🔍 Key Concepts

• Safe operating condition of rotating machinery (especially pumps) • Manufacturer’s recommendations for critical shafts • Risks of altering the original strength, balance, and alignment of a shaft

💭 Think About

• Which option best preserves the original mechanical properties and balance of a high‑speed rotating shaft? • What are the potential consequences if a repaired shaft fails suddenly in service? • On board, what is the usual practice when a critical rotating part is significantly bent or distorted?

✅ Before You Answer

• Identify which options involve permanent alteration of the damaged shaft versus using an undamaged part • Consider which actions may introduce hidden cracks, residual stresses, or imbalance • Think about standard shipboard practice with critical safety-related components: are they usually repaired in place or swapped out?