Manual for the Design of Pipe Systems and Pumps - GEA ...

8.2 Pressure drops of fittings in metre equivalent pipe length
Fitting Nominal Diameter in mm
25 32 40 50 65 80 100 125 150
ζ = 0.05 0.05 0.07 0.09 0.12 0.17 0.20 0.28 0.40 0.48
Reducer
Tee
ζ = 0.15 0.14 0.20 0.27 0.35 0.50 0.60 0.85 1.20 1.40
Bend 45°
ζ = 0.25 0.25 0.35 0.45 0.60 0.80 1.00 1.35 1.90 2.4
Bend 90°
Expansion
Butterfly valve
Inlet
(Tank outlet)
ζ = 0.90 0.90 1.20 1.60 2.00 3.00 3.70 5.20 7.00 8.80
Tee
ζ = 1.30 1.20 1.80 2.30 3.00 4.30 5.40 7.40 10.00 12.50
Tee
ζ = 1.5 1.40 2.10 2.70 3.50 5.00 6.30 8.50 11.50 14.50
Reflux valve
Applies to: Pipe roughness k = 0.05 mm
Flow speed v = 1-3 m/s (error >10% deviation in speed)
(Accuracy ± 5%)
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GEA Tuchenhagen