Natural gas line — corrosion under insulation

Field Reality

A buried, insulated natural gas line was leaking beneath its insulation. The leak was audible before construction began. The line sat in an excavated, constrained space, so the working geometry was decided by the excavation rather than by preference.

Original Field audio. The leak is audible — that sound is part of the evidence, so it is preserved. Only the minimum segment needed to establish the existing condition is shown.

Buried insulated natural gas pipe in an excavated, constrained area. — Existing condition: the line as the excavation exposed it.

Key verified Field facts

Medium: Natural gas operator-reported service
Asset: DN100 steel pipe operator-reported
Geometry: Buried, insulated run in an excavated pit observed in the Field record
Field condition: Corrosion under insulation, with an audible leak before construction observed in the Field record
Dominant hazard / constraint: Escaping natural gas in a confined excavation with constrained access observed in the Field record

Resulting ISB

An ISB was constructed around the affected run inside the excavation, then given an armoured outer protection layer for buried service.

Field inspection of the constructed ISB on the buried gas line. — The constructed ISB at Field inspection.

Completed armoured outer protection over the ISB. — Armoured outer protection completed over the body for this buried configuration.

Case boundary

This Case records one unique Field Reality. It is not a construction instruction and not a template. A Solution developed for one Field must not be copied into another Field without new DendroSeal Understanding.

Field Link

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