Question 267General Subjects - QMED
70% to passWhen repacking a stuffing box fitted with a lantern ring, which of the following precautions should be observed?
ABe certain that all packing is fitted loosely to the shaft.
BReplace all of the packing rings.
CFor good lubrication, apply a fine grade lapping compound between the shaft and packing.
DBlock off the sealing water connection.
AI Explanation
The correct answer is B) Replace all of the packing rings. When repacking a stuffing box fitted with a lantern ring, it is important to replace all of the packing rings to ensure proper sealing and prevent leaks. Partial replacement of the packing could lead to uneven compression and improper fit, compromising the integrity of the seal. The other answer choices are incorrect - A) is too loose, C) could damage the shaft, and D) is unnecessary. Replacing the entire set of packing rings is the proper procedure to follow when servicing a stuffing box with a lantern ring.
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