The low shear technology of the Typhoon® Valve System reduces the shear forces acting on dispersed fluid upstream of separation vessels and thereby increases the efficiency of the Compact Flotation Unit (CFU). Implementation of the Typhoon® Valve System is a simple and efficient solution for debottlenecking oil-water separation issues. The system retrofit does not require any modification to the separation vessel itself. In most cases, it is simply replacing the existing control valve.
Conventional choke and control valves are known to break droplets of a dispersed flow. The high turbulence encountered in control valves creates high shear forces that act on the fluid.
In close co-operation with Typhonix A/S, Mokveld Valves BV produce a control valve that reduces the emulsification and droplet breakup seen in conventional control valves, the Typhoon® Valve System.
This ONS 2018 award winning innovation has consistently shown in laboratory tests that under identical conditions, the droplet size exiting the valve is on average twice as large in comparison to those exiting a conventional globe valve. In field trials, executed at Equinor facilities, the technology shows that the water quality exiting the first stage separator improves by 40-60%.
An Operator in Western Australia, charters an FPSO which produces 144,000 bbl/day of water, a by-product of oil and gas production. At least 90% of the annual produced water volume is reinjected and during normal operations, 7% of the annual produced water volume will be discharged overboard.
Australian National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) sets a limit to the oil content in produced water prior to overboard discharge of less than 30 ppm.
The FPSO was brought to a shipyard in Singapore for upgrading the production capacity and extending the operational lifetime of the vessel. The upgrade included the installation of a CFU skid (Compact Flotation Unit) and a Typhoon® Valve System to improve the quality of the produced water satisfying the national environmental requirements.
The Typhoon® Valve System is installed in parallel to a conventional (globe) control valve and feeds the CFU.
With the CFU in steady operation, and with similar inlet feed oil concentrations (OiW ~110ppm), the oil concentrations out of the CFU where compared between the Typhoon® Valve System and the conventional valve feeding the CFU.
|Typhoon® Valve System||Conventional Globe valve|
|Flow rate [m³/hr]||52|
|Inlet pressure [bar-g]||4.5 - 5|
|Outlet pressure [bar-g]||2.3|
|OiW out valve [ppm]||113||107.3|
|OiW out CFU [ppm]||38.6||49.8|
The table above shows the actual operating conditions of both solutions during the comparison. The comparison shows that the Typhoon® Valve System delivers impressive improvement in water quality of ~23% over a conventional globe valve.
In order to ensure you continue to benefit from valves that offer high capacity and safety as standard, we offer a range of modernisation services. For more information about our modernisation services, please contact your Mokveld support office or representative.