LIFTING WIRE

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SWIFT Participant Join Date: Jul 2008 Posts: 1	LIFTING WIRE 07/31/2008 6:39 AM
	I AM PRESENTLY HAVING A LIFTING FRAME MANUFACTURED TO LIFT BOATS. THE FRAME IS 5mts LONG x 3.5mts WIDE,IT WILL HE HELD BY 4 SLINGS ONE TO EACH CORNER, THE HEAVEST BOAT TO BE LIFTED WILL BE 9 TONS. THE LENGTH FROM THE FRAME TO THE CRANE HOOK WILL BE 4 mts. WE WILL BE WORKING TO A SWL OF 15 / 16 TONS. MY QUESTION IS CAN I HAVE 4 WIRE SLINGS MADE WITH A WIRE THAT WILL TAKE 5 TONS EACH. WOULD IT BE CORRECT TO SAY THAT THIS CONFIGURATION IS CAPABLE OF LIFTING MY 9 TONS SAFELY.IF NOT WHAT TYPE OF WIRE SHOULD I BE LOOKING FOR. THANK YOU, ANY ADVICE IS APPRECIATED. SWIFT.
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	Pathfinder Tags: LIFTING EQUIPMENT

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Mr. Truman Brain Guru Join Date: Mar 2007 Location: South-east corner of Spain 50 48 49.24N 2 28 27.70W Posts: 1508 Good Answers: 31	#1 Re: LIFTING WIRE 07/31/2008 8:42 AM
	Welcome to CR4, Some of the older folks here find posts in UPPERCASE very difficult to read! Also in some cases it is considered as shouting! It's all about netiquette my friend! I hope you find the answers to your questions here and am looking forward to seeing you around the site! Thanks for registering, it makes life so much easier for all! __________________ “It's kind of fun to do the impossible.” Walt Disney
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ba/ael Guru Join Date: Nov 2007 Location: Sherwood Park, Alberta, Canada Posts: 1212 Good Answers: 74	#2 Re: LIFTING WIRE 07/31/2008 11:05 AM
	If you attach each lifting wire to one corner of the frame and if the center of gravity of the boat is dead center on the frame, then each wire sling will take a vertical load of 2.25 tons. The height is 4m and the horizontal distance is about 3m, so the length of sling is about 5m. The tension in each wire would be 2.25 * 5/4 = 2.81 tons. If the centroid of load is not dead center, the above result will not be correct. The error will depend on how far the centroid is from the center of frame. The lifting wire will not be a single wire, but a wire rope or steel cable. There are many types of wire rope and you should probably consult with your supplier to find out which is the best for your purpose. You will also need proper fittings and connections. Proper lubrication of wire rope is important also. OSHA will have requirements about inspecting the cables periodically. Hope this helps. __________________ Bruce
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Anonymous Poster	#3 Re: LIFTING WIRE 07/31/2008 11:24 AM
	Bruce said it well. Listen to what he has said. Call your provider (a sling shop) and they will point you in the right direction.
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Anonymous Poster (1); ba/ael (1); Mr. Truman Brain (1)

You might be interested in: Lifting and Rigging Attachments, Lifting Jacks

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