Nominal
Aboveground Piping
Piping in Trenches on Piers
Pipe Sizes
Insulation Thickness
Insulation Thickness
(Inches)
(Inches)
(Inches)
____________
____________________
___________________________
less than 3
3.5
2.5
3 thru 4
4.0
3.0
5 thru 6
4.5
3.5
8 and larger
5.0
4.0
2.2.2
Mineral Fiber Pipe Insulation
Mineral fiber pipe insulation having an insulating efficiency not less than
that of the specified thickness of fibrous glass pipe insulation may be
provided in lieu of fibrous glass pipe insulation.
2.2.3
Calcium Silicate Pipe Insulation
Piping in Tunnels
Piping Under Piers
Nominal
Piping in Manholes
(Not in Trenches)
Pipe Sizes
Insulation Thickness
Insulation Thickness
(mm)
(mm)
(mm)
____________
____________________
____________________
less than 80
101.60
127.00
80 thru 100
114.30
152.40
125 thru 150
127.00
177.80
200 and larger
152.40
203.20
Piping in Tunnels
Piping Under Piers
Nominal
Piping in Manholes
(Not in Trenches)
Pipe Sizes
Insulation Thickness
Insulation Thickness
(Inches)
(Inches)
(Inches)
____________
____________________
____________________
less than 3
4.0
5.0
3 thru 4
4.5
6.0
5 thru 6
5.0
7.0
8 and larger
6.0
8.0
2.2.4
Cellular Glass Pipe Insulation
Cellular glass pipe insulation having an insulating efficiency not less
than that of the specified thickness of calcium silicate pipe insulation
may be provided in lieu of calcium silicate pipe insulation.
2.2.5
Mineral Fiber Pipe Wrap Insulation
Mineral fiber pipe wrap insulation having an insulating efficiency not less
than that of the specified thickness of fibrous glass pipe insulation may
be provided in lieu of fibrous glass pipe insulation for pipe sizes 250 mm
10 inches and larger.
2.3
MINIMUM THICKNESS OF INSULATION FOR PUMPED CONDENSATE RETURN PIPING
Minimum thickness of insulation for pumped condensate return piping shall
be as follows.
SECTION 15081N
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