Smaller option
20 mm
- Pressure drop
- 0.59 bar
- Velocity
- 1.66 m/s
- Performance
- Not recommended
Free hydraulic check
Pressure Drop Calculator
Estimate line pressure loss, water velocity, and whether the current pipe size is a safe choice before you buy.
Built to work alongside the RAMO pipe selector so users can move from rough sizing into pressure-loss checks without switching tools.
Shows pressure drop and water velocity for the selected run.
Flags warning and critical losses before they become product mistakes.
Compares neighboring pipe sizes so upsell decisions are easy to justify.
Enter your pipe run
Use the selected pipe size, total line flow, full run length, and water temperature. The result checks both pressure loss and velocity.
Velocity check
Velocity stays below the practical limit, so noise and turbulence risk remain low.
Velocity safe
Water velocity
1.06 m/s
Hot-water limit
2 m/s
Compare nearby pipe sizes
The comparison below shows how pressure loss and velocity shift if you go down or up one common SP size.
Your choice
25 mm
Selected
- Pressure drop
- 0.2 bar
- Velocity
- 1.06 m/s
- Performance
- Strong margin
Larger option
32 mm
- Pressure drop
- 0.06 bar
- Velocity
- 0.63 m/s
- Performance
- Strong margin
Pressure-drop calculator FAQ
Built to work alongside the RAMO pipe selector so users can move from rough sizing into pressure-loss checks without switching tools.
What is pressure drop in a pipe run?
Pressure drop is the amount of water pressure lost because of friction while water moves through the pipe. Longer runs, smaller diameters, and higher flow rates all increase that loss.
Why does line length matter so much?
Each additional meter adds friction. A pipe size that works well on a short branch can become restrictive on a long run even at the same flow.
Why does the tool also check velocity?
High velocity can create noise, turbulence, and extra wear. A line can have acceptable pressure loss but still benefit from a larger diameter if velocity is too high.
What should I do if the result is critical?
The fastest fix is usually to increase the pipe size. If that is not practical, reduce the run length, split the demand, or review the line with RAMO before ordering.