October 14, 2025
For buyers, importers and contractors specifying ductile iron pipe fittings, choosing the correct European standard — EN 545 or EN 598 — is crucial for project longevity, regulatory compliance and maintenance cost control. This concise technical brief highlights the practical differences and procurement implications.
EN 545 applies to ductile iron pipes, fittings and accessories used in water supply systems (potable water, raw water, irrigation). EN 598 applies to ductile iron pipes and fittings for sewage, drainage and wastewater systems. The two standards differ in corrosion focus, lining/coating options and required chemical-resistance testing.
| Feature | EN 545 (Water Supply) | EN 598 (Sewage / Drainage) |
|---|---|---|
| Primary use | Potable water, irrigation, raw water | Sewage, wastewater, storm drainage |
| Corrosion focus | Moderate — designed for typical water corrosion | High — chemical & biological resistance for aggressive media |
| Internal lining options | Cement mortar, epoxy, polyurethane (PU) | Cement mortar, epoxy, PU, silicate linings |
| External coating | Zinc + bitumen or PE sleeving | Zinc + bitumen, PE sleeving, or PU external coating |
| Testing & certification | Hydrostatic and mechanical testing to ensure pressure integrity | Hydrostatic, mechanical, plus additional chemical resistance tests |
Specify the correct standard in tender documents: Use EN 545 for potable water networks and EN 598 for sewerage or wastewater lines to avoid non-conforming deliveries.
Coating and lining selection matters: For municipal waterworks prioritize certified cement mortar or epoxy linings; for wastewater projects require silicate or PU linings and explicit chemical-resistance test reports.
Request test documentation: Ask suppliers for hydrostatic test certificates, lining/coating certificates and chemical-resistance test results where EN 598 applies.
Lifecycle cost vs. upfront cost: EN 598-grade fittings typically cost more but reduce long-term maintenance and replacement in aggressive environments.
Compatibility and jointing: Confirm joint types, gaskets and accessories meet project tolerances and local installation practices.
Choosing the correct standard ensures long-term system reliability, compliance with project requirements, and cost efficiency in maintenance. Water projects require EN 545 fittings, while sewage and drainage systems demand EN 598-grade products for maximum performance and durability.
If you are sourcing ductile iron pipe fittings for your next project, Midas can provide EN 545 and EN 598 certified solutions with reliable quality and international delivery. Contact us today to discuss your requirements.
