Pressure Drop in Steam Pipes

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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:

• 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 62^oF (16.7^oC) = 703.1 mm H₂O at 62^oF (16.7^oC) = 2.0416 in mercury at 62^oF (16.7^oC) = 51.8 mm mercury at 62^oF (16.7^oC) = 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:

• 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 (lb_f/in²) = 10⁶ dyn/cm² = 750 mmHg

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