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# Steam Pipes - Pressure Drop vs. Steam Flow

## Steam pipes and pressure drop diagrams - imperial and metric units.

Pressure drop in steam pipes can be estimated with the diagrams below.

### Imperial Units

The diagram is made for steam with pressure 100 psi schedule 40 steel pipe. 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 0.92 0.7 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 - multiply the pressure drop with 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 0.85 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

## Related Topics

• ### Sizing of Steam and Condensate Pipes

Dimensions of steam and condensate pipe lines. Calculate pressure losses, recommended velocities, capacities and more.

## Related Documents

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• ### Saturated Steam - Properties - Imperial Units

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• ### Sizing Steam Pipes (kg/h)

Steam is a compressible gas where pipe line mass flow capacity depends on steam pressure.
• ### Sizing Steam Pipes (lb/h)

Steam is a compressible gas where the capacity of a pipe line depends on the size of the pipe and the steam pressure.
• ### Steam Flow Rate vs. Pressure Drop - Schedule 40 Pipe

Flow rate (lb/h) and pressure drop per 100 feet of pipe.
• ### Steam Leaks through Orifices

Steam leaks through orifices for pressures ranging 250 - 600 psi
• ### Steam Pipes - Max. Flow and Pressure Drop

Pressure drop and maximum allowable flow in steam pipes.
• ### Steam Pipes - Online Pressure drop Calculator

Calculate pressure drops in steam distribution pipe lines.
• ### Steam Pipes - Sizing

Sizing of steam pipe lines - major and minor loss in steam distribution systems.

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## Citation

• The Engineering ToolBox (2008). Steam Pipes - Pressure Drop vs. Steam Flow. [online] Available at: https://www.engineeringtoolbox.com/steam-pipe-pressure-drop-d_1129.html [Accessed Day Month Year].

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7.8.15

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