The process plant on the Sevan FPSOs is designed with basis in specification for the actual operation at a defined oil field. The main separation is normally designed as a generic unit that may serve a certain range of operational requirements. The gas treatment as well as the water treatment part of the process plant will to a larger extent be tailor made for the actual location. This design philosophy reduces the modification costs when a unit is relocated. For more long term installations, an optimized tailored process plant will be installed, e.g. as on the Sevan Piranema FPSO.

The design of the topside processing plant is made by the in-house expertise in Sevan Marine, Kanfa, Kanfa Aragon, Mator and Kanfa-Tec.

Functional description documents as FFD, P&IDs, cause and effect diagrams, commissioning procedures and operational man uals are established as a basis for the procurement of equipment, construction, functional testing, pre-commissioning, hook-up and commissioning of the topside modules.

The process system is constructed in modules, including the inlet and export manifold module, the separation, the gas treatment and the water treatment and injection module, the utility modules (chemical injection, FLare and drain systems), etc. The way of arrang-ing the modules depends on the complexity of the process and the functional requirements.The basic arrangement of the modules is in ‘open air’ resulting in good venitlation of any gas release. The Sevan FPSOs designed for operation in arctic areas will be built with a cover creating a good working environment for the crew and protecting the equipment from exposure to the arctic climate. The cover has a transperancy sufficient for maintaining natural ventilation.