Synopsis of work
The Correction of the GTS-1 20” Pipeline Eccentric Casing Project was initiated following the discovery of a loss of concentricity between the 20” GTS-1 gas pipeline and its 28” casing pipe at a major road crossing, caused by the collapse of pipeline spacers. The condition was identified through an Intelligent Pigging (IP) inspection conducted by NLNG, which revealed that the 20” carrier pipeline had come into contact with the 28” casing pipe, creating the risk of galvanic corrosion and compromising pipeline integrity.
Desicon Engineering Limited developed and executed a unique, fully in-house end-to-end solution. Desicon’s scope included the engineering design, execution, and correction works required to realign the 28” casing pipe with the 20” carrier pipeline, thereby restoring the pipeline’s concentric condition and safeguarding its long-term operational integrity.
Correction of the GTS-1 20” pipeline eccentric casing works comprised of the following:
Inspection of the Site upon Company's Contract Call-Off notification
Design of the pipe lifting and manoeuvre system to correct the eccentric anomaly.
Design of the pipe spacers and end seal caps.
Preparation of a work plan to be used to replace the damaged spacers and end seals in an efficient manner.
Procurement of the pipe spacers and end seal caps.
Mobilisation of personnel, equipment, and materials to the Site.
Repair of damaged Polyethylene (PE) coating.
Realigning the pipeline to a concentric position with the casing.
Holiday detection of coated/wrapped line pipes.
Re-commissioning and demobilisation from site.
