Case Study 2

Flowline Removal

Job: Separation of Spool Pieces 45° Shoulder Face
Job Location: North Sea
Time Taken to Complete Removal: 11 Hours

Project Description

The Spool Piece had to be released from between the 45 degree angle shoulder of the XMT and the flow line.

Significant amounts of blinding force generated by rust in the bolt hole annuli and between the flange faces extending all the way to the ring gasket.

Cantilevering effect caused by the angle of the spool piece and other flanges also had to be overcome.

The Solution

■  The ThinJack System was used to raise the flange block evenly without jamming it at an angle on the studs.

■  A combination of ThinJacks and associated shims, manufactured to API 6A 7 1/16” 5M flange size specification were tightly packed into the gap. This allowed the ThinJack technicians to precisely control the location that the generated force was applied to.

The Result

■  Initial gap of 11mm increased to 51mm using 16 ThinJacks.
Maximum pushing force of 168 tonnes.