We struggled with venting the air out of the cooling water after draining an engine, but think we have found a good solution after our last outage. Before starting the engine, start the maintenance water pump and add water to the engine through the LT and HT water pump suctions. This will increase the pressure on the LT & HT pump discharge and prevent a trip. We kept the maintenance water pump running until pressures stabilized – the expansion tank was overflowing back to the maintenance water tank before we shut off the maintenance water pump.
Mike