Gas What materials are used for gas piping?

expert EXPERT April 26, 2007

The most common gas piping is black steel. Copper, brass or steel tubing can also be used in some areas but some utilities specifically prohibit the use of copper. In other areas, the use of copper is widespread. You should know what is acceptable in your Steel piping is typically black with malleable iron or steel fittings.

Copper tubing used above ground has to be type K or L (these are heavier wall than typical plumbing pipe) or type GP. Underground copper tubing must be type K. In some areas, type L tubing can be used underground if it's been coated with PVC during the manufacturing process.

Outdoor underground piping can be plastic, but since we won't often see this we'll talk more about the indoor piping. Plastic piping used outside underground should have a metal riser or chase coming up above grade to protect the piping. You shouldn't see any plastic piping above grade. Metal tracing wires are often wrapped around buried plastic pipe, so it's easier to find.

Steel piping used underground should be protected with a rust inhibiting coating. Again, we won't worry much about this since we won't often be able to see it.