Specific Gravity Power Correction for Pumps
How motor load changes when the same pump moves a heavier or lighter liquid.
A centrifugal pump develops the same HEAD regardless of SG — but pressure and power scale with it. Commissioning on water a pump destined for 1.4 SG brine? The motor must carry 1.4×.
Formula
Specific Gravity Power Correction for Pumps is a free specific gravity pump power 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 Specific Gravity Power Correction for Pumps
How motor load changes when the same pump moves a heavier or lighter liquid. The calculation implements P₂ = P₁ × SG (head in metres stays the same; pressure & power scale) (Karassik, Pump Handbook). A centrifugal pump develops the same HEAD regardless of SG — but pressure and power scale with it. Commissioning on water a pump destined for 1.4 SG brine? The motor must carry 1.4×.
How to use Specific Gravity Power Correction for Pumps
- 1Enter Power on water in kW.
- 2Enter New liquid SG (Brine 1.2 · sulfuric 1.84 · gasoline 0.74).
- 3Read Power on new liquid instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Specific Gravity Power Correction for Pumps?
- ✓Implements the standard formula — P₂ = P₁ × SG (head in metres stays the same; pressure & power scale)
- ✓Reference cited on-page: Karassik, Pump Handbook
- ✓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 Specific Gravity Power Correction for Pumps use?+
It computes P₂ = P₁ × SG (head in metres stays the same; pressure & power scale), per Karassik, Pump Handbook. 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 centrifugal pump develops the same HEAD regardless of SG — but pressure and power scale with it. Commissioning on water a pump destined for 1.4 SG brine? The motor must carry 1.4×.
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 Specific Gravity Power Correction for Pumps 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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