A ‌dismantling joint‌ (also called a ‌flanged dismantling joint‌ or ‌pipe repair coupling‌) is a specialized pipe fitting designed to simplify the installation, maintenance, and repair of pipelines, particularly around valves, pumps, and other critical components.

‌Key Features & Functions:‌

1. ‌Easy Disassembly‌

   • Allows quick removal of valves, pumps, or pipe sections without cutting or welding.
   • Reduces downtime during maintenance.

2. ‌Compensates for Misalignment‌

   • Adjusts minor pipe misalignment during installation.
   • Does ‌not‌ absorb axial movement (unlike expansion joints).

3. ‌Transmits Thrust Forces‌

   • Handles pressure thrust from pumps/valves, preventing stress on pipes.

4. ‌Leak-Proof Seal‌

   • Typically includes ‌EPDM/NBR rubber gaskets‌ for tight sealing.

‌Common Materials & Standards:‌

• ‌Body:‌ Ductile iron (GGG50), carbon steel (Q235), or stainless steel (SS304/316).
• ‌Gasket:‌ EPDM, NBR, or Viton (for chemical resistance).
• ‌Standards:‌ EN 1092, ANSI B16.5, BS 4504, or GB/T 12465.

‌Applications:‌

1. ‌Water & wastewater systems‌ (pump connections, valve flanges)
2. ‌Marine & shipbuilding‌ (seawater pipelines)
3. ‌HVAC & industrial piping‌ (compensates for thermal expansion)