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Story summary
- CalMac said a faulty valve released 700 kg of methane from the MV Glen Sannox.
- The gas vented for 12 minutes while the ferry carried 82 passengers from Arran to the mainland.
- Methane entered a ventilation intake, triggering generator-room gas alarms.
- CalMac described the event as a critical failure but said explosion risk was low.
- Wärtsilä supplied the ferry’s LNG propulsion system as a subcontractor to Ferguson Marine.
