Copper Pipes - Insulation and Heat Loss

Heat loss to surrounding air from insulated copper tubes

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The heat loss from an insulated copper pipe or tube to the surrounding air can be found in the table below. The heat loss is based on a temperature difference of 55^oC (130^oF) with an insulation thickness of 25 mm (1 inch) and a conductivity coefficient of k = 0.043 W/m^oC (0.3 Btu in/ft²hr^oF).

Nominal bore		Heat loss for fluid inside pipe
(mm)	(inches)	(W/m)	(Btu/hr ft)
22	3/4	8	8
28	1	10	10
42	1 1/2	11.5	12
54	2	14.5	15
67	2 1/2	16	17
76	3	19	20

1 W = 3.4 Btu/hr
1 ft (foot) = 0.3048 m

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