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The Surface to be insulated will be cleaned from
rust ,dirt ,grease ,oil etc and dried.
Metal finish will be secured over insulation to minimize direct
contact between surface to be insulated and outer metal cladding
.Joints will be vapour tight and expansion joints provided on
pipelines will allow to allow expansion of pipes to avoid
cracking.The spacing for expansion joints will be
| Pipe Temperature |
Spacing of Insulation
(Expansion Joints) |
| Upto 400
0 c |
3 M |
| Above 400
0 c |
2 M (All joints will be
staggered) |
Insulation will be secured to pipes by
tying circumferential wires of 1 mm to 1.6 mm. (19 to 16 SWG)
spacing 450 mm and ends will be pressed into insulation.
Insulation on vertical piping will be supported by metal rings
or studs at 3 M intervals & above each expansion joint.
The Multiple layer of insulation will be applied such that butt
joints of one layer do not coincide with those of the next
layer. The final outer layer of insulation will be covered by
galvanized wire netting stitched with suitable wire and anchored
by tying wires.
Protrusion through insulation such as pipe clamps, support of
pipings ,Instrument takeoffs ,etc will be insulated as per
adjacent insulation.
Aluminum foil will be screwed with self tapping screws on
longitudinal joints with 50 mm overlapping .The Overlapping
joints will be sealed to make it weather proof. Protrusion
through insulation such as pipe clamps, support of pipings
,instrument takeoffs etc will be insulated as per adjacent
insulation.
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