Heating Systems - Pressure Loss Diagram Steel Pipes

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Pressure loss diagram hot water heating systems - steel pipes and tubes

The diagram below can be used to estimate the pressure loss in hot water piping heating systems.

hot water heating system pressure loss piping diagram

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 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 viewed below:

hot water heating system pressure loss diagram example

With a temperature difference of 20^oC the 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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