Life extension of mooring systems


The Horn Mountain SPAR was projected to continue production past the original design life. To facilitate the new operating period, Occidental Petroleum contracted Welaptega to provide quantifiable asset data in support of detailed mooring life extension assessments.

The solution

Welaptega provided a turnkey inspection service, generating real-world data including mooring chain measurements, 3D modelling, and wire rope cleaning and inspection.

Welaptega worked in conjunction with engineering contactor TechnipFMC over a one-week period to execute the life extension inspection on the Horn Mountain SPAR, moored at 5,400ft water depth. Welaptega’s trained mooring inspectors used our optical Chain Measurement System (CMS), 3D Modelling, and mooring Rope Cleaning and Inspection System (RCIS) to gather the critical data.

Results

Welaptega used a progressive inspection framework to efficiently gather the most valuable data while using offshore vessel time effectively. Chain measurements were used to calculate wear/corrosion rate and estimate future service life, with close visual inspection (CVI) of wire ropes following cleaning by the RCIS in order to assess wire rope condition. 3D models were used for finite element strength analysis, with an error tolerance of less than 0.1%.

The mooring life of the Horn Mountain SPAR was extended thanks to the highly-accurate results and fast data delivery of Welaptega’s systems.