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IS 15365:2003 is the Indian Standard (BIS) for ductile iron pressure pipes for water and sewage - specification. This Indian Standard specifies the requirements for ductile iron pressure pipes, including their joints and accessories, intended for conveying water or sewage. It covers material properties, dimensions, mechanical characteristics, works tests like hydrostatic pressure testing, and requirements for internal cement mortar linings and external protective coatings.
Specifies requirements for ductile iron pipes intended for use as pressure pipes for water and sewage.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! The 'K' class (e.g., K7, K9) is crucial; K9 is robust and commonly used for underground water mains, while K7 is suitable for less onerous conditions.
! Always ensure rubber gaskets used for jointing conform to IS 5382 and are compatible with the pipe's joint type (e.g., push-on Tyton joint).
! Upon delivery, visually inspect pipes for damage to the external zinc/bitumen coating and the internal cement mortar lining, as these are critical for long-term corrosion protection.
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
ductile ironpipewatersewage
International Equivalents
Similar International Standards
ISO 2531:2009International Organization for Standardization (ISO), Geneva
HighWithdrawn
Ductile iron pipes, fittings, accessories and their joints for water applications
Covers ductile iron pipes for water pipelines, forming the basis for the Indian standard.
EN 545:2010European Committee for Standardization (CEN), Europe
HighCurrent
Ductile iron pipes, fittings, accessories and their joints for water pipelines - Requirements and test methods
European equivalent to ISO 2531, with very similar requirements for water applications.
EN 598:2007+A1:2009European Committee for Standardization (CEN), Europe
HighCurrent
Ductile iron pipes, fittings, accessories and their joints for sewerage applications - Requirements and test methods
Specific to sewage applications, which is a sub-scope of the broader IS 15365.
AWWA C151/A21.51-17American Water Works Association (AWWA), USA
MediumCurrent
Ductile-Iron Pipe, Centrifugally Cast
Covers manufacturing of ductile iron pipes but uses a different system of pressure and thickness classes.
Key Differences
≠IS 15365 uses the 'K' class system (e.g., K7, K9) to define pipe wall thickness, which is based on a calculation involving the nominal diameter (DN). Modern ISO and EN standards have moved to a 'Pressure Class' (PC) or 'C-Class' system (e.g., C30, C40), which relates more directly to performance.
≠The standard minimum external zinc coating mass in IS 15365 is 130 g/m². In contrast, EN 545 specifies a higher minimum of 200 g/m² for pure zinc, and also allows for zinc-aluminium alloys (e.g., 400 g/m² of ZnAl 85/15) for enhanced corrosion protection.
≠IS 15365 covers both water and sewage in a single standard with a standard cement mortar lining. Dedicated sewage standard EN 598 requires specialized internal linings resistant to acid attack, such as high alumina cement (HAC) or polyurethane (PU), which are different from standard water pipe linings.
≠IS 15365 specifies standard effective pipe lengths of 5.5 m or 6.0 m. European standards like EN 545 predominantly standardize on a 6.0 m effective length.
Key Similarities
≈All standards specify ductile iron as the base material and have nearly identical requirements for minimum tensile strength (≥ 420 MPa) and elongation (≥ 10%) for centrifugally cast pipes, ensuring similar mechanical properties.
≈The primary manufacturing method for the pipe barrel across all standards is centrifugal casting, which ensures a dense, fine-grained pipe structure with uniform wall thickness.
≈The most common joint type, the flexible spigot-and-socket push-on joint using an elastomeric rubber gasket, is a standard feature in IS 15365 and its international counterparts, providing a reliable and easy-to-install seal.
≈All standards mandate a similar regimen of factory production control and quality testing, including works hydrostatic pressure tests, dimensional verification, and material property tests (tensile, elongation, hardness) on every batch.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Tensile Strength (Pipe)
≥ 420 MPa
≥ 420 MPa
EN 545:2010
Minimum Elongation at Fracture (Centrifugally Cast Pipe)
≥ 10%
≥ 10% (for DN > 300)
EN 545:2010
Brinell Hardness (Pipe Body)
≤ 230 HBW
≤ 230 HBW
EN 545:2010
Minimum Mass of External Zinc Coating
≥ 130 g/m²
≥ 200 g/m² (for pure zinc)
EN 545:2010
Standard Internal Lining (for Water)
Portland Cement Mortar
Portland or Blast Furnace Cement Mortar
EN 545:2010
Works Hydrostatic Test Pressure (Example: DN 300, Class K9)
5.0 MPa (50 bar)
5.0 MPa (50 bar) (for Class C40)
EN 545:2010
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum Tensile Strength420 MPa
Minimum Elongation at break10 %
Standard Pipe Length5.5 m or 6.0 m
Hardness (Brinell)Max 230 HB
Common Pressure ClassesK7, K9
Minimum Cement Mortar Lining Thickness (for DN 100)3.0 mm