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Foaming in degreasing bath in PT line

We are facing problem of excessive foaming in the degreasing bath of capacity 8.8 kl.the concentration of cleaner is only 1% v/v.The reduction in spray pressure in the bath has also not yield any result. Use of antifoaming additives yield only a temporary reduction in the foam but foaming starts thereafter. how can the foaming be reduced?


Regards
R.Girish

R.Girish
Pretreatment Line - Hosur, India
2005

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2005

Mr Girish,
All you have told the readers is you have 8.8 thousand liters of some unknown material at 1% w/v in some unknown liquid with some unknown amount of an unknown antifoamer cleaning some unknown material by some unknown method (probably Spray) with an unknown temperature and pressure and distance and spray angle.
With the above in mind, do you really expect some mind reader to help? The quality of the response is limited directly by the quality of the question.

James Watts
- Navarre, Florida

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2005

Dear Girish,

You have not any unusual problem, it is simply because of wrong selection of degreasing chemical or wetting agent.
Your problem can be solved by using solvent base formulation in place of any alkaline one.However some formulations are also available in alkaline type also using non-foaming type wetting/detergent.

Navin Maheshwari
- New Delhi, India

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If I were you I would bring the concentration up to 2.5% and make sure the bath temp is at least 110-120 degrees, the pressure should run around 15 psi. If that doesn't work it's probable that the bath is "spent" and needs to be dumped and recharged, but like the first responder said, it's only a guess.

Sheldon Taylor
supply chain electronics
Wake Forest, North Carolina
2005

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July 23, 2008

what is the mixture or oxalic acid for pickling stainless steel pipe that is in place?

or is hydrofluoric and nitric better.
for pickling and the mixture?

thanks

david l prater
piping superintendant - windfield,wv usa