How to choose the right inner diameter for a hydraulic hose

Easily calculate the correct inner diameter for your hydraulic hose based on flow rate and flow velocity. Includes formula, DN size table and recommended values for pressure and suction lines.

Binnendiameter Berekening — Hydraulische Slangen

Determination of the internal diameter of a hydraulic hose

D = 4,61 × √(Q/V) | V = 21,2 × Q/D²

Q = flow rate (l/min)

V = flow (m/sec)

D = internal diameter(mm)

flow rate Q

l/min

flow V

m/sec

Application

Internal diameter 19,5 mm

Standard DN-sizes

Actual flow rate per DN size