life expectancy of steel casing pipe
life expectancy of steel casing pipe
(OP)
I have a boring and jacking project in Phoenix, Arizona. Client is concerned about the life expectancy of the 48" diameter steel casing pipe. We are proposing to use the casing pipe as a storm drain without a carrier pipe. The City is requesting a life expectancy of 75 years. Field resistivity of the soil is 4711 (ohm/cm). Will a 1/2" thick casing pipe be thick enough?





RE: life expectancy of steel casing pipe
RE: life expectancy of steel casing pipe
Jacking and boring is the process for installing this underground line. A tunnel is bored with an auger and then a hydraulic jack pushes the pipe in the tunnel. The inside could be coated with coal tar or epoxy. The outside could be coated, but the coating would probably be damaged during the jacking process. We don't envision using any cathodic protection.
RE: life expectancy of steel casing pipe
How long is this pipe and what is the dia.?
RE: life expectancy of steel casing pipe
We have 12 gage corrugated steel culverts here that are designed to last 75 years. Granted, they are usually galvanized. But still, one scratch through the galvanizing and they would begin corroding.
My thought is that you could install it and inspect periodically to check for corrosion. If corrosion is progressing, then either slipline it or provide cathodic protection. Otherwise, just leave it alone and continue to monitor.
RE: life expectancy of steel casing pipe
Comments from others regarding MIC are correct, particularly on the water immersion side. Also, be careful about using soil resistivity alone for estimating corrosiveness of soil. The mean of the corrosion rate data follows changes in soil resistivity nicely, but once again, the standard deviation of the data is huge.
RE: life expectancy of steel casing pipe
RE: life expectancy of steel casing pipe