Question 21 of 30
Select the correct point regarding the operation of the portable pumps?
Before using portable pump, rig the pump on the deck and while pumping, lower the hose in the tank
When the liquid cargo level goes down, lower the hose accordingly, keeping the rigged pump on the deck
Make sure that the portable pump is completely submerged and lowered till the bottom of the tank and then start the pumping operation
Ensure that only the lower half of the pump is submerged and is lowered as the cargo level falls.
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Answer & Explanation
The correct answer is Option D: Ensure that only the lower half of the pump is submerged and is lowered as the cargo level falls..
When operating portable cargo pumps (such as submersible hydraulic or pneumatic pumps) on a tanker, it is critical to ensure the pump's suction end/lower half remains submerged in the liquid cargo, lowering it progressively as the level falls. This prevents dry running, loss of prime, and air entrainment while avoiding unnecessary full submersion of the pump's power head.