What is least likely to be used to strip a cargo tank?

When considering the use of various types of pumps for stripping a cargo tank, it's essential to understand their operating principles and suitability for different tasks. A centrifugal pump is primarily designed for transferring liquids efficiently, particularly in high-flow situations. However, one of its limitations is that it is not well-suited for handling very low liquid levels or for creating the suction necessary to strip a tank completely. This is because centrifugal pumps require a sufficient amount of liquid to maintain their prime and create the necessary momentum for operation.

In contrast, rotary pumps, eductors, and reciprocating pumps are typically more effective for stripping applications. Rotary pumps can handle viscous fluids and lower levels of liquid more easily, while eductors utilize a high-velocity jet of fluid to create a vacuum, effectively pulling the remaining cargo out. Reciprocating pumps can generate higher pressures and produce a strong suction, making them suitable for removing stubborn residues in a tank.

Given these characteristics, the centrifugal pump is least likely to be used for stripping a cargo tank due to its efficiency being significantly diminished under low liquid conditions, making it less practical for completely emptying tanks compared to the other options.