THE BOILER FEED PUMP IS COUPLED WITH ITS DRIVING MOTOR THROUGH HYDRAULIC COUPLING.THE HYDRAULIC COUPLING SERVICES THE PURPOSE OF CONTROLLING THE SPEED OF FEED PUMP FOR MAINTAINING ADEFINITE DELIVERY HEAD AND QUANTITY OF THE PUMP AS PER REQUIREMENT OF THE BOILER.
THE SPEED CONTROL IS DONE WITH HELP OF SCOPE OF HELP OF SCOOPE TUBE ALTERATIONS WHICH CONSEQUENTLY ALTERS THE OIL QUANTITY MAINTAINED BETWEEN THE DEVICES TRANSMITTING POWER FROM MOTOR SHAFT TO PUMP SHAFT.THE OIL QUANTITY TO THE HYDRAULIC COUPLING IS SUPPLIED UNDER PRESSURE BY AUXILLIARY LUBRICATING OIL PUMP BEFORE STARTING OF THE FEED PUMP AND WHEN THE FEED PUMP HAS STARTED THE OIL PRESSURE IS SUPPLIED BY THE SHAFT DRIVEN LUBRICATING OIL PUMP AND AUXILLIARY LUBRICATING OIL PUMP GET TRIPPED
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