O/H Crane Temporary Derating

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peymanbehnood Participant Join Date: Feb 2011 Posts: 2	O/H Crane Temporary Derating 02/06/2011 10:49 PM
	We have a O/H crane by SWL 12.5 ton that maximum lifting weight at normal operation is 3 ton . I like change the swl to 3 ton as temporary for easy static and dynamic load testing because the area for load test at swl 12.5 ton is not safe . So can we change SWL to original if we need by load testig as 1.25 * 12.5 ton for a while?
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#1 Re: O/H Crane Temporary Derating 02/07/2011 3:35 AM
	Your insurance company are the people to ask __________________ The reports of my death are greatly exaggerated.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: O/H Crane Temporary Derating 02/07/2011 1:08 PM
	The area not being safe for 12.5T does not make the crane itself unsafe for 12.5T. If the crane were unsafe for 12.5T, then there would be a report in the General Register from the Engineer/Surveyor from the insurance company providing crane failure indemnity insurance cover that would state the maximum load to be applied to the crane. The safe working load will be determined at the periodic inspections. Why is the originally-posted course of action being considered at all? Why not just cover it with a temporary Procedure until the area is safe for 12.5T again? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Anonymous Poster	#3 Re: O/H Crane Temporary Derating 02/08/2011 11:43 AM
	I do not understand why you changed the swl from 12.5 ton to 3 ton, and what makes it unsafe. The swl is determined by a ratio 2:1, 3:1 etc. and that is determined by the weakest link in your operation. If the swl is 12.5 ton under normal conditions, you need to see what the swl of all aspects of the operation i.e. the connection supporting the crane. If it is connected to an object that has a swl of 1 ton then the swl is 1 ton minus the weight of the crane.
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peymanbehnood Participant Join Date: Feb 2011 Posts: 2	#4 In reply to #3 Re: O/H Crane Temporary Derating 02/09/2011 6:30 AM
	thank for reply I means that the max tonnage rating crane changed to 3 ton for reduce weight of periodic load test (load test ratio of swl is 1.1 and 1.25 swl). the volume of 13.75 or 15.6 ton sinker(cargo load ) is very big and the area for testing in not enough .so by reducing the swl we can reduce weight of sinker .
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SenUmaSrii Member Join Date: Jul 2007 Posts: 7	#5 In reply to #4 Re: O/H Crane Temporary Derating 02/09/2011 8:54 AM
	For 3 t load handling you can add an aux hoist, and get the crane certified for the same. In case you handle 12 t load again your crane has to be certified.
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Anonymous Poster (1); peymanbehnood (1); PWSlack (1); SenUmaSrii (1); TonyS (1)

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