PetroStreet

Copying from an incident reported in 2012;

What Happened:
Ice formation was reported on the 3rd stage relief line on the associated gas compressor. A
pinhole leak was found and a wrap temporary repair was effected, following Technical
Authroity approval. The wrap was applied by a specialist vendor.
Approximately 9 days later a smell of gas (confirmed using ‘snoop’) was picked up at the wrap
repair. Bubbling & discolouration of the wrap was also noticed suggesting the wrap had
failed.

Lesson Learnt:
The cause of the wrap failure was initially thought to be insufficient curing time of the resin,
however following further analysis it was established that the surface temperature of the
pipework during application of the wrap was too low leading to a lack of adhesion between the
wrap material/resin and the pipework. It was also considered that inadequate pressure being
applied during the wrap application contributed to the premature failure of the repair which
was identified as a contributory factor.
The lesson learnt is to always ensure the pipe having the wrap applied is brought up to the
correct temperature, as per manufacturers guidance prior to application of the wrap.

Attached is the full form for reference.
For sharing & discussion purposes.

There are instance where temporary repairs have failed and the major reason include:
1. Engineering standards non-compliance
2. Lapse inspection /maintenance
3. Installation practices
I recall a case where a box-up repair was carried out by an external contractor which upon no proper sealing injection started leaking within 2 years time.

Thanks for sharing this.

BP Grangemouth Refinery reported a failure from a temporary repair actually happened due to lack of attention towards converting a temporary repair to a permanent solution.