My preferred material is yellow plastic pipe (actually polyethylene) but it is not available in most big box stores and the metal risers required are pricey and need a specialized tool to make the connection to the poly. Supply houses typically only sell in minimum of 250 foot rolls. More common for short runs is the green coated "black iron" (actually steel) pipe that is available at big box stores. You will need a primer and special tape to wrap each joint that is underground (also available at the box stores). The threaded portion is the most vulnerable to corrosion as the pipe is thinner at that point and moisture tends to accumulate in the thread. Local codes vary but 18" depth is common for piping inside a yard and not in a right-of-way. Remember to dig with caution - there are other lines underground. Safest thing to do is hire a plumber. Working with gas piping is not for amateurs.
Get rid of the entire copper pipe and fit 3/4 PEX from the street main into the house. Cheap and reliable.
Coated Copper Pipe that is approved for underground only.
Pex, a flexible potable waterpipe is the preferred. You can use PVC that is potable and copper that has been sleeved. No joints of any kind should be used on underground portions of the piping. That is why pex is preferred as it comes in various sizes and lengths in rolls.
With a PVC locator
IT IS THE MOST USED ON UNDERGROUNG PIPE WORK
ya the galvanized pipecan be use in undergrounds,,, because it is an iron pipe
Orange pipe is for natural gas.
Underground I use K copper exclusively..
Pipe sealant that is often used as a boiler repair by Hercules chemical corp
You should use black pipe -- Galv. pipe will flake off inside of pipe
Termites
No