Decanter rag layer detection
Decanter rag layer detection
(OP)
Assuming that a sight glass can't be used, does anyone have any good suggestions as to how to detect a rag layer in a continuous decanter?
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Decanter rag layer detection
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RE: Decanter rag layer detection
m777182
RE: Decanter rag layer detection
Back in the 80's we looked at static pressure, ultrasonics, conductivity, etc - but we never found anything truly reliable. We even built calibrated floats that were supposed to float between the two layers, but the densities of the layers were too close and varied too much.
I really hope the instrument guys have made some progress on this one - they have done some amazing things in other fields. The biggest changes in process engineering during the time I have been involved have been in the area of control.
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Decanter rag layer detection
Aquasant makes a product that may work.
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More suppliers are Ohmart, Endress+Hauser, Thermomeasuretech, Ronan.
Try searching the site before posting questions:
http://www.eng-tips.com/viewthread.cfm?qid=143895
RE: Decanter rag layer detection
RE: Decanter rag layer detection
The latest ones we used where from Ktek
RE: Decanter rag layer detection
Some very valuable advice above. I would make one comment that dont rule out sight glasses we have full length sgs on coalessor/seperators - we do see a rag layer and purge off as required.
Now it all depends on MAWP limits, risks, materials .. if this is acceptable - always use a guard on your sight glasses scafolders have a difficult job and these are easy to hit.
I have worked on a plant that only use video cameras and sight glasses to measure interface but that was an old plant.
Depending on vessel size/ fluid density someone like tru-tech offer scanning services which can be effective. Not i've tried this on brick linings and it doesnt work for IF level.
hope this helps
james
RE: Decanter rag layer detection
One suggestion that I hve received elsewhere is to simply pump out the the rag layer periodically (once per day?) and recycle it through a filter (cartridge?) back into the feed to the decanter, thereby removing the rag layer. This is likely the way we will go as the the feed is fairly clean, and the rag layer should build quite slowly.
RE: Decanter rag layer detection
More information is available at www.scanningtech.com
Good Luck