Welding Regulator Leakage

I hooked up an oxygen regulator to a tank and opening the tank valve
slowly it registered about 2200 psi. To check for the seal at the
regulator connection I then turned off the tank valve with the regulator
closed so that the gage was reading only the pressure of the few cc's of
gas trapped between the regulator and the closed tank valve. The
pressure would drop about 25-50 psi per minute. It should be zero no?

John

J.Kahn wrote:
I hooked up an oxygen regulator to a tank and opening the tank valve
slowly it registered about 2200 psi. To check for the seal at the
regulator connection I then turned off the tank valve with the regulator
closed so that the gage was reading only the pressure of the few cc's of
gas trapped between the regulator and the closed tank valve. The
pressure would drop about 25-50 psi per minute. It should be zero no?

John

Yes. Should be zero loss and hold pressure for hours. Check for any
dents on the nipple of the CGA fitting.. any debris on the inside of the
valve stem.. and ensure the regulator itself is "closed" when you say
its closed... maybe put a balloon over the end of the outlet and see if
the balloon inflates.. spray soapy water on the CGA fitting when the reg
is attached to the bottle and charged,.. look for bubbles to indicate
the leak.


And remember do not use anything with grease/oil when doing this
troubleshooting (sorry if im stating the obvious)..

Dave

Dave S wrote:
J.Kahn wrote:
I hooked up an oxygen regulator to a tank and opening the tank valve
slowly it registered about 2200 psi. To check for the seal at the
regulator connection I then turned off the tank valve with the
regulator closed so that the gage was reading only the pressure of the
few cc's of gas trapped between the regulator and the closed tank
valve. The pressure would drop about 25-50 psi per minute. It
should be zero no?

John

Yes. Should be zero loss and hold pressure for hours. Check for any
dents on the nipple of the CGA fitting.. any debris on the inside of the
valve stem.. and ensure the regulator itself is "closed" when you say
its closed... maybe put a balloon over the end of the outlet and see if
the balloon inflates.. spray soapy water on the CGA fitting when the reg
is attached to the bottle and charged,.. look for bubbles to indicate
the leak.


And remember do not use anything with grease/oil when doing this
troubleshooting (sorry if im stating the obvious)..

Dave

Got it to seal after removing to clean up and reinstalling. Thanks.

John

"J.Kahn" wrote in message
...
Got it to seal after removing to clean up and reinstalling. Thanks.

John

Don't forget to open the Oxygen valve (on the tank) all the way when using
the torch. It has a double seat; so when it is open fully, there is no gas
pressure on the stem packing.

Rich S.

On Tue, 31 Oct 2006 17:21:07 -0800, "Rich S."
wrote:

"J.Kahn" wrote in message
.. .
Got it to seal after removing to clean up and reinstalling. Thanks.

John

Don't forget to open the Oxygen valve (on the tank) all the way when using
the torch. It has a double seat; so when it is open fully, there is no gas
pressure on the stem packing.

Oxygen all the way to the stop.
Acetylene no more than necessary.


Rich S.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com