A1208486 - Submission - IVT14016 - MOC - 16 Minerva Plastic Saddle Debris - Redacted

Written by Claude Haiku 4.5 from the extracted text on 27 Feb 2026. It can miss or misread redacted and scanned pages. Check the source before relying on it.

This Management of Change submission addresses an unplanned release of plastic piggyback clamps during decommissioning of the Minerva pipeline in Commonwealth and Victorian state waters. Subsea7 released approximately 186 kg of polypropylene clamps (as of May 5, 2025) while cutting and recovering the 10 km pipeline bundle during operations conducted by the Seven Sisters vessel. The 20-year-old pipeline was secured by approximately 1,600 clamps with a 20-year design life, and structural degradation likely contributed to clamp dislodgement. An environmental risk assessment identified potential long-term impacts from plastic degradation, short-term ingestion risks to marine fauna, and aesthetic/reputational concerns from debris washing ashore on the Otway coastline. The MOC seeks to address environmental impacts and risks not previously envisioned in the existing Minerva Decommissioning and