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Posted by Ignoramus14646 on November 10, 2008, 1:52 pm
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As I mentioned previously, I have two acetylene tanks, 145 CF and 397
CF.
So I bought some O/A kit that includes a regulator, among other
things.
Here's something that concerns me: the 397 CF tank, seems to leak
acetylene from the seal between regulator and tank. The symptom of it
is that the high pressure gauge shows pressure that declines
relatively rapidly if I close the tank valve. I would say most
pressure is lost in one minute. This makes me concerned since
acetylene is explosive.
Here's my findings:
1) Quick pressure loss with tank valve opened and then closed, happens
on the 297 CF tank
2) it does not happen with the 145 CF tank, or at least it is
extremely slow
3) The rate of loss on 397 CF tank seems to depend from how tightly I
tighten the connecting nut. The tighter, the slower is the leak. I am
not sure how hard I can push that brass nut, but my guess is not too
hard. I used perhaps 50 Ft/lbs or so of force.
Any thinking on this. Thanks.
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Posted by glyford@gmail.com on November 10, 2008, 2:34 pm
Please log in for more thread options > Any thinking on this. Thanks.
Yeah, five minutes with a canfull of water, a few drops of dishsoap,
and a chip brush should be pretty evident.
Might your gas supplier give you credit for a mostly full tank when
you exchange it? My first instinct in this situation is to make it
someone else's problem... trying to fix it on your own is likely to
only lead to madness or injury.
--Glenn Lyford
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Posted by erngineman on November 10, 2008, 3:48 pm
Please log in for more thread options Try tightening the packing nut on the cylinder valve.
Checking for leaks with a soap solution is a good idea.
I use 409 cleaner in the spray bottle.
Engineman
> > Any thinking on this. Thanks.
>
> Yeah, five minutes with a canfull of water, a few drops of dishsoap,
> and a chip brush should be pretty evident.
>
> Might your gas supplier give you credit for a mostly full tank when
> you exchange it? =EF=BF=BDMy first instinct in this situation is to make =
it
> someone else's problem... =EF=BF=BDtrying to fix it on your own is likely=
to
> only lead to madness or injury.
> =EF=BF=BD --Glenn Lyford
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Posted by Leo Lichtman on November 10, 2008, 4:01 pm
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"erngineman" wrote: Try tightening the packing nut on the cylinder valve.
Checking for leaks with a soap solution is a good idea.
^^^^^^^^^^^^^^^^^^^^^
Chances are it's in the cylinder-to-regulator connection, since the OP says
the tighter he makes the connestion the slower it leaks. Now, to determine
whether it is the regulator or the tank valve, swap the regulators to the
opposite tanks. If the big tank still leaks, it should go back to the
dealer. If the leak moves to the smaller tank, the regulator needs help.
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Posted by Ignoramus14646 on November 10, 2008, 4:17 pm
Please log in for more thread options >
> "erngineman" wrote: Try tightening the packing nut on the cylinder valve.
> Checking for leaks with a soap solution is a good idea.
> ^^^^^^^^^^^^^^^^^^^^^
> Chances are it's in the cylinder-to-regulator connection, since the OP says
> the tighter he makes the connestion the slower it leaks. Now, to determine
> whether it is the regulator or the tank valve, swap the regulators to the
> opposite tanks. If the big tank still leaks, it should go back to the
> dealer. If the leak moves to the smaller tank, the regulator needs help.
Leo, it is the tank end for sure. When I move the same regulator to
the small tank, no leaks. I will try to clean it inside with
scotchbrite or something like that.
i
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