Heating Systems - Steel Pipe Pressure Loss Diagram

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

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

• 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
• 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.
• Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more

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
• 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 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
• Steel Pipes Dimensions - ANSI Schedule 40 - Internal and external diameters, areas, weights, volumes and number of threads for schedule 40 steel pipes
• 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