- Single Buoy Moorings Inc.


- Sulphate Removal


- Monaco, Switzerland, Angola

Contract Description: 

- Supply of membrane plant for sulphate removal

Contract Date: 

- May 2006

Contract Completion Date: 

- April 2007


- 125,000 BPD (19,875m3/day)

Sea Water Conversion: 

- 75%

Sea Water Feed Quality: 

- 36,000 mg/l (tds)

Fresh Water Output Quality:  

- 40 mg/l sulphate


Project Description:

The Project is for the design and supply of a seawater treatment plant sized for 125,000 BPD (19,875 m3/day) of low sulphate water for FPSO Mondo, which will operate in the Block 15 Field, offshore Angola.

Project Scope:

The Project scope consists of a multi-skid arrangement comprising: Guard Cartridge Filtration, HP Feed Pumps, Sulphate Removal Membrane System, Chemical Cleaning System, Chemical Dosing Systems, Control Valves and Instrumentation.A Service Water System is also provided, sized for 6,945 BPD.

Process Description:

Fine filtration is achieved by a set of cartridge filters to provide fine filtration down to 5µm prior to membrane trains. The set of cartridge filters supplies feed water for three (3) trains.

The conditioned water, boosted to the required feed pressure, enters the Sulphate removal trains. Each membrane train is fitted with pressure vessels containing SR90-440i nanofiltration elements.A recovery of 75% is achieved by a 2:1 brine staged configuration. Brine reject from the process is discharged overboard, while the low Sulphate permeate is routed to a vacuum deaerator (provided by others). A dedicated clean in place (CIP) package, consisting of cleaning tank, pump, heater and cartridge filter vessel is provided for membrane cleaning purposes. An SWRO package plant is provided to supply wash water for the main process plant. Chemical Dosing systems for the SRP system and the Client supplied equipment (pre-treatment and deaerator) are also provided.