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Position Mooring on a floating storage and offloading?

asked Dec 15, 2014 in Operations by lampanda (2,450 points)
Regarding the use of an inclinometer method for mooring tension measurement for the steel wire rope arrangement, can the inclinometer be used for the polyester rope arrangement?

2 Answers

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answered Dec 15, 2014 by pasmith (3,320 points)
You should be aware of the following DNV guidance note (DNV-OS-E301, Section 14.1.5):

“Note that the use of angle measurement instead of tension measurement poses a problem for polyester mooring where the line lengths will change with loading condition.”

The inclinometer can be used for the polyester rope arrangement when coupled with digital GPS system: a unique solution for mooring line tension and for polyester stiffness can be obtained with the knowledge of the mooring line angle and the fairlead distance to the anchor.

This approach was approved by DNV who acknowledged the better accuracy and robustness of the inclinometer.
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answered Dec 15, 2014 by Normandy (21,000 points)
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