Double Flange Dismantling Joint

The efficient installation, maintenance, and long-term reliability of pressurized pipelines depend on high-quality coupling solutions. For engineers and project managers specifying components for water supply, fire protection, industrial processing, and district heating systems, selecting the correct DI Double Flange Power Transmission Dismantling Joint is critical. This specialized fitting is engineered to simplify pipeline assembly by allowing for precise axial adjustment and easy removal of valves or pumps without the need for cumbersome pipe cutting. A Double Flanged Loose Sleeve Force Transfer Joint provides the necessary flexibility to accommodate thermal expansion, contraction, and ground settlement while maintaining a leak-proof seal under substantial internal pressure and external thrust forces. For applications demanding superior strength and durability, a Ductile Iron Double Flange Dismantling Joint with Tie Rods is the preferred choice, offering enhanced structural integrity through its robust construction and integral restraining tie rods.

The Double Flange Dismantling Joint is a precision-engineered assembly designed for seamless integration into flanged piping systems. Its primary function is to facilitate the controlled disassembly of pipeline sections for maintenance or replacement of key components, such as valves, meters, or pumps. The joint typically consists of two flanged end pieces connected by a telescoping sleeve or spool, which contains the primary sealing gasket. Adjustable tie rods, often included as a standard or optional feature, are crucial for restraining the joint against internal pressure thrust and external pipeline loads, ensuring the mechanical forces are safely transferred to the adjacent pipe anchors or structures. This design not only prevents unintended separation but also allows for precise axial adjustment during installation to compensate for minor misalignments or to achieve the correct gap for component removal.

Key Features & Specifications

• Material Construction: Manufactured from high-grade ductile iron (GGG40/50) or cast iron, with components like bolts, nuts, and tie rods made from corrosion-resistant carbon steel, often with a protective epoxy coating.
• Pressure Rating: Designed to withstand standard pipeline operating pressures, commonly rated for PN10/PN16 or Class 150/Class 300, depending on design and application.
• Sealing System: Utilizes a high-quality elastomeric gasket (typically EPDM or NBR) compressed within a confined gland, ensuring a bubble-tight seal and allowing for limited angular deflection.
• Adjustment & Movement: Provides controlled axial compression and extension to accommodate installation tolerances. Some designs allow for limited lateral or angular movement to absorb minor pipeline shifts.
• Corrosion Protection: External surfaces are usually coated with fusion-bonded epoxy (FBE) or a similar protective layer to resist environmental corrosion.

Standard Product Parameters Table

Typical Applications

• Connection and isolation points for pumps and valves in water and wastewater treatment plants.
• Compensation sections in long-run district heating and cooling networks.
• Critical junctions in industrial process piping for chemical, pharmaceutical, or food & beverage sectors.
• Fire protection sprinkler and standpipe system risers.
• Marine and offshore pipeline systems requiring reliable, bolted connections.