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topic 32663

Passivation of a pharmaceuticals production line


We are a pharmaceutical company and we are going to run our new Haemodialysis Solution Plant and have a problem with passivation of the line (Nickel Chrome Tanks, GOAVEC + Titanium Pumps, GRUNDFOS + Stainless steal Pipes ) . The line keeps filled with water for about 10 months. The parts have started to show surface discolouration .

I have heard/read that the line can become passive if it is rinsed with 2% Caustic Soda then 1.5 % Nitric acid in water at room temperature? If it is, What temperature rinse would be optimum ?

Can nitric-acid passivation process make our line as corrosion resistant as S.S.316?

What are other possible passivation ? I need to know different methods

Is it like passivation of S/S ?

Why/when is it done?

How is it done?

Any references to standards, articles or published material would be greatly appreciated.

Finally, is there any recommended cleaning fluids? We would appreciate any advice on this matter.

Wael Ebied
Fresenius Medical Care - 10 th of Ramadan , Cairo, Egypt

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