Problem Statement
- The 60-bar pipeline gas supply experienced a leak to the atmosphere (LOPC).
- Depressurizing the pipeline prior to composite repair work was not feasible.
- Disruption of preventive and corrective maintenance activities on the pipeline.
Challenges
- Small-footprint, fit-for-purpose equipment required.
- Logistical constraints due to the remote location.
- Compatibility of sealant injection point.
- Rectification of leaks on a live pipeline.
Objective
- To seal the gas leak at the pipeline valve drain line internally before performing subsequent external repair work to isolate the leak.
- Utilize an effective sealant placement method through a high-capacity, pressure-rated injection cylinder.
Solutions
- Pipeline Leak Diagnostics: Conducted a bubble test to identify the leak.
- Sealant placement through injection cylinder into the valve grease port.
- Applied a proprietary pressure-activated sealant (PAS) suitable for pipeline leaks.
- Rectification Acceptance Criteria: No LOPC observed after rectification.
Results
- Successfully injected controlled amount of PAS to seal the 60-bar pipeline leak.
- No LOPC recorded post-sealant treatment.
- Fit-for-purpose equipment performed as intended.
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