Joint integrity and engineering services company Hydratight devised a clever solution to repair a pipe within a subsea manifold located 340m under the surface of the North Sea.
Experts from Hydratight were called in to repair a damaged pipe on a subsea well head, Christmas Tree on Statoil’s Troll C oil and gas platform, 100km north-west of Bergen, Norway.
A mandrel and its 6-inch supporting pipe were pulled out of position during an operation, overloading the pipe and forcing the shutdown of an associated 10-inch line, halting production.
Hydratight used a MORGRIP connector to repair the 6-inch super duplex pipe located within the constrained space of the subsea manifold.
Hydratight application engineer Mark Fisher explains that solutions for pipeline repair are limited at that depth. A 6-inch super duplex MORGRIP end-connector had to be specially engineered to fit within the significant physical constraints of the damaged manifold. Since the cracked pipe was partially inside the manifold, Hydratight engineers had to ensure that the MORGRIP’S overall dimensions were an absolute minimum to get it to fit.
The MORGRIP connector successfully sealed the line in accordance with Statoil’s requirements, retaining the pipe integrity with no de-rating of the pipeline or deviation from original design.
The pipe, which carries a mixture of water, oil and gas was pressure-tested to 267bar after the procedure, and will be tested again from time to time to make sure the pipe hasn’t deteriorated further.
This feature is presented by Ferret - www.ferret.com.au.