From: Jason James on

"Paul Saccani" <saccani(a)> wrote in message
> On Sat, 30 Jun 2007 12:41:00 +1000, OzOne <> wrote:
> >
> >>The 351Ford can chew thru an 80 litre LPG cylinder in 4 hours towing a
> >>4 wheel trailer, that's *gas-flow*.
> >
> >There ya go....maybe ..if I can be bothered, I can work out if the car
> >was suffering a performance drop because not enough gas was liberated.
> Liquid is drawn from the container, not gas. The heat of
> vapourisation comes from the cars engine. The maximum amount of heat
> required for an 80 litre tank is in the order of 225 Joules. To
> supply that amount of heat over four hours is trivial at any ambient
> temperature above minus 25 �C.
> Before you go around trying to figure out performance drops etc... It
> might be worthwhile to obtain an understanding of the fundamentals.

Thanx for the info,..I knew the stuff was liquid in the bottle,..does it
turn to gas at the first regulator? Sumner-Miller used to do a gig where
water boiled agai if he pushed a cork into the bottle of water.


From: jonz on

"Athol" <me(a)> wrote in message
> Noddy <dg4163@(nospam)> wrote:
>> <OzOne> wrote:
>>> You'd need to look at the rate that the gas is liberated at various
>>> temps.
>>> One tank might not evaporate enough.
>>> This is the reason you often see multiple cylinders in domestic LPG
>>> installs.
>> I thought it was just for the storage capacity :)
> There are 2 inter-related issues that make dual cylinders desirable in
> domestic applications:
> 1. When filling, most places don't meter the gas going in, and simply
> charge you for the full capacity of the tank.

bullshit........all gas delivered in an in-situ fill setup is metered,
and you pay for what you get.........
> 2. You don't want to run out of gas.
> Obviously, if you have only one cylinder and you fill before running
> out, you get screwed on #1

see above................

.. If you hold off filling until you run
> out, you're likely to get screwed by #2 because it may be a few days
> until the next delivery can be made.

> With two, you run on one with the other's valve _shut_. When the one
> being used is empty, you turn on the other tank. In the case where
> you know that a cylinder is close to empty, you might open the valve
> on the 2nd one at night so that you don't run out in the middle of the
> night, but you'd still close it again during the day to make sure that
> you empty the other one ready for filling. Some domestic dual
> cylinder units run a switch so that only one tank can feed at a time

some? a switch is the norm.........must be a lotta shonks on your
dunghill methinks ???

> instead of having a pair of check valves and a hydrostatic relief like
> in an automotive dual tank setup. A selector without check valves or
> relief is obviously much cheaper to make...
> There are times when overnight temps can get down to the boiling point
> at atmospheric pressure, causing the propane to fail to have vapour
> pressure to push it out of the cylinder...
> Fortunately, we rarely see -42 degrees celcius around here. :-)
> OTOH, we do sometimes see -0.5 degrees celcius, at which the little
> dinky toy *butane* cylinders stop providing vapour pressure...

how to waste bandwidth for fun and profit hehe

> --
> Athol
> <> Linux Registered User # 254000
> I'm a Libran Engineer. I don't argue, I discuss.

From: Noddy on

<OzOne> wrote in message news:paub835im9hu7ovm7o2i6v3v6cmo40tjrn(a)

> Sure you were...It's obvious now eh....

To be honest I wasn't all that interested in the thread until I saw someone
else giving you curry, then it got my attention :)

> Only if "what it's used for" exceeds the liberation rate for one
> cylinder.


> Umm you said that was the reason...not one of them.....

Do beg my pardon won't you?

I missed my wheat bix this morning.


From: Noddy on

"jonz" <series11(a)landy> wrote in message

> bullshit........all gas delivered in an in-situ fill setup is metered,
> and you pay for what you get.........


When filling commercial bottles, you get charged for the capacity of the
bottle. Not the amount of gas puit into it. You also get charged by weight,
not by the litre.


From: Noddy on

<OzOne> wrote in message news:6g5c8390nomnvsmgakkrsqc3bp9m3qf1pq(a)

> Only those up to around 9kg.

Try 45kg.

More commonly referred to as "large plumber's bottles" You being a plumber
and all, I thought you'd know that :)

> In situ fills are metered.

It depends on the "fill"

For proper "fills" where they send a tanker out to fill a tank, then yeah
they are. However, in a lot of places where they change over forklift
bottles, they charge by the bottle and I've seen plenty that have been a lot
less than full.


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