Raising 65 ton ferry ramp!

[IanDennis]

Tsavliris might be an option for advice aswell - probably a little small for them though

[Dave Crampton]

Here is what he says based on your original post:


I assume the ramp is on the sea bottom?
Had it been cutoff, there are normally hinges, these if intact are the best lift points.
Other than that cut holes through so it can be rigged with wire ropes around the longtidudinals.
You will need a floating crane to lift it out of the water?

If it is for scrap value, I wouldn’t bother, if the ship needs the ramp back then the insurance would weigh the salvage cost against making a new one.

ATB Dave

[Midnight]

Cheaper to make a new one I'd say?

Oh, and tell them not to mislay this one!!

[A. Berk]

Feck-me, I've done 3 edits now 'cos I've got blokes standing behind me talking about the weight of something completely different and I'm mixing the two subjects - I'm losing the plot! Anyhow.....

Don't think of putting liftbags on the door for anything other than taking the 'sting' out of the load. Even if you could get enough buoyancy (65 tons equals a lot of BIG bags!) on it to break suction once it did break loose you'd have a large, hard, sharp-edged monster going ballistic to the surface - before losing its 'bubble' and coming back down on anyone unlucky enough to be in the water! The only safe option with bags is 60 metre long rigging so your bags are at 10m and you can 'pop' the sucker off bottom. However, you'll need the same amount of bags again to re-rig at 10m and do the same again and repeat until its close to surface. This takes a lot of time, bags and air and from such depth can easily turn to custard if you have any tide or strong winds and you'll still need a crane to recover it from the water!.

As mentioned in an earlier post your best bet is to cut access holes to the strong points ( 'I' beam material etc) and personnally I'd run heavy chain through as wire-ropes can crimp and damage when taking a sharp turn on steel. The winches on the door aren't man enough to rig to as they were designed to raise and lower at an angle that lessons the dead-weight of the door. The hinges... they are just hinges not lifting points and you won't get any reasonable sized chain/wire through them. Plan on lifting an extra 10% - 20% ( 6.5 - 13.0 tons) as suction and 'spillage' will come into play until the beast actually gets moving.

So, you need burning gear, 70+ tons of cranage, some lift bags to help take some weight and some divers who know what they are doing. The vessel I am on right now has all that and we'd be looking at about 6 hours work there.

Good luck with it Rod, you'll need some... that option of leaving it for the fishes looks good from here.

Berko

[Sandman]

Unless it is worth a lot of money or is irreplaceable I wouldn't bother even trying to lift it. The cost and depth involved would make it uneconomical.

As Mr Berk says the only real option is a very large floating crane. The depth puts you into SAT diving depths or maybe surface gas diving if you fancy your chances at that.

I did some salvage work last year in depths down to 45 metres lifting 2 trawlers and for that we needed a 400 ton crane barge which cost €40,000 a day and a 12 man dive team. The cost of the whole job was €1,000,000.





A new door would be your best option.

Cheers

Simon

[Dave Crampton]

Alright Simon,

Are you still on the box? Is that you into Comie diving now??

Dave C

[Sandman]

Originally Posted by Dave Crampton

Alright Simon,

Are you still on the box? Is that you into Comie diving now??

Dave C

Still in posession of the yellow (Kent Tooling) box but its become a bit of an ornament lately. I'll keep it to show you around the Glanmire off St Abbs and then I'll retire from sport diving and sell it. BB has already made me a generous offer for it, well she will when she starts paying for her trimix fiils

Been comical diving a while now and just don't have the time for recreational stuff as much as I'd like too. Still plenty of dives I'd like to do though.

Cheers

Simon

[mikehoward]

Sandman

Bit off topic but are those two trawlers on the harbour wall in Arklow now? I Was there last weekend and saw two that look just like these.

Mike

[Rod Abbotson]

Thanks a lot everyone, I can now basically tell the parties involved that the whole thing is basically uneconomical to recover - I already told them this, but needed some more ammo, so they dont keep coming up with silly ideas that'll put me in an unacceptable risk situation! There is a lot more work to be getting on with in the port than this!

cheers
Rod

[Sandman]

Originally Posted by mikehoward

Sandman

Bit off topic but are those two trawlers on the harbour wall in Arklow now? I Was there last weekend and saw two that look just like these.

Mike

Mike,

Yeah they were taken to Arklow last November and were supposed to be cut up but its still ongoing as far as I know. Too complicated to explain on a public forum. Just do a search for the Pere Charles or the Maggie B.

Cheers

Simon