Tool

Pipe size converter

Convert between DN, nominal bore, BSP thread sizes and common UK pipe materials.

Recommended protection device

Enter values and calculate to see a recommendation with the supporting regulation citation.

How to use this tool

STEP

Enter DN, nominal bore or BSP thread.

STEP

Copper, steel, MDPE and PEX use different OD/ID tables.

STEP

Use the converted size on the specification or take-off.

Regulation guide

ED devices for Fluid Category 3 and the cases where they are no longer sufficient.

Sizing, materials and isolation strategy for protected wholesome supplies.

Reduced pressure zone valves — installation, AIM, annual testing and Fluid Category 4 protection.