Pipe Volume Calculator
Water content of a pipeline — for flushing, dosing, draining and freeze-protection planning.
100 mm pipe holds 7.85 L/m. Flushing rules (e.g. 3 pipe volumes at ≥0.9 m/s) and chlorine dosing both start from this number — as does hydrotest water disposal.
Formula
Pipe Volume Calculator is a free pipe volume 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 Pipe Volume Calculator
Water content of a pipeline — for flushing, dosing, draining and freeze-protection planning. The calculation implements V = (π·D²/4)·L (AWWA C651 — disinfecting water mains). 100 mm pipe holds 7.85 L/m. Flushing rules (e.g. 3 pipe volumes at ≥0.9 m/s) and chlorine dosing both start from this number — as does hydrotest water disposal.
How to use Pipe Volume Calculator
- 1Enter Pipe inner diameter in mm.
- 2Enter Pipe length in m.
- 3Read Volume, Per metre, Water weight instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Pipe Volume Calculator?
- ✓Implements the standard formula — V = (π·D²/4)·L
- ✓Reference cited on-page: AWWA C651 — disinfecting water mains
- ✓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 Pipe Volume Calculator use?+
It computes V = (π·D²/4)·L, per AWWA C651 — disinfecting water mains. 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?+
100 mm pipe holds 7.85 L/m. Flushing rules (e.g. 3 pipe volumes at ≥0.9 m/s) and chlorine dosing both start from this number — as does hydrotest water disposal.
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 Pipe Volume 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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