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Old 08 August 2013, 17:07   #21
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I think that discussion might want to wait until you see the method of failure of your existing tank. then you can figure out the best tank for your situation. they all have weaknesses. the bladders are cool but are at least 4X the price. $2500 US for the custom 60 gallon one I looked into.
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Old 08 August 2013, 17:18   #22
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I'm sure it is repairable, but a bit complex... I know I'd have problems if my tank failed with the jockey pods moulded into the deck.

Should be a cracking thread to keep us informed of progress.
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Old 08 August 2013, 17:34   #23
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Hope it will be an easy fix!


Have been using this type of tanks lately,

Ribworld

Never had any issues, but not sure if would use one in a fixed under deck application.

Ali seams to be pretty forgiving, recently was shown a 130 L ali tank that was filled with water and totally frozen last winter, it was swollen and partly out of shape, but still no leaks or cracks!
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Old 09 August 2013, 08:29   #24
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Don't forget GRP...

Hundreds of Osprey's swear by it
I would be interested in hearing what resins they're using for petrol - we have used GRP for diesel with great success but with the new additives GRP petrol tanks are not recommended by our suppliers.
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Old 09 August 2013, 08:38   #25
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Don't forget GRP...

Hundreds of Osprey's swear by it
And don't forget to install good filters to catch all the resin debris that will get sucked up during use

Sorry you'll have to do major surgery at some point Nasher, can you not install another tank in a more convenient position.
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Old 09 August 2013, 09:26   #26
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Buffer, the mesh you mention is invariably in foam blocks now. But I agree about contamination. Water being the main issue here as we're on about o/b's in this case.
The access to RIB tanks for removal of foam blocks through filler is easier than fast fill race tanks I believe, should tank need cleansing.
Obviously, Biffer, my apologies for the typo.
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Old 09 August 2013, 10:01   #27
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Obviously, Biffer, my apologies for the typo.
Been called a lot worse
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Old 12 August 2013, 08:42   #28
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Had a good look over the boat and fuel tank yesterday.

Sorry, didnít think to take any pictures, which would negate much of the description below.

So the good news is that there is no split in the tank itself.

The Stainless Steel tank sits in a void under the glassed in deck, there is a 4 inch inspection hatch between the jockeys to access the fuel gauge sender, and the three tank pipes come up through the deck into the Port side Jockey - Filler Neck, Vent, and Outlet pipe.
These are roughly 2/3 of the way back along the tanks length and slightly off to the Port side. Filler Neck is obviously a much larger pipe than the Vent, and the Outlet is smaller still.
Iím not sure how the tank is Ďfixedí in place in the void, but can ascertain that it is smaller than the void by @ 1 inch all around.
The void has a drain hole into the well in front of the Transom.

The method of bringing the three pipes up through the deck into the Jockey is whatís caused the problem.

A hole has been cut in the deck inside the jockey seat @ 6 x 8 inches which the three pipes protrude up through in a line.
Two pieces of ply have been cut into rectangular spacers with the 6 x 8 hole in the middle, and bonded/flowcoated over the hole, forming a small tower around the pipes Ė God knows why.

A piece of 2mm thick stainless Steel sheet has had three holes drilled in it to fit over the pipes, then itís been screwed down over the hole and mastic or similar used to seal the gap between pipes and stainless sheet. The hull is a 1996 Hull, and Iím assuming it was built like this as Iíve had the boat 10years and itís one of the few things Iíve not ripped out and rebuilt.
The holes in the stainless sheet around the Vent and Outlet have a lot of clearance around them, but the hole around the Filler Neck has only a few mm clearance all around.

Whatever holds the tank in place has obviously compressed or broken over the years, because I can now move the tank @1/2 inch in all directions.

Over the years the tank has moved around and the stainless sheet has worn away at the Filler neck. The rough seas off Dartmouth were probably the last straw and the Filler Neck has sheared off at the worn point. The Vent and Outlet were protected by having more clearance around them.

None of this could be seen from above until I ripped out the stainless sheet and two Ďspacersí yesterday.

Iím assuming the Filler neck sheared off before I poured 60l of fuel in from jerry cans the other day, with the two bits of Filler neck misaligned, some would have missed the tank and gone straight into the void around the tank and then out into the bilge.
Also, with the Filler Neck being 2/3 of the way towards the stern, every time the bow of the boat went up a small amount of fuel would come up the filler neck and liberate itself.

I blocked off the Vent and Outlet Pipe, then Cut a length of old Bicycle inner tube with the valve in the middle.
I put a tight knot in one end, then stretched the other end over the remainder of the Filler Neck and put a Jubilee clip round it.
By doing this I was able to add 3psi of air pressure to the tank, which made the inner tube bulge, and see if it held air.
It took @15mins to go down to zero with a lot of hissing at the Fuel Gauge sender which Iíll sort out soon.

So, I am happy the tank doesnít have a hole in it.

The good news is of course that because of the tower had been built around the pipes the break is a couple of inches above deck level, so with a longer bit of flexible pipe I can still connect to it.

Not completely sure about re-fixing the tank yet, but believe it can be done with expanding foam meaning Iíll just need to drill some small holes to inject it through, which can be inside the jockeys.

Iím going to tidy up the hole in the deck inside the jockey with some flowcoat and leave it as is.
I use the Passenger Jockey as a wet locker anyway, so it will act as a drain down into the bilge.

Anyone have @500mm of fuel hose with an ID of @38mm?

Nasher.
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Old 12 August 2013, 09:02   #29
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Quote:
Originally Posted by Nasher View Post
Had a good look over the boat and fuel tank yesterday.

Sorry, didnít think to take any pictures, which would negate much of the description below.

So the good news is that there is no split in the tank itself.

The Stainless Steel tank sits in a void under the glassed in deck, there is a 4 inch inspection hatch between the jockeys to access the fuel gauge sender, and the three tank pipes come up through the deck into the Port side Jockey - Filler Neck, Vent, and Outlet pipe.
These are roughly 2/3 of the way back along the tanks length and slightly off to the Port side. Filler Neck is obviously a much larger pipe than the Vent, and the Outlet is smaller still.
Iím not sure how the tank is Ďfixedí in place in the void, but can ascertain that it is smaller than the void by @ 1 inch all around.
The void has a drain hole into the well in front of the Transom.

The method of bringing the three pipes up through the deck into the Jockey is whatís caused the problem.

A hole has been cut in the deck inside the jockey seat @ 6 x 8 inches which the three pipes protrude up through in a line.
Two pieces of ply have been cut into rectangular spacers with the 6 x 8 hole in the middle, and bonded/flowcoated over the hole, forming a small tower around the pipes Ė God knows why.

A piece of 2mm thick stainless Steel sheet has had three holes drilled in it to fit over the pipes, then itís been screwed down over the hole and mastic or similar used to seal the gap between pipes and stainless sheet. The hull is a 1996 Hull, and Iím assuming it was built like this as Iíve had the boat 10years and itís one of the few things Iíve not ripped out and rebuilt.
The holes in the stainless sheet around the Vent and Outlet have a lot of clearance around them, but the hole around the Filler Neck has only a few mm clearance all around.

Whatever holds the tank in place has obviously compressed or broken over the years, because I can now move the tank @1/2 inch in all directions.

Over the years the tank has moved around and the stainless sheet has worn away at the Filler neck. The rough seas off Dartmouth were probably the last straw and the Filler Neck has sheared off at the worn point. The Vent and Outlet were protected by having more clearance around them.

None of this could be seen from above until I ripped out the stainless sheet and two Ďspacersí yesterday.

Iím assuming the Filler neck sheared off before I poured 60l of fuel in from jerry cans the other day, with the two bits of Filler neck misaligned, some would have missed the tank and gone straight into the void around the tank and then out into the bilge.
Also, with the Filler Neck being 2/3 of the way towards the stern, every time the bow of the boat went up a small amount of fuel would come up the filler neck and liberate itself.

I blocked off the Vent and Outlet Pipe, then Cut a length of old Bicycle inner tube with the valve in the middle.
I put a tight knot in one end, then stretched the other end over the remainder of the Filler Neck and put a Jubilee clip round it.
By doing this I was able to add 3psi of air pressure to the tank, which made the inner tube bulge, and see if it held air.
It took @15mins to go down to zero with a lot of hissing at the Fuel Gauge sender which Iíll sort out soon.

So, I am happy the tank doesnít have a hole in it.

The good news is of course that because of the tower had been built around the pipes the break is a couple of inches above deck level, so with a longer bit of flexible pipe I can still connect to it.

Not completely sure about re-fixing the tank yet, but believe it can be done with expanding foam meaning Iíll just need to drill some small holes to inject it through, which can be inside the jockeys.

Iím going to tidy up the hole in the deck inside the jockey with some flowcoat and leave it as is.
I use the Passenger Jockey as a wet locker anyway, so it will act as a drain down into the bilge.

Anyone have @500mm of fuel hose with an ID of @38mm?

Nasher.
I'm sure I've got some pm your address where it can be signed for
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Old 12 August 2013, 11:14   #30
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Think I've got some here too.


Not sure about using expanding foam-I reckon you'd need to use very very little or risk damaging the deck.
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