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Thursday, June 20, 2019 

Evac is supplying a Cathelco marine growth prevention system (MGPS) to protect seawater pipework on the 'Ngujima-Yin', a FPSO facility operated by Australian natural gas producer Woodside.

The Ngujima-Yin is located over the Vincent oil field in Western Australia, 50km north-west of Exmouth. Production will resume shortly  following modifications on the facility which will be connected by a 31km subsea tie-back to the oil accumulations from  the Greater Enfield fields.

The Evac MGPS system will eliminate blockages in seawater pipework caused by the growth of barnacles and mussels, thereby saving on maintenance costs throughout the life of the vessel.

Cathelco, part of the Evac Group since 2018, has supplied MGPS systems to protect seawater lift pumps for numerous FPSOs and offshore platforms. In most cases, pairs of copper and aluminium anodes are mounted within the strainers of FPSOs where they can be changed at any time without the need for drydocking. However, where the drydocking interval is greater than 5 years, an electrolysis tank system is often the most practical option. “Cathelco have many years of experience in the design of MGPS electrolysis tanks for offshore platforms. Our expertise and record of product reliability were important considerations in winning the contract”, said Andrew Gamble who supervised the project at Evac.

The MGPS electrolysis tank unit will be one of the most complex designed by Cathelco for an offshore production facility as it will treat seawater from three lift pumps, two of which will be in operation at any given time. “A key aspect of the project is the ability to dose water at high and low flow rates depending on the processes which are being carried out on the FPSO and the combination of pumps in use”, said Gamble.

The contract involved close technical co-operation between Woodside and Marine Plant Systems, Cathelco’s agent. The skid mounted electrolysis tank houses five copper anodes and the flow of seawater from each of the three lift pumps is controlled by automatic valves. It is installed with a self-cleaning filter to prevent the build-up of debris. Built to Hazard Area Zone 2 standards, the skid will incorporate a lifting facility which will enable the electrolysis tank lid to be removed safely and easily by the crew, simplifying anode renewal over the life of the system.

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