Why are geared turbine installations...

Question 1 / 270705eccefa1bacbc34ba4d471a2

Question 1 of 270705eccefa1bacbc34ba4d471a2

Why are geared turbine installations equipped with turning mechanisms?

Question 1 of 27070

Why are geared turbine installations equipped with turning mechanisms?

🔍 Key Concepts

• Purpose of a turning (jacking) gear on large main engines and geared turbines • When the main engine needs to be rotated at very low speed (e.g., inspection, warm-up, securing) • Safety reasons for slow, positive positioning of the shaft and turbine rotor

💭 Think About

• Think about all the situations when the main engine must be turned slowly without starting it under its own power. • Which operations require the shaft to be held in a specific position or moved a small amount, and why is that important? • Is the turning gear limited to just one operating condition, or is it designed for several different purposes throughout the operating cycle?

✅ Before You Answer

• List the typical uses of a turning/jacking gear mentioned in your engineering texts or class notes. • Check whether it is used only when the vessel is secured, or also for inspection, warm-up, and shutting down. • Verify if the safest answer covers all normal operational needs for slow controlled turning of the main engine.

Question 1 of 27070

Why are geared turbine installations equipped with turning mechanisms?

For jacking the main engine over periodically when secured.

For turning the main engine during routine inspections.

For turning the main engine during warm-up and securing operations.

For all of the above purposes.

Question 1 / 270705eccefa1bacbc34ba4d471a2

Question 1 of 270705eccefa1bacbc34ba4d471a2

Why are geared turbine installations equipped with turning mechanisms?

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Question 1 of 27070

Why are geared turbine installations equipped with turning mechanisms?