Heating Systems - Steel Pipe Pressure Loss Diagram

Steel pipes and tubes - pressure loss diagram hot water heating systems

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The diagram below can be used to estimate 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 indicated 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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Related Topics

Fluid Flow and Pressure Drop Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more
Heating Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more
Fluid Mechanics The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.

Related Documents

Carbon, Alloy and Stainless Steel Pipes - ASME/ANSI B36.10/19 Pipe sizes, inside and outside diameters, wall thickness, schedules, moment of inertia, transverse area, weight of pipe filled with water - U.S. Customary Units
Steel Tubes BS 1387 (EN 10255) Dimensions and weights of steel tubes according BSi - BS 1387:1985 (EN 10255) Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads
Stainless Steel Pipes - Dimensions and Weights ANSI/ASME 36.19 Dimensions, wall thickness and weights of stainless steel pipes according to ASME B36.19 Stainless Steel Pipe
Steel Pipes Dimensions - ANSI Schedule 40 Internal and external diameters, areas, weights, volumes and number of threads for schedule 40 steel pipes
Steel Pipe Schedule 40 - Friction loss and Velocity Diagram Friction loss and velocity diagrams - in imperial (psi/100 ft, ft/s) and SI (Pa/100m, m/s) units

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