Which suggests that the metal part of the breather tube should be bonded to
the metal surround of the filler cap and the refuelling nozzle kept in
contact with the latter whilst refuelling?
Duncan McF.
----- Original Message -----
From: "Graham Singleton" <graham@gflight.f9.co.uk>
Subject: Europa-List: Static Charges and how to avoid them
<graham@gflight.f9.co.uk>
>
> > > I would go for the aluminium elbow at the bottom of the XS filler
> > > moulding, get some coarse mesh attached at the lower end, then
> > > ground the elbow with every other metal bit, including of course
> > > the filler cap.
> >
> >I'm unclear what problem this is solving. Static generated in the fill
> >pipe? The Fiberglass Tank and Pipe Institute say that static charge in
> >nonconductive pipe is all about velocity, with fuel flow of 12 ft/sec is
> >a typical threshold. In the Europa Mk 1 filler pipe, that requires 120
> >gal/minute! But such velocity can be created by whirlpooling fuel down
> >a plastic funnel, and thus refiners say don't ever do that
>
> Fred
> My plan is to dissipate any static charge generated. We know it does
arise,
> G-BWDP caught fire. I am reliant on the memories of two guys, one of whom
> got burnt on the arm, so their memory of the sequence of events might
have
> been diluted by the trauma at the time.
> Considering the velocities involved, the worst case is the speed of the
> air/fluid flow through the breather tube, (which also slows down filling)
> eventually the breather lower end is submerged, it's fuel that has to flow
> then. DPs fire happened right at the end of refuelling .
> Graham
>
>
> ---
>
>
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