A key operational advantage of an electrical submersible pump set installed inside a deep tubewell over a surface centrifugal pump is that:
Options:
(A) It is completely submerged below the dynamic water table, totally eliminating suction lift limitations and priming requirements
(B) It operates without consuming any electrical energy
(C) It does not require any casing pipe in the tubewell
(D) It can only pump pure distilled water
Answer Key:
A
Step-by-Step Solution & Explanation
Submersible pumps feature a hermetically sealed electric motor close-coupled to a multi-stage centrifugal pump assembly positioned below the lowest drawdown level. Because positive hydrostatic pressure exists at the inlet, there is zero suction lift, no priming is ever needed, and cavitation risk at the suction eye is effectively minimized. Option A is correct.