Nick Alexander

"Ron Jones" <ron@ronjones.org.uk> wrote in message
news:02b13472$0$10197$c3e8da3@news.astraweb.com...
>
> I remember that change as well. But coal gas:air mixture is vastly
> different to butane:air - at work the bunson burners had jets around 2-3mm
> diameter for col gas and a pinhole for natural gas...
> <chemist hat on>
> If it claims duel-fuel, then I estimate it was desinged for butane....
> Butane needs 31 volumes of air to burn completly. Propane needs 23.9
> volume.
> One would not want to burn rich (i.e not enough air) as that would tend to
> make carbon monoxide, and a possible sooty flame, so therefore if set for
> butane, then there is more than enough air for propane - and no nasty
> by-products....
> Propane limits are 2.4-9.6% in air for burning (FWIW 1.9 to 8.6% for
> butane). So something like a 3.2% mix would be burnable for both gases
> and give complete combustion.
> <chemist hat off>
>
> --
> Ron Jones

So I guess that means my hat will stay firmly planted and I will not be
wandering about dazed, sans eyebrows, if I use the same gas as for the rest
of the boat, propane, having invested in an additional propane regulator and
orange hose, for the spare gas bottle...it will, of course, mean, though,
that both bottles unaccountably become empty at precisely the same moment
and I go without tea and hot shower one morning...

Thanks to one and all for your responses.
Nickalex