Similar International Standards
ISO 2531:2023International Organization for Standardization (ISO), International
HighCurrent
Ductile iron pipes, fittings and accessories — Requirements and test methods for water applications
Specifies requirements for ductile iron fittings for water applications, aligning with the core scope of IS 15325.
EN 545:2010European Committee for Standardization (CEN), European Union
HighCurrent
Ductile iron pipes, fittings, accessories and their joints for water pipelines - Requirements and test methods
Covers ductile iron fittings for water pipelines, largely harmonized with ISO 2531.
AWWA C110/A21.10-23American Water Works Association (AWWA), USA
HighCurrent
Ductile-Iron and Gray-Iron Fittings
Defines requirements for ductile iron fittings from 3 to 64 inches for water and other liquids.
EN 598:2007+A1:2009European Committee for Standardization (CEN), European Union
MediumCurrent
Ductile iron pipes, fittings, accessories and their joints for sewerage applications - Requirements and test methods
Specifically covers the sewage application part of IS 15325, with different coating requirements.
Key Differences
≠IS 15325 covers fittings for both water and sewage applications in a single standard, whereas European standards are split: EN 545 for potable water and EN 598 for sewerage, which specifies different internal linings (e.g., high alumina cement) and external coatings (e.g., red-brown epoxy).
≠IS 15325 uses a thickness designation system based on 'K' classes (e.g., K12, K14), which is a calculation based on nominal diameter. In contrast, EN 545/ISO 2531 use 'C' classes (e.g., C40, C30, C25) and AWWA C110 uses Pressure Classes (e.g., PC 350), which are directly related to pressure handling capabilities.
≠The standard external coating requirement in IS 15325 is a metallic zinc coating of at least 130 g/m². EN 545 requires a higher minimum of 200 g/m² for pure zinc or 400 g/m² for a zinc-aluminium alloy. AWWA C110's standard coating is a 1-mil thick asphaltic coating, with zinc coatings being an optional enhancement.
≠Material strength requirements differ slightly. IS 15325 requires a minimum tensile strength of 420 MPa and 10% elongation. AWWA C110 typically references ASTM A536 Grade 65-45-12, which requires a higher minimum tensile strength of 448 MPa (65 ksi) and elongation of 12%.
Key Similarities
≈All standards mandate the use of ductile iron (spheroidal graphite cast iron) as the primary material, recognizing its high strength, ductility, and impact resistance compared to grey cast iron.
≈Hydrostatic pressure testing of every fitting is a mandatory requirement across IS 15325, EN 545, and AWWA C110 to ensure the casting is sound and free from leaks before it leaves the factory.
≈The fundamental types of joints, such as the push-on flexible joint (e.g., Tyton type) and the mechanical flexible joint (flanged), are specified and dimensionally controlled in all the standards to ensure interoperability with pipes.
≈All standards require fittings to be supplied with an internal lining for corrosion protection and to maintain water quality. Cement mortar lining is the most common and standard option specified in IS 15325, EN 545, and AWWA C110.