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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

• Pipe Sizing - Sizing of steam and condensate pipe lines - pressure loss, recommended velocity, capacity and more.

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

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