Mokveld delivered the first local pressure control loop with a pressure transmitter directly connected to the control valve in the Far East almost 10 years ago.
This was a back-pressure control application, with a conventional gas driven actuator.
Building on this solution, Mokveld recently commissioned the first electric driven ‘self-acting’ control valve in a European gas plant, at a pressure reduction station.
The pressure transmitter is directly connected to the electric drive while the PID controller in the drive controls the downstream pressure.
In this specific case, a remote set point allows modification of the controlled pressure depending on the requirements from the central command centre, for example in summer there is lower pressure than in the winter.
Mokveld replaced a natural gas driven control loop for a solution which resulted in virtually no emissions. The carbon footprint is vastly reduced, but also the lifecycle cost is improved.
The volume downstream of the control valve is very big and this allows for the control loop to be stay-put upon loss of electric power. In case of an electric power failure, a generator is started and the client’s service engineer is warned and will go directly to site.
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