Pipe sizing

Size from flow or loading units - equivalent sizes across copper, steel, and plastic

Demand

Mains / cold water distribution - BS 8558 loading units

Pipe material

BS EN 1057 copper tube outside diameter

Results

Choose a water service and enter demand to size pipework

Auto-selects the smallest standard size at ≤250 Pa/m. Override the size to check pressure drop on larger or smaller pipes.