Quote:
Originally Posted by wdfifteen
Joint compound on iron pipe threads is just there to lubricate the steel-to-steel interference interface so the threads don't pull pieces out of each other as they grind together and distort, making the steel - to - steel seal. Once the pipes are tight the lubricant serves no other purpose. So any good pipe joint compound will work.
|
Not altogether true. In some instances overcharging the pipe system in testing (15 lbs. for 30 minutes) has blown out the compound. So 50 lbs. is no bueno.
Also the OP confuses. There are hard piped connections as well as the flex lines. Which one is being used? If flex, the only pipe compound used would be the shut off to hard pipe. Usually this joint is far enough out of the heat zone to require any special treatment. Use of the yellow tape is fine.
BTW. the way I read it is that a simple iron pipe with hole drilled is what's being installed and that is hard piped.
If you really want to get down to it, there very well may be info on your AHJ's web page or just the building dept in general.
Lastly, once past the shut off (unless some of the pipe is concealed), who cares? If it leaks inside the fire box it will ignite and you'll know where to reassemble and retighten.
Just kidding.
