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Using Gas in A Caravan |
Last month we investigated ways of utilising
12 volts electricity as a source of power. Now we will look
into ways of using gas. Caravanners in this country mainly
use Butane; a few use Propane. What is the difference? Both
liquefy at reasonably low pressures so can be stored as a liquid.
But as we noted when looking at refrigeration, allowing liquids
to gasify drops their temperature. Thus if the weather is very
cold and we are calling on a cylinder of Butane heavily, its
temperature may drop so low that the liquid freezes. Then gas
will cease to come off and out goes our heater. Propane however
freezes at a much lower temperature. Then why do we not all
use it? Mainly because it does not produce so much heat - its
calorific value is lower than Butane - and it also costs more. |
Not so many years ago most caravans were lit
by gas light. It is rather the exception now with the multitude
of fluorescent discharge tubes available, and we mainly call
upon gas for space heating and cooking. For short periods of
use there are many types of convector and gas fires available.
The difference? Convectors heat by first passing the hot gases
and heated air upwards and as these cool a little, they sink.
Thus it is always hotter overhead and the floor is cooler.
But they are safe when children are around. Fires can direct
the heat down at your feet more easily. It will also rise anyway.
But they should be fixed when youngsters are rushing about.
For long periods and all night use you should install a flued
heater as advised in previous articles. I have found the Holt
Rogers, the Morco and the Carver all satisfactory and their
acceptability and efficiency fairly mirrored in their ascending
price tags. |
A few years ago there was available a small instant
water-heater for caravans. Embassy amongst others fitted it
as standard. Then it disappeared and I received a lot of enquiries
for a substitute. I knew of none. But now T. B. Morley offer
the Morco Gasstar , a neat wall fitting heater measuring 14½" wide,
8" high and 4¾" deep. Water passed through this, either
from an electric pump or a hand or foot operated one, will
emerge, either cold or up to 4 pints a minute at 40°C (104°F).
The gas lights at the press of a button thanks to a Piezo crystal
and can only turn up high when water is actually running through.
Otherwise only the pilot burns. The price is £31 .80
plus VAT. |
Now whatever gas fitting you have been doing
it is vital that the system is not leaking-particularly if
there is a pilot light anywhere to trigger off an explosion.
Make yourself a Test Bottle. Look at my photo. You need
a small bottle with a strong well fitting screw lid. Fit a
rubber washer inside this and through it two lengths of ¼" copper
tube. The first goes to the bottom and the second is short,
Connect the long one to your gas supply and leave the short
unconnected at the moment. Put water in the bottle securely
blocking off the exit via the short pipe and turn on the gas.
A few bubbles will pass and then cease. If not then your bottle
is leaking somewhere. |
Now connect the short pipe to your caravan system
ant with all the outlet taps turned off, apply the gas pressure.
Bubbles will pass as the system pressurises but then they should
practically cease. If your system is 100% leakproof they will
stop completely but this practically never is sc Compression
joints should not leak but many taper barrel types do very,
very slightly. One firm of gas engineers say that so long as
there are not more than 10 small bubble a minute passing, it
can be considered satisfactory. B. I would hope for less. My
outfit passes 4 a minute which accept as good. |
Now to cooking. A good hotplate has burners with
small holes close together for lighting round, and it burns
with a clear flame. If it is yellow, suspect the jet. It should
be cleanly drilled with no burns as the small stream of gas
has to drag in a large amount of air, Clean it with a piece
of 5 amp fuse wire. The ring lights easily by match, flint
lighter or battery operated lighter. But you can have the press-button
lighting enjoyed by the water heater mentioned above or the
Carver Trumatic Heater or the Electrolux refrigerator. In the
shops now is the Junkers Piezo Gun. It looks like a pistol.
Pull the trigger and you cause a Piezo crystal to be struck.
This has the property of producing an electric current when
hit. Not much but very high voltage. So it produces a spark
like that at the point of a car sparking plug. Very high temperature
too. The exploded drawing shows how it works. It costs just
over two pounds including a fixing device. Mine hangs
on the door of the cooking locker. |
And now to cook the food. Non-stick pans have
made the "washer-up's" life much easier. But the handles of
saucepans take up so much room in the caravan cupboard. In
my lightweight tenting days I used removable handles. But they
were flimsy wire things. Now Harbenware have solved our problems.
A while ago they produced for us the "Compact" set - 3 saucepans,
a frypan , 3 egg poacher, all with lids and robust removable
handles. Even a non-scratch spoon and egg slice. And everything
goes inside the saucepan. What a saving of space. We put a
piece of polythene between the saucepans when packing up. This
prevents the non-stick surfaces from getting scratched. Harbenware
have now brought out a smaller set designed for two in a caravan.
My testers are using it in conjunction with a pressure cooker
and are quite satisfied. But the larger set is all sufficient.
It is the C.S.31 and priced at £9.36 and the smaller
CS. is £6.87. |
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The Harbenware Compact
Set. |
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Gasleak Testing Bottle |
Junkers Gas
Igniter (exploded View) |
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- Housing
- Piezo element assembly
- Spring
- Electrode
- Counter-electrode
- Self-tapping screw
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Morco Gasstar Waterheater
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Article originally published in Camping
and Caravanning - June 1973 |
Download this article
in PDF format |
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