[camyot]

Thank you for the reply.

I am more concerned with wether or not that C-factor of 150 will stay the same over the service length of the pipe.

Will the C-factor still be 150 after 35 plus years of service?

Or will it degrad to a lower value, and if so by what degree?

Is there anyone has gone back and done a C-factor test on a HDPE pipe that has been in service for a significant amount of time?