Lifting 350kilos

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Boat148493

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I have a Fastworker 19 workboat and have access to a contract to drop and recover moorings with weights up to 350kilos. Need a way of getting them on and off boat safely.
These are my 2 options at the moment


2000LB Swivel Truck Crane (900kg)

This will do up to 900kilos but am worried about lifting from alongside boat as is more unstable


https://img.nauticexpo.com/images_ne/photo-m2/63904-11356801.jpg

Other option is an A frame style like this but probably without hydrolics

Any more options let me know
Both will need some changing and engineering which I’m willing to do
 
What about a temporary outrigger -couple of sealed barrells attached to supports fixed to your to gunwales - will turn your boat into a catamaran and should get over the instability problem
 
These moorings are chain for surveys on windfarms topping off at 350kg. Not sure what the bottoms like but the outriggers a good idea!
 
Simon 420 said:
What about a temporary outrigger -couple of sealed barrells attached to supports fixed to your to gunwales - will turn your boat into a catamaran and should get over the instability problem
Click to expand...
Rberrow1 said:
These moorings are chain for surveys on windfarms topping off at 350kg. Not sure what the bottoms like but the outriggers a good idea!
Click to expand...

If I were awarding the contract and your RAAMS stated that you'd be strapping a couple of barrels to the side of your boat to assist stability, you would not be awarded the contract.

Secondly if you never specified that in your RAAMS and turned up with barrels lashed to your boat, you would be stopped immediately and stripped of the contract. The HSE would have the CDM guy charged in no time for allowing that to proceed.

Sorry, but I don't think you could safely operate on a commercial basis with the boat you have. Laying your own mooring, perhaps you could make it work with luck. But commercially? No chance. Sorry
 
Probably not much help but an IP 23 used to do our moorings - approx 150kg . That was by bringing the block to the bottom of the slipyway by truck at low tide, waiting for the tide to rise over the block then attaching it to the boat. Tide rises further and off it went at about 0.5 knots to wherever the block was required, no more than 500 yards from that slipway. I'd be astonished if a Fastworker 19 is able to deal with up to 350kg...
 
No way to lift 350kg on the beam in such a small/light boat; a multicat with spudlegs would be absurdly overspec but what is proposed is not feasible safely. It might be feasible to do it from a fixed fairlead at the bow or stern as jointventurell outlines but even then stability will be marginal.
 
jointventureII said:
Probably not much help but an IP 23 used to do our moorings - approx 150kg . That was by bringing the block to the bottom of the slipyway by truck at low tide, waiting for the tide to rise over the block then attaching it to the boat. Tide rises further and off it went at about 0.5 knots to wherever the block was required, no more than 500 yards from that slipway. I'd be astonished if a Fastworker 19 is able to deal with up to 350kg...
Click to expand...
We used to drop 100/150 kilo blocks in Greece, non tidal of course, we would nose the boat up to the quayside, then lower the block down below the water, then tie a rope halfway up the chain to the bow, then reverse out dragging the chain and buoy out from the quayside, then simply cut the rope and the block would drop, it seemed a safe way to do it, 350 kilo is a lot too much weight in my opinion for a 19ft boat, could be a bit iffy!
 
Ye might be right! Too big a weight. I’m going to look at my options and give them a go anyway, will build up the weight and see what she’s safe doing. Lifting from the stern corner and swinging inboard from there might be better.
A way of lifting 150kilos is still better than none atall.
 
350 kg far too much for a 19ft Fastworker - ,nearly half a ton in old money !
A proper comerciially run and registered spud barge with correct safety features is the answer.
 
Rberrow1 said:
Ye might be right! Too big a weight. I’m going to look at my options and give them a go anyway, will build up the weight and see what she’s safe doing. Lifting from the stern corner and swinging inboard from there might be better.
A way of lifting 150kilos is still better than none atall.
Click to expand...

Swinging weights around like that you will capsize and drown yourself. Have you done anything like this before?
 
Rberrow1 said:
I have a Fastworker 19 workboat and have access to a contract to drop and recover moorings with weights up to 350kilos. Need a way of getting them on and off boat safely.
These are my 2 options at the moment


2000LB Swivel Truck Crane (900kg)

This will do up to 900kilos but am worried about lifting from alongside boat as is more unstable


https://img.nauticexpo.com/images_ne/photo-m2/63904-11356801.jpg

Other option is an A frame style like this but probably without hydrolics

Any more options let me know
Both will need some changing and engineering which I’m willing to do
Click to expand...
I work in the the marine crane industry , on the electrical side and I constantly here the guys talking about the wave factor, I believe it’s when the boat rocks and the crane snatches and multiplies the amount of load on the winch .
 
penberth3 said:
Swinging weights around like that you will capsize and drown yourself. Have you done anything like this before?
Click to expand...

Drowning himself will be the least of his worries - when he drowns his employee on the boat operating either the crane or the boat (one man can't do both jobs) he'll be done for corporate manslaughter.
 
Christ?thanks for all the constructive feedback there’s no shortage of opinions.
I’ll send in what’s worked for me when I have it built In a couple of months
 
What you need to understand that every piece of lifting equipment , that has been designed and buit , has to have been certified by someone who can issue a loller certificate , with a safe working load proven , then has to be tested every 6 months . if iam correct.
 
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