what is the cost of install a 86' long, 8" steel pipe? The cost should include trench diging fee(3 feet deep), labor fee, equipment rental fee, cost of purchasing pipe.
The cost for installing sewer pipe are highly dependent on the location. Not sure if anybody is using steel for sewer pipe. PVC or ductile iron are probably more common. 8-Inch sewer pipe installed typically runs $75 to 100 per foot.
Here's an online estimate that shows you how to do an estimate: