Heat Loss from Pipe Outdoors

Heat Transfer Engineering

Heat Loss from Piping Chart For Piping Intended to Be Installed Outdoors

Heat Loss from Piping

Insulation Type Insulation Factor Heat Loss per Inch Thickness
Based on K Factor @ 50°F Mean Temp.
(Btu/h • °F • ft2)
Glass fiber (ASTM C547) 1.00 0.25
Calcium silicate (ASTM C533) 1.50 0.375
Cellular glass (ASTM C552) 1.60 0.40
Rigid cellular urethane (ASTM C591) 0.66 0.165
Foamed elastomer (ASTM C534) 1.16 0.29
Mineral fiber blanket (ASTM C553) 1.20 0.30
Expanded perlite (ASTM C610) 1.50 0.375

 

Insulation
Thickness (in.)
∆T, °F
IPS
½ ¾ 1 2 3 4 6 8 10 12
Tubing Size (in.)
¾ 1
0.5
10 0.5 0.6 0.7 0.8 0.9 1.1 1.3 1.5 1.8 2.6 3.3 4.1 4.8
50 2.5 2.9 3.5 4.1 4.8 5.5 6.5 7.7 9.6 13.5 17.2 21.1 24.8
100 5.2 6.1 7.2 8.6 9.9 11.5 13.5 15.9 19.9 28.1 35.8 43.8 51.6
150 8.1 9.5 11.2 13.4 15.5 17.9 21.0 24.8 31.9 43.8 55.7 68.2 80.2
200 11.2 13.1 15.5 18.5 21.4 24.7 29.0 34.3 42.7 60.4 76.9 94.1 110.7
250 14.6 17.1 20.2 24.1 27.9 32.2 37.8 44.7 55.7 78.8 100.3 122.6 144.2
1.0
10 0.3 0.4 0.4 0.5 0.6 0.6 0.7 0.8 1.0 1.4 1.8 2.2 2.6
50 1.6 1.9 2.2 2.5 2.9 3.2 3.7 4.4 5.4 7.4 9.4 11.4 13.4
100 3.4 3.9 4.5 5.2 5.9 6.8 7.8 9.1 11.2 15.5 19.5 23.8 27.8
150 5.3 6.1 7.0 8.2 9.3 10.5 12.2 14.2 17.4 24.1 30.4 37.0 43.3
200 7.4 8.4 9.7 11.3 12.8 14.6 16.8 19.6 24.0 33.4 42.0 51.2 59.9
250 9.6 11.0 12.6 14.8 16.7 19.0 22.0 25.6 31.4 43.6 54.9 66.9 78.2
1.5
10 0.3 0.3 0.3 0.4 0.4 0.5 0.5 0.6 0.8 1.0 1.3 1.4 1.8
50 1.3 1.5 1.7 1.9 2.2 2.4 2.8 3.2 3.9 5.3 6.6 8.0 9.3
100 2.7 3.1 3.5 4.0 4.5 5.1 5.8 6.7 8.1 11.1 13.8 16.7 19.5
150 4.3 4.8 5.5 6.3 7.1 7.9 9.1 10.4 12.6 17.2 21.5 26.0 30.3
200 5.9 6.7 7.6 8.7 9.8 11.0 12.5 14.5 17.5 23.8 29.7 36.0 41.9
250 7.8 8.7 9.9 11.4 12.8 14.4 16.4 18.9 22.8 31.1 38.9 47.1 54.8
2.0
10 0.2 0.2 0.3 0.3 0.4 0.4 0.4 0.5 0.6 0.8 1.0 1.2 1.4
50 1.1 1.3 1.4 1.6 1.8 2.0 2.3 2.6 3.1 4.2 5.2 6.3 7.3
100 2.4 2.7 3.0 3.4 3.8 4.2 4.8 5.5 6.5 8.8 10.9 13.1 15.2
150 3.7 4.2 4.7 5.3 5.9 6.6 7.5 8.5 10.2 13.7 17.0 20.4 23.6
200 5.2 5.8 6.5 7.4 8.2 9.1 10.3 11.8 14.1 19.0 23.5 28.2 32.7
250 6.8 7.5 8.5 9.6 10.7 11.9 13.5 15.4 18.5 24.8 30.7 36.9 42.7
2.5
10 0.2 0.2 0.2 0.3 0.3 0.3 0.4 0.4 0.5 0.7 0.8 1.0 1.2
50 1.0 1.1 1.3 1.4 1.6 1.8 2.0 2.3 2.7 3.6 4.4 5.2 6.0
100 2.2 2.4 2.7 3.0 3.3 3.7 4.1 4.7 5.6 4.7 9.1 10.9 12.6
150 3.4 3.7 4.2 4.7 5.2 5.8 6.5 7.3 8.7 11.5 14.2 17.0 19.6
200 4.7 5.2 5.8 6.5 7.2 8.0 9.0 10.2 12.1 16.0 19.6 23.5 27.1
250 6.1 6.8 7.5 8.5 9.4 10.4 11.7 13.3 15.8 20.9 25.7 30.7 35.4
3.0
10 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.4 0.5 0.6 0.7 0.9 1.0
50 1.0 1.1 1.2 1.3 1.4 1.6 1.8 2.0 2.4 3.1 3.8 4.5 5.2
100 2.0 2.2 2.4 2.7 3.0 33 3.7 4.2 4.9 6.5 7.9 9.4 10.8
150 3.1 3.4 3.8 4.3 4.7 5.2 5.8 5.6 7.7 10.1 12.3 14.7 16.8
200 4.3 4.8 5.3 5.9 6.5 7.2 8.0 9.0 10.7 14.0 17.0 20.3 23.3
250 5.7 6.2 6.9 7.7 8.5 9.4 10.5 11.8 13.9 18.3 22.3 26.5 30.5

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