Optical system speeds mooring chain inspection offshore Angola

Sept. 23, 2019

Offshore staff

HALIFAX, CanadaWelaptega has deployed its optical chain measurement system (CMS) for a mooring inspection campaign for BP in block 31 offshore Angola.

The contractor applied the CMS with its new edge tracking data system for inspecting the mooring system of the FPSO PSVM.

Welaptega says its approach, involving use of optics, allows diameter measurements to be taken from video frame grabs, without the need for equipment to grip onto the chain. It involves taking three measurements from one placement, allowing an inspection to be completed 40% faster than traditional methods, the company claims.

The CMS comprises four video cameras (rated to water depths of up to 3,000 m/9,842 ft), integrated LED lighting control, and a topsides digital recording system that collects video of the measurement locations.

The new edge tracking software allows the data to be processed and the measurement results delivered offshore.

Tyler de Gier, Welaptega’s general manager, said: “The warm waters found off the coast of Angola can lead to some of the highest corrosion rates around the globe and because of this it is vital that operators have accurate data on the integrity of their safety critical systems that are susceptible to corrosion.

“However, the near-constant long period swells and resulting vessel motions in this region make it a challenging area for deploying equipment and collecting measurement data.

“Our innovative optical CMS calliper allowed us to collect accurate data quickly and we were able to complete the full campaign ahead of our predicted schedule.”