Anti fouling ships and ferries.

[gravygraham]

How do they do it? It's true commercial vessels get much more use that most of our money-pits tied up in the marina, which probably slows the growth down a bit. So what do they use then? Divers? Dolphins? Dynamite? Anyone in the know?

Graham

 

[jhr]

Not sure how widely this applies to commercial craft, but I believe many are still allowed to use TBT antifouling because they're never in the same place long enough for it to leach into the water?

This may be absolute Bollox, but Snopes doesn't seem to cover antifoul or ColReg myths, so I can't check. /forums/images/graemlins/grin.gif

 

[ccscott49]

TBT is banned for commercial craft as well as liesure.

They dry dock the ships and paint them!

But they can and do, get divers to scrub the bums, but a ship moving through the water all the time, does not get as fouled as a boat in the marina.

I use BIG ship antifouling and put heaps on!

 

[gravygraham]

TBT - what's that then, DDT's cousin?

As for dry-docking them and unwrapping the paint brushes, it can't be undertaken very often surely.

Graham

 

[jhr]

[ QUOTE ]
TBT - what's that then,

[/ QUOTE ] Triboty.... trybito.. tribumb...

It's tin stuff that they used to put in antifouling. Stopped most things attaching themselves to your boat but killed marine life (which, after all, is what it was meant to do) and gave whelks an extra willy. Or something.

Tributyltin. Got it! /forums/images/graemlins/grin.gif

 

[sailorman]

http://en.wikipedia.org/wiki/Tributyltin

 

[wp1234]

[ QUOTE ]
How do they do it?


[/ QUOTE ]


Intersleek’s the stuff a lot of shipping companies use .Its ultra smooth, slippery has a low friction and non-stick surface. Ferries especially fast craft rely on this stuff to ensure good fuel efficiency, speed and reduced maintenance costs.
Needs special attention when putting on and usually has a paint technician watching it go on – big bucks !!!!!


web page

 

[pampas]

British ships was (When I was deep sea, may have changed by now) every 2 years with a six month exstension. If you wish to see it being done,Falmouth Docks is a good place to view the process. /forums/images/graemlins/grin.gif Many VLCC`s have a bottom scrub either by divers or machine, very effective, can put 1/2 knot or more on the speed. Most of the P&O cross channel ferries come to Falmouth for their winter refit,both hull amd engines.

 

[mjf]

You can go 5 yrs with a intermediate in water survey. Ship under 20 yrs.

Thus running concurrent with Class Special Survey cycle

 

[pampas]

WOw! how things have changed, thanks for the info.