Pump Suction Line Velocity Checker
Check pump suction line velocity against the recommended 0.6–1.2 m/s design window for the duty.
Slow suctions protect NPSH; 1.2 m/s (4 ft/s) is the usual ceiling, slower for hot or volatile liquids.
Formula
Pump Suction Line Velocity Checker is a free pump suction line velocity for process, mechanical and water engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Pump Suction Line Velocity Checker
Check pump suction line velocity against the recommended 0.6–1.2 m/s design window for the duty. The calculation implements V = Q / A = 4·Q / (π·D²) (Hydraulic Institute ANSI/HI 9.6.6). Slow suctions protect NPSH; 1.2 m/s (4 ft/s) is the usual ceiling, slower for hot or volatile liquids.
How to use Pump Suction Line Velocity Checker
- 1Enter Flow rate in L/s.
- 2Enter Pipe inner diameter in mm.
- 3Read Velocity instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Pump Suction Line Velocity Checker?
- ✓Implements the standard formula — V = Q / A = 4·Q / (π·D²)
- ✓Reference cited on-page: Hydraulic Institute ANSI/HI 9.6.6
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Pump Suction Line Velocity Checker use?+
It computes V = Q / A = 4·Q / (π·D²), per Hydraulic Institute ANSI/HI 9.6.6. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Slow suctions protect NPSH; 1.2 m/s (4 ft/s) is the usual ceiling, slower for hot or volatile liquids.
Does this work for any fluid?+
Yes — density and viscosity are inputs (with common fluids suggested in the field hints), so the same physics applies to water, oils, gases and process fluids. Compute always runs in SI internally, so unit mix-ups can't corrupt the result.
Is the Pump Suction Line Velocity Checker free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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