During the Special Survey the propeller is...

Question 1 / 270705eccef9cbacbc34ba4d45a9c

Question 1 of 270705eccef9cbacbc34ba4d45a9c

During the Special Survey the propeller is removed and shaft pulled into the vessel. Which of the following tests must be performed on the propeller shaft prior to refitting?

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Question 1 of 27070

During the Special Survey the propeller is removed and shaft pulled into the vessel. Which of the following tests must be performed on the propeller shaft prior to refitting?

🔍 Key Concepts

• Tailshaft surveys and why classification societies focus on high-stress areas instead of low-stress areas • Where maximum bending and stress concentrations typically occur on a propeller shaft (think: tapers, keyways, fillets, and changes in diameter) • Use of non-destructive testing (NDT) (like dye penetrant or magnetic particle) on areas most prone to cracking

💭 Think About

• Among the listed options, which part of the shaft is most likely to develop fatigue cracks due to repeated loading from the propeller? • Is it standard practice to NDT every square inch of a long, uniform shaft, or to concentrate on specific high-stress features? Why? • Consider what happens at the junction between the shaft and the propeller hub: which geometric feature there makes it a classic stress-concentration point?

✅ Before You Answer

• Identify the highest stress region of the shaft when transmitting torque to the propeller (think taper, key, keyway, radius changes). • Decide whether survey rules typically require NDT on localized critical areas or on the entire shaft length. • Verify which option best matches how NDT is actually applied in practice during a special survey of the tailshaft.

Question 1 of 27070

During the Special Survey the propeller is removed and shaft pulled into the vessel. Which of the following tests must be performed on the propeller shaft prior to refitting?

The propeller flange must be checked for cracks using non-destructive testing.

The shaft weight must be checked prior to refitting.

The tapered section must be checked for cracks using non-destructive testing.

The entire shaft must be checked for cracks using non-destructive testing.

Question 1 / 270705eccef9cbacbc34ba4d45a9c

Question 1 of 270705eccef9cbacbc34ba4d45a9c

During the Special Survey the propeller is removed and shaft pulled into the vessel. Which of the following tests must be performed on the propeller shaft prior to refitting?

Back

Question 1 of 27070

During the Special Survey the propeller is removed and shaft pulled into the vessel. Which of the following tests must be performed on the propeller shaft prior to refitting?