METHOD OF CONNECTING PIPES WITH INTERNAL COATING Russian patent published in 2019 - IPC F16L13/00 

FIELD: transportation.

SUBSTANCE: invention relates to the field of pipeline transport and can be used in the construction and repair of pipelines for various purposes, transporting aggressive media. Method includes two-step expansion of inner diameter of pipe ends prior to application of coating, arrangement in area of connection with overlapping of end sections of coating of inner protective bushing, made in anticorrosive version and having on outer surface at ends of sealing elements, made with possibility of their placement in zones of change of inner diameter of two-stage expansion after connection of pipes, and connection of pipes by butt welding. Protective bushing is made in form of cylindrical branch pipe with grooves open at its ends and outer diameter providing formation after gap with ends of pipes for thermal insulation of protective bushing, wherein, before installation of protective sleeve, stops are fitted on pipe inner side and sealing elements are arranged on outer side.

EFFECT: invention simplifies process of connection manufacturing.

1 cl, 2 dwg