Oilers/Plant Tenders (HHC) Civil Service Practice Exam

If a leak is noticed around the piston rod of a double acting water pump, what is the first action to reduce the leak?

1. Tighten each hexagon nut on the packing gland one quarter turn

2. Tighten each hexagon nut on the packing gland one sixth of a turn

3. Replace the packing entirely

4. Lubricate the piston rod

The correct answer is: Tighten each hexagon nut on the packing gland one sixth of a turn

The first action to reduce a leak around the piston rod of a double acting water pump should be to make a slight adjustment to the packing gland. Tightening each hexagon nut on the packing gland by one sixth of a turn is often sufficient to compress the packing material around the piston rod, which can help to eliminate or reduce the leak without causing excessive wear or damage to either the packing or the piston rod. This approach allows for a minimal yet effective tightening that can restore the seal while preventing the packing from being overly compressed, which could lead to increased friction and premature wear. Adjusting the packing in small increments, such as one sixth of a turn, is crucial to maintain optimal pump performance and longevity. In contrast, tightening by one quarter turn may be too aggressive, increasing the risk of damaging the packing or creating excessive pressure, potentially leading to further leaks. Replacing the packing entirely is a more drastic step that may not be necessary at this stage and can involve significantly more time and effort. Simply lubricating the piston rod does not directly address the source of the leak, as it does not influence the tightness of the packing around the rod.