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Hot Water Systems - Equivalent Length vs. Fittings Resistance

Equivalent length of fittings like bends, returns, tees and valves in hot water heating systems - equivalent length in feet and meter.

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The minor loss in a system component can be converted to the "equivalent length" of a pipe or tube that would give the same major head loss.

Equivalent lengths of fittings like

elbows - regular 90^o, long radius 90^o, regular 45^o
tees - line flow and branch flow
return bends - regular and long radius
valves - globe, gate, angle and swing check
strainers

in hot water piping systems are indicated in the tables below.

Screw Fittings - equivalent length in feet

Equivalent length (in feet) of straight pipe for fittings like bends, returns, tees and valves. (Pipe size in inches)

Piping - Equivalent length of screwed fittings - feet

Screw Fittings - equivalent length in metre

Equivalent length (in metre) of straight pipe for fittings like bends, returns, tees and valves.

Piping - equivalent length of screwed fittings - meter

Flanged Fittings - equivalent length in feet

Equivalent length (in feet) of straight pipe for fittings like bends, returns, tees and valves.

Piping - equivalent length of flanged fittings - feet

Flanged Fittings - equivalent length in metre

Equivalent length (in metre) of straight pipe for fittings like bends, returns, tees and valves.

Piping - equivalent length of flanged fittings - meter

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Related Topics

Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more.
Fluid Flow and Pressure Loss - Pipe lines - fluid flow and pressure loss - water, sewer, steel pipes, pvc pipes, copper tubes and more.

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Engineering ToolBox, (2003). Hot Water Systems - Equivalent Length vs. Fittings Resistance. [online] Available at: https://www.engineeringtoolbox.com/resistance-equivalent-length-d_192.html [Accessed Day Mo. Year].

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