BP ANDREW AREA DEVELOPMENT.

Job No. F041G7001

HVAC DUCTWORK SPECIFICATION

Document No: 37AND-F041G7001-E-SE-0006-000

Contract BPA No: F050F0018

1.1.1.1 WGE Contract No.

Issued For
A 13/07/10
Review/Comment
REVISION

DATE

ORIGINATOR

CHECKED

APPROVED
DESCRIPTION
1.0 1.0 INTRODUCTION

This Specification Package outlines the requirements for the supply of a

HVAC Duckwork system capable supplying clean fresh air requirements
within the new LER Module, for the BP Andrew Area Development.

The technical requirements and equipment specification for this HVAC

package are based on the BP Andrew platform specifications.

The equipment specified within this document shall be developed by the

Vendor to Industry Standards and their original equipment specifications. To
accomplish this, the Vendor shall draw upon his existing, pre-engineered or
standard designs to satisfy the functional requirements. Equivalents will be
considered provided it can be shown to the satisfaction of the purchaser that
they meet or exceed the referenced standards or requirements.

1.1 General Requirements

This document is intended to provide sufficient information to enable the
Supplier to design, build and test new HVAC Duckwork system as identified
within this document.

The following principles are adopted:

• The new system will be supplied in accordance with standards listed in

section 2 of this document.
• The new system will be supplied in accordance with requirements listed in
section 5 of this document.
• The new system should have maximum versatility for modification, be
maintenance free (where possible), provide optimum operational
availability and reliability and incorporate a high degree of personal safety.

1.2 Definitions
The following definitions shall apply for use in this specification:

Purchaser WGE or their appointed agent.

Supplier/Vendor Manufacturer/supplier of the equipment
Must/shall Indicates a mandatory requirement.
Should Indicates a preferred course of action.
May Indicates one acceptable course of action.

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1.3 Roles and Responsibilities

The Purchaser shall:

• Review and approve all Supplier documentation in accordance with SDRL

accompanying this document.
• Assist Supplier as required.
• Attend Quality Assurance (QA) checks and Factory Acceptance Tests
(FAT) as required.
• Conduct a review of any special system design as advised by the Supplier.

Upon receipt of the Order, the Supplier shall:

• Nominate a Fixed Focal Point who shall act as primary point of contact for the
duration of the order.

• Revert with a complete working solution for design, manufacture, testing,

commissioning and documentation.

• Provide a complete plan from order receipt to commissioning and handover and
in particular, material delivery dates to site.

• Carry out Site Survey as required, ensuring any proposed new equipment can
by satisfactorily installed.

• Provide all documentation deliverables in accordance with supplied SDRL.

• Identify any exceptions and non-compliances to relevant standards, current

industry practice and legislation.

• Advise the Purchaser, prior to implementation within the design, of any special
system design.

• Provide and install all materials for the manufacture of new UPS system.

• Manage all modifications and apply a change control procedure that clearly
records all changes. The change control procedure shall be available for review
by the Purchaser.

• Carry out the FAT and SAT for the modifications to the satisfaction of the
Purchaser’s representative.

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 TABLE OF CONTENTS

1.0 1.0 INTRODUCTION.......................................................................................................2

1.1 General Requirements............................................................................................2
1.2 Definitions...............................................................................................................2
2
1.3 Roles and Responsibilities........................................................................................3
2.0 INTRODUCTION..............................................................................................................5

3.0 SCOPE OF SUPPLY.......................................................................................................5

3.1 General Description.....................................................................................................5
3.2 Free Issue Items of Equipment....................................................................................6
3.3 Requirements...............................................................................................................6
3.4 Testing.........................................................................................................................7
4.0 APPLICABLE CODES, STANDARDS AND REGULATIONS........................................7
4.1 Applicable Project Documents.....................................................................................8
4.2 Project Drawings..........................................................................................................8
4.3 International Standard..................................................................................................9
5.0 FABRICATION DRAWINGS............................................................................................9

6.0 GENERAL STANDARDS..............................................................................................10

6.1 General Requirements...............................................................................................10
6.2 HVAC Ductwork Material Thickness..........................................................................12
6.3 Hangers and Supports...............................................................................................12
7.0 DUCTWORK CONSTRUCTION....................................................................................12

8.0 DUCTWORK LEAKAGE TESTS...................................................................................13

9.0 IDENTIFICATION OF DUCTWORK & EQUIPMENT.....................................................13

10.0 DUCTWORK INSULATION.........................................................................................14

10.1 Material Selection....................................................................................................15
10.2 Types and Properties of Insulation..........................................................................15
10.3 Insulation Protection................................................................................................16
10.4 Insulation Procedures..............................................................................................16
10.5 Insulation Repair......................................................................................................17
APPENDIX A......................................................................................................................19
 BP ANDREW AREA DEVELOPMENT FEED.

37AND-F041G7001-M-SE-0000-000 – LER DUCKWORK

2.0 INTRODUCTION

This Specification together with the General Engineering Specification, attachments

and referenced documents defines the minimum standards for the fabrication and
installation of the HVAC Ductwork, associated fittings and ductwork supports.

In addition this Specification covers the installation of the free issued items of
equipment and installation of insulation to achieve fire rating and thermal protection
of ductwork, fire dampers and fire rated penetrations.

The HVAC Ductwork and associated fittings shall be installed as part of the internal
and external ventilation distribution systems serving the various Topsides Production
Utility Areas on a fixed offshore facility within the Caspian Sea.

This Specification shall be developed by the Topsides Contractor from the industry
standards and supporting documentation referenced below. To accomplish this
requirement the Topsides Contractor shall draw upon his existing, pre-engineered or
standard designs to satisfy the functional requirements specified herein.

3.0 SCOPE OF SUPPLY

This Specification, the reference documents therein and the attached Company’s
Standard Detail Drawings shall form the minimum scope for the fabrication and
installation of the Topsides HVAC Ductwork, all associated fittings and internal
ductwork hangers and supports together with the installation of all free issue items of
equipment, fire rating and thermal insulation protection of ductwork, fire dampers and
penetrations.

The Topsides Contractor shall fabricate, supply and install all external HVAC
Ductwork supports as detailed on the Company’s Structural Support Drawings.

3.1 General Description

The Topsides Contractor shall be responsible for the manufacturer, supply,

installation and leakage testing of the complete HVAC Ductwork system.

The HVAC Ductwork and associated fittings shall comprise of but not be limited to
the following components,

• Straight lengths of ductwork.

• Duct Flanges and Stiffeners.
• Ductwork fittings complete with internal turning vanes as
required.
• Spigot connections for grilles and diffusers.

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37AND-F041G7001-M-SE-0000-000 – LER DUCKWORK

• Access panels.
• Instrument mounts.
• Test holes with plugs.
• Inspection covers.
• Sealant, gasketing nuts, bolts and washers.
• Internal module Hangers and Supports.

It shall be the responsibility of the Topsides Contractor to inform the Company in

writing of any deviations from the fabrication requirements described within this
Specification or the documents referenced therein prior to ductwork fabrication.

The Company reserves the right to reject any deviations by the Topsides Contractor
when not complying with the above requirement.

3.2 Free Issue Items of Equipment

The following Free Issue Items of Equipment will be delivered to the fabrication yard
by the Company for installation within the HVAC Distribution Ductwork systems by
the Topsides Contractor.

• Packaged Air Handling Unit.

• Packaged Re circulation Air Handling Unit.
• Filters.
• Fans.
• Induct Electric Heaters.
• Weather Louvres.
• Various types of Dampers.
• Attenuators.
• Diffusers.
• Grilles.

3.3 Requirements

All HVAC Ductwork sizes, material thickness, routing, insulation type, etc. will be as
indicated on the Company’s HVAC General Arrangement layouts and Standard
Detail drawings.

The following minimum standards of manufacture shall be complied with.

3.3.1 General

Equipment and materials of construction shall be entirely suitable for the

environment within which all HVAC Ductwork will be located as described within this
Specification and the documents referenced therein.

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37AND-F041G7001-M-SE-0000-000 – LER DUCKWORK

The Topsides Contractor shall manufacture the HVAC Ductwork and fittings all in
accordance with DW/144 Class B or to The Sheet Metal and Air Conditioning
Contractors National Association Inc. (SMACNA) standards for the equivalent class
of HVAC Ductwork and fittings.

3.3.2 Package Interfaces

All HVAC Ductwork interconnecting free issued items of equipment shall be installed
in accordance with the Company’s Flange Drillings Detail Drawings, the Equipment
Manufacturers installation procedures and DW/144 or SMACNA installation
requirements.

3.3.3 Reliability

The HVAC Ductwork provides an important function on the platform, with respect to
the Health, Safety and Welfare of personnel. The Topsides Contractor shall
therefore provide material with a proven track record of high reliability and integrity
within the offshore industry.

3.3.4 Environmental Conditions

The environmental data scheduled in section 3.2 of the General Engineering

Specification No. BR-1GZZZZ-ME-SPE-0001 shall be used to establish the minimum
working conditions that the HVAC Ductwork will experience.

Supply Air serving enclosed areas will be filtered, heated or cooled prior to being
delivered into the respective space.

External HVAC Ductwork will be located within a saline and highly corrosive
environment.

3.4 Testing

HVAC Ductwork shall be tested in accordance with the minimum requirements as

detailed within A Practical Guide to Ductwork Leakage Testing DW/143, and as
described within section 7.0

All inspection and testing shall be in accordance with GP 32-10, GP 32-20 and GP 32-
48.

4.0 APPLICABLE CODES, STANDARDS AND REGULATIONS

As a minimum all equipment supplied as part of this package shall be manufactured,

tested and delivered in accordance with the relevant sections of the following
International Codes, Standards and Regulations, including addenda, supplements or
revisions thereto.

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37AND-F041G7001-M-SE-0000-000 – LER DUCKWORK

The use of other international standards equivalent to those listed below or in house
codes that are based on recognised international standards, will be considered,
subject to full documentary evidence of equivalent performance requirements. The
use of any alternative engineering standard to those listed below must be approved
by the Company, in writing, prior to work commencing.

These Codes, Standards and Regulations, together with all applicable Reference
Specifications are listed below.

It shall be the Topside Contractors responsibility to ensure his own compliance and
that of his sub-suppliers with all Codes, Standards, Specifications and Regulations.

Should any conflict occur as a result of applying the Specification with any Applicable
Codes, Standards and Regulations, the Topside Contractor shall refer conflict to the
Purchaser for resolution.

4.1 Applicable Project Documents

BR-1GZZZZ-ME-SPE-0001. General Engineering Specification

BR-CDZZZZ-MT-SPE-0007. General Coating Specification for Fabrication Sites.
Coating System No.D1.

4.2 Project Drawings

BR-1GZZZZ-HV-STD-0001.00. Flange Drilling Detail – Equipment.

BR-1GZZZZ-HV-STD-0002.00. Flange Drilling Detail – Ductwork.
BR-1GZZZZ-HV-STD-0003.00. Mesh Screen Detail.
BR-1GZZZZ-HV-STD-0004.00. Ductwork Wall Penetration – A0 or Non Fire Rated.
BR-1GZZZZ-HV-STD-0005.00. Ductwork Wall Penetration – A60 and H60 Fire
Rated.
BR-1GZZZZ-HV-STD-0006.00. Infra Red Gas Detector Mounting Detail –
Ductwork.
BR-1GZZZZ-HV-STD-0007.00. Ionisation Smoke Detector Mounting Detail –
Ductwork..
BR-1GZZZZ-HV-STD-0008.00. Diffuser Mounting Detail.
BR-1GZZZZ-HV-STD-0009.00. Temperature Transmitter Mounting Detail –
Ductwork..
BR-1GZZZZ-HV-STD-0010.00. Supply and Extract Grilles Connection Detail.
BR-1GZZZZ-HV-STD-0011.00. Access Door Detail – Fire Rated. (A60 & H60).
BR-1GZZZZ-HV-STD-0012.00. Access Door Detail – Proprietary Light Gauge.
BR-1GZZZZ-HV-STD-0013.00 Heavy Duty and A0 Fire Rated Access Door Detail.
BR-1GTSZZ-HV-DTL-0002.00 HVAC Typical Internal Duct Support Details.

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37AND-F041G7001-M-SE-0000-000 – LER DUCKWORK

4.3 International Standard

BS476 Part 7. Fire Tests On Building Materials And Structures-Method

Of Test To Determine The Classification Of The Surface Spread
Of Flame Of Products.
ISO/R 1182 Fire tests on building materials and structures. Non-
combustibility test for materials.
BS1449 Steel Plate, Sheets And Strip-Carbon And Manganese Plate,
Sheet And Strip-General Specification.
BS EN 12329 & Method For Specifying Electroplated Coatings of Zinc
12330. and Cadmium On Iron And Steel.
BS3958 Thermal Insulating Materials.
BS4872 Part 1 Specification For Approval Testing Of Welders When
Welding Procedure Approval Is Not Required.
Fusion Welding Of Steels.
BS EN ISO12241 Method For Specifying Thermal Insulating Materials On Pipes,
Ductwork And Equipment (In Temperature Range 100 Degree C
To + 700 Degree C)
BS EN 10225 Specification for Weldable Structural Steels for Fixed Offshore
Structures.
BSRIA Commissioning of Air Systems in Buildings AG3/89
DW143 : 1983 Ductwork Leakage Testing.

SMACNA The Sheet Metal and Air Conditioning Contractors National

Association Inc.

5.0 FABRICATION DRAWINGS

The Topsides Contractor shall submit the required copies of all HVAC Ductwork
Fabrication Drawings for review to the Company.

No manufacturing of ductwork shall proceed until the above review has been
completed by the Company.
The Topsides Contractor, prior to the commencement of drawing work shall review
all structural, architectural and services layouts and base their. Fabrication Drawings
on the Company’s latest HVAC General Arrangement layouts.

Fabrication Drawings shall contain, but not be limited to the following information.

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• Fully dimensioned installation layouts indicating maximum straight

lengths of ductwork, associated fittings, hangers and supports etc.
of each HVAC Ductwork Distribution system.
• Interconnection details of Free Issued Items of Equipment.
• Locations and dimensions of all internal hangers and supports.
• Schedule of Installed Weights for each system.

6.0 GENERAL STANDARDS

The HVAC Ductwork and associated fittings shall comply with the following
requirements.

6.1 General Requirements

All internal and external ductwork, associated fittings, stiffners, supports etc. shall be
manufactured in accordance with SMACNA equivalent standard as described below
and as scheduled within Appendix A.

The standards specified within SMACNA shall comply irrespective of material type or
gauge scheduled in Appendix A of this specification.

The HVAC Ductwork sizes stated on the HVAC General Arrangement layouts are
nominal external dimensions, the only exclusion will be for HVAC Ductwork Spigots
connecting Grilles and Diffusers where the sizes given will be clear inside duct
dimensions.

Straight sections of HVAC Ductwork shall be true rectangles and shall not be twisted
or deformed.

All standard fittings shall be provided in accordance with DW/144 or SMACNA and
conforming with the same material standard as specified for the respective HVAC
Distribution Ductwork, described below.

All bolts, nuts and washers shall be manufactured from 316L Stainless Steel.

Earth continuity of ductwork at flange joints between dissimilar materials, hangers

and supports shall be provided with insulating sets to prevent galvanic corrosion.

All earth continuity cabling from HVAC Ductwork and free issued items of equipment
to the structure shall be carried out by the Topsides Contractor.
Access panels, where shown on the HVAC General Arrangement layouts shall be of
the proprietary type and conform to the same material and construction standards of
the respective ductwork they are installed within.

Panels shall be 450mm x 400mm clear opening where possible, be of the removable
type and be complete with a safety edge sealing strip to protect personnel from the
cut steel edges.

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Each access panel shall be fitted with quick release attachments to a reinforcing
frame installed on the ductwork. The frame shall be made airtight by means of a
3.0mm thick gasket conforming to BS476 : Part 7.

Access panels within thermal or fire rated insulated ductwork shall be of double skin
insulated construction. Access panels within fire rated ductwork shall be installed to
maintain the fire rating of the ductwork.

Inspection openings shall be provided, where required with an independent air tight
cover plate. The cover plate shall be jointed to the opening surround with a
compound applied to the overlap and secured by means of a cross bar and screw or
of a type where the opening cover plate is bolted to the ductwork or flanged frame.

All flanges shall be drilled in accordance with the Company’s HVAC Standard Drilling
Detail drawings, referenced above.

Shoes holding grilles and diffusers shall have a 32.0mm self-flange and shall be site
drilled to suit the grille/diffuser manufacturers requirements.

13.0mm test holes complete with plugs shall be provided where required within the
ductwork to allow readings to be taken for system commissioning and balancing.

Test holes shall be located in accordance with the requirements of the BSRIA
manual Commissioning of Air Systems in Buildings AG3/89 at the following
locations:-

a) At fan inlets and outlets in the longest straight section of the

HVAC Ductwork.
b) At air heating coils both before and after the coil.
c) On the downstream side of volume control dampers in the longest
straight sections of the HVAC Ductwork

Test holes in fire rated ductwork shall be achieved with 25.0mm half sockets welded
to the ductwork, fitted with screwed metal plugs.

CE Marking
The Supplier shall be responsible for demonstrating compliance with all legislation,
regulations and ‘CE’ marking. All free issue equipment provided by the Purchaser will be
supplied with relevant CE certification. This information will be passed to the Supplier to
enable the Supplier to group all individual items as part of complete units, for ‘CE’ marking
purposes. The Supplier shall ensure that any grouping for ‘CE’ marking purposes does not
have a detrimental impact on the life cycle inspection and maintenance of an individual item of
equipment within a group e.g. increased testing, additional maintenance costs etc.

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37AND-F041G7001-M-SE-0000-000 – LER DUCKWORK

6.2 HVAC Ductwork Material Thickness

Material Thickness of HVAC Ductwork shall be as stated upon the Company’s HVAC
General Arrangement layouts and as scheduled within Appendix A attached.

6.3 Hangers and Supports

Hangers and supports shall not exceed a maximum spacing of 2500mm. The
Topsides Contractor shall be responsible for the co-ordination of the HVAC Ductwork
hangers and supports with all other services e.g. piping routes, cable racks and
supports etc.

HVAC Ductwork hangers and supports shall be installed to provide rigid support of
each ductwork distribution system. Hangers and supports shall be located not to
restrict access for installation and maintenance of any items of major equipment.

Internal HVAC Ductwork hangers and supports shall be of a proprietary support of

composite bolted construction, ‘Unistrut’ type or equal and approved by the
Company.

The Topsides Contractor shall be responsible for the co-ordination and installation of
all internal ductwork hangers and supports.

External HVAC hangers and supports shall be designed and co-ordinated by the
Company and manufactured and installed by the Topside Contractor.

The Topsides Contractor shall comply with the operation and transportation loads of
the installed HVAC Ductwork distribution and free issued items of equipment.

7.0 DUCTWORK CONSTRUCTION

All internal and external ductwork and associated fittings shall be manufactured from
grade 2, 316L stainless steel to BS 1449 1991 throughout.

All square, internal and rectangular lightweight ductwork up to 0.90mm thick shall
have "Pittsburgh Lock" or "Grooved Seam “ longitudinal seam joints typically as
Figures 1 shown in Appendix B

All joints shall be tightly formed and sealed with a suitable sealant during
manufacture.

Square and rectangular ductwork from 2.0mm thick and above shall be fully welded
along the complete seam.

Joints and stiffeners for rectangular HVAC Ductwork shall be manufactured from
stainless steel angle sections, for details see Appendix A attached.

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3.0mm thick gaskets shall be installed between flanges to provide an air tight seal.
Gaskets shall be of the non-toxic, non-flammable, vermin proof having a shore
hardness between 450 and 550 on the OO scale and complying to BS 476 parts 4 &
7.

8.0 DUCTWORK LEAKAGE TESTS

The HVAC Ductwork leakage test shall be performed on the completed system.

Testing procedures shall be in accordance with DW /143.

Permissible air leakage rate for class B ductwork having a maximum positive static
pressure limit of 1000 Pa and a maximum negative static pressure limit of 750 Pa
shall be 0.009 x p 0.65 litres per second per square metre of duct surface area.
The duration of any test shall not be less than 15 minutes. The test equipment
certified for accuracy shall be as indicated in fig. 2 of DW 143. After successful
completion of the tests, an air leakage test sheet shall be provided in accordance
with the Specimen of air leakage test sheet page 7
within DW /143.

Table 17. Air Leakage Rates.

Static Pressure Maximum Leakage of

Differential Ductwork
Medium Pressure Class B
Pa Litres / sec./ m2/ surface area
100 0.18
200 0.28
300 0.37
400 0.44
500 0.51
600 0.58
700 0.64
800 0.69
900 0.75
1000 0.80

No insulation shall be applied to any distribution systems until testing has been
successfully completed and accepted.

9.0 IDENTIFICATION OF DUCTWORK & EQUIPMENT

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All HVAC Ductwork shall be identified. Identification shall be located where it can be
easily seen. The symbols shall be located on the surface which faces the position of
normal access to the completed installation.

The symbols shall not be hidden from view by structural members, other ducts, plant
or other service distribution systems. The symbols shall be located where there is
adequate natural or artificial light.

Symbols shall be placed at any service and access points to the distribution system
including areas where the distribution system is reduced to a single duct. Symbols
shall be located frequently enough to avoid the necessity for duct routes to be traced
back
The colour coding shall be as described within the following table.
TYPE COLOUR BS. 4800
Conditioned Cooled Air Red and Blue 04E53 & 18E53
Heated Air Yellow 10E53
Exhaust / Extract / Pressure Grey AA009
Relief Air / Recirculation
Fresh Untreated Air Green 14E53
Laboratory Fume and Brown 06C39
Welding Bay Extract Air.

The direction of airflow shall be indicated by an equilateral triangle with one apex
pointing in the direction of airflow in an easily visible position. The triangle size shall
be 150mm length of side. It will only be necessary to provide the colour symbol.

Symbol triangles shall be secured by using self adhesive plastic or transfer with
water soluble backing. The surface on which the symbols are to be fixed shall be
smooth and clean.

The adhesion shall not deteriorate due to the surrounding atmosphere to ensure that
the symbols are permanently fixed. Purpose made plastic or metal labels may be
used as an alternative to the self adhesive plastic or transfers.

10.0 DUCTWORK INSULATION

Insulation requirements will be as indicated on the HVAC General Arrangement

Drawings. The following abbreviations will be used within the HVAC General
Arrangement layouts to identify the type and function of the respective insulation.

HC Thermal Insulation with Vapour Barrier.(hot or cold).

A60 Insulated to achieve fire rating of HVAC Ductwork, Fire Dampers
and Penetrations.
H60 Insulated to achieve fire rating of HVAC Ductwork, Fire Dampers
and Penetrations.

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A0 Fire Rated Ductwork, Un-insulated

M Mechanical Protection of Ductwork.

10.1 Material Selection

All insulation shall be resin bonded, foil faced mineral wool complying fully with the
relevant parts of BS 3958 and BS 5422.
Thermal insulation shall be of the non-combustible, free from toxic fumes and smoke
when heated, inorganic and fungal resistant, non-hygroscopic, low chloride content
and asbestos free.

All insulation applied to the outside surfaces of ducting shall be purchased with a
factory applied single side facing of aluminium foil laminate having a water vapour
permeance of 0.001 g/s MN.

The insulation facings shall have a minimum of Class 0 fire resistance surface to BS
476: Part 6 (Fire propagation test) and Class 1 surface spread of flame to BS 476:
Part 7.

The types and properties of the insulation shall be as scheduled below.

10.2 Types and Properties of Insulation

Type Density Minimum Minimum Format Remarks

Code Kg/m³ Thermal Thickness
Conductivity mm
W/mK

HC 45 0.033@ 50° 40 Rectangular Note 1

mean Slabs

A60 110 0.040 @ 50° 75 Fire Batts Note 2

mean

Note 1

The thermal insulation shall incorporate a reinforced foil faced vapour barrier as
described below.

Note 2

The insulation thickness stated within the above schedule is relevant to A60 fire
rated ductwork only and shall be applied in two separate layers, one layer of 50mm
thick and one layer of 25mm thick. Each layer shall be applied with the joints
staggered, vapour barrier, described below, shall also be applied

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10.3 Insulation Protection

0.70mm thick stainless steel protective cladding secured with self tapping screws
shall be installed around all external insulation, insulation within plant and low level
ductwork to a height of two metres (2.0M) finished floor level. Cladding required to
protect the insulation from environmental and mechanical damage.

Joints shall overlap and be sealed all as described below.

10.4 Insulation Procedures

Prior to applying insulation the surface of the stainless steel ductwork shall be
painted to prevent chemical reaction between surfaces.

The following methods of securing the insulation to the HVAC Ductwork shall be
used.

a) Wire mesh to secure the insulation shall be 1.2mm stainless steel.

b) Welded pins, stick pins and spring washers.
c) Screw fasteners shall be self-tapping stainless steel type
d) Non-flammable adhesive solutions as recommended by the
insulation manufacturer shall be used. The adhesive shall not
emit toxic fumes or smoke when heated.
e) Joint sealant tape shall be 100mm wide self adhesive aluminium
foil of a type and suitable thickness recommended by the
insulation manufacture.
10.4.1 Insulation Type HC (Heat Conservation)

All insulation shall be applied ensuring close contact with the ductwork surface to
which it is attached and all joints sealed. The insulation shall be fixed to the ducts
using two way contact adhesive solution and double pronged self adhesive pins.
Slabs of insulation shall be further secured by means of stainless steel bands set at
centres not greater than 230mm. All joints and overlaps shall be securely taped and
sealed to maintain a vapour barrier.

Duct supports shall be provided with suitably sized (to match thickness of insulation)
non-compressive, load bearing non-hygroscopic thermal inserts and the applied
insulation shall be abutted to these.

Longitudinal joints shall be staggered on large size ducting.

All joints, overlaps, abutments, cut or exposed edges and penetrations of the foil
facing shall be securely taped and sealed to maintain the integrity of the insulation
system.

High level unclad insulation only shall be further secured with wrapping the whole
with galvanised wire mesh netting retained by wire lacing.

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Where irregular areas and spaces occur which cannot be insulated with the
preformed insulation slabs, a mixture of granulated material (with the same thermal
conductivity) and adhesive shall be used.
Access doors shall be double skin construction incorporating thermal insulation and
raised fixing frame. (If applicable)

Where insulation would otherwise conceal inspection openings, test holes, damper
quadrants, linkages, labels and instrumentation fittings, the insulation shall be
shaped and cut to allow full access and taped or sealed to prevent fibre loss.

Where insulation has protective cladding requirements, the stainless steel cladding
covering the thermal insulation shall be installed with seams and laps arranged to
shed water. All joints in the cladding shall have a lap of 75 mm minimum and sealed
with non-setting mastic. The covering shall be secured with stainless steel self-
tapping screws at 150mm pitch.

A continuous vapour barrier is required on all insulated metalwork including flanges

and supports such that cold bridges are eliminated and interstitial condensation is
prevented. The insulation shall be carried over all flanges and be provided with
insulated covers for access to duct mounted equipment and ancillaries.

Vapour barriers shall be factory applied aluminium foil on a polyvinyl acetate coating
applied to the surface of the insulation.

Vapour barriers shall form a complete water tight seal around penetrations.

Aluminium tape shall form the final seal around all insulation joints.

10.4.2 Insulation Type Code A60 or H60 (Fire Protection)

All insulation shall be as described above for the (HC) insulation.

In addition to the ducts the insulation shall be applied to all fire dampers and fire
rated penetrations in an approved method to meet the required certified fire rating.

10.5 Insulation Repair

Any insulation repairs necessary shall be made in such a manner to ensure the
integrity of the insulation properties and vapour barriers, where included, are not
impaired.

The damaged insulation shall be trimmed back to the undamaged section in order
that preformed regular shaped insulation made from an identical material to the
original material, cut to the required size, can be refitted in the same manner as the
original insulation was fitted.

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Repairs to damaged insulation or to the insulation disturbed in making connection to

plant and/or ductwork shall be carried out as part of the works.

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APPENDIX A

DUCTWORK CONSTRUCTION DETAILS

Table 1 - Ductwork Installed Externally, Rectangular Construction.

Table 2 - Fire Rated Ductwork, Rectangular Construction.
Table 3 - Ductwork Installed Internally, Rectangular Construction.

TABLE 1 – DUCTWORK INSTALLED EXTERNALLY, RECTANGULAR

CONSTRUCTION
Heavy Gauge. Stainless Steel 316L
Duct Longest Side Sheet Max. Jointing Max Stiffener
Thickness Length Method Stiffener Size
Spacing
mm Mm mm mm mm
Up to and including 2.0 2400 30mm stainless Not Not
400 steel angle Required Required
401 to 800 inclusive 2.0 2400 50mm stainless 1250 50mm
steel angle stainless
steel
angle
801 to 1000 inclusive 2.0 2400 50mm stainless 1000 50mm
steel angle stainless
steel
angle
1001 to 1500 2.0 2400 50mm stainless 850 50mm
inclusive steel angle stainless
steel
angle
1501 to 2500 2.0 1250 50mm stainless 625 50mm
inclusive steel angle stainless
steel
angle
1. Joints, Stiffeners and Bolts same material as duct.
2. Duct length base on 2500 x 1250 sheet size.

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APPENDIX A, Contd.

TABLE 2 – FIRE RATED DUCTWORK, RECTANGULAR CONSTRUCTION

Stainless Steel 316L
Duct Longest Side Wall Max. Jointing Max Stiffener
Thickness Length Method Stiffener Size
Spacing
Mm mm mm mm mm
0 to 400 inclusive 3.0 2400 30mm stainless 1250 30mm
steel angle stainless
steel
angle
401 to 800 inclusive 3.0 2400 50mm stainless 1250 50mm
steel angle stainless
steel
angle
801 to 1000 3.0 2400 50mm stainless 1000 50mm
inclusive steel angle stainless
steel
angle
1001 to 1500 3.0 2400 50mm stainless 850 50mm
inclusive steel angle stainless
steel
angle
1501 and above 3.0 1250 50mm stainless 625 50mm
steel angle stainless
steel
angle
1. Fire Rated ductwork occurs both internally and externally.
2. Joints, Stiffeners and Bolts same material as duct.
3. Duct length base on 2500 x 1250 sheet size.

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APPENDIX A, Contd.

TABLE 3 - DUCTWORK INSTALLED INTERNALLY, RECTANGULAR

CONSTRUCTION
Light Gauge Stainless Steel 316L
Duct Longest Wall Max. Jointing Max Stiffener
Side Thickness Length Method Stiffener Size
Spacing
mm mm mm mm mm
Up to and including 0.90 2400 Not Required Not Not
400 Required Required
401 to 800 0.90 2400 50mm stainless 1250 50mm
inclusive steel angle stainless
steel
angle
801 to 1000 0.90 2400 50mm stainless 850 50mm
inclusive steel angle stainless
steel
angle
801 up to 1000 0.90 2400 50mm stainless 850 50mm
inclusive steel angle stainless
steel
angle
1001 to 1500 1.20 2400 50mm stainless 850 50mm
inclusive steel angle stainless
steel
angle
1501 to 2500 1.20 1250 50mm stainless 625 50mm
steel angle stainless
steel
angle
1. Joints, Stiffeners and Bolts same material as duct.
2. Duct length base on 2500 x 1250 sheet size.

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APPENDIX B

Figure 1 Pittsburgh Lock Seam

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