Neptune Marine Services Ltd (Neptune) recently completed the fabrication of the largest concrete mattresses to be utilised for subsea stabilisation, in the company’s history.
The mattresses, which will be used as crossings supports for the 42” GEP pipeline at the crossing intersections of the existing four cables on the INPEX-operated Ichthys LNG Project in Darwin harbour (North Telstra Telecommunications, North Power, South Telstra Telecommunications and the South Power Cables), range in length from 12m to 15m. The largest of which weigh 34 tonnes and have a design life of 40 years.
Neptune completed the stability analysis of the mattresses, to verify the third party design and designed a purpose built transportation spreader beam arrangement, which is equipped to freight mattresses of this size.
Neptune’s Chief Executive Officer, Robin King, said “this was a unique project that demonstrates Neptune’s expertise in the design and manufacture of solutions for subsea stabilisation and protection. The completion of this project also coincided with our subsea stabilisation business celebrating four years Lost Time Injury (LTI) free, which was a significant safety milestone.”