no you can not
Not sure what you mean by pressure fittings. Threaded fittings for steel pipe are pressure fittings. Steel pipe with a 3/4" O.D. is known as 1/2" I.P.S. (Iron Pipe Size) pipe.
No, proper pipe dope that is approved for gas installations must be used on all threaded fittings. Using substitutes will not guarantee that a tight fit will be made which can lead to gas leaking into the house.
Yes you can run threaded gas fittings in any wall. Just no mechanical joints, (unions, flared fittings ect.). Just make sure you test the line with air. Our company tests at 20lbs and usually leave it overnight to see if there's a drop. This is plenty because you gas line usally only produces a couple pounds of pressure or less. Use teflon tape and pipe dope on every joint. BEFORE using "Teflon" tape make sure it the type approved for the type of "gas" your using. The white Teflon tape is NOT approved in many places as approved for gas service
No. For poly pipe they make specialty quick connect fittings that may/may not be approved for use in your area. But for metal pipe, there is no acceptable pipe connection except threaded. This is California plumbing code.Your area may differ.
No. You can use flared fittings with a flaring tool and soft copper pipe.
No. Victaulic fittings are rated for a wide range of liquids, but the only gas they're rated for is air.
You do not need tape on any flared fitting, brake or regular. The brake line and the fittings are different size and thread type than regular copper line and fittings. You can't mix them.
To the best of my knowledge propane gas line cannot be connected by soldering. You have to use compression fittings with a flaring tool like you would use to flare fittings on an automotive brake line, however if you are unfamiliar with gas and how to use it I would suggest using a reputable contractor who specializes in heating. I have installed lines in my own home, and also am a general contractor, but still get nervous when dealing with gas. It can be very dangerous and if no ventilation, may cause you to pass out or even possibly be fatal. Please be extremely careful, best wishes.
depends if it a metal line or the plastic line. if it's metal you can use union fittings and a short pice of the same size line., if it's plastic then your screwed, you will need to replace the entire thing.
Remove fittings at both ends and use an air blower to clear out line.
Yes, you can use brass fittings or the plastic fittings that snap onto to the plastic line. I like the snap on fittings.
no