IS 3414:1986 is the Indian Standard (BIS) for design and installation of hot and cold water installations in buildings. 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.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Pressure at Outlet | 0.05 N/mm² (5 metres head) recommended for most fixtures | 55 kPa / 8 psi (for most common fixtures like lavatories) | IPC 2021, Table 604.3 |
| Maximum Flow Velocity (General) | 1.5 m/s (recommended), not exceeding 2.0 m/s | Recommended maximum of 2.0 m/s for metal pipes | BS EN 806-2:2005 |
| Hydrostatic Test Pressure | 1.5 times working pressure, or 0.6 N/mm² (600 kPa), for 1 hour | 1.5 times working pressure, but not less than 690 kPa (100 psi), for 15 minutes | IPC 2021, Sec 312.5 |
| Minimum Air Gap (Basin Tap) | 20 mm or 2 times inlet pipe diameter, whichever is greater | 20 mm or 2 times inlet pipe diameter (for low hazard) | AS/NZS 3500.1:2021, Table 4.3 |
| Hot Water Storage Temperature (Health) | 60°C recommended to minimize scale | Store at >= 60°C to control Legionella bacteria | BS 8558:2015 |
| Minimum Water Service Pipe Size | 15 mm nominal bore | 3/4 inch (19.1 mm) | IPC 2021, Sec 604.5 |