Download MECHANICAL AND ELECTRICAL TECHNICAL

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Date:
SGJ
June 2012
FHPP
The Contractor is to state on the Summary of Tender the name of the firm or firms to whom the
insulation work wilt be sub-contracted. The firm selected must be of good repute, and a member of
the Thermal Insulation Contractors Association.
All services are to be insulated in the following manner.
(a)
Chilled Water Pipework generally
To be insulated with rigid preformed sections of “Kingspan Kooltherm Phenolic Foam” or
“Knauf Crown Glassfibre” or "Rockwool Rockfibre", each having a factory applied reinforced
aluminium foil facing material, or equal and approved. Finish to be Class 'O' as specified by
the Building Regulations, Approved Document B. Sections are to be close-butted, and all
longitudinal and circumferential joints are to have an overlap of facing material of not less
than 50 mm. Overlaps and butt joints to be well sealed with an adhesive or self-adhesive foil
tape approved by the insulation manufacturer and conforming to the Class '0' requirements.
Sections are to be taped into mitred lengths to run in uniform thickness around all bends,
sets, and tees. Vapour barriers are to be maintained thorough.
(b)
External Chilled Water Pipework
External pipework and fittings are to be insulated as for chilled water pipework generally, but
with the following further requirements.
The insulation is to be finished with a covering of Aluzinc 0.6mm Thick “Stucco” finish metal
cladding fitted so as to have joints beneath to shed water and with all valves and flanges
fitted with lined removable purpose made metal boxes, with quick release metal toggle
fasteners.
Cladding to be secured by self-seal pop rivets.
It should be noted that the chilled water flow and return pipework external to the Plantroom is to be
electrically trace heated as specified elsewhere, and the insulation sections, support brackets, etc.
are to allow sufficient space for this. Sections are to be close-butted, and all longitudinal and
circumferential joints are to be sealed by having overlap of facing materials of not less than 50 mm
sealed with an adhesive. Alternatively all butt joints sealed with Idenden T303 aluminium foil
adhesive tape as approved by the Insulation manufacturer to form a complete vapour barrier and
weathering seal.
Sections are to be formed into mitred lengths to run in uniform thickness around all bends, sets, and
tees.
At all pipe support brackets (Kooltherm or similar), high density pipe insulation support units, of a
thickness equal to the pipe insulation thickness, are to be installed, with the pipe clips installed over
the weatherproof finish. Insulation sections are to be close-butted to these units, sealed with foil
faced Class”O”tape and the weatherproof finish taken over the joints, with the completed work giving
a reliable vapour-proof and weather resistant finish.
Flanged joints are to be insulated with oversized insulation sections and site-cut rigid slab sections
with the weatherproof finish neatly dressed over the complete assembly, all sealed in accordance
with the manufacturer's recommendations. All external valves, including metering stations, are to be
insulated with 50 mm flexible mineral mat (Ductwrap) covered in Bright Class '0' faced foil with all
joints taped to maintain the vapour seal around the valve and the adjacent pipework. The valves and
flanges are to have a removable 0.6 mm Stucco Aluzink (Dobelshield) box which is to have an
internal insulated lining with vapour seal, to avoid damage to the valve insulation when the box is
removed and re-fitted.
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