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IS 5329:1983 is the Indian Standard (BIS) for sanitary pipe work above ground for buildings. This code of practice provides guidelines for the design, layout, and installation of sanitary pipework for drainage of soil and waste from buildings. It covers materials, pipe sizing based on discharge units, trapping, ventilation, and testing of above-ground systems. The standard aims to ensure efficient and hygienic removal of wastewater without nuisance from foul air.
Code of practice for sanitary pipe work above ground for buildings
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! The code covers both one-pipe and two-pipe systems. The choice depends on building type and complexity, with the one-pipe system being more common in modern residential buildings.
! Proper installation of anti-siphonage pipes is critical to prevent the loss of trap water seals, which is a common cause of foul smells entering the building.
! Close coordination with architectural and structural drawings is essential to ensure required pipe slopes can be achieved without clashes and with adequate access for maintenance.
BS EN 12056-2:2000BSI / CEN (British Standards Institution / European Committee for Standardization), UK / Europe
HighCurrent
Gravity drainage systems inside buildings - Part 2: Sanitary pipework, layout and calculation
Directly covers the design, layout, and calculation of sanitary pipework systems inside buildings.
IPC 2021International Code Council (ICC), USA
HighCurrent
International Plumbing Code
Chapters 7 (Sanitary Drainage) and 9 (Vents) cover the equivalent requirements for materials, sizing, and installation.
AS/NZS 3500.2:2021Standards Australia / Standards New Zealand, Australia / New Zealand
HighCurrent
Plumbing and drainage - Part 2: Sanitary plumbing and drainage
Provides requirements for the design and installation of sanitary plumbing systems, including above-ground pipework.
BS 5572:1994British Standards Institution (BSI), UK
HighWithdrawn
Code of practice for sanitary pipework
Was the direct British predecessor and a strong influence on the IS 5329, covering identical system types.
Key Differences
≠IS 5329:1983 specifies outdated materials like asbestos cement pipes, which are prohibited in modern international standards like the IPC and EN 12056-2 due to health risks. Modern codes focus on plastics (uPVC, HDPE, PP) and modern ductile iron.
≠Pipe sizing in IS 5329 is based on simple fixture unit look-up tables. EN 12056-2 uses a more complex hydraulic calculation method based on design flow rate (Qww), which considers simultaneous usage probability.
≠Modern standards like the IPC and AS/NZS 3500.2 have detailed provisions for Air Admittance Valves (AAVs) as an alternative to traditional atmospheric venting, a technology not covered in the 1983 Indian standard.
≠The specified air test pressure in IS 5329 is 38 mm water gauge (approx. 0.005 psi), which is significantly lower than the 5 psi (approx. 3500 mm water gauge) required by the International Plumbing Code (IPC), indicating a major difference in testing rigor.
Key Similarities
≈All standards are fundamentally based on the principle of using gravity for drainage, mandating continuous downward gradients for all horizontal soil and waste pipes.
≈The requirement to install a water seal trap at every fixture to prevent the ingress of foul air and sewer gas into the building is a universal principle across IS 5329 and all its international counterparts.
≈All codes recognize the critical need for a ventilation system to protect trap seals from being lost due to pressure fluctuations (siphonage and back-pressure) within the drainage pipework.
≈The basic drainage system configurations described in IS 5329 (Two-Pipe, One-Pipe, Single Stack) are conceptually similar to the systems defined in modern codes like BS EN 12056-2 (Systems I, II, III), although the terminology and specific rules have evolved.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Trap Seal Depth
50 mm
Not less than 2 inches (51 mm)
IPC 2021
Minimum Gradient for 100mm (4") Pipe
1 in 40 (2.5%)
1/8 inch per foot (approx. 1%)
IPC 2021
Water Test Head
3 m head of water
10-foot (3.05 m) head of water
IPC 2021
Air Test Pressure
38 mm water gauge (≈0.37 kPa)
5 psi (≈34.5 kPa)
IPC 2021
Air Test Duration
5 minutes
15 minutes
IPC 2021
Minimum Vent Pipe Size for 100mm Soil Stack
50 mm
2 inches (50.8 mm)
IPC 2021
Minimum Gradient for 100mm (4") Pipe
1 in 40 (2.5%)
1.5% (approx. 1 in 67)
AS/NZS 3500.2:2021
⚠ Verify details from original standards before use
What is the minimum slope for a 100mm horizontal drain pipe?+
A gradient of 1 in 40 is recommended, but flatter gradients up to 1 in 80 may be used in specific cases (Clause 5.3.3).
What is the minimum water seal depth for a trap?+
50 mm for most fixtures. For traps not in constant use, such as floor traps, the seal should be at least 75 mm to account for evaporation (Clause 6.3).
What is the purpose of a vent pipe?+
To prevent loss of water seals in traps due to siphonage or back-pressure, and to ventilate the system by allowing foul air to escape at a high level (Clause 9.1).
How is a new sanitary pipework system tested?+
Either with a water test (filled to a head of at least 3m for 10 mins with no leakage) or a smoke test (pressurized to 38 mm water gauge for 15 mins) (Clause 13).