Ductile Iron Pipe
A stalwart of the water industry.
Ductile Iron Pipe is a high-performance solution for water and wastewater networks, delivering proven strength, reliability, and efficient installation. Made from premium ductile iron it offers excellent mechanical strength, internal pressure resistance, and long-term corrosion protection, making it ideal for municipal, industrial, and utility infrastructure.
Our pipes are manufactured in accordance with EN 545 for potable water applications and EN 598 for wastewater systems. Each pipe includes a factory-applied cement mortar lining with an epoxy seal coating or high alumina cement, enhancing internal corrosion protection and flow efficiency. External coatings such as zinc with finishing layers meet EN coating requirements for resistance against aggressive soils.
Specifications
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Our potable water pipe is DWI approved, for use across the UK and Northern Ireland.
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EN 545 is the European standard specifying requirements for ductile iron pipes, fittings, accessories, and their joints for the conveyance of potable water. It applies to products with internal diameters from DN 40 to DN 2000 and covers pressure ratings typically up to PN 40. The standard outlines design, dimensions, mechanical properties, coatings (internal and external), performance testing, and marking requirements. Internal linings such as cement mortar and external coatings like zinc with finishing layers are specified to ensure corrosion resistance and longevity. EN 545 ensures safety, durability, and quality for ductile iron pipeline systems in water supply networks.
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EN 598 is the European standard for ductile iron pipes, fittings, accessories, and their joints used in gravity and pressure sewerage systems or for treated wastewater. It applies to sizes from DN 40 to DN 2000 and includes requirements for mechanical strength, chemical resistance, and leak-tightness under operating and test conditions. The standard specifies internal linings (high alumina cement) for resistance to aggressive effluents, and external coatings (like zinc and bitumen) for corrosion protection. EN 598 ensures products meet performance criteria for durability, reliability, and environmental protection in non-potable water infrastructure applications.
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Our ductile iron pipes are available in sizes of 80mm through to 2200mm as standard. Our standard lengths are 5.5m but can be increased to 6m for projects.
For our restrained system we supply a complete restrained system from diameters of 80mm through to 1800mm.
Jointing Details
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Ductile iron pipes use socket-and-spigot joints with a vulcanized rubber gasket: a hard “heel” for grip and soft “bulb” for sealing. The tapered spigot presses evenly into the gasket, leaving a gap for deflection and thermal expansion, ensuring flexible, durable, and continuous pipeline assembly above or below ground.
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Flange joints are rigid joints. Flanges are fixed on either ends of barrel pipe piece. This type of joint can be manufactured using different methods.
1. Integrally Cast flanged pipes:
In Integrally cast flanged pipes the Ductile Iron pipes are cast in the foundry with integrally cast flanges on them. These flange pipes are normally of small lengths up to 2 metres.
2. Welded-on flanged pipes:
In Welded-on flanged pipes the flanges are welded on to the ends of the pipe barrels.
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Double chamber restrained pipes are designed to connect individual pipes via a locking system. This type of Joint provides restrains against axial movement of pipe with the use of lock segments, which are restrained by the socket sloping face and weld bead. Locking segments are placed along the periphery of the pipe spigot and tightened by wrapping belt.
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Anchor gaskets, with metal inserts are used in this type of joint. The metal teeth allow the spigot to be pushed into the socket. However, once the spigot is fully inserted, the teeth hold the spigot and restrict it from coming out.
Internal Coatings
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Our cement mortar lining provides excellent corrosion protection for ductile iron pipes, ensuring the long-term integrity and reliability of the pipeline. We offer various cement mortar lining options to suit different project requirements:
Ordinary Portland Cement (OPC)
Sulphate Resisting Cement (SRC)
Blast Furnace Slag Cement (BFSC)
High Alumina Cement (HAC)
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Our cement mortar lining combined with a seal coat offers enhanced protection against corrosion and abrasion, extending the service life of ductile iron pipes in even the most demanding environments. The seal coat options include:
Epoxy
Bituminous Seal Coat
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Our polymeric lining, specifically Polyurethane (PU), provides superior corrosion and abrasion resistance for ductile iron pipes, ensuring long-term durability and reliability. Polyurethane lining is suitable for various applications and environments.
BS EN 15655
External Coating
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Our zinc coating, combined with a finishing layer of either bitumen or epoxy, provides excellent corrosion protection for ductile iron pipes in aggressive environments. The zinc coating acts as a sacrificial layer, while the bitumen or epoxy finishing layer adds additional protection and ensures long-term durability.
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Our zinc aluminum coating, combined with a finishing layer, provides superior corrosion resistance and long-term durability for ductile iron pipes. The zinc aluminium coating offers enhanced protection against corrosion, while the finishing layer ensures optimal performance in various environmental conditions.
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Our polymeric lining, specifically Polyurethane (PU) coating, provides superior corrosion protection and long-term durability for ductile iron pipes, even in the most demanding environments. The PU coating forms a seamless barrier that effectively protects the pipe surface from corrosion and abrasion.
BS EN 15189