Question 57Steam Plants - QMED

The correct answer is A) a water seal line to the packing gland. The water seal line helps prevent air leakage into the pump casing by maintaining a positive pressure at the packing gland. This water seal creates a barrier that stops air from being drawn into the pump suction, which could disrupt the pump's operation. The other options are incorrect because: B) an air seal line would not effectively prevent air leakage, C) special packing alone may not be sufficient to stop air intrusion, and D) the vacuum in the pump suction would actually draw air into the casing if not properly sealed.