YES and No Yes if you are going to be working on the gas water heater and No if you are working on a cold water line and if you are working on a hot water line you can shut off the gas or electric to the water heater so in case your water heater drains but what I usually do is just turn the water heater's water supply valve off.
It is not advisable to bury a galvanized gas lineMost civilized codes will not allow galvanized piping to be buried under ground even for waste or venting it is against good plumbing practices. I have seen quite a bit of buried galvanized pipe, both for water and gas. It does rust out eventually. Interestingly enough, it usually rusts through at point at which it comes up out of the ground.
Install in gas line to shut off gas to building after gas meter, or to isolate an appliance off a gas line.
Simple, to remove the air so the gas will reach the appliance
No.
Of course you can. However, it is not recommended to bury gas lines too deep in order to allow easier maintenance and easier installation.
The gas in the line contains a proportion of water vapour (which is also a gas). When the gasses in the line cool below the dew point for the gas water vapour mixture, water condenses out of the gasses inside the gas pipe.
The best thing do with that is not to do it yourself. Call the gas company and they will come out and hook up the gas line for you for no charge.
WATER
YES and No Yes if you are going to be working on the gas water heater and No if you are working on a cold water line and if you are working on a hot water line you can shut off the gas or electric to the water heater so in case your water heater drains but what I usually do is just turn the water heater's water supply valve off.
Wrap the pipe threads with a thin layer of yellow tape and then screw the pipes together. pretty simple. If you can't do this then you shouldn't be messing with gas!
To purge a gas line go to the gas line at the appliance. Turn the gas cook(cut off) to the off position(perpendicular to the gas line). loosen the gas line on appliance side of gas cook (this is done at a flare fitting or union). Next turn the gas cook back on until you smell gas.Turn gas back off and re-tighten gas line. Turn gas back on and check for leaks(50/50 water and dish soap sprayed onto fittings). No bubbles means no leaks.
depends on the delivery pressure of the gas....
Either a fuel line de-icer or a fuel line dryer.
Have you tried using gas line antifreeze? That will help to remove some of the water in the gas. The best way to make certain all the water is out of the tank is to siphon the gas out, let the tank air out and re-fill the tank with gas from a station you know does not have water in the gas.
Because they are mixed together it becomes heterogeneous.
Solid, liquid, and gas exist together. Apex