Fuel tank and battery in same compartment? - SailNet Community
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post #1 of 16 Old 04-12-2011 Thread Starter
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Fuel tank and battery in same compartment?

My catamaran has transom-hung outboards. I'm thinking about the best location for the starting batteries and permanently installed below deck fuel tanks. We currently use portable tanks above deck. They are always tripping people, fouling sheets, or otherwise in the way. Each hull has a compartment at the stern with a bulkhead sealing it off from the rest of the boat. These compartments would be the perfect size and location for battery and tank. Assuming the battery is installed correctly (strapped down in leakproof box; vented; no ignition sources, etc) and assuming a permanent below deck tank is installed correctly (strapped down; properly installed deck fill and vent, etc), would it be illegal/unsafe/unwise to have battery and gasoline tank side-by-side in the same compartment?
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post #2 of 16 Old 04-12-2011
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would it be illegal/unsafe/unwise to have battery and gasoline tank side-by-side in the same compartment?
Yes.
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post #3 of 16 Old 04-12-2011
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Well

Not sure if you really mean touching or in the same compartment


Unwise as it may be its sort of the way a lot of boats were and still are built

There are a fair amount of ventilation requirements that may come into play and i had a survey guy stop by my boat before i got to far into it to get and idea what would pass

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If a dirty bottom slows you down what do you think it does to your boat
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post #4 of 16 Old 04-12-2011
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Fires and explosions require three conditions before they can occur. This is called the fire triangle. It is, oxygen, a source of ignition, and fuel. On boats the oxygen obviously is present, the source of ignition is usually the boats electrical system, and the fuel is generally gasoline. So, if one side of the fire triangle can be eliminated, then the explosion and fire can be prevented. Each of the standards dealing with fuel systems, electrical systems and ventilation is designed to eliminate one of the sides of the fire triangle.
Kind of simple. But, it makes sense. Would it be possible to build a glassed-in box that is ventilated to the outside for the gas tank?
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post #5 of 16 Old 04-12-2011
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If you install a proper fuel tank its already a sealed unit



And then install the proper fill and vent hoses



And locate the fill and vent so they do there thing overboard WHICH has a bunch or rules as to were


If you have smells something is broken

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post #6 of 16 Old 04-12-2011 Thread Starter
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Well, I've read all the AYBC/USCG/ISO regs I can find regarding battery installation and permanent fuel tank installation. AYBC says the battery can't be directly over or under the fuel tank, and there are specific rules about fuel hoses running over batteries. Otherwise I can't find anything specifically about battery/fuel tank proximity. The only issue I know of is that all electrical devices in the compartment have to have ignition protection certification. I guess batteries don't have that certification, even if under normal conditions they are not an ignition source. So the batteries will have to move to another home.
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post #7 of 16 Old 04-13-2011
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Battery s are allowed but as i said before i would consult with a good survey person before making such a big change as you have no motor down there the ventilation requirements are the issue that's up in the air

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post #8 of 16 Old 04-13-2011
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I can't count the times that I've had a little arc when removing or replacing a 12v battery. Can't imagine wanting that to happen in the proximity of a gasoline tank, vented or otherwise. Yikes.

Can you put the batteries in one hull and the tanks in the other and just run wires and plumbing across?


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post #9 of 16 Old 04-13-2011
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How big are these compartments? are they just lockers or are they someplace you could install inboards if desired?
My batteries are about 3ft from the fuel tank, diesel now was gas, in the engine bay, all that seperates them is a peg board and 3ft.
can you split the compartment in some way to devide it as a removeable bulkhead?
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post #10 of 16 Old 04-13-2011
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Another reason...

Robert,

With the safety precautions already noted above by others, here's another reason your idea may not be so good. I'm not certain how large your catamaran is but fore-aft hull trim is key to catamaran performance, and so you may not want to concentrate too much weight in aft. compartments. Both fuel and batteries are heavy and might cause your transoms to drag.
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