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Old 19-01-2014, 16:17   #31
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Re: Polysulfide to seal diesel tanks

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You think 5200 gets all over everything? You haven't played with B2 yet
That is putting it lightly. It is the worst smelling, sticky messy stuff you will ever use. On the flip side, its worth it. Having sealed hundreds of aircraft seams with the stuff, you can use a little mineral spirits on your finger to smooth out the seam, but you will be wearing that stain for weeks
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Old 19-01-2014, 16:18   #32
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Re: Polysulfide to seal diesel tanks

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Try this sketch. This is the compartment in the keel. The keel sheets are continuous. The dividers are just vertical plates, think baffles. The sole is 1/2".

The top is about 15" long and 10" wide. It is about 48" deep.
So the area is 15" X 10" X 48" ? That will hold a total of about 30 gals.
What are you doing for fill hookup, vent, return and pickup?

For that little amount of fuel, I would just get a rotocast tank and find a place to mount it and be done with it.

A whole lot easier and cheaper.

I thought we were talking about a big tank.
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Old 19-01-2014, 16:19   #33
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Re: Polysulfide to seal diesel tanks

With B2 a little soapy water on a finger tip will smooth it, it can be cleaned up if it's wet with Acetone, even thinned with acetone, but you shouldn't. When dry, nothing touches it, has to wear off.
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Old 19-01-2014, 17:31   #34
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Re: Polysulfide to seal diesel tanks

Capt,

I think your thinking a MUCH bigger boat. I'm just 33 FEET.

Also, I'm trying to accomplish two things.
A....fuel storage
B....corrosion protection

Thanks for your help.
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Old 19-01-2014, 17:35   #35
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Re: Polysulfide to seal diesel tanks

Ok,

Got it...Nix Boatlife

Do you have a recommendation for what to use, brand name? And supplier?

And thanks for all the help. I started with an aircraft product but got intimidated in making the right selection.
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Old 19-01-2014, 17:56   #36
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Re: Polysulfide to seal diesel tanks

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Nope, I'm an A&P/IA and currently manufacture one aircraft a week at Thrush aircraft Inc., most aircraft are wet wings, sealed with either B2 or Pro-Seal, both brand names. a typical aircraft wet wing section has hundreds of rivets to seal to say nothing of the wing always flexes, the inspection requirement for wet wings is fix them if they leak, a wet wing should have no problems leaking for at least 20 years and or 10,000 hour, minimum.
The fuel tank sealer he intends to use is a permanent solution that will last Lord knows how long, I don't.

As far as tank testing, your talking Hydrostatic testing, which is high pressure, that is not how to test a fuel tank, to test a fuel tank you use air measured in inches of water, like maybe a couple of feet max, only a couple of psi, max. Using air as a testing medium makes a spray bottle filled with soapy water an excellent leak finder.
Testing procedure is to use a manometer, a home one is just fine, pressurize the tank, turn the air off and wait to see if there is a drop in pressure. It's entirely normal if the test begins in the morning for the pressure to rise slowly as ambient air temp rises.

Some aircraft like my C-140 and my Maule have separate metal tanks just like say an automobile, Most smaller aircraft do not have bladders, Military aircraft due as they are easier to make self sealing
Glad you posted this. It sounds like a good cross over into the boating industry. I'll keep it in mind if the occasion arises.
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Old 19-01-2014, 18:42   #37
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Fuel pump suction

Check with the maker of your engine and see if the lift pump can pull fuel in a tank that is 48" deep.
There may be an issue and you might need to add an electric fuel pump to take the load off the lift pump on the engine.

Just check to make sure. Most lift pumps are only good for 3' of lift and you have 4'.

It is worth checking into.
Good luck with it and let us know how it comes out.

OK aircraft guys, will this product stick to composites ?
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Old 19-01-2014, 19:02   #38
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Re: Fuel pump suction

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OK aircraft guys, will this product stick to composites ?
It sticks to everything, almost. If you want a parting surface use a wax like a mold release wax or a paste wax on a cover plate. It does not seem to leak and it lets you get the plate off someday.. Otherwise the only reward from working with this stuff is how little can you get on your hands when using it.. I've used lots of this stuff an very seldom do you come away clean, if ever. Oh, you get used to the smell.
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Old 20-01-2014, 06:02   #39
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Re: Polysulfide to seal diesel tanks

Capt,

I intend to run to a day tank first. I'll probably use a whale fuel transfer pump, as I'm trying to standardize on them for my needs and I use one on the big boat for the same purpose. That will let me filter fuel into and out of the day tank. Maybe keep a manual backup.
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Old 20-01-2014, 06:16   #40
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Re: Polysulfide to seal diesel tanks

Diesel fuel tanks should be tested to a minimum pressure of 3 psi (21 kPa).

ABYC H-33 ➥ http://newboatbuilders.com/docs/H-33_Diesel_2005.pdf
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