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

Correct Answer: Option C — replaced with a satisfactory spare

Centrifugal pump shafts operate at high rotational speeds; any distortion creates significant vibration, leading to bearing failure and seal leakage. Straightening a bent shaft is rarely successful due to residual stresses and potential for fatigue. Replacing the shaft with a factory-certified spare is the only acceptable practice for reliable maritime operations.