This code provides guidelines for the design, installation, and maintenance of plumbing systems in buildings. It covers water supply distribution, drainage systems (soil, waste, and vent pipes), and the testing of these systems to ensure functionality, hygiene, and safety.
Provides guidelines for general plumbing installations including water supply, drainage, and sanitation in buildings.
Quick Reference Values
Minimum trap seal depth50 mm
Minimum diameter for a soil pipe100 mm
Minimum slope for horizontal drainage pipes (4-inch and larger)1:100 or 1%
Minimum slope for horizontal drainage pipes (3-inch and smaller)1:50 or 2%
Water supply system test pressure1.5 times the working pressure
Minimum air gap for water supply outlets20 mm
Practical Notes
The concept of 'Fixture Units' (both for water supply and drainage) is central to sizing pipes; designers must carefully sum the units for all connected fixtures.
Proper ventilation of the drainage system is critical to prevent trap siphonage and back pressure, which can allow foul sewer gases into the building.
Always cross-reference with the latest National Building Code of India (Part 9 - Plumbing Services), which provides more comprehensive and often updated requirements.