friction loss calculator
The friction loss calculator allows you to determine the loss for a 100-metre straight pipe. Using the table below, you can calculate the loss for various fittings. You’ll find the fictitious length for different fittings along with their respective diametres.
Example
Flow: 20 m³/h through a PVC 75 pipe (pipe size 65 mm)
Velocity: 1.65 m/s
Friction loss: 4.2 mwc per 100 metres of pipe
Total pipe length: 80 metres. Additionally, there are 3 elbows, 1 T (straight through), and a non-return valve spring present.
Fictitious length: 80 + (3 x 2.6) + 1.7 + 33.2 = 122.7 metres
The friction loss is then 4.2 / 100 x 122.7 = 5.15 mwc.