fan Running 17-YZ-224A

• Fan Available 17-YZ-224B

• Remote Start/Stop Fan 17-YZC-224

Refer to BON/1MA1792/DIRECT/000002: Central Unit for Air Conditioner.

1.1.2 Forward Space PAC

Tag Number: A-1713

Location: Starboard Store

Manufacturer: APAC

Model: S110 CBX

Driver Rating: 4.6kW

A standalone air-cooled package air conditioner, with its own fire damper, is installed in the forward starboard store and supplies a mixture of outside air and recirculated air.

The package air conditioner has a hermetic compressor operating on R407C and a tube-type air-cooled condenser, which is cooled by fresh air from Condenser Fans A-1721-K-01A/B/C/D.

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1.2 Forward Foam Room

The forward foam room is equipped with forced air intake from Forward Space Supply Fan K-1722 through pneumatic Fire Damper 17-FD-176.

Exhaust air from the foam room vents to the forecastle deck through Fire Damper 17-FD-177.

1.3 Forward Firepump Rooms

The forward firepump rooms are equipped with forced air intake by Forward Space Supply Fan K-1722 through pneumatic Fire Dampers 17-FD-168/172.

Exhaust air from the forward firepump rooms is vented to the forecastle deck through Fire Dampers 17-FD-169 and 17-FD-173.

1.4 Temporary Refuge Room

PAC A-1713, which is located in the forward store, supplies the temporary refuge room. A-1713 is equipped with an inlet Fire Damper 17-FD-179.

Exhaust air from the temporary refuge room vents to the forecastle deck through Fire Damper 17-FD-175.

1.5 Locker

Workshop

PAC A-1713, which is located in the forward store, supplies the locker workshop. A-1713 is equipped with an inlet Fire Damper 17-FD-179.

Exhaust air from the locker workshop vents to the forecastle deck through Fire Damper 17-FD-175.

1.6 Forward

Store

PAC A-1713, which is located in the forward store, supplies the forward store. A-1713 is equipped with an inlet Fire Damper 17-FD-179.

Exhaust air from forward store vents to the forecastle deck through Fire Damper 17-FD-175.

1.7 Deck

Store

The deck store is equipped with an Exhaust Fan K-1721, venting through Fire Damper 17-FD-167 to the forecastle deck. The inlet is from the forward lifeboat area via a louvre and Fire Damper 17-FD-166.

1.7.1 Deck Store Exhaust Fan

Tag Number: K-1721

Location: Deck Store

Manufacturer: Thermatrol

Model: AF480/4/6/10 Driver Rating: 0.37kW

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Refer to BON/1MA1792/DIRECT/000002: Central Unit for Air Conditioner. Deck Store Exhaust Fan K-1721:

1.8 Lower

Void

The lower void is supplied with air from Forward Space Supply Fan K-1722 through a volume control damper.

Exhaust air from the lower void is vented to the forecastle deck through Fire Damper 17-FD-171.

1.9 Airlocks

PAC A-1713, which is located in the forward store, supplies port and starboard airlocks. A-1713 is equipped with an inlet Fire Damper 17-FD-179.

Exhaust air from port and starboard airlocks vents to each port and starboard of the forecastle deck through Fire Dampers 17-FD-174 and 17-FD-178.

1.10 Control and Instrumentation

1.10.1 Operation and Control

The forward spaces are equipped with a Package Air Conditioner A-1713, which operates independently of the Process Safety Control System (PSCS), except for an Emergency Support System (ESS) interlock.

Fans K-1721 and K-1722 in the forward spaces are controlled by the Safety Shutdown System (SSDS) and operate as single units. The operator can start and stop each fan from the Human/Machine Interface (HMI) and each fan has an ESS interlock.

The forward fire dampers are divided into groups as follows:

• Forward Firepump Room 1

• Forward Firepump Room 2

• Forward Foam Room

• Temporary Refuge Room

• Air Conditioned Spaces

• Deck Store

Fans and fire dampers are controlled from the SSDS. The HMI located in the Central Control Room (CCR) is the primary operator interface.

Forward space fans can be totally shut down by the ESS and, once stopped, all fans/dampers are prohibited from starting/opening until inhibits have been removed from the ESS.

The control panel incorporates this fan shutdown logic from signals received from the SSDS, with confirmation signals relayed back to the SSDS indicating that the required fan shutdown logic has been completed.

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The forward space ventilation system is fitted with pneumatic fire dampers at those points where ducting penetrates fire-rated walls or decks. These fire dampers have a rating at least equal to the barrier that they are designed to protect so as to maintain the integrity of the space.

The fire dampers are controlled via a signal from one or more of the following sources:

• Automatic closure by the PSCS

• Manual local operation of the solenoid valve

• Automatic failsafe closure by the melting of a fusible link

Air pressure is supplied to the fire dampers, which maintains them in the open position. The air supply passes through a solenoid valve, air trigger and quick-exhaust valve to the actuator for the damper, which at 4barg overcomes the return-spring force and at 5barg opens the damper.

When fully open, an operator arm on the actuator shaft operates the limit switch for open indication at the DCS. Local indication is also provided. If the fusible link melts at 70°C, the quick-exhaust valve opens a larger vent to release the air pressure and the damper closes within 0.5 to 2 seconds.

1.11 ESS and SSDS Interface

The ESS will give group or total shutdown commands to the forward HVAC panel depending on the fire and gas conditions.

The SSDS will receive the damper closed feedback signals.

1.12 Safeguarding

Fire and gas detectors continuously monitor the outside air intakes. The normal arrangement is three smoke detectors and two Infrared (IR) gas detectors, operating on a Two-out-of-three (2oo3) and Two-out-of-two (2oo2) voting system respectively. Both sets of smoke and gas detectors interface with the DCS. In addition, the forward airlock gives alarm indication on the DCS from a single smoke detector and IR gas detector located in the airlock.

Confirmed smoke or 60% Lower Explosive Limit (LEL) gas at the intakes results in the automatic closure of the fire dampers and stoppage of the forward space supply fan. These actions are essential to minimise the ingress of smoke or potentially explosive/toxic gas mixtures into the Temporary Refuge (TR) room.

Interface between the fire and gas control panel and HVAC control panel operates on a failsafe principle, ie HVAC supply and exhaust fan sets are shut down and fire dampers closed on loss of the control signal, loss of signal to the fire dampers or loss of back-up air supplies from the air accumulator vessel initiate damper closure. In addition, the fire dampers can also be closed manually.

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2.0 MACHINERY SPACES VENTILATION SYSTEMS

2.1 Introduction

The machinery spaces ventilation system provides fresh air to all machinery spaces, by means of independent mechanical ventilation systems.

Supply fans, two sets of non-reversible (K-1731A/B) and two sets of reversible (K-1732A/B), provide ducted air from separate intakes port and starboard at B Deck level to all machinery areas and levels. Surplus air naturally exhausts through an outlet trunk located in the machinery space casing on B Deck. All air intakes and exhausts provided for m spaces ventilation system are fitted with pneumatically operated fire dampers, which are grouped and controlled by the Fire and Gas System.

The machinery spaces ventilation systems are as follows:

• K-1731A and B Machinery Space Port Supply Fans A and B

• K-1732A and B Machinery Space Starboard Supply Fans A and B

• K-1733A and B Aft Firepump Room Port Supply Fans A and B

• K-1733C and D Aft Firepump Room Starboard Supply Fans C and D

• K-1736 Purifier Room Exhaust Fan

• K-1734 Welding Space Exhaust Fan

• K-1735 Toilet Exhaust Fan

• K-1701 Chemical Store Supply Fan

• K-1702 Paint Store Room Supply Fan

• K-1703A and B Cofferdam Exhaust Fans A and B

• K-1704 Emergency Generator Room Supply Fan

• K-1705 Emergency Generator Supply Fan

• K-1718A and B IGG Room Supply Fans A and B

• K-1719 Foam/Mist Room Supply Fan

• K-1720 Foam/Mist Room Exhaust Fan

• A-1704 AHU 3

• A-1710 MSBR Package Air Conditioner

• A-1711 Engineering and Electrical Workshop Package Air Conditioner

• A-1712 Store Room Package Air Conditioner

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Refer to the following:

• Figure 2.2 or to 80471-MSL-03: HVAC SLD 2nd Deck Aft

• Figure 2.3 or to 80471-MSL-04: HVAC SLD Upper Deck Aft

• Figure 2.4 or to 80471-MSL-05: HVAC SLD A Deck Aft

• Figure 2.5 or to 80471-MSL-06: HVAC SLD B Deck Aft

• Figure 2.6 or to 80471-MSL-07: HVAC SLD C Deck Aft

2.2 Machinery Space Ventilation

Machinery Space Supply Fans K-1731A/B and K-1732A/B are driven by 30kW independent electric motors, each designed to meet 100% of the designed load and supply a maximum of 186,300m3_{/hr of fresh air to the machinery spaces.}

2.2.1 Machinery Space Supply Fans

Tag Number: K-1731A/B

Location: Upper Deck and 2nd Deck

Manufacturer: HI PRES

Model: AQ-1400/578

Driver Rating: 30kW

Capacity: 96,000m3_/hr

Tag Number: K-1732A/B

Location: Upper Deck and 2nd Deck

Model: AQ-1400/578

Driver Rating: 30kW

Machinery Space Supply Fans K-1732A/B can be operated in the reverse direction from the Distributed Control System (DCS) to remove any smoke or fumes from the machinery spaces, when required.

Fan status indication on the DCS is provided as follows:

• Machinery Space Supply Fan K-1731A/B

− Fan Running 17-YZ-261A/262A

− Fan Available 17-YZ-261B/262B

− Remote Start/Stop Fan 17-YZC-261/262

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• Machinery Space Supply Fan K-1732A/B

− Fan Running Forward 17-YZ-263A/264A

− Fan Available for Forward Running 17-YZ-263C/264C

− Fan Running Reverse 17-YZ-263B/264B

− Remote Start/Stop 17-YZ-263A/264A

2.3 Aft Firepump Ventilation

Aft Firepump Supply Fans K-1733A/B (Port) and K-1733C/D (Starboard) are driven by 8.8kW independent electric motors each designed to meet 100% of the designed load, and supply 30,000m3/hr of pre-conditioned air to the aft firepump room.

2.3.1 Aft Firepump Supply Fans

Tag Number: K-1733A/B, K-1733C/D

Location: Machinery Space 2nd Deck

Model: AQ-800/380

Refer to BON/1MA1792/DIRECT/000002: Central Unit for Air Conditioner. Fan status indication is provided on the DCS as follows:

• Aft Port Firepump Supply Fan K-1733A/B

− Fan Running 17-YZC-265A/266A

− Remote Start/Stop Fan 17-YZ-265/266

• Aft Starboard Firepump Supply Fan K-1733C/D

− Fan Running 17-YZC-267A/268A

− Remote Start/Stop Fan 17-YZC-267/268

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2.4 Purifier Room Ventilation

The purifier room is supplied with fresh air through a trunk fitted with Fire Damper 17-FD-261.

Used air is removed from the purifier room via a dedicated exhaust trunk fitted with Fire Damper 17-FD-262 and Exhaust Fan K-1736, which discharges to atmosphere on B Deck.

2.4.1 Purifier Exhaust Fan

Tag Number: K-1736

Location: Purifier Room

Model: AQ-560/380

The purifier room exhaust fan normally operates continuously and fan status indication is provided on the DCS as follows:

2.5 Welding Space and Toilet Ventilation

The welding space in the engineering workshop and the toilet are provided with individual exhaust trunks.

Exhaust Fans K-1734 and K-1735, which are fitted with non-return flaps, ensure that bad odours and fumes are removed directly from these areas in the machinery space. The exhaust trunk terminates in the machinery space casing on B Deck at a safe location.

2.5.1 Welding Space Fan

Tag Number: K-1734

Location: Welding Space, Toilet

Model: ADW-400/C6 Driver Rating: 0.75kW

Capacity: 900/320m3_/hr

Refer to BON/1SA1379/HIPRES/000001: M/Space Fans and Dampers. Note: This fan normally operates continuously.

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2.5.2 Toilet Exhaust Fan Equipment Details

Tag Number: K-1735

Location: Welding Space, Toilet

Model: ADW-400/C6 Driver Rating: 0.75kW

Capacity: 900/320m3_/hr

Refer to BON/1SA1379/HIPRES/000001: M/Space Fans and Dampers. Note: This fan normally operates continuously.

2.6 Hazardous

Chemical Store HVAC System

Ventilation to the hazardous chemical store is taken from a fresh air inlet on the upper deck, which is fitted with Fire Damper 17-FD-281 to provide isolation on confirmed fire or gas detection.

2.6.1 Hazardous Chemical Store Supply

Fresh air for hazardous chemical store is supplied by one 100% duty supply fan. The used air and any chemical fumes pass through the exhaust trunk and Fire Damper 17-FD-282 to the outside atmosphere for safe dilution.

Equipment Details – Hazardous Chemical Store Supply Fan

Tag Number: K-1701

Location: Hazardous Chemical Store

Model: AF380/4/6/10EX Driver Rating: 0.37kW

The hazardous chemical store supply fan is controlled from a local control panel or DCS.

Indication and control for hazardous chemical store supply fan is provided on the DCS as follows:

• Supply Fan Remote Start/Stop 17-YZC-274

• Supply Fan K-1701 Available 17-YZ-274B

• Supply Fan K-1701 Running 17-YZ-274A

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2.7 Paint Store HVAC System

Ventilation to the paint store is taken from a dedicated fresh air inlet on the upper deck, which is fitted with Fire Damper 17-FD-279 to provide isolation on confirmed fire or gas detection.

2.7.1 Paint Store Supply

Fresh air for the paint store is supplied by one 100% duty supply fan. The used air and any paint fumes pass through the exhaust trunk and Fire Damper 17-FD-280 to the outside atmosphere for safe dilution.

Equipment Details – Paint Store Supply Fan

Tag Number: K-1702

Location: Paint Store

Model: AF380/4/6/10EX Driver Rating: 0.37kW

The paint store supply fan is controlled from a local control panel or DCS. Indication and control for the paint store supply fan is provided on the DCS as follows:

• Supply Fan Remote Start/Stop 17-YZC-275

• Supply Fan K-1702 Available 17-YZ-275B

• Supply Fan K-1702 Running 17-YZ-275A

2.8 Emergency Generator Room HVAC System

Ventilation to the emergency generator room is taken from dedicated fresh air inlets on A Deck and B Deck, which are fitted with a filter coalescer and Fire Damper 17-FD-288 to provide isolation on the confirmed detection of fire or gas.

2.8.1 Emergency Generator Room Air Supply

Supply Fan K-1704, located in Emergency Generator Room on A Deck, provides fresh air to the room when the generator is not running.

Supply Fan K-1705, located on B Deck, provides fresh air to the room for cooling purposes only when the generator is running. This is necessary so the emergency generator can be safely operated.

Equipment Details – Emergency Generator Room Supply Fans

Tag Number: K-1704

Location: Emergency Generator Room

Model: AF480/4/12/14, AF1250/6/8/28

Driver Rating: 0.55kW, 18.5kW