Equivalent length of pipe bends, valves, and filters

Minor pressure losses in piping systems for pipe elbows, bends, filters and valves may be included by using the equivalent length (Leq) of pipe method. Typical values for Leq are given below.

Equivalent length (Leq) of pipe bends

Bends

Leq/D

180o (return) bend, R = 5D

28

90o bend, R=5D

16

90o bend, R=1,5D

20

90o square bend

57

45o bend, R = 1,5 D

16

Tee, flow straight through

20

Tee, flow through side outlet

65

D = internal pipe diameter

Equivalent length (Leq) of valves and filters

Valve/filter

Leq/D

Gate valve, open

13

Gate valve 1/4 closed

39

Gate valve 1/2 closed

195

Gate valve 3/4 closed

900

Ball valve

18

Globe valve

300

Needle valve

1000

Check valve

150

Check valve, swing type

135

Filter, y-type and bucket

250

D = internal pipe diameter

Naam auteur: B. Zandbergen
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