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I am working on a single family residence that has a 4" ductile service line (yes that is four inch) which is about 270 feet long. The middle section of the pipe was installed at a depth of about 6' (9' is minimum in this area) due to a rock ledge which was encountered. I believe the line is insulated with 4" blue board and shares a trench, and insulation with the sewer line.
The main froze this winter due to a lower than usual snow pack and the house being occupied part time.The blockage was about 80 feet long. I don't believe it has frozen in the past 17 years with the original owner.
I am looking for solutions. The obvious first choice would be to dig up the pipe (under the driveway) and reinsulate with spray foam, possible instal heat trace.
Other thoughts would be an "internal" solution. Has anyone used an internal heat trace or recirc tube. The access to the end of the main is quite good. It is part of a municipal system. I am sure there will be concerns about potential contamination that will need to be addressed.
Thank you in advance,
"If you can't explain it simply, you don't understand it well enough"