Oil and gas company Baker Hughes has won the turbomachinery contract for BP’s Greater Tortue Ahmeyim Floating Liquefied Natural Gas (FLNG) development. The development, located offshore Mauritania and Senegal, will produce gas from an ultra-deepwater subsea system.

A mid-water floating production, storage and offloading (FPSO) vessel will process the gas and remove heavier hydrocarbon components. The gas will then be transferred to a floating liquefied natural gas (FLNG) facility at a near shore hub located on the Mauritania and Senegal maritime border.

GE company wins turbomachinery contract for Greater Tortue Ahmeyim project

Baker Hughes, a GE company, will provide the technology for four compressor trains for offshore gas liquefaction. Each of the four trains will consist of a PGT25+G4 aeroderivative gas turbine driving a centrifugal compressor. The PGT25+ G4 gas turbine family has over 560 units in operation. First introduced in the mid 2000’s, the PGT25+ G4 builds on the LM2500 and PGT25 families.

The company will also provide five large-bore deep water horizontal xmas trees (DHXTs), a 6-slot dual bore manifold, a pipeline end manifold, subsea distribution units (SDUs), three subsea isolation valves (SSIVs), diverless connections and subsea production control systems, specifically designed to enable the future integration of additional wells for the first phase of the development.

The initial subsea infrastructure connects the first four of 12 wells consolidated through production pipelines leading to the FPSO vessel. From there, liquids will be removed and the export gas transported via a pipeline to the FLNG hub terminal where the gas will be liquefied.

The turbomachinery will be controlled by GE’s Mark VIe control system, including integrated antisurge control. GE is also supplying eight anti-surge valves. These valves are designed for centrifugal compressor anti-surge and recirculation loops and ensure precise control over the operating conditions, delivering maximum equipment protection and uptime for the facility.

GE will provide key engineering staff and fabrication facilities to support deployment of its technology. The company’s service and support contract extends to three maintenance cycles – totalling twenty years – and will deliver a guaranteed availability rate of 98.9% from the equipment.

The Greater Tortue Ahmeyim project is expected to provide around 2.5 million tonnes of LNG per annum on average, with the total gas resources in the field estimated to be around 15 trillion cubic feet. The project, the first major gas development to reach FID in the basin, is planned to provide LNG for global export as well as  making gas available for domestic use in both Mauritania and Senegal.

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