Heat Losses From Bare and Insulated Pipe

Heat Transfer Engineering

Heat Loss in Btu/h/ft Length of Fiberglass Insulation and Bare Pipe, ASJ Cover 150°F Temperature of Pipe Horizontal

NPS ½ ¾ 1 2 3 4 5 6 8
Thk HL BTU/h/ft length
Bare 36 44 54 67 75 92 110 131 165 200 235 299
½" 10 92 10 90 13 93 20 98 18 94 20 93 23 94 30 95 36 95 43 95 53 97 68 97
1" 7 86 8 87 9 86 11 88 11 87 13 87 15 88 18 88 22 88 27 89 32 89 38 89
1½" 5 84 6 84 7 84 8 84 9 85 10 85 10 84 14 85 17 86 20 86 23 86 28 8
2" 5 82 5 83 6 83 7 83 7 83 9 83 9 83 11 84 14 84 16 84 18 84 23 85

Vertical

Thk ½ ¾ 1 2 3 4 5 6 8
HL BTU/h/ft length
Bare 32 40 49 61 69 84 100 120 152 185 217 277
½" 9 92 10 90 13 93 19 99 18 95 20 94 23 94 30 96 35 96 43 96 52 97 67 98
1" 7 86 8 87 9 86 11 88 11 87 13 88 15 88 18 89 22 89 26 89 31 90 38 89
1½" 5 84 6 84 7 84 8 84 9 85 10 85 10 84 14 86 16 86 20 86 23 87 28 8
2" 5 83 5 83 6 83 7 83 7 83 9 83 9 83 11 84 14 84 16 85 18 85 23 85

Source: Courtesy Owens/ Corning

Notes: 80 deg. Ambient Temperature, 0 wind velocity, 0.85 Bare surface emmittance, 0.90 Surface emmittance, HL = Heat Loss (BTU/h/ft length), ST = Surface temperature (deg. F), Bare = Bare pipe, iron pipe size, Thk = Thickness

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