Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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When should packing glands of reciprocating pumps or compressors generally be tightened?

When the machine is in operation
At the beginning of every shift
Before the machine is started each day
When the machine is shut down overnight

The correct answer is: When the machine is shut down overnight

Tightening the packing glands of reciprocating pumps or compressors is best performed when the machine is shut down, particularly overnight. This is important because, during operation, the packing material is subjected to high temperatures and pressures, which can lead to deformation. Adjusting the packing while the machine is in operation can cause damage to the packing and the shaft, potentially leading to leaks or equipment failure. Doing this maintenance task while the machine is shut down allows for a thorough inspection without the risk of injury from moving parts or the equipment's operational hazards. Additionally, making adjustments to the packing in a non-operational state helps ensure that the correct pressure and tightness can be applied without the influence of mechanical stresses, resulting in more effective sealing and reduced wear on the components over time. Implementing packing gland adjustments at the beginning of each shift or before the machine starts may not provide the same level of assurance against potential hazards or mistakes. Therefore, performing this task when the machine is completely off is the safest and most effective practice.