METHOD OF ANTIRUST PROTECTION OF METAL PIPE-TO-INNER POLYMER COATING WELDED JOINT AREA Russian patent published in 2009 - IPC F16L58/02 F16L13/02 

FIELD: machine building, pipelines.

SUBSTANCE: invention relates to pipeline transport and can be used in construction and repair of pipelines with inner polymer antirust coating. A metal sleeve is press-fitted in the end of each pipe to be jointed together between the pipe and inner coating, the sleeve length exceeding the welding thermal effect area. Note that the sleeve features two inner tapered surfaces, widening towards the sleeve ends, and a funnel on its outer end, and an outer diameter is equal or exceeds the pipe ID. Note also that the coating end is extended. Fastening and sealing the coating end is performed by press-fitting the jamming ring into the coating end, within the area of the sleeve inner surface widening towards outside end. Note that the said jamming ring features an outer tapered surface matching the sleeve tapered surface outer end.

EFFECT: expanded performances.

2 cl, 2 dwg