Water Supply Pipe Sizing Calculator
The Water Supply Pipe Sizing Calculator picks the supply pipe diameter from the water fixture units (WFU) and available pressure. Example: for a flush-valve supply serving 10 WCs and 8 lavatories over 40 m, Recommended diameter = 32 mm, Peak flow = 76.1 L/min, Velocity = 1.58 m/s (per Philippine Plumbing Code Table A-2/A-3).
How it works
Computed from your inputs per Philippine Plumbing Code Table A-2/A-3.
Worked example (Plumbing & Pumps)
Inputs: a flush-valve supply serving 10 WCs and 8 lavatories over 40 m.
| Result | Value |
|---|---|
| Recommended diameter | 32 mm |
| Peak flow | 76.1 L/min |
| Velocity | 1.58 m/s |
Computed live by WorkHive's calculation engine; standard: Philippine Plumbing Code Table A-2/A-3.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a flush-valve supply serving 10 WCs and 8 lavatories over 40 m.
- The calculator returns Recommended diameter, Peak flow, Velocity, computed per Philippine Plumbing Code Table A-2/A-3.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a water supply pipe sizing calculator WFU?
The Water Supply Pipe Sizing Calculator is a free online tool that computes picks the supply pipe diameter from the water fixture units (WFU) and available pressure. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following Philippine Plumbing Code Table A-2/A-3. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Water Supply Pipe Sizing Calculator in WorkHive: free, no sign-up needed for the calculators.