Well, here is the answer folks. Given my Stomper medal award a lot of thought and on reflection have decided that BP was virtually there re the answer as he suggested using the ships winches which of course you could do all sorts of things with, cutting holes to run cables to or from, snatch blocks and eyes to attach cables to, in fact all sorts of cable runs combinations could be attained to solve the situation. Don't forget what you were told when you started out, you can never, ever have enough tools. Even if it's once a year job it could well save your life. This piece of kit is an extension of just that, please remember I did say the most unusual job you ever did, and that a very large toolbox was necessary , seeing the discussions and answers supplied by some of you folk out there and knowing I was really up against it I did perhaps pitch the question a little high. This bit of kit is American made by Earnest Holmes of Chattanooga, Tennessee and purpose built on a suitable rear suspension UK truck. For this operation the twin booms are split, as per photo to obtain the maximum winching effort from the mastheads.Two 25 ton winches which thro' snatchblocks can be grossed up to 100 tons each side ( by using 4 snatchblocks ie 4 times 25 ) to obtain a 4 to 1 pull. The frictional losses on each well greased snatchblocks is 7/8 percent ( I cheated on that, I couldn't remember so I looked it up) So onto the job, good inspection based on the old shipwrights adage, measure twice, cut once basis. Check you can secure self locking chains high up on the ships side to take two snatchblocks, luckily beam girders are already cut to access this to save the oxy/acet cutter jobby. Position the blocks high up opposite the trailer up on the girder, place chains and wide strops on the trailer only ( never the tractor unit to avert fifth wheel coupling twisting damage ) Winches into neutral, pull out the two wire ropes (250.00 feet on each drum) climb up the ships side, undo the snatch blocks, in with the winch rope and lock them up. Down to the trailer strops and into the hooks. Now this lot weighs 44 tons but we are not going to do a deadlift here but a rolling weight calculation. Past experience dictates a one to one pull will suffice easily, ie a straight pull via one snatchblocks only. Place the scotch blocks ( see under the rear road wheels ) and loop the self locking chains loosely into the locking plates purposely built into the rear of the vehicle.( see photo ) make sure all is clear and release the air operated handbrake on the truck. Start winching and the truck will climb up ont the scotch blocks and when the chain tightens the whole of the truck is locked up solid. On with the air handbrake, all of this lockup will prevent the recovery vehicle being winched towards the casualty which of course you do not want. It's such a lockup that you can get the ballasted by 12 tons front wheels off the ground by winching rather than the vehicle moving back. So on with the pull, winch at tickover and as its only a rolling weight up she comes. When it's against the truck tyres you put on the ships side let go everything, reattach the kit on the other side of the ship and lowdown on the trailer and then the tractor unit to winch it over to release it from the ships side and get your tyres back. Put away all the kit, lift and tow the whole lot off the ship onto the quay. Check that air cleaner as I said before in case it's an oil bath type to avert the S shaped Conrad scenario on startup. So there you have it, a necessary diversion to the everyday job and very different indeed and a good way of keeping you out of the pub on a Saturday night. Apologies to BP here as obviously he knew all along that I do not keep this piece of kit in my toolbox after all but was talking figuratively in order to throw him off the scent, but he knew the answer was winching but he did not know of course to what the winches were attached. So Martin can justifiably award him the Stompers medal in this case with my full blessings. That's me on the left with the gloves on by the way. Ps, the unbroken wine cases we had to test after the job were passed out as ok by me and my assistant, perhaps the most important aspect of the whole job.
Last edited by JK
on Tue May 12, 2015 1:29 pm, edited 1 time in total.
Reason: Edited to fix photo, JK
Remembering The Good Old days, when Chiefs stood watches and all Torque settings were F.T.