[AT] Air lines for shop: Finished with review

[Dennis Johnson]

I agree that stainless is a real challenge for threading. I worked as a maintenance engineer when our company got into nitrogen pumping, where we pumped it as a liquid, and then vaporized it to pump into wells, or other places. Everything from the tank to the vaporizer was stainless. Just to make it interesting, the temperature between the liquid and the vaporized gas averaged 400 to 450 degrees F, and the pressure was between 2000 and 10,000 PSI. In other areas, pressure was up to 15,000 PSI. What we found worked best was a bronze anti-seize compound.
We worked real hard to eliminate most all pipe threads, because they were such a pain to try and seal.

Dennis


Sent from my iPad

On Nov 3, 2021, at 10:07 PM, Brad Loomis <brad.loomis at gmail.com> wrote:


That is somewhat de rigeur around here for many of the ammonia pipe fitters and industrial plumbers. Most are using teflon dope as well as tape. Or Blue Magic. The worst is stainless pipe as galling is a delight. Any of it is susceptible to galling. I always say a prayer when using stainless, which is almost daily. Stainless Nylon stop nuts almost always gall even with anti-sieze. And if you want it to really seal then use X-pando. Mix with water.
As an aside, I serviced and installed ice machines for years. I have seen where a restaurant owner used practically an entire roll of teflon on 2 - 3/4" pvc fittings. :/
Brad

On Wed, Nov 3, 2021 at 4:28 PM Carl Szabelski <c.s.szabelski at gmail.com<mailto:c.s.szabelski at gmail.com>> wrote:
Applying both tape and sealing compound is becoming the new norm for any pressurized system. I can see it from just using tape that can become shredded as a fitting is threaded and tightened, especially if too much tape is used. The application of the compound might be seen as applying a lubricant that also seals. As long as there is no chemical reaction between the two, there shouldn’t be an issue with using both.

Carl

On Wednesday, November 3, 2021, Roger Moffat <rogerkiwi at gmail.com<mailto:rogerkiwi at gmail.com>> wrote:


On Nov 3, 2021, at 3:44 PM, Spencer Yost <spencer at rdfarms.com<mailto:spencer at rdfarms.com>> wrote:

All the leaks I had were NPT leaks at the terminal equipment.

I noticed in the installation instructions I found on the Rapid Air site, it talks about wrapping 2 turns of teflon tape around them, and then using pipe sealing compound on that.

I’ve never done such on anything I’ve worked on in the past, but the well guys that were here some years ago and replaced the pressure tank in the basement did that on all the joints they made.

Roger
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