Fire Protection Main Pipe Size Calculator
Diameter needed for a fire protection main at the duty's recommended 4.5 m/s design velocity.
Fire mains accept high transient velocity โ capacity during the fire trumps friction.
Formula
Fire Protection Main Pipe Size Calculator is a free fire protection main pipe size for pump engineers, plumbers and plant designers โ 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 Fire Protection Main Pipe Size Calculator
Diameter needed for a fire protection main at the duty's recommended 4.5 m/s design velocity. The calculation implements D = โ(4Q/ฯV) (ASHRAE / Hydraulic Institute velocity guidance). Fire mains accept high transient velocity โ capacity during the fire trumps friction.
How to use Fire Protection Main Pipe Size Calculator
- 1Enter Design flow in L/s.
- 2Enter Design velocity in m/s.
- 3Read Required inner ร instantly โ no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Fire Protection Main Pipe Size Calculator?
- โImplements the standard formula โ D = โ(4Q/ฯV)
- โReference cited on-page: ASHRAE / Hydraulic Institute velocity guidance
- โOne-click SI โ Imperial toggle โ values convert in place, physics stays in SI
- โBuilt-in engineering verdict flags out-of-range results instantly
- โRuns entirely in your browser โ nothing uploaded, free forever
Frequently asked questions
What formula does the Fire Protection Main Pipe Size Calculator use?+
It computes D = โ(4Q/ฯV), per ASHRAE / Hydraulic Institute velocity guidance. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Fire mains accept high transient velocity โ capacity during the fire trumps friction.
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 Fire Protection Main Pipe Size Calculator free to use?+
Yes โ 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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