carbon steel versus ductile iron
carbon steel versus ductile iron
(OP)
Have a petroleum waste water stream going into an existing treatment plant we are upgrading. All old below grade and exposed pipe is listed as ductile iron on old plans (late 60s, early to mid 70s). We will be replacing some pipe, and tieing into others. Some lines will be gravity, some are forced. Design life 30 years. Can someone give me a quick primer (or point me to one) on the use of each of these materials in ww jobs. What types of joints are best for below grade matches to the existing ductile. Thanks to the folks who can help!





RE: carbon steel versus ductile iron
RE: carbon steel versus ductile iron
http://www.acipco.com/adip/index.cfm
RE: carbon steel versus ductile iron
RE: carbon steel versus ductile iron
RE: carbon steel versus ductile iron
I would not want to be on TV news, identified as the spokesman for a company that contaminated the acquifer supplying the town's drinking water. I suspect this motivates the PR and environmental people, too.
RE: carbon steel versus ductile iron
I guess I have to agree, however, that if “very bad chemicals” are involved, very good shop and field quality control and testing and maybe even “double-containment” (along perhaps with leak warning systems?) may not be a bad idea with whatever piping materials are employed!
RE: carbon steel versus ductile iron
RE: carbon steel versus ductile iron
Yes, they do have leak detection system if it is double contained. Sometimes a membrane is also placed under the secondary containment. Belt and two pairs of suspenders. Thrust blocks and spread footings are placed along the line. The welds are 100% inspected and made to qualified procedures by qualified welders.
Since these are pipelines of concern, extra measures are taken compacting the soil to avoid settlement. True enough, SS is not perfect in its resistance to corrosion. Anything too agressive for plain 304SS is typically not direct-buried at all.