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DN300 Dismantling Joint

DN300-DN2000
The DN300 Dismantling Joint is a robust pipe connection fitting engineered for flanged piping systems requiring convenient installation, maintenance, and removal of valves, pumps, flow meters, and other flanged equipment. This joint incorporates a telescopic action between a flanged spigot and a flange adaptor, secured by tie rods that simultaneously serve as mating flange connecting bolts, delivering both axial adjustment capability and force transfer functionality.
Designed to accommodate normal pipe installation tolerances and simplify field modifications, the dismantling joint significantly reduces downtime during maintenance operations and protects sensitive equipment from excessive end load forces.
Delivery
FOB
minimum order
1 piece
Supply Ability
10piece / Month
Country of Origin
China
Stock Time
30Day
Quantity:
US $100.00 - US $10000.00 / piece
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Key Features
Double Flanged Configuration – The joint is equipped with flanges on both ends, enabling direct connection to standard flanged pipes, valves, and equipment. The spigot flange provides a full sealing face, making it particularly suitable for applications involving wafer and butterfly valves where full-face flange sealing is essential.
Axial Adjustment Capability – The joint provides substantial longitudinal adjustment, allowing the flange-to-flange dimension to be varied within a specified range. This flexibility makes it easy to install or remove flanged components even in confined spaces or where pipe alignment is less than perfect.
Force Transfer Through Tie Rods – The robust tie rods transmit axial thrust, commonly referred to as blind flange force, from the connected pipe back through the entire pipeline system. This critical function protects vulnerable equipment such as pumps and valves from excessive end load forces that could otherwise cause premature wear or catastrophic failure.
Independent Gasket Sealing – Studs that are independent of the tie rods compress the gasket, ensuring that long-term sealing performance remains unaffected by external loading conditions or adjustments made to the tie rods.
Minimal Maintenance Requirements – The joint enables rapid disassembly of flanged equipment, dramatically reducing downtime during maintenance, repair, or replacement operations. This feature is particularly valuable in facilities where operational continuity is paramount.
Technical Specifications
The DN300 dismantling joint is manufactured to suit PN16 pressure ratings, with the flange configuration complying with AS4087, BS EN1092-1, or AWWA C219 standards depending on regional requirements. The nominal length is typically 300 millimetres, with an adjustment range extending from a minimum of 275 millimetres to a maximum of 325 millimetres, providing 50 millimetres of longitudinal flexibility to accommodate installation tolerances.
The tie rod configuration typically comprises five to seven stainless steel tie rods, sized from M20 to M24 depending on the specific standard and pressure rating. The body material is constructed from ductile iron or carbon steel with protective coating, while stainless steel options are available for more demanding corrosive environments. The sealing element is manufactured from EPDM or NBR, selected for their excellent resilience and compatibility with a wide range of media.
Flange thickness ranges from 20 to 30 millimetres depending on the applicable standard, and the joint is designed to deliver a working pressure equal to the connected flange rating, ensuring seamless integration with the existing piping system.
Technical Advantages
The dismantling joint substantially reduces installation complexity by accommodating up to 50 millimetres of longitudinal adjustment, effectively compensating for normal pipe installation tolerances and simplifying field modifications that would otherwise require costly rework.
The independent gasket sealing system ensures that sealing integrity is maintained regardless of external loading or tie rod adjustments, providing long-term leak-tight performance that minimises maintenance interventions.
The joint's stainless steel construction delivers superior corrosion resistance compared to carbon steel alternatives, making it suitable for both potable water applications and aggressive industrial environments where chemical attack is a concern.
Furthermore, the rapid disassembly capability significantly reduces maintenance downtime, allowing valves and pumps to be removed and replaced without disturbing the adjacent piping, which translates directly to improved operational efficiency and reduced lifecycle costs.
Applications
The DN300 dismantling joint is widely employed across a diverse range of industries and applications. In water and wastewater treatment plants, it facilitates the installation and maintenance of large valves and pumps. Pumping stations and booster stations utilise these joints to simplify equipment change-outs and reduce system downtime.
Industrial piping systems in chemical, petrochemical, and pharmaceutical facilities benefit from the joint's corrosion-resistant construction and maintenance-friendly design. Power generation facilities employ dismantling joints in cooling water systems and other flanged pipe networks requiring frequent access. Metering chambers and valve stations rely on these joints to enable rapid equipment removal for calibration, inspection, or replacement.