National Offshore Petroleum Safety and Environmental Management Authority

Submission – General Direction No. 1897 – Enfield RTM Fortnightly Report – 2023-03-17 A921245 - Submission - General Direction No. 1897 - Enfield RTM Fortnightly Report - 2023-03-17 (a928045)

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NOPSEMA issued General Direction No. 1897 to Enfield riser turret mooring (RTM) registered holders requiring fortnightly monitoring and reporting of the Nganhurra RTM through decommissioning. As of 17 March 2023, the RTM remained afloat with a draft of 75.8 metres, navigation lights operational, and draft monitoring system online. The facility faced risks of navigational hazard from vessel collision, adverse weather, mooring line failure, and corrosion. Control measures included a 500-metre exclusion zone on marine charts, impressed cathodic protection, and internal coatings, though internal coating in Compartment 3 showed corrosion and was potentially no longer effective. The direction required immediate notification of RTM status changes and NOPSEMA-approved risk assessments and control measures.

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