Waste of Fuel Per Year by Heat Loss From 1 Foot of Pipe
(Steam at 100 PSI / Ambient Temp. 60º F.)

Pipe Size

BTUs/Hr. Loss

Working Hours

Equivalent Pounds of Fuel

Coal

Oil

Uninsulated

Insulated

Uninsulated

Insulated

1"

326

2000

80

20

40

10

6000 240

60

120 30
8400 340 85 170 43

1½"

447

2000

112

28

56

14

6000 336 84 178 42
8400 470 117 235 59

2"

550

2000

136

34

68

17

6000 408 102 204 51
8400 508 127 254 64

3"

778

2000

200

50

100

25

6000 600 150 300 75
8400 840 210 420 105

4"

978

2000

220

55

110

28

6000 660 165 330 88
8400 1020 255 510 128