will an ordinary gas cooker work on bottled gas?
Howie
France. The house in France has no mains gas but they often have
large bottled gas supplies outside the house.
Will any cooker work on bottled gas?
TIA.
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Rob Bashford
"> Hi. I have a 2-year old gas cooker which I want to take to
> France. The house in France has no mains gas but they often have
> large bottled gas supplies outside the house.
>
> Will any cooker work on bottled gas?
Only if you can substitute the current gas jets with alternative LPG jets.
These should have been supplied with the cooker when you bought it. Then it
will work fine, after you have adjusted each burner individually. This is
usually a small screw hidden in the gas burner valve shaft, accessible by
removing the knobs. You need to do this to ensure the gas doesn't go out
when you turn the knob to the simmer position.
Bob Minchin
Bob
Howie
OK. Thanks for that. I wonder why the jets need to be different?
Appreciate your help.
Regards,
Howard.
Howie
<nos...@falseaddress.com> wrote:
|Didn't you like the answers you got to this question a couple of weeks ago??
|
|Bob
Hi Bob.
Do you know, I use Agent as my newsreader and it has served me
well over the years. However, this particular (original) message
disappeared without a trace. I assumed (wrongly) that it never
got propogated.
Sorry to ask it again, - but I really have no idea where it - or
the answers to it, went.
Wierd.
Howard.
Dave Liquorice
> I wonder why the jets need to be different?
Different Calorific Values between natural gas and LPG the pressure at the
cooker is the same within a few millibars.
NG has a CV of around 39MJ/m^3
Butane around 118MJ/m^3
Propane around 94MJ/m^3
http://www.kayelaby.npl.co.uk/chemistry/3_11/3_11_4.html
LPG is mostly propane.
--
Cheers
Dave.
Bob Minchin
Your Q & A's are still on my (ntl) newserver.
To answer your other query, natural gas and bottled gas are chemically
different and at possibly at different pressure and need a differing mix
of air/gas to burn cleanly with a blue flame. The air holes tend to be
fixed and quite large so the designs use a different jet size to change
the volume of gas.
You can soon tell is all is correct as the flame should be blue over the
whole range of flame sizes, and not produce soot on pans etc.
Bob
Andy Champ
I think you'll find that the viscosity and correct gas-air mixture vary.
I'm not sure the calorific value matters much, except for how long it
takes a kettle to boil.
Andy
Dave Liquorice
> I think you'll find that the viscosity
Possibly butane and propane molecules are bigger but gases are weird
things and don't have much viscousity in the first place.
> and correct gas-air mixture vary.
I'd expect that to be proportional to the calorific value of the gas. All
the energy comes from the oxidation, the amount of oxygen available is
fixed (more or less) by the amount in the air and how much can be drawn in
through the air hole.
I've had a dig about on't 'net and not come up with anything that ties
LPG, NG, pressures and jets together. Confidence is high that LPG jets are
smaller, the gas/air ratio for efficient combustion is markedly different.
Supply pressures?
> I'm not sure the calorific value matters much, except for how long it
> takes a kettle to boil.
I've not noticed any significant difference in the time to boil a kettle
on a NG v LPG fueled ring. Certainly not the 1/3 or so difference in the
calorific values would indicate.
--
Cheers
Dave.
Gib
10 years ago when we returned to NZ from the USA we brought with us a
big old gas range that had been in our house in California, that we'd
become attached to. Until now we haven't had the opportunity to use
it, but now we are moving into a house with a big kitchen, and I've
started thinking about getting the stove working. Because it has been
sitting for a long time it has suffered a bit of corrosion, so it
isn't 100% clear that it will work. The house doesn't have a gas
supply as yet, but we can get it installed quite easily. I'd like to
test the stove in advance, and had the idea of getting a small gas
bottle for that purpose. (This thing is massive, and getting it up
the stairs into the kitchen is going to be a major production, hence
my desire to check it out first.) I'm not sure how to ensure that I'm
delivering gas at the right pressure. Would the gas regulators that
people commonly use for BBQs deliver the right pressure? What is the
mains gas pressure typically? I realize that the differing CV of NG
and propane will confuse the issue somewhat, but my main concern is to
check that the gas flows freely through all the jets. Both the air
vents and the gas jets are adjustable on this range, so I feel
confident that it will be possible to tune it correctly for our mains
gas, when it is installed (I'm not assuming that I will be the right
person to do this).
Andrew Gabriel
I think it very unlikely you will have sufficient adjustments
to allow same jets to be used for NG and LPG. If you adjust the
gas flow so that you have the correct gas rate for the burner
power given the different CV and density/viscosity, you will
have the wrong gas velocity for the air mixing and the wrong
mixture velocity for a stable flame.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
Gib Bogle
Using LPG will be a temporary measure to check operation of the burners.
I will not try to adjust them to use LPG. If all is OK I will get
mains gas, which is NG. My questions relate to pressure when using a
gas bottle for testing: "I'm not sure how to ensure that I'm delivering
Ed Sirett
1) The adjustments will not be so great as to allow the wrong fuel to be
used.
2) Will you need to find someone prepared to fit this? It is presumably
for use on NG? You do have the manual?
3) IME large US ranges of the type you probably have will require a
pressure regulator in the supply.
4) It will probably need a gas supply for 30kW + i.e. 22mm short run or
28mm on a medium length run.
5) I strongly urge you not to improvise with LPG.
--
Ed Sirett - Property maintainer and registered gas fitter.
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