DEVICE FOR INTERNAL INSULATION OF PIPELINE WELDED JOINT Russian patent published in 2019 - IPC F16L58/02 F16L13/02 

FIELD: construction; transportation.

SUBSTANCE: invention relates to construction of pipelines and can be used for internal insulation of pipe joint with inner protective coating. Device for inner insulation of welded joint 10 of pipeline 9 comprises a power drive including cylindrical housing 1 and a coaxially arranged on it cylindrical elastic working element 2 made with the possibility of radial expansion at creation in its cavity of excess pressure. Cylindrical sealing shell 5 made from elastic anti-adhesion material is coaxially installed on the power drive on outer surface of working element 2. Device is equipped with bushings 3, 4 installed on ends of power drive and fixed on housing 1. Each bushing 3, 4 adjoins by its end to end face of shell 5 and its inner cylindrical surface – to outer surface of working element 2. In the device inoperative state, shell 5 is in a state which is compressed in the axial direction.

EFFECT: invention allows increasing working pressure in power drive up to 10 bar; improving operating reliability of power drive; to ensure guaranteed tightness at formation of annular gap cavity in zone of welded connection 10; simplifying the design and reducing the manufacturing cost of elastic actuator 2 of the power drive; reduced circuit feeding compound into cavity of annular gap in zone of weld connection 10.

8 cl, 15 dwg