You do not need a floor flange and a floor flange is not made to couple two pipes.
How to install a gas line floor flange.
I did it myself and i have some great practical advice for installing a natural gas stove in your home.
Remember to apply pipe thread compound or gas rated teflon tape to the threads on threaded connections before assembling them.
On the stove end use another flare to pipe thread fitting.
The gas valve is installed to the treads of the compression nut after it the nut is installed into the flange.
Threaded pipe flange is supplied with a tapered internal thread that the pipe screws into.
Flare joints rely on a tight fit to seal and don t require additional sealant.
Again you are correct that a gas valve is needed near the dryer.
Coat the threads of the pipe ends using pipe dope.
In a typical gas line installation teflon tape or pipe joint compound should always be used on the threads to insure there are no leaks.
I also had to add onto the existing natural gas supply line in my home to make this work.
In fact a floor flange is only used to make a supporting pier from pipe materials it is never used for pipes with any flowing fluid inside the pipes.
In my limited experience i ve only seen these flanges used for non plumbing purposes by guys who build shelves furniture with black pipe.
This is essential to establishing an airtight fit.
Its not like a coupler for instance where a pipe can screw into both sides.
If using a pipe thread sealant tape wrap it around the threads and insert into the fitting.
The yellow pipe you attached to the flange can then be attached to a black pipe fifing with the proper fittings.
Then use the adapter included with your hookup kit to connect the flexible gas line.
Never use tape including teflon tape.
It s been quite an ambitious learning experience for me but it s also been a rewarding one as well.
Threaded flange find applications in areas in which hot work welding burning and grinding is undesirable.
