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Pressure Drop in Steam Pipes
Steam pipes and pressure drop diagrams - imperial and metric units
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Pressure drop in steam pipes can be estimated with the diagrams below.
Imperial Units
The diagram is made for steam with pressure 100 psi. For other pressures use correction factors:
| Pressure (psi) | 0 | 5 | 10 | 30 | 60 | 90 | 100 | 110 | 150 | 200 | 250 | 300 |
| Factor | 6.9 | 5.2 | 4.3 | 2.4 | 1.5 | 1.1 | 1.0 | 0.92 | 0.70 | 0.55 | 0.45 | 0.38 |
- 1 lbs/hr = 1.26x10-4 kg/s
- 1 psi (lb/in2) = 6,894.8 Pa (N/m2) = 6.895x10-3 N/mm2 = 6.895x10-2 bar = 27.71 in H2O at 62oF (16.7oC) = 703.1 mm H2O at 62oF (16.7oC) = 2.0416 in mercury at 62oF (16.7oC) = 51.8 mm mercury at 62oF (16.7oC) = 703.6 kg/m2 = 0.06895 atm = 2.307 Ft. H2O
Metric Units
The diagram is made for steam with pressure 7 bar. For other pressures use correction factors:
| Pressure (bar) | 0 | 1 | 2 | 4 | 5 | 6 | 7 | 8.5 | 10 | 12 | 14 | 20 |
| Factor | 6.9 | 3.67 | 2.51 | 1.55 | 1.31 | 1.13 | 1.0 | 0.85 | 0.74 | 0.63 | 0.55 | 0.39 |
- 1 kg/h = 2.778x10-4 kg/s = 3.67x10-2 lb/min
- 1 bar = 105 Pa (N/m2) = 0.1 N/mm2 = 10,197 kp/m2 = 10.20 m H2O = 0.9869 atm = 14.50 psi (lbf/in2) = 106 dyn/cm2 = 750 mmHg
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Related Topics
- Pipe Sizing - Sizing steam and condensate pipes - pressure loss, recommended velocity, capacity and more
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