Manual

Item no.
Temperature range in °F
120 to 210 300 to 575 750 to 930
Equivalent length in (ft)
1 Flanges for pressure stages PN 25 to PN 100
1.1 Uninsulated for pipes
1.1.1 In buildings 70 °F
NPS 2 10 - 16 16 - 36 30 - 49
NPS 4 13 - 23 23 - 52 43 - 52
NPS 6 13 - 30 23 - 56 56 - 98
NPS 8 16 - 36 33 - 85 66 - 121
NPS 12 20 - 52 39 - 121 82 - 187
1.1.2 In the open air 32 °F
NPS 2 23 - 36 30 - 52 39 - 62
NPS 4 30 - 46 43 - 75 59 - 92
NPS 6 36 - 59 46 - 95 72 - 121
NPS 8 43 - 79 59 - 125 89 - 151
NPS 12 52 - 105 69 - 177 105 - 226
NPS 16 72 - 102 92 - 174 144 - 223
NPS 20 82 - 105 102 - 171 157 - 226
1.2 Insulated in buildings 70 °F and in the open air 32 °F for pipes
NPS 2 2.3 - 3.3 2.3 - 3.3 3.3 - 3.6
NPS 4 0.3 - 3.3 2.6 - 3.9 3.6 - 4.6
NPS 6 2.6 - 3.6 2.6 - 4.3 4.3 - 5.2
NPS 8 2.6 - 4.3 3 - 4.6 4.3 - 5.6
NPS 12 2.6 - 4.6 3.3 - 5.2 4.6 - 6.2
NPS 16 3.3 - 4.6 3.6 - 5.2 5.2 - 6.2
NPS 20 3.6 - 4.3 3.6 - 5.2 5.2 - 5.9
2 Fittings for pressure stages PN 25 to PN 100
2.1 Uninsulated for pipes
2.1.1 In buildings 70 °F
NPS 2 30 - 49 52 - 95 89 - 128
NPS 4 49 - 69 79 - 151 138 - 207
NPS 6 52 - 92 85 - 207 190 - 295
NPS 8 69 - 115 121 - 269 240 - 354
NPS 12 95 - 167 164 - 381 348 - 581
NPS 16 118 - 197 194 - 446 413 - 676
NPS 20 151 - 249 246 - 558 518 - 876
3.3.11 Equivalent pipe length for flanges & valves
Reference values for plant related thermal bridges (table A14 - VDI 2055)
3.3 Usage tables
164