PIPe FReeze PROTeCTIOn AnD FLOW MAInTenAnCe
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H55838 2/12
Table 2 Pipe Heat Loss (q
b
) for Outdoor or buried Pipe (W/ft) for 1/2 to 3-1/2 inches
Insulation thickness
(
D
T)
Pipe diameter (IPS) in inches
(in)
°F
°C
1/2
3/4
1
1-1/4
1-1/2
2
2-1/2
3
3-1/2
0 .5
20
11
1 .0
1 .2
1 .4
1 .6
1 .8
2 .2
2 .5
3 .0
3 .4
50
28
2 .5
2 .9
3 .5
4 .1
4 .6
5 .5
6 .5
7 .7
8 .6
100
56
5 .2
6 .1
7 .2
8 .6
9 .6
11 .5
13 .5
16 .0
18 .0
150
83
8 .1
9 .5
11 .2
13 .4
14 .9
17 .9
21 .1
25 .0
28 .1
1 .0
20
11
0 .6
0 .7
0 .8
1 .0
1 .1
1 .3
1 .5
1 .7
1 .9
50
28
1 .6
1 .9
2 .2
2 .5
2 .8
3 .2
3 .8
4 .4
4 .9
100
56
3 .4
3 .9
4 .5
5 .2
5 .8
6 .8
7 .8
9 .1
10 .2
150
83
5 .3
6 .1
7 .0
8 .2
9 .0
10 .6
12 .2
14 .2
15 .9
1 .5
20
11
0 .5
0 .6
0 .7
0 .8
0 .8
1 .0
1 .1
1 .3
1 .4
50
28
1 .3
1 .5
1 .7
1 .9
2 .1
2 .4
2 .8
3 .2
3 .6
100
56
2 .8
3 .1
3 .5
4 .0
4 .4
5 .1
5 .8
6 .7
7 .4
150
83
4 .3
4 .8
5 .5
6 .3
6 .9
8 .0
9 .1
10 .5
11 .6
2 .0
20
11
0 .5
0 .5
0 .6
0 .6
0 .7
0 .8
0 .9
1 .0
1 .1
50
28
1 .1
1 .3
1 .4
1 .6
1 .8
2 .0
2 .3
2 .6
2 .9
100
56
2 .4
2 .7
3 .0
3 .4
3 .7
4 .2
4 .8
5 .5
6 .0
150
83
3 .7
4 .2
4 .7
5 .3
5 .8
6 .6
7 .5
8 .5
9 .4
2 .5
20
11
0 .4
0 .5
0 .5
0 .6
0 .6
0 .7
0 .8
0 .9
1 .0
50
28
1 .0
1 .2
1 .3
1 .4
1 .6
1 .8
2 .0
2 .3
2 .5
100
56
2 .2
2 .4
2 .7
3 .0
3 .3
3 .7
4 .2
4 .7
5 .2
150
83
3 .4
3 .7
4 .2
4 .7
5 .1
5 .8
6 .5
7 .4
8 .1
3 .0
20
11
0 .4
0 .4
0 .5
0 .5
0 .6
0 .6
0 .7
0 .8
0 .9
50
28
1 .0
1 .1
1 .2
1 .3
1 .4
1 .6
1 .8
2 .0
2 .2
100
56
2 .0
2 .2
2 .4
2 .7
2 .9
3 .3
3 .7
4 .2
4 .6
150
83
3 .1
3 .4
3 .8
4 .3
4 .6
5 .2
5 .8
6 .6
7 .1
4 .0
20
11
0 .3
0 .4
0 .4
0 .5
0 .5
0 .5
0 .6
0 .7
0 .7
50
28
0 .9
0 .9
1 .0
1 .1
1 .2
1 .4
1 .5
1 .7
1 .8
100
56
1 .8
2 .0
2 .1
2 .4
2 .5
2 .9
3 .2
3 .5
3 .8
150
83
2 .8
3 .0
3 .4
3 .7
4 .0
4 .4
4 .9
5 .5
6 .0
note:
Multiply the W/ft heat loss values by 3 .28 for W/m .
