Originally Posted By: Brian Silowash
This post was automatically imported from our archived forum.
I saw this mentioned in the Natural Gas Lines thread, and I wanted some more opinions…
I do not see anything wrong with using Teflon tape on NG piping (as opposed to pipe dope). Teflon is a perfectly acceptable sealant in this application, as far as I know. I have seen different types of tape for sale though, for instance at Home Depot. The explanation I got there was that the blue tape was for gas, and the yellow tape was for potable water (maybe it was vice versa -- it may even have been another customer offering the explanation). It was some time ago, but I seem to recall reading the labels, and the only difference I could see was that the thicknesses were different. This doesn't seem to make sense to me, since all you would have to do would be to put another wrap around the joint.
I have seen Teflon tape specified on high pressure industrial gas lines, with no ill effects. What have you heard, and what may I be missing?