PIPELINE WELD JOINT (VERSIONS) Russian patent published in 2014 - IPC F16L13/02 B23K31/02 

FIELD: process engineering.

SUBSTANCE: set of inventions relates to pipeline welds. Proposed assembly consists of metal pipes with protective coating applied on their inner surfaces and bush composed of cylindrical section and conical section arranged in symmetry. Said bush is arranged inside the pipes with thrust rings secured rigidly thereat at equal distance from the bush ends. Rubber sealing cups are arranged between thrust rings and bush conical sections. At least three thrusts are symmetrically secured at bush surface at its central section at equal distance from bush ends. heat insulating layer is applied on the bush cylindrical section while sealing material is applied on the bush conical sections. It differs from known designs in that said thrust have skewed ledges to allow an automatic alignment of pipes at fitted them on to said bush. Said thrusts feature decreased cross-section below ledges to reduce heat transfer to the bush while rubber sealing cups have conical resilient outer jacket. Maximum OD of the latter is larger than ID of welded pipes while minimum OD is smaller than pipe ID.

EFFECT: higher reliability of joint.

2 cl, 2 dwg