LNG-service piping — welded branch leak
Field Reality
LNG-service pipework cycling rapidly between a warm state of roughly 10–50 °C and a reported cryogenic phase near −173 °C. The leak was reported at a branch-to-header weld — the point where two different thermal responses meet. Frost stood on the operating pipework during the cryogenic phase, which is how the condition announced itself.
Key verified Field facts
- Medium
- LNG operator-reported service
- Temperature
- Warm state approximately 10–50 °C, cryogenic phase reported near −173 °C operator-reported; describes this Case and its transitions, not a continuous-service rating
- Asset
- LNG-service pipework with welded branch connections operator-reported
- Geometry
- Branch-to-header welded connection observed in the Field record
- Field condition
- Reported leak at a welded branch, under rapid warm-to-cryogenic cycling; localised frosting visible during the cryogenic phase observed in the Field record
- Dominant hazard / constraint
- Repeated differential thermal movement at a welded geometry an engineering consideration for this Case; the record does not establish root cause
Resulting ISB
Case-specific ISBs were constructed around the welded branch connections and given a fibre-reinforced external protection layer. The completed bodies were observed in place during the reported cryogenic operating phase.
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
The connection layer between the Field and DendroSeal. Reality can arrive before anything else is settled.