H2S Corrosion-proof controllers
H2S Corrosion-proof controllers
(OP)
I've got a pump station with excessive corrosion in the PLC due to excessive H2S levels that really can't be mitigated at this point. Does anyone have suggestions for a controller brand that handles these conditions better? Or maybe some sort of other idea on how to keep the H2S at bay and out of the box? Thanks.





RE: H2S Corrosion-proof controllers
RE: H2S Corrosion-proof controllers
Lift station areas are generally defined as a Hazardous Class 1, Div. 2 Classification areas.
http://www.bebcoeps.com/typez.jsp
Do yourself a favor and save money/headaches in the long run. Fit a purge kit on either the existing panel that houses the controller or install the controller in a purged enclosure. Allowing corrosive air into such a panel is not a good idea no matter.
It is also possible to an inert gas instead of air, but the inert gas carries with it further hazards.
http://www.google.com/url?sa=t&rct=j&q=&am...
RE: H2S Corrosion-proof controllers
RE: H2S Corrosion-proof controllers
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: H2S Corrosion-proof controllers
http://www.wastechengineering.com/products/explosi...
http://www.wastech.com/pages/explosion-proof
http://www.tpcusa.com/
The only O & M for these devices is to make sure that the device is working.
An encapsulated board will work for the controller, but if you have H2S exposure, then everything else in the control panel will suffer from corrosion as well.
RE: H2S Corrosion-proof controllers
RE: H2S Corrosion-proof controllers
You may consider adding nitrate compounds into the feed lift stations. This method has proven to be successfull in minimizing hydrogen sulfide in similar installations when repumping from force mains.
http://www.webpages.uidaho.edu/ce432/h2s-newea.pdf
http://www.webpages.uidaho.edu/ce432/WET-CaNO3-Feb...
http://www.h2o2.com/products-and-services/us-perox...
RE: H2S Corrosion-proof controllers
RE: H2S Corrosion-proof controllers