The shaft sleeves have recently been replaced on a centrifugal salt water service pump. The packing gland is now drawn tightly up against the casing. Despite the use of standard procedures to tighten the packing gland, water continues to pour out along the shaft. The probable cause for this situation is that __________.
• stuffing box operation and purpose • role of the lantern ring and sealing water in a centrifugal pump • what happens when the packing gland is over-tightened but leakage still occurs
• Think about why water would still be pouring out even though the packing gland is fully tightened against the casing—what does that tell you about the packing and internal parts? • Which component inside the stuffing box must be complete and correctly installed so that sealing water is distributed properly around the shaft? • Consider which option describes a condition that would let water bypass the packing instead of being properly controlled by it.
• Verify which choice directly affects how sealing water is distributed inside the stuffing box, not the external system pressure. • Check whether an O-ring on the shaft sleeve would cause visible leakage at the stuffing box or somewhere else in the pump. • Make sure you understand how many pieces the lantern ring is typically made of and what happens if it is incomplete.
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