Floating Production System
The Floating Production System (FPS) for the Equus development consists of a semi-submersible vessel moored in approximately 1070 m water depth.
The production system will include inlet reception, gas dehydration and compression, MEG/condensate separation, MEG regeneration and reclamation, water clean-up and disposal and condensate export. In addition, the platform will have utility systems, including but not limited to heating and cooling medium systems, compressed air, nitrogen, firewater, living quarters, helideck, and liferafts.
The FPS will be permanently moored using a catenary mooring system. The topsides will have a dry weight in the order of 15,000 tonnes, and the hull will have a dry weight of approximately 25,000 tonnes.
Some of the key dimensions of the facility are:
- Hull draft in operating condition – 32m
- Air gap to underside of topsides – 26m
- Hull keel to top of legs – 58 m
- Hull width and breadth (outside of legs) – 84m x 84m
- Mooring arrangement – 4 x 4 chain and wireTopsides lower deck to main deck (TOS) – 16m
- Topsides length (excluding flare boom and heli deck overhang) – 105m
- Topsides width – 60m
- Flare boom length – 85m
Gas Export Pipeline
The Export Pipeline system will be installed in Phase 1 and will consist of a 508 mm (20”) diameter carbon steel pipeline between 120km and 285km in length depending on the final selected tie-in location. The export pipeline will be connected to the FPS by a 406mm (16”) diameter, 3000m long carbon steel LWSCR.
It is anticipated that the Export Pipeline will be tied into the third party facility using a pipeline end manifold (PLEM) which may include a pressure protection system (PPS)
A control umbilical will be required between the third party host facilities and the PLEM/PPS structure.
All connections between the Export Pipeline and the third party tie-in connection will be diver assisted, bolted, flanged connections.
Depending on the tie-in location, the Export Pipeline may be routed in water depths up to 1400m and traverse the continental shelf escarpment where the water depth changes from 1050m to 250m over an 8km length of the route. At localised areas along this crossing, gradients approaching 40° are encountered.