Question 183Steam Plants - QMED

The correct answer is B) Closing the water seal line to the packing gland. Closing the water seal line to the packing gland of a centrifugal condensate pump would prevent the pump from developing its rated capacity. The water seal line is essential for maintaining the proper lubrication and cooling of the pump's packing gland. Without the water seal, the packing gland would overheat, leading to increased friction and reduced pump efficiency, ultimately preventing the pump from reaching its rated capacity. The other options are incorrect because: A) Flooding the main condenser hotwell would not directly affect the pump's capacity, C) Operating the pump with a positive suction head would not prevent the pump from developing its rated capacity, and D) Venting the pump to the vacuum side of the condenser would not cause the issue described.