Rigging and lifting wire and tackles assignment 2

RIGGING AND LIFTING - WIRE & TACKLES ASSIGNMENT 2 NAME:_______

These assignments check your understanding of Marine Orders 32 Cargo Gear, the Lessons & the Workbook.
Apply seamanship skills aboard a vessel up to 12 metres
Perform seamanship operations on board a vessel up to 24 metres

Question 1. How is the size and quality of steel wire rope classified?

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Question 2. Explain 'Langs' lay and where this type would be used.

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Question 3. Give some examples of wire rope deterioration.

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Question 4.List six precautions in the use of steel wire rope?

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Question 5.How should a wire rope be wound on a drum if it is R.H.O.L.?

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Question 6.What is the purpose of the Core or Heart?

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Question7. How would you determine the permissible number of broken wires of a S.W.R.

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Question 8. What is the S.W.L. of -

a) 20 mm S.W.R

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b) 20 mm Grade 2 mild steel chain.

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Question 9. What are the requirements in Marine Orders 32 (Cargo) for S.W.R. certification

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Question 10. What are the requirements in Marine Orders 32 (Cargo) for the annealing of shackles and hooks.

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Question 11.What is the mechanical advantage, when rigged to disadvantage, of -

a) A threefold purchase. _________________________________________________

b) A gun tackle. _________________________________________________

c) A luff tackle. _________________________________________________

Question 12. What is an appropriate pulley diameter for 30 mm F.S.W.R.

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Question 13. What is the minimum diameter of S.W.R. required (using a twofold purchase rigged to advantage) to safely lift a load of 20 tonnes.

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Question 14. What is the minimum S.W.L. required for any associated shackle pins in the lift described above.

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Question 15. What standard precaution is used to prevent wire runners from unlaying.

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Question 16. Sketch and label the parts of a steel block overleaf.

View assignment 3