Received-SPF: none
 receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net
From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: hauling gas
Date: Tue, 10 Feb 2009 09:06:37 -0800
Message-ID: <55DED20F031A4E0E89FF816073D54AFE@BigAl>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
In-Reply-To: <list-3485743@logan.com>
Importance: Normal

Al Gietzen wrote:
>
> My simple approach is to use a metal chain, which serves as cap retainer,
> which hangs from the metal cap flange into the fuel, back to the cap.
> Contacting the end of the hose to cap/cap flange prior to removal takes
car
> of any residual.  Maintaining contact between the hose and the flange
> (keeping the cap chain, or cable, hanging into the fuel) keeps fuel and
hose
> at the same potential.
>
>  
Al, you're giving me the heebee-jeebees here.

The problem is that the can and fuel in the tank may already have a 
differential charge built up.  Then you may be getting an invisibly 
small spark connecting the can to the chain in the tank.  The spark 
would have to be at just the right place to get a fuel-air mixture to 
ignite, so chances of bad things happening are extremely low.  But such 
an easily remediated exposure.

Ernest;

Maybe one of us is missing a step here.  I contact can (or hose) to the
cap/flange prior to removing the cap, then maintain contact with the flange
during fueling (flange connected to the fuel via the chain.  I believe that
takes care of any a priori differential.  No?

Al G