Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
(OP)
Hi Everyone,
As the thread subject says, I'm hoping to get some recommendations for a coating to coat a concrete force main and protect it from H2S gas produced by bacteria in the sewage. I expect H2S gas levels of around 400 ppm Past experiences/stories would be appreciated and names of coating manufacturers as well as coating types would be appreciated as well.
Thanks in advance,
As the thread subject says, I'm hoping to get some recommendations for a coating to coat a concrete force main and protect it from H2S gas produced by bacteria in the sewage. I expect H2S gas levels of around 400 ppm Past experiences/stories would be appreciated and names of coating manufacturers as well as coating types would be appreciated as well.
Thanks in advance,





RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Pipe is rather large, 900 mm. Not many bends. It would be a new install.
Going through a brain storm session on this project at the moment. I arbitrarily picked that ppm, but I'd like for it to sustain that based on some things that I am reading. Another thing I worry about is it may sit not completely full. I've read in the past that H2S will come out of the water solution and form H2S04 in the head space above the fluid. That may chew up the coating heavily no?
Anyone have experience with the above?
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
http://www.hobaspipe.com/case-histories/wwtp/illin...
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
If so, could you recommend some pipe lining products for me to look into? Something odd to me about a force main with empty head space being OK as a design.
Should I simply be suggesting that we ensure it is always full instead of trying to find a coating that will likely fail anyway?
Thanks in advance,
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
as recommended above, linings are superior to coatings. but non-corrodible pipes are even better
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
As it appears you are now delving into issues of basic system design, you also may be interested in perspectives contained in past discussions of perhaps similar challenges e.g. http://www.eng-tips.com/viewthread.cfm?qid=194951 and http://www.eng-tips.com/viewthread.cfm?qid=24447 etc.
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
If you paint two times.. (two separate layers) and paint over the holidays, would you not have a good enough coating and be as good as a PVC liner for example?
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Is there a rule of thumb as to what thickness constitutes a liner? I have here in my specs a '20 mill' coating. Seems somewhat thick to me.. hence the confusion.
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Imagine if you tried to clean a forcemain with 20 mil liner? The liner would probably be ripped off the wall.
See the attachment, page 5.
https://www3.epa.gov/npdes/pubs/force_main_sewers....
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Thanks everyone for your kind replies. This website is truly a gem!
RE: Recommendation for Coating to Protect Concrete Force Main from H2S Corrosion
Richard A. Cornelius, P.E.
WWW.amlinereast.com