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Purging the gas line
Posted: Sun Jul 06, 2014 8:15 pm
by 450dualsport
This is probably a silly question, but it is something I have wondered about. Is it necessary to purge the gas line when done welding or is it sufficient to just close the tank valve and let the gas in the line and the machine slowly leak out?
Thanks.
Re: Purging the gas line
Posted: Sun Jul 06, 2014 9:29 pm
by Mongol
It wouldn't hurt but I'd consider it unnecessary.
Re: Purging the gas line
Posted: Sun Jul 06, 2014 10:48 pm
by dirtmidget33
I was taught to
1.turn off tank
2. Purge lines
3. Back off regulator
Reason being is to relieve preasure on springs and diaphram , if it is diaphram type regulator lets the diaphram relax. Is it necessary cant say for sure but it supposed to increase life of regulator I continue to do it but very anal about tools and keeping shop clean. Job not done until mess from that job is cleaned up. Customer pays for clean up time all part of the job.
Re: Purging the gas line
Posted: Sun Jul 06, 2014 11:15 pm
by MinnesotaDave
dirtmidget33 wrote:I was taught to
1.turn off tank
2. Purge lines
3. Back off regulator
Reason being is to relieve preasure on springs and diaphram , if it is diaphram type regulator lets the diaphram relax. Is it necessary cant say for sure but it supposed to increase life of regulator I continue to do it but very anal about tools and keeping shop clean. Job not done until mess from that job is cleaned up. Customer pays for clean up time all part of the job.
+1
same here on all counts
Re: Purging the gas line
Posted: Mon Jul 07, 2014 12:05 am
by GlenC
+2
Re: Purging the gas line
Posted: Mon Jul 07, 2014 12:30 am
by 450dualsport
I have always purged the line just because it seems like the right thing to do. I just wasn't sure how necessary it is....
It is easy on the Mig welder, I just disengage the drive rollers and hold the trigger down until the regulator and line purges.
On the Tig welder, I understand that you are not really supposed to let the HF run for extended periods, so I close the tank valve and initiate the arc for a second and let the post flow purge the flow meter and line. Does anyone have a valve installed for purging?
Re: Purging the gas line
Posted: Mon Jul 07, 2014 2:28 am
by RichardH
450dualsport wrote:Does anyone have a valve installed for purging?
This is a nice feature of at least some Everlast TIG machines - a front-panel gas purge button. It'll run for 10-15 seconds if you don't tap it again to shutoff. I use it to prime the line during setup and bleed it when done. (210 EXT model)
Conversely, the machine's too smart to use the post-flow technique. If it doesn't see that an arc was established, it won't do post-flow.
Cheers,
Richard