2. Consider the following scenario using the heavy lifting charts in the specifi
ID: 2074876 • Letter: 2
Question
2. Consider the following scenario using the heavy lifting charts in the specifications for a Manitowoc 12000 Crawler Lift Crane to be downloaded separately from the class website. A 20-ton reactor vessel needs to be lifted by the 12000 Manitowoc on your project. Assume the rigging weighs 800 lbs. What is the maximum distance the cranes can be from the vessel in order to safely make the lift considering the crane is currently fitted with a 230 foot main boom per the heavy-lift load charts? What is minimum number of parts of line that need to be used? Cite the tables from the specifications used to formulate your answer.Explanation / Answer
Distance of crane from the vesesl
Total lift weight W= reactor vessel weight+rigging weight=20x2000+800=40800 lb
From the range diagrams of fixed jib and luffing jib attachments wiyh main boom, with 230ft main boom fixed and luffing jibs can not be used.
Referring to heavy lift load chart for boom length=230 ft with load radius=40 ft, the allowable load is 42700lb>W
At radius = 45 ft the allowble load is 40100 lb<W
Hence the Maximum safe radius of lift= 40ft
Therefore the load should be placed at a maximum distace of 40 ft from the crane.
No of parts of line
Referring to the table for maximum load for main boom, the maximum load capacity with 2 nos reeving parts of line for hoist rope is 50000 lb.>W
Hence safe number of parts of line is 2.
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