What are the operational steps for isolating a condensate pump for maintenance during the normal operation of a steam turbine unit?
Thread Content
What are the operational steps for isolating a condensate pump for maintenance during the normal operation of a steam turbine unit?
First, the interlock of the pump to be serviced must be disabled, and the on-site switch must be switched to the stop position. Close the valves at the inlet and outlet of the pump that is to be repaired; in addition, blind flanges should be installed on the valve at the pump inlet and on the valve leading back to the surface cooler, in order to prevent leaks from the valves and avoid disruption of the vacuum level inside the surface cooler.
After the backup pump is started, adjust the outlet valve of the operating pump according to the flow rate; finally, close the outlet valve completely, close the inlet valve, shut off the water supply for sealing, and activate the pump’s drain system. Obtain an outage permit, and then the pump can be handed over for maintenance. The difficulty in carrying out these operations lies in monitoring flow rate changes – it may be necessary to remove steam condensate from the system, and it is essential not to disrupt the vacuum