You are on a supply run to an offshore drilling rig. You are carrying the load show in table ST-0018 below. What is the height above the main deck of the center of gravity of the cargo?
• Combined center of gravity using weight × distance (moments) and dividing total moment by total weight • Converting inches to feet and long tons to pounds before doing moment calculations • Finding the vertical center of each item/tier above the main deck (drums, boxes, generator, pipe tiers)
• Where is the center of gravity of a drum that is 30 inches tall and standing on end on the deck? How high is that in feet? • If 26 boxes are stowed two high, how many boxes are in the lower tier and how many in the upper tier, and what is the CG height of each tier? • For the casing pipe, how do the different numbers of pipes in each tier (10, 9, 10) and their given CG heights affect the total moment?
• Convert all distances to feet and all weights to pounds before calculating moments (1 long ton = 2240 lb; 30 inches = 2.5 ft, etc.). • Compute and write down the total weight of each group (drums, boxes, generator, each pipe tier) and its moment = weight × CG height. • After summing all moments and all weights, check that your final CG height is between the lowest and highest individual CGs you used.
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