A telescopic joint (also known as a dismantling joint) is a pipeline connection element that permits a controlled amount of axial movement along the pipe axis. Its primary functions are to compensate for axial displacement caused by installation tolerances, thermal expansion/contraction, or ground settlement, and to facilitate the installation, removal, and maintenance of in-line equipment such as valves, pumps, and filters — significantly reducing maintenance downtime.
Key Features:
Axial displacement compensation – Provides a defined range of axial travel to accommodate installation misalignment and thermal movement
Easy equipment removal – Inner sleeve slides axially, allowing rapid removal of valves, pumps, or other in-line equipment without pipe cutting, substantially lowering maintenance costs
Reliable sealing – High-quality O-ring or packing seals, resistant to pressure and ageing, with stable sealing performance
Multiple configurations – Available in single-flange and double-flange connection types; single or double extension designs
Material flexibility – Carbon steel, stainless steel, ductile iron, and other materials to suit different media and corrosion environments
Compact footprint – Space-efficient design, convenient for installation in congested pipe corridors
Main Technical Parameters:
ParameterRangeNominal DiameterDN50 – DN2,000Design PressurePN6 – PN40 (Class rating also available)Axial TravelTypically 150 mm – 500 mm (customisable)Design Temperature-20°C to +200°C (depending on seal material)Working MediaWater, natural gas, crude oil, steam, chemical media, etc.
Typical Applications:
Water treatment pipelines, district heating networks, oil and gas station process pipelines, pump stations and compressor stations, and any pipeline system requiring convenient in-line equipment access.
