Lack of lubrication in deionised water.
Lack of lubrication in deionised water.
(OP)
I know from practical experience of mono pump rotors that DI and DM water is a poor lubricant, when compared with regular water. It also provides poor lubrication to mechanical seal faces, causing less than expected seal life.
I have searched all over the place for some science to back up these observations, however I cannot find an explanation of why this might be. Does anybody have any ideas? or point me in the direction of where I might find the information?
I have searched all over the place for some science to back up these observations, however I cannot find an explanation of why this might be. Does anybody have any ideas? or point me in the direction of where I might find the information?





RE: Lack of lubrication in deionised water.
I pressume that since one is dealing with boundary lubrication (adsorption, chemisorption, monomolecular layers, etc.), the viscosity is of less importance than, for example, the amount of dissolved oxygen in the demineralized, deionized water. Don't you think so ?
RE: Lack of lubrication in deionised water.
Mike Halloran
Pembroke Pines, FL, USA
RE: Lack of lubrication in deionised water.
RE: Lack of lubrication in deionised water.
I can see the how the metallics were worn away, however does the same thing happen to the carbon seal faces? If you consult a seal manufacturer they will recommend Antimony impregnated carbon for DI and DM duties. In theory however won't the Di water strip the antimony from the faces? from practical experience again, we found that antimony impregnated carbons lasted longer than the regular resin impregnated carbon. The resin impregnated carbons are good for strong acids and alkalis. Can anyone explain why the antimony impregnated carbon lasts longer than the resin impregnated faces?