So this is the pipe that is being used to replace the steel gas line that has been in the ground carrying gas to Sea Cliff homes since the 1950's. This bright yellow pipe is called "Medium-Density Polyethelene." it is widely used for natural gas and propane distribution, because it is flexible and corrision resistant. I wasn't able to see it being "welded" together for this project, but I saw a similar type of pipe being welded together for a sewer line on Shore Road 3 or 4 years ago. They carefully trim the ends of two pieces of pipe and then put both pieces in a "jig" and the two pieces are brought together and then surrounded by a device that I think uses ultrasonic waves to heat both pieces and when it is done the pipe joint is as strong as the original pipe
Here is an entire trailer full of long sections of the pipe. They are welded together above ground tha then the long sections are buried in the trenches in the street.
If you enlarge this, you can see that this kind of pipe is much thicker than a steel pipe would be. Aren't you so glad to learn all of this information about gas lines in the street?












