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Hot Water Heating Systems - Pressure Loss in Steel Pipes

Pressure loss nomogram for hot water steel pipes.

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Pressure loss in hot water steel piping systems can be estimated from the nomogram below:

Download Water Heating Nomogram as pdf file

The heat flow is based on temperature difference 20^oC.

1 Pa = 10^-6 N/mm² = 10^-5 bar = 0.1020 kp/m² = 1.02x10^-4 m H₂O = 9.869x10^-6 atm = 1.45x10^-4 psi (lbf/in²)
1 kW = 1,000 Watts = 3,412 Btu/h = 737.6/550 British hp = 1.341 British hp = 10³/9.80665 kg_f m/s = 737.6 ft
1 liter/s = 10^-3 m³/s = 3.6 m³/h = 0.03532 ft³/s = 2.1189 ft³/min (cfm) = 13.200 Imp.gal (UK)/min = 15.852 gal (US)/min = 792 Imp. gal (UK)/h
1 m/s = 3.6 km/h = 196.85 ft/min = 2.237 mph
m (meter) = 3.2808 ft = 39.37 in = 1.0936 yd = 6.214x10^-4 mile

Example - Pressure Loss in a Hot Water Heating Pipe

The pressure loss in a 2" BS 1387 hot water heating pipe with heat flow 100 kW can be estimated as indicated below

With temperature difference 20^oC the water flow is 1.2 liter/s
The flow velocity is 0.54 m/s
The pressure loss is 60 Pa/m

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Related Topics

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