Friction Losses of Various Components Installed in Pipelines

  • The chart is calculated for fresh water at 15°C.
  • Use actual bores rather than nominal pipe size.
  • For stainless steel pipe multiply the numbers by 1.1.
  • For steel pipe multiply the numbers by 1.3 .
  • For cast iron pipe multiply the numbers by 1.7.

The losses are calculated for a fluid viscosity similar to fresh water

This chart will let you calculate the losses through various types of valves and fittings

Equivalent Length of Straight Pipe in Metres;
For Calculating Friction Loss
Pipe
Size
(mm)
Normal
Elbow
Long
Radius
Elbow
Short
Radius
Elbow

Return
Bend
‘U’

Tee
‘T’
Gate
Valve
Open
Globe
Valve
Open
Swing
Check

Foot
Valve
and
Strainer

20 0.5 0.3 0.6 1.5 1.5 0.3 6.7 1.5 1.5
25 0.5 0.3 0.8 2 1.8 0.3 8.2 2 2.3
32 0.8 0.3 0.9 2.6 2.4 0.6 11.3 2.6 2.7
40 0.9 0.4 1.1 3.1 2.7 0.6 13.4 3.1 3.4
50 1.1 0.5 1.4 4 3.4 0.8 17.4 4 4.6
65 1.4 0.6 1.7 4.6 4.3 0.9 20.1 5.2 5.5
80 1.5 0.8 2.1 5.5 5.2 1.1 26 6.1 6.7
100 2.1 1.1 2.7 7.3 6.7 1.5 34 8.2 8.8
125 2.7 1.2 3.7 9.5 8.2 1.8 43 10 11
150 3.4 1.5 4.3 11 10 2.1 49 12.2 14
200 4.3 2.1 5.5 15 13.4 3.1 67 16.5 18
250 5.5 2.4 7.3 19 16.5 3.7 85.4 20 22
300 6.7 3.1 8.5 23 20 4.3 98 24.4 27.4

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