This code provides guidelines for the design and installation of drainage and sanitation systems within buildings. It covers pipe sizing using fixture units, material selection, trap requirements to block sewer gases, and ventilation principles to prevent siphonage. The standard also outlines procedures for testing the integrity of installed drainage systems.
Covers the design, installation, and safety requirements for hot water supply systems in buildings.
Quick Reference Values
Minimum water seal in traps50 mm
Minimum soil pipe diameter for WC100 mm
Minimum waste pipe diameter for wash basin32 mm
Minimum gradient for 100mm drain1 in 100
Minimum ventilating pipe diameter50 mm
Fixture unit value for a Water Closet (15L)6 FU
Key Formulas
H = M * S * (T2 - T1) — Heat required to raise water temperature
Q = A * v — Flow rate in a pipe (Principle)
Practical Notes
While this standard is still in circulation, its provisions are largely incorporated and updated within the National Building Code (NBC) 2016, Part 9. It is critical to refer to the latest NBC for current projects.
Ensuring correct gradients during installation is crucial for the long-term performance of the drainage system and to prevent blockages. A 1 in 100 slope is a common benchmark for 100mm pipes.
Proper installation of anti-siphonage pipes is essential in multi-story buildings to protect the water seals of traps on lower floors.