The DI Dismantling Joint, or Ductile Iron Dismantling Joint, is a crucial double-flanged pipeline fitting designed for connecting flanged pipes, valves, pumps, and flowmeters in water supply and sewage systems. Also referred to as a telescopic dismantling coupling, it addresses the challenges of disassembling equipment and managing pipeline length deviations during on-site construction. This fitting has become a key product for our company, alongside T-Type ductile iron pipes and manhole covers.
Constructed from high-toughness GGG500 ductile iron in compliance with EN1563 standards, our DI dismantling joint features exceptional impact resistance and pressure-bearing capacity. The inner and outer surfaces are coated with fusion-bonded epoxy, meeting drinking water safety standards and effectively resisting oxidation and saltwater corrosion. This makes it suitable for harsh environments, such as underground burial, pump rooms, and coastal areas. The adjustable telescopic structure provides axial compensation of ±25mm to ±100mm, accommodating variations in installation due to pipe cutting errors, foundation settlement, and thermal expansion.
We offer a comprehensive range of sizes from DN50 to DN3000, supporting multiple pressure grades including PN10, PN16, PN25, and PN40, which align with EN1092-2 international flange drilling standards. The sealing gaskets can be made from optional materials such as EPDM, NBR, and SBR. The EPDM gasket is ideal for drinking water pipelines, while the NBR gasket is suitable for industrial sewage and neutral fluid transmission. Standard tie rods and fasteners are made from galvanized carbon steel, with options for 304/316 stainless steel bolts available for high-corrosion projects.
The primary advantage of the DI dismantling joint is its ease of maintenance. When valves, water meters, or pumps fail and need replacement, only the tie rod bolts need to be loosened to create sufficient working space, without the need to cut or disassemble large sections of pipeline. This significantly reduces construction downtime and lowers labor and maintenance costs for overseas engineering contractors. Additionally, the integral tie rod structure can withstand the axial thrust of the pipeline, absorb vibrations from pump operation, and protect the longevity of valves and pipeline equipment.
This product is widely used in municipal water supply plants, sewage treatment stations, pumping stations, underground valve wells, power plant cooling water pipelines, and urban reconstruction projects. For large infrastructure projects abroad, our factory maintains stable production capacity, offering comprehensive support alongside ductile iron pipes, manhole covers, and pipe fittings. We provide complete mill test reports, pressure inspection certificates, and international standard certification documents to facilitate customs clearance and project acceptance.
We also offer personalized customization services, including adjustable stroke redesign, special flange standards, customized logo engraving, and specialized anti-corrosion coatings. All finished products are bundled with steel straps and wrapped in plastic films before shipment to prevent damage during long-distance sea transport. With reliable supply, rigorous quality inspections, and competitive factory-direct pricing, our DI dismantling joints have been successfully exported to Southeast Asia, the Middle East, Europe, Africa, and Latin America, earning long-term partnerships with municipal engineering firms and pipeline distributors worldwide.
If you're seeking a trusted supplier of ductile iron pipeline fittings, please send your project parameters and required sizes. We will provide detailed technical data sheets and favorable bulk quotations.
