Pump Rental Booklet - Catalog - Page 141
Friction Loss
Valve & Pipe Fittings
To allow for resistance of bends and other fittings, an ‘equivalent length’ for
each fitting should be added to the actual length of straight pipe. The length in
feet can be estimated with sufficient accuracy by multiplying the factors in the
following table by the pipe diameter in inches.
Equivalent pipe length at Fittings
pipe diameter
d = 10.50mm
pipe diameter
d = 80-400mm
Sluice Valve
15 - 10 x d
10 - 5 x d
Check Valve
200 - 150 x d
150 - 100 x d
Angle Valve
400 - 200 x d
150 - 100 x d
Globe Valve
1000 - 500 x d
500 - 400 x d
45º Bend
10 x d
10 x d
90º Bend
30 - 20 x d
15 - 10 x d
Outlet From Tank
(square edged)
40 - 30 x d
40 - 30 x d
Outlet From Tank
(bevelled)
10 - 5 x d
10 - 5 x d
T-piece
50 - 40 x d
40 x d
