Flow Nitrogen Great Again
HVAC School - For Techs, By Techs
Bryan Orr
4.9 • 1K Ratings
🗓️ 10 November 2016
⏱️ 21 minutes
🧾️ Download transcript
Summary
In this episode of the HVAC School Podcast, Bryan talks with Tim Bagnall about flowing nitrogen.
Many techs don't flow nitrogen. Some may say that it is overkill, but it has been shown that flowing nitrogen displaces oxygen while brazing and prevents harmful scale from forming on the copper. Scale is very problematic, and it will likely ruin your copper lines if you keep those lines open to air. (The jury is still out as to whether climate/geography affect scale formation, though.)
There are many different intensities for flowing nitrogen, particularly high-pressure purging and low-pressure flowing (2-5 SCFM). You may also have heard that you should flow nitrogen at 1.5-3 PSI, though SCFM is the preferred unit. Some best practices for flowing nitrogen while brazing include using wet towels or heat-resistant putty on the service ports, removing the Schrader cores, removing the TXV sensing bulb before brazing, and watching your torch control so that you do not overheat the metal.
Join us today as we discuss the following:
- The proper tools and flow settings for brazing
- How the pressures should be set to SCFM and not PSI
- The possibility that geography may contribute to scale
- How to flow nitrogen in a practical way
And much more...
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Transcript
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| 0:00.0 | You know we learned that red counties and blue counties they don't always agree and there's a lot of division but the one thing we can all agree on is that this |
| 0:16.3 | podcast is sponsored by HVAC-HACs. |
| 0:20.3 | com HVAC HACs wants you to remember. |
| 0:24.5 | Don't be a hack. Sir, in a video press conference back in 2002 you stated and I quote here |
| 0:43.2 | flowing nitrogen is for chumps could you comment on that? |
| 0:46.8 | No I never said I don't flow nitrogen |
| 0:49.5 | nobody flows more nitrogen than I do. |
| 0:51.8 | I flow the most nitrogen of anyone. So much |
| 0:55.7 | nitrogen, believe me, I did not say that. |
| 1:01.0 | And now the man who thought dad jokes were funny before it was cool. |
| 1:06.0 | Wait, it's still not cool? |
| 1:08.0 | Brian Orr. |
| 1:10.0 | Hey, this is Brian Orr and and this is HVAC School. |
| 1:13.2 | The HVAC School Podcast, I should say. |
| 1:15.9 | And today on the podcast I have Tim Bagnol on. |
| 1:18.1 | He's actually a technician in the great deserts of our southwest, and Tim kind of called me to task on what I had said |
| 1:26.0 | at one point about flowing nitrogen and I really liked his email I really like his |
| 1:31.3 | take on this and so I wanted to just play our conversation. |
| 1:35.0 | We actually just had a phone conversation. |
| 1:36.6 | I said, you know, Tim is okay if I record this because I think this may have some value. |
| 1:40.2 | It's just a conversation so it doesn't necessarily stay right on track. |
| 1:44.0 | But there's a couple of things here. |
... |
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