Steam Pipes - Max Flow and Pressure Drops

Pressure drop and maximum allowable flow in steam pipes

Maximum Pressure Drop

MainsLaterals
Pressure (psi) 600 175 30 600 175 30
Pressure Drop
(psi per 100 ft pipe)
0.70 0.40 0.30 1.0 0.70 0.50

Maximum Flow

Nominal Pipe Size
(in)
Maximum Flow (lb/h) 10-3
MainsLaterals
3 6.2 2.7 0.9 7.5 3.6 1.2
4 12 5.7 2.5 15 7.5 3.2
6 33 16 6.6 40 21 8.5
8 63 32 14 76 42 18
10 108 58 25 130 76 32
12 158 87 39 190 115 50
14 217 117 54 260 155 70
16 300 166 78 360 220 100
18 227 101 300 130
20 132 170
  • 1 psi (lb/in2) = 6,894.8 Pa (N/m2)
  • 1 ft (foot) = 0.3048 m

Related Topics

  • Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more

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