What this calculator does

List the fixtures, or enter the flow directly. It turns the total water supply fixture units (WSFU) into a demand flow, then picks the smallest pipe in PPR, copper or steel that keeps the velocity within your limit.

How it is calculated

Demand flow total WSFU → flow (Uniform Plumbing Code of Abu Dhabi, Ch. 6 Table 6-7) below 3 WSFU the 3 WSFU demand (11 L/min) is used Diameter D = √(4 Q ÷ π V) Pipe smallest size whose actual internal diameter ≥ D PPR PN20 SDR 6, copper EN 1057 R250, steel Schedule 40 Velocity default 1.75 m/s cold, 1.2 m/s hot

Questions

Can I use it outside Abu Dhabi?

The demand curve is the fixture-unit method of the Uniform Plumbing Code of Abu Dhabi. Other codes use similar curves but with different values. Check the code that applies to your project.

How do I size the hot water heater?

Use the Water Heater Sizing calculator.

Related

Water Heater Sizing · Domestic Water Tank · Fire Water Tank

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Results are for preliminary design. Verify final selections against project specifications, applicable codes and manufacturer data.