TF Type Self-anchored Joint

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TF Type Self-anchored Joint

Self-restrained Type is a push-in self anchored joint. The principle of joint anchoring consists in transmitting the axial forces from one pipeline to the following one, thus ensuring that the joint does not come apart.

The application of self-restrained joints is of particular interest where congested conditions preclude concrete anchor block constructions or in poorly cohesive soils.

Self-restrained joints combine the advantages of flexible joint pipes and welded joint pipes.

Self-anchored joints allow the axial thrusts arising at particular points (bends,tapers, tees, blank flanges) to be distributed over one or more pipes, thus avoiding installation of concrete anchor blocks.

The seal is provided by a standard gasket.The axial force transmission is through a mechanical arrangement, independent of that providing the seal, comprising:

(1)  Weld been on the pipe spigot

(2)  A one-piece or segmented anchoring locking ring with a curved external profile, which abuts against the weld bean

(3)  A special gland, which blocks the locking ring.

(4)  Iron bolts. 

PEA: maximum hydrostatic pressure that a newly installed component can withstand for a relatively short duration, when either fixed above ground level or laid and backfilled underground, in order to measure the integrity and tightness of the pipeline 

NOTE: This test pressure is different from the system test pressure, which is related to the design pressure of the pipeline

PFA: maximum internal pressure, excluding surge, which a component can safely withstand in permanent service

PMA: maximum internal pressure, including surge, which a component can safely withstand in service

Self-anchored joints allow the axial thrusts arising at particular points (bends,tapers, tees, blank flanges) to be distributed over one or more pipes, thus avoiding installation of concrete anchor blocks.