Step 3 - Gas Line Replacement

One of the problems with an older house is that often the utility lines are old and need to be replaced. They are also sometimes in the wrong location. This was the case with our gas, sewer, water, and electrical lines. Often these lines are cast iron pipe which deteriorates over time.

Our gas line was both old and in the wrong place. It was located right underneath the carport, which is bad if you ever need to work on it. All utility lines should be out in the open where you can get to them. Aside from our gas line being old, it was wrapped with a tape that contained asbestos. Not good. In San Diego County, SDG&E does all gas line work including removal of the old asbestos wrapped pipe. You have to dig to expose the old line and then dig a new trench on your new alignment according to their specifications. It's important to work closely with the planner at SDG&E to make sure your new pipeline route is okay with them and to get all necessary inspections done in a timely manner.

When we had everything set, a crew came and completed the replacement in about 2 hours. We had to pay a fee to SDG&E for this work but it was worth it, especially getting rid of the old line. One thing that amazed me was that they weld the fitting for the new pipe onto the old pipe while it still contains gas. Apparently this is safe as long as gas is not leaking out into the air. The new pipeline is yellow plastic which is supposed to last longer than the old cast iron. In places where it is not feasible to remove the old cast iron line, the new line is sized to slide right inside it.