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Posted by Bob Gentry on March 20, 2008, 7:20 pm
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On Thu, 20 Mar 2008 12:50:42 -0700 (PDT), Andy Dingley
>
>> When I used to work in a local gage test shop (pressure, temperature,
>> etc.) we made our own dry ice blocks for temperature tests. This was
>> done by inverting the CO2 bottle and running the output through a two
>> piece block with a filter screen on the exhaust side.
>
>That's regarded as bad mojo locally. I've never heard a good
>explanation why though, other than that the gas supplier would rather
>rent you yet another cylinder, this one with a dip tube running down
>inside.
Valid point :)
This was 38 years ago
regards, Bob
rgentry at oz dot net
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Posted by Andy Dingley on March 20, 2008, 3:54 pm
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> I guess my question is mostly about oxygen bottles. IIRC, propane,
> acetylene and CO2 are all liquid inside the bottle and have to be mounted
> vertically.
Vertically mounted is bad enough for acetylene in a truck. You really
ought to leave it parked up and stable for a good while, so as to let
the acetone settle back down. I certainly wouldn't use anything other
than vertical, if it was regularly getting shaken around before use.
Propane is a liquid and you don't want the liquid to carry over into
the regulator either (although it's not such a problem as acetylene).
If you need to mount them horizontally (fork-lift truck), the
cylinders are specials with an internal "anti dip" tube to reach up
into the gas ullage space. These not only have to be mounted
horizontally, they always have one particular direction for "up".
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Posted by NewsGroups on March 20, 2008, 5:12 pm
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>> I guess my question is mostly about oxygen bottles. IIRC, propane,
>> acetylene and CO2 are all liquid inside the bottle and have to be mounted
>> vertically.
>
> Vertically mounted is bad enough for acetylene in a truck. You really
> ought to leave it parked up and stable for a good while, so as to let
> the acetone settle back down. I certainly wouldn't use anything other
> than vertical, if it was regularly getting shaken around before use.
>
> Propane is a liquid and you don't want the liquid to carry over into
> the regulator either (although it's not such a problem as acetylene).
> If you need to mount them horizontally (fork-lift truck), the
> cylinders are specials with an internal "anti dip" tube to reach up
> into the gas ullage space. These not only have to be mounted
> horizontally, they always have one particular direction for "up".
The standard fork lift cylinders I have used supply liquid propane
to the vaporizer in the engine. The did tube extends to the bottom of
the tank to provide this liquid.
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Posted by RLM on March 20, 2008, 6:16 pm
Please log in for more thread options On Thu, 20 Mar 2008 12:54:57 -0700, Andy Dingley wrote:
>> I guess my question is mostly about oxygen bottles. IIRC, propane,
>> acetylene and CO2 are all liquid inside the bottle and have to be mounted
>> vertically.
>
> Vertically mounted is bad enough for acetylene in a truck. You really
> ought to leave it parked up and stable for a good while, so as to let
> the acetone settle back down. I certainly wouldn't use anything other
> than vertical, if it was regularly getting shaken around before use.
I agree except for the propane tanks and not so sure on CO2.
>
> Propane is a liquid and you don't want the liquid to carry over into
> the regulator either (although it's not such a problem as acetylene).
> If you need to mount them horizontally (fork-lift truck), the
> cylinders are specials with an internal "anti dip" tube to reach up
> into the gas ullage space.
Forklift engines that are water cooled use liquid LP that is vaporized
when run through the water heated vaporizer and the pressure is stepped
down and tested with a common 30# pressure gage to be used by a demand
style carburetor. Some systems use both a vaporizer and regulator that
drops the pressure of a gaseous state of LP and then LP in a gaseous state
goes to the carburetor at low pressure depending on the manufacturers
specs.
Air cooled engines use a vapor withdraw tank. An air cooled engine
regulator usually must be set using a manometer.The regulator drops the
gaseous fuel to the carburetor. The higher rate of gaseous withdraw from
the tank acts as a leak and freezes and limits horsepower. This is the
main reason that liquid is used on water cooled engines.
When you see LP that shows frost, the LP is really boiling away because it
boils at an extreme low temperature. Gloves and extra care should be
practiced when this condition exists.
>These not only have to be mounted
> horizontally, they always have one particular direction for "up".
When mounting the tank horizontal, the tank has a location hole that must
be over a pin at the bottom of the tank bracket or you won't be able to
withdraw all of the fuel in the tank. The same tank can be mounted
vertical. The drop tube is flexible to pick up in both directions. This is
a liquid withdraw tank.
The shut off valve is either mounted in the vapor or liquid hole on the
top of the tank itself. Depending on which style tank you order. They both
look the same except for the valve mounting.
This is a common misunderstanding. There were some horizontal only tanks
that had a bent dip tube years ago. I imagine they have all been replaced
by now by the dual use tanks with a flex tube inside.
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Posted by Don Foreman on March 20, 2008, 4:11 pm
Please log in for more thread options On Thu, 20 Mar 2008 09:04:07 -0800, "SteveB"
>I guess my question is mostly about oxygen bottles. IIRC, propane,
>acetylene and CO2 are all liquid inside the bottle and have to be mounted
>vertically. OR, could they be mounted at a 45, particularly an acetylene?
>
>My trailer has an O2 and an acetylene mounted vertically. They both were
>mounted with plate that is about 3/4" thick, and came from some salvaged
>use. They look like crap, and were gorilla welded on. But I don't like
>their high profile. The O2 is a full sized tall tank, and the acetylene is
>stubby, about waist high, but not the fat round one. If I stay with
>propane, I'll use the shorter tanks anyway, or go with a stubby fat one that
>won't stand that high anyway. But the O2 just sticks up there way high, and
>I don't like the leverage it has that way in sudden maneuver driving
>situations.
>
>I believe that I could mount the O2 horizontally, and it wouldn't matter.
>Is that correct? I don't use a CO2 on the rig, but down the line, who
>knows. I do have an acetylene bottle there, but may go to propane. Would
>the acetylene be okay mounted at a 45?
>
>Steve
Check with a dealer. There may be DOT regulations about transporting
pressurized cylinders greater than a certain size in any position
other than vertical. It has to do with safety rather than function.
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