DEVICE FOR PERFORMANCE OF MAINTENANCE AND REPAIR WORK ON PIPELINE UNDER WATER Russian patent published in 2010 - IPC F16L55/18 E02D23/00 

FIELD: construction industry.

SUBSTANCE: invention refers to devices for maintenance and repair work on underwater pipelines. Device contains: hollow casing; inside casing there are turning bottom in shape of cylinder courses with longitudinal cutouts and supporting build-ups on ends enveloping pipeline; facility for bottom turning with respect to casing around pipeline; centering skids with cables for descent under water and installation of device on pipeline and for removal of ellipse form of pipeline in zone of its contact with device; facility for fixation of pipeline ends upon cutout of defective area; facility for stripping of turning bottom with respect to casing upon removal of device; bulkhead in form of dismountable service well and service platform. Packing of clearance between casing and turning bottom is performed using sealant which fills cavities formed by grooves made in boards welded to casing and turning bottom throughout perimetre. Mounting fits between device and pipeline is sealed using split seals of special section which form cavities filled with sealant. Sealant is delivered to cavities under pressure. Contact of turning bottom with casing is performed on the principle of slide bearings.

EFFECT: speedup and cheapening of maintenance and repair work on underwater pipelines, enhancement of reliability and safety.

15 cl, 8 dwg