METHOD OF CONNECTION OF PIPES WITH PROTECTIVE COATING Russian patent published in 2007 - IPC F16L13/14 

FIELD: construction of pipeline transport.

SUBSTANCE: invention relates to construction of pipeline transport using pipes with inner protective coating and it can be used at building and repair of pipelines transporting chemically aggressive liquids and gases. According to proposed method, pipes to be connected are assembled on sealing cylindrical bushing and clamping cylindrical sleeve is fitted on pipe butt joint from outer side with subsequent reduction of sleeve. Outer surface of sealing cylindrical bushing is subjected to machining form "projections". Ring with projection is installed in center of bore whose outer diameter is greater than inner diameter of pipes to be connected and smaller than their outer diameter by value not less than value of reduction. Sealing material is placed on outer surface of sealing cylindrical bushing. Rubber sealing rings are fitted o in grooves of surface of projections of bushing. Grooves are made on inner surface of clamping cylindrical sleeve to form projection between them in central part of sleeve. Projections and cavities of bushing and sleeve form lock in joined end of pipes.

EFFECT: improved reliability of permanent joint.

1 dwg