A pump shaft that is bent or distorted should normally be __________.

Correct Answer: Option A — replaced with a satisfactory spare

A bent or distorted pump shaft compromises rotational balance and mechanical seal integrity. Attempting to straighten or weld a shaft introduces residual stresses and potential fatigue cracks, which are unacceptable under marine engineering safety standards. Replacement with a certified spare ensures structural integrity and prevents catastrophic pump failure during operation.