Question 373General Subjects - Assistant Engineer

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.