Re: Inert Gas In Fuel Tanks

From:         FM <>
Organization: Rogers Cablesystems Ltd.
Date:         07 Sep 96 17:09:04 
References:   1 2 3 4
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Jean-Francois Mezei wrote:
> Out of curiosity, how is pressure controlled inside fuel tanks in an
> aircraft ?
> Are fuel tanks always equalized with ambiant air pressure, slightly
> pressurized, or pressurized to the same pressure as is the main
> passenger cabin ?

On commercial a/c fuel tanks are vented to atmosphere.

> What about tanks which are inside the fuselage ? (eg: centre tank in a
> 747).
>Also vented to atmosphere.

On the A310 one option is an aux. fuel tank located in the aft. cargo
compartment. This tank is equalized to cabin pressure, do to the fact
that the tank has no boost pumps. Perhaps there are other a/c with
similar systems.

I hope this helps