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Propylene Glycol Cooling Water For Closed Loop Systems

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#1 J_Leo


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Posted 10 January 2023 - 12:36 PM

Hi Folks,


We have closed loop glycol cooling water inside the air compressor packages by Atlas Copco. Currently, we have 25wt% glycol water in the systems. 

It was made by mixing inhibited glycol water (PS55 by Parker) and utility water. Due to increased iron level (up to 50 ppm), we plan to flush the systems and replace it with new glycol water. Surprisingly, per lab analysis by ChemTreat, no corrosion inhibitor was in the samples. The 55 gallon drum costs more than $3200. I checked Parker website and didn't find much more information than the SDS.


I need your help:

Can we just buy regular glycol and mix in corrosion inhibitor? Is microbiological inhibitor needed?

Can you please provide some reliable propylene glycol manufacturers that I can get some quotes?




#2 Pilesar


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Posted 10 January 2023 - 01:53 PM

No matter what answer you get in this forum, I suggest discussing your unsatisfactory experience with engineers at Parker Hannifin and Atlas Copco and asking their advice.

#3 breizh


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Posted 10 January 2023 - 07:13 PM


Totally agree with Pilesar , you need to go back to the water treatment supplier to discuss the matter, they are responsible for the molecules and quality of the treatment.


#4 J_Leo


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Posted 11 January 2023 - 04:22 PM

Thanks. I have sent our emails to these two parties and other suppliers. Hopefully, I can get to the bottom of it.

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