Description of Incident
An inlet separator water boot level control valve failed to close at a Gas Processing Facility, causing both water and gas blow-by to the puraceptor. The on-call Operator assumed the valve had failed closed. The Loss of Containment was identified by the Operator when they arrived on site the next morning. The blow-by lasted for approximately 12 hrs 40 mins. Discharge of methane was calculated to be approximately 2,300kg (Tier 2 release).
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