Question:
What are the advantages of a hallen derrick?
Author: Sophie March
Answer:
-it is simple compared to a single swing derrick; -1 man operation for slewing topping and hoisting -it can operate with a 15 ° list -it can operate down to 15 ° above the horizontal -slewing angles as much as 80 ° -deck clear of clutter -up to 200T capacity
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Author
Sophie March