Patent ID: 6260252
Filing Date: 2001-07-17
Classification: B23P,F16L,Y10T

Abstract:
Method for assembling or disassembling a pipeline present on a seabed, the pipeline having pipe flanges mutually attached by a plurality of nut and bolt connections, the nut and bolt connections being manipulated by at least one wrench, the wrench having an engagement cup for engaging either the nut or bolt of the nut and bolt connections, the engagement cup having an outer ring gear and being displaceable in the axial direction relative to a cup carrier, the cup carrier having a tubular housing with an inner bore and a drive housing enclosing at least one tooth wheel, which includes:a) Slidably mounting said engagement cup within said tubular housing of said cup carrier, said tubular housing having a spring contacting said engagement cup whereby when said engagement cup is displaced axially relative to said tubular housing to release the nut or bolt, said spring is compressed;b) Driving said engagement cup in the axial direction by allowing said tooth wheel to engage said outer ring gear of said engagement cup and rotating said tooth wheel;c) Engaging a predetermined nut and bolt connection of said plurality of nut and bolt connections with said engagement cup;d) Further driving said engagement cup by rotating said tooth wheel thereby releasing or securing said predetermined nut and bolt combination, said engagement cup moving axially relative to said tooth wheel during driving of said engagement cup.