The new Petrobras-63 Floating Production Storage and Offloading (FPSO) vessel, NISA, featuring Wärtsilä 50DF dual-fuel engines, the first such ship to utilize gas engines to produce more than 100 MWe of power, has successfully completed all the required full 100% load tests. The tests were carried out at the Cosco shipyard in Dalian, China and the vessel will commence operations in Brazil’s offshore oil fields in 2013. The vessel is 342 metres in length, with a moulded breadth of 57.36 metres and a moulded depth of 28.5 metres. It was converted from a 320 000-dwt ULCC, built in 1983. NISA has a daily production capacity of 140,000 barrels of oil (bopd) and 35 million cubic metres of gas. The storage capacity by design is 1.4 million barrels and the operating depth is 1,200 metres. Classified by ABS, NISA is equipped with a spread mooring system and is designed to work for 25 years successively without docking work.
With this validation of NISA’s capability to fulfill all the required performance criteria as part of a complex offshore project, the viability of Wärtsilä’s dual-fuel technology is again verified. The Wärtsilä dual-fuel engines are capable of being run on treated well gas or treated crude, as well as marine diesel oil (MDO), which means that virtually no MDO will need to be shipped to NISA. This will notably reduce operating costs. Furthermore, this efficient gas-fired power solution will also have significantly lower levels of CO2 emissions compared to conventional technologies. In real terms, it is estimated that the level of carbon emissions will be reduced by as much as 93,000 tons per year.
The integrated power modules offers great fuel flexibility
Wärtsilä was contracted by the Brazilian industrial group QUIP, to provide a turnkey package for this vessel. The package includes three main power modules, each comprising two 18-cylinder 50DF engines in V-configuration, alternators and all required auxiliary equipment, as well as commissioning, start-up, and operational supervision.
“This validation of the engine builder technology represents a milestone event, and one that demonstrates Wärtsilä’s capability to execute complex integration projects for the oil and gas industry with a solution that contributes notably to successful client operations. The company’s turnkey project model is an effective means to enhance project completion targets. We have enjoyed working closely with our client, QUIP, and look forward to the final tests when the FPSO is on location at Brazil’s offshore Papa-Terra field,” says Magnus Miemois, Vice President, Solutions, Wärtsilä Ship Power Offshore.
Wärtsilä's 18-cylinder 18V50 DF supplies 16,700 kW at 514 rpm
images / graphs: courtesy of Wärtsilä