Pump Intake Submergence Calculator
Minimum liquid depth over a suction bell to prevent air-entraining vortices.
A surface vortex feeding air to the impeller drops head and chews bearings. If you can't get the depth, add a vortex-breaker plate over the bell.
Formula
Pump Intake Submergence Calculator is a free minimum submergence for pump engineers, plumbers and plant designers — 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 Intake Submergence Calculator
Minimum liquid depth over a suction bell to prevent air-entraining vortices. The calculation implements S = D·(1 + 2.3·Fr), Fr = V/√(gD) (Hydraulic Institute) (ANSI/HI 9.8 — pump intake design). A surface vortex feeding air to the impeller drops head and chews bearings. If you can't get the depth, add a vortex-breaker plate over the bell.
How to use Pump Intake Submergence Calculator
- 1Enter Suction bell / pipe diameter in mm.
- 2Enter Flow in L/s.
- 3Read Minimum submergence, Froude number instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Pump Intake Submergence Calculator?
- ✓Implements the standard formula — S = D·(1 + 2.3·Fr), Fr = V/√(gD) (Hydraulic Institute)
- ✓Reference cited on-page: ANSI/HI 9.8 — pump intake design
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Pump Intake Submergence Calculator use?+
It computes S = D·(1 + 2.3·Fr), Fr = V/√(gD) (Hydraulic Institute), per ANSI/HI 9.8 — pump intake design. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
A surface vortex feeding air to the impeller drops head and chews bearings. If you can't get the depth, add a vortex-breaker plate over the bell.
Can I use this for pump selection?+
Use it to establish the duty (flow, head, NPSH, power) and then pick a pump whose curve passes through that point near best efficiency. The tool gives you the engineering numbers a supplier will ask for.
Is the Pump Intake Submergence Calculator 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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