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Reducing (natural gas) emissions with an electric actuator

The hydrocarbon market is experiencing an electrification and Mokveld is part of that with electric actuated valves.

At present the energy for actuators of critical or severe service control valves and on/off valves is mainly from air supply. Actually in many cases natural gas is still used as supply fluid in remote locations.

In view of sustainability and the carbon footprint natural gas as supply fluid should be reconsidered. Often both the valve / actuator and the control unit (e.g. pressure controller) cause fugitive emissions to atmosphere. Not taking the stem seal in account this could easily add up to 15.000 Nm3/year which is a CO2 equivalent of 1.500 tons per year per valve.

Air supply is not a very good alternate either, related to both cost and efficiency. Especially when high availability of the installation is required compressed air (or nitrogen) is expensive, resulting in high initial investment (CAPEX) and high operational costs (OPEX). An electric actuator reduces natural gas emissions and reduces both CAPEX and OPEX.

Where the availability of the electric power cannot be guaranteed low power electric actuated valves may be a very good solution. Direct Current low power actuators may be connected to the UPS of the plant. In some cases the valves may be connected to generators that are started up when the main power fails.

Mokveld axial flow pressure balanced valves require very low forces to move and may therefore be equipped with low power electric actuators.