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so let me get this straight, you have a ng line you think, that you want to use for a grill and you don't know if there's a shut off and the pipe shows signs of corrosion and you have people telling you to use spark generating tools to take the rusty cap off.....you should listen to them and go for it and take some video.
Oh and call the Gas Company and find out how much they love it when people shut off gas lines instead of calling them to do it.
If you have to drain the entire house system, there could be a moderate volume of gas come out. Do you have a gas fireplace where you can let the pressure out?
There needs to be a valve for that line, it could be far from the wall in the middle of the house. It's probably off right now, so you'll have to find it.
Its gonna open fine, there is tape right on the threads, put a counter torque wrench on the nipple and another to twist the cap off.
Two guys will have no more leverage than one guy working two wrenches against each other.
well, I like your optimism, but it doesn't look like tape to me, more likely dope which will probably not help. I really doubt it'll come right off and if I unscrew the nipple any, I'm screwed. I'm leaning away from trying to twist this thing off with brute force as is. Little room for error.
mmm.... how about if I manually hacksaw deep slits on the threaded part of the cap with plenty of oil after relieving the pressure in the gas system? As long as I don't cut through, it should be perfectly safe. I could then try to twist the cap gently and with a bit of luck the slit will have relieved stresses and/or the cap may just split open?
The hammering on it with a dolly is a good idea if I can do that without shaking the whole line.
(And what exactly do some of you think that a professional plumber would do to resolve this that a bunch of clever mudders can't think of? Plus I don't think he would be particularly worried about breaking the seal at the nipple junction ("Sorry Mam, through an act of god your line got unscrewed, we have to break the wall down, it'll be $2,000..." ) )
(and what is this about the gas company being upset if I turn off the main valve? what's wrong with that? isn't that what they are for?)
Natural gas only burns at about a 5% to 15% concentration in air, so it won't burn inside the pipe. I've accidentally opened a natural gas pipe that was pressurized, and just threaded it back together, so Calstyl's method would certainly work.well i guess you are right. the thing you are missing is what stops the flame from going in the pipe?
Scott, I sure hope there isn't a valve, cuz I don't know where that would be...
Maybe it doesn't, but if they installed a line specifically for an appliance it should. Check around by the furnace, follow the gas line, you may find it there. If there isn't one just be sure to install a gas valve out there, not just any valve. I'm going to help my son-in-law plumb his up, found the valve inside, think I'll put another out by the deck.