Question 373General Subjects - Assistant Engineer
70% to passWhen repacking a stuffing box fitted with a lantern ring, which of the following precautions should be observed?
AFor good lubrication, apply a fine grade lapping compound between the shaft and packing.
BReplace all of the packing rings.
CBlock off the sealing water connection.
DBe certain that all packing is fitted loosely to the shaft.
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 best practice to replace all the packing rings to ensure a proper seal. Reusing old packing can lead to leaks and potential damage to the shaft. Replacing all the packing ensures a uniform, tight fit that will effectively prevent water intrusion. The other options are incorrect because: A) Using a lapping compound is not necessary and could potentially damage the shaft. C) Blocking the sealing water connection is not required when repacking the stuffing box. D) The packing should be fitted snugly, not loosely, to the shaft to create an effective seal.
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