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Old 07 May 2013, 13:40   #11
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Boat name: Carpe Diem
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Update

Now built the console ready for the fuel tank, please see pictures and explanations

1.) Photo #1 showing deck fill and vent point outside console

2.) Photo #2 showing inside top half of console and the back of fill and vent point. The boxed section has been sifaflex in but will also get fibre glassed on every joint and there is obviously another section of wood to add. This will therefore mean fuel pipes and vents will be sealed off

3.) Photo #3 showing inside fuel tank area. The wood shelf / divider has been glassed in and the two 32mm copex tubes have a tightened conduit and sifaflex as well. There is 4cms around the width, height and length to allow for expansion but don't forget there is a vent so not sure if tank will expand.

4.) Photo #4 showing conduit into battery compartment which is separate housed area to fuel tank as it came out of the fibreglass mould.

5.) Photo #5 shows self sealed fuel tank

Next jobs

1.) Main engine/steering trunk will come up through the fuel tank area. I will be using a CV boot type seal on the floor joint and upper shelf/divider I have glassed in

2.) Fit tank and pipes and finish off box section

3.) Fit electrics to upper compartment

As safety is at the front of our minds is there anything additional I could do, what do the manufacturers do?

I was thinking about putting two additional vents in the lower compartment / fuel tank zone in case there was a leak it would vent to atmosphere - not sure if worth doing?

Thanks

Gareth
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Old 07 May 2013, 13:57   #12
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Looking good!

You'll need to put at least one vent in the compartment with the tank in, or air expansion will cause you a problem. Put it very low down where it can self drain of water as well, or you'll have water buildup problems and (if it leaks fuel) petrol fumes sitting in there. .

Is it just the main battery cables going through those conduits?
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Old 07 May 2013, 16:47   #13
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Thanks, I assume the vents (stainless) are effectively 1 way valves and will stop water getting in.

Yes the 32mm conduit is only for the battery cables.

Thanks again for your help and advice

Gareth
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Old 07 May 2013, 17:35   #14
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Quote:
Originally Posted by whackywoody View Post
Thanks, I assume the vents (stainless) are effectively 1 way valves and will stop water getting in.
No. They need to be able to flow air both ways.

Put them somewhere water either won't get in, or where water will all flow out.Personally I'd put a drain into the bilge in there as well.

Basically, petrol fumes are heavier than air, and any enclosed/sealed space needs a vent or atmospheric pressure and temperature changes will cause you a problem. Hence needing vents at floor level.
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Old 07 May 2013, 17:51   #15
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Quote:
Originally Posted by Nos4r2 View Post
No. They need to be able to flow air both ways.

Put them somewhere water either won't get in, or where water will all flow out.Personally I'd put a drain into the bilge in there as well.

Basically, petrol fumes are heavier than air, and any enclosed/sealed space needs a vent or atmospheric pressure and temperature changes will cause you a problem. Hence needing vents at floor level.
Sorry for being a bit thick but are we suggesting a hole (as air will flow both ways)

I have no bilge pump but do have a bilge drain at the rear of the boat do you mean therefore a hole in the deck to (in console) to allow water and fumes to drain away?

Thanks
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Old 07 May 2013, 17:58   #16
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Yes.
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