This code provides general requirements for plumbing services in buildings. It covers the design and installation of water supply systems, including pipe sizing, storage, and distribution, as well as drainage systems for soil and waste. The standard focuses on ensuring functional, safe, and hygienic plumbing installations.
Covers general requirements, definitions, and basic principles for plumbing services within buildings.
Quick Reference Values
Minimum domestic water storage (full flushing)135 to 200 litres/capita/day
Minimum water seal depth in traps50 mm
Minimum water seal depth in floor traps75 mm
Minimum slope for 100mm horizontal drainage pipe1 in 100
Hydrostatic test pressure for water pipes1.5 times working pressure or 6 kg/cm², whichever is greater
Practical Notes
Although still in use, this standard is dated. It is highly recommended to refer to the latest version of the National Building Code (NBC) of India, Part 9 - Plumbing Services, which provides more current and comprehensive guidelines.
The Fixture Unit method (both WSFU for supply and DFU for drainage) is the core principle for pipe sizing in this code. Accurate calculation is critical.
Proper venting of the drainage system as per code guidelines is crucial to protect trap seals and ensure smooth flow.