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
