We have about one hundred and forty feet of distance between access holes into the sewer line. Somewhere in there the line has frozen shut and we are currently trying to thaw it out. We are using a home made steamer that is sort of working but we are looking for better results. Any ideas would be helpful. also does anyone know if there is pipe out there with built in heat tape or something of that sort.
Are you able to pump in large quantities of steam, working from the low side (the outlet side) that the water condensed (the condensate) from the steam doesn't interfere with the steam's hitting the obstruction?
From the high side you would want to poke down a hose all the way to the obstruction to express the steam down there to heat up any accumulated water (including condensate) as opposed to being blocked from the area of the obstruction by accumulated water.
Actually they do make pipe with a built in heating cable, for such purposes as temporary over the ground water mains. You can see a "spiral molded into the pipe surface". This is not a do it yourself project.
When cleaning anything including baby diapers, it is better to sweep off or scrape off as much solid and semisolid material as you can first. (1) Less cleaning fluid or detergent needs to be used, (2) Less of a mushy mess which in turn means that bleaches or disinfectants will be more effective.