Client: MODEC Offshore Production Systems
Process: Offshore Seawater Reverse Osmosis
Country: Malaysia, Ghana
Contract Description: Seawater Treatment System
Contract Date: January 2014
Contract Completion Date: December 2014
Capacity: 210,000 BPD (33,390 m3/day)
Sea Water Conversion: 75%
The project is for the design and supply of a sea water treatment plant sized for 210,000 BPD (33,390 m3/day) feeding miscellaneous users including an integrated seawater reverse osmosis (SWRO) system with a capacity of 13,200 BPD (2,100 m3/day) for the Tullow TEN FPSO, which will operate in the Deep Water Tano (DWT) block, offshore Ghana.
The project scope consists of a Seawater Treatment Plant in a single module arrangement comprising: Seawater Coarse Strainers, Vacuum Deaerator Package, SWRO HP Feed Pumps, Guard Cartridge Filters, SWRO Trains, CIP (Clean In Place) System, Piping, Valves and Instrumentation.
Raw water from seawater lift pumps is routed to the inlet coarse strainers rated at 40µm. The inlet strainers are designed for 2 x 100% operation with automatic back-wash facility. The filtered seawater is used as source water for several users, including the water injection system, cooling water exchangers, electro-chlorinator, and fresh water maker. The filtered seawater is then routed to the Vacuum Deaerator (1 x 100%), which reduces the seawater oxygen content to 20 ppb (wt) residual oxygen, without use of oxygen scavenger. The deoxygenated water is then routed to a set of Booster Pumps, which in turn feed the SW Injection pumps.