Gravity Flow Between Tanks Calculator
Flow that elevation alone drives through a connecting pipe — no pump.
All the elevation head is consumed by entry, friction and exit losses at equilibrium. Doubling pipe diameter raises gravity flow ~5–6×.
Formula
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Gravity Flow Between Tanks Calculator is a free gravity flow rate 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 Gravity Flow Between Tanks Calculator
Flow that elevation alone drives through a connecting pipe — no pump. The calculation implements Δz = (1 + ΣK + f·L/D)·V²/2g — solved iteratively for V (Bernoulli with losses — Çengel & Cimbala). All the elevation head is consumed by entry, friction and exit losses at equilibrium. Doubling pipe diameter raises gravity flow ~5–6×.
How to use Gravity Flow Between Tanks Calculator
- 1Enter Elevation difference in m.
- 2Enter Pipe inner diameter in mm.
- 3Enter Pipe length in m.
- 4Enter Σ K fittings.
- 5Read Gravity flow, Velocity instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Gravity Flow Between Tanks Calculator?
- ✓Implements the standard formula — Δz = (1 + ΣK + f·L/D)·V²/2g — solved iteratively for V
- ✓Reference cited on-page: Bernoulli with losses — Çengel & Cimbala
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Gravity Flow Between Tanks Calculator use?+
It computes Δz = (1 + ΣK + f·L/D)·V²/2g — solved iteratively for V, per Bernoulli with losses — Çengel & Cimbala. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
All the elevation head is consumed by entry, friction and exit losses at equilibrium. Doubling pipe diameter raises gravity flow ~5–6×.
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 Gravity Flow Between Tanks 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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