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Marine Crane Foundaion

Marine Crane Foundaion

Marine Crane Foundaion

Our group procureed a small knuckleboom marine crane for installation on a work boat.  Load moment is 10 ton-meter, wt 1659 Kg, skewing torgue 24 Nm.  The vessel is in the US. What procedures are used for designing the crane foundation on the boat? What codes are used and what verification are required?  Do anyone have a design example or online links they can provide?

RE: Marine Crane Foundaion

Get hold of the US Coast Guard for that question.

RE: Marine Crane Foundaion

One question, is the marine crane a mobile type,ie,on wheels or treads?

RE: Marine Crane Foundaion

It's mobile, because it gets bolted to a boat.

Mike Halloran
Pembroke Pines, FL, USA

RE: Marine Crane Foundaion

For whatever reason, yesterday, I could not open your JPEG file but today it opened up and looking at your crane it is not  mobile unless it hase wheels or tracks.  Looking at the bed frame of the crane in your picture, a though occured to me that you may want to bolt the crane base on a different bed frame for a 360d of rotation.  This bed frame would spread the load on the deck, assumingly, of a barge that is designed to handle a listing and tilting not exceeding OSHA's regulation on cranes mounted on barges.
For a starting point check out ASME.ANSI B30.8 Floating Cranes and Derricks.  There is a general statement about the structural support of barges.
In my past employment in bridge construction, we used a lot of barge mounted cranes, but our cranes were either on wheels or tracts and we used mats or dunnage on which we positioned our cranes.  Whenever we bought a second barge, we always got background info on the barge from the seller and occasionaly reinforced their internal steel bracing, so the seller may also be able to assist you.
Note, you'll need a revised load chart, on board, for the crane to be used over water.  

RE: Marine Crane Foundaion

Use the Lloyd's Register Rules for Lifting Appliances in a Marine Environment which contains stress criteria for crane seatings :
a) assuming that your cranemoment includes all duty and hoisting factors apply 50% of the yield stress of the pedestal as  criterium
b) ensure that the pedestal penetrates  the deck and stop it either at the bottom or at the next deck under the maindeck .You may need to fir a shear plate to absorb the vertical loads.
c)if you want to stop the pedestal at the deck ensure to fit sufficient substantial girders and transverse underneath the deck to absorb the crane loadings.

Ship surveyor to LR

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