This code provides comprehensive engineering guidelines for designing, sizing, and installing domestic hot and cold water supply systems within buildings. It focuses on ensuring adequate water pressure, preventing thermal hazards (like scalding), minimizing energy loss through insulation, and safeguarding against waterborne contamination.
Details the requirements for designing and installing hot and cold water distribution systems within buildings.
Quick Reference Values
Maximum recommended water velocity2.0 m/s
Minimum residual pressure at highest fixture1.0 bar to 1.5 bar
Hot water storage minimum temperature60°C
Maximum delivery temperature at tap45°C to 50°C
Hydrostatic test pressure1.5 times maximum working pressure
Key Formulas
Q = A × V — Continuity equation for flow rate
h_f = f(L/D)(v²/2g) — Darcy-Weisbach head loss equation
Practical Notes
Always install a pressure and temperature relief valve (PTRV) on closed hot water heating appliances to prevent explosions.
When running pipes parallel, install cold water pipes below hot water pipes to prevent heat transfer via convection.
Use dielectric unions when connecting dissimilar metals (e.g., copper to GI) to prevent galvanic corrosion.