6M Guanidine HCl

[guano]

I would like some MOC recommendations for a mixing vessel used for 6M Guanidine HCl. This is a sanitary/hygienic vessel that will be designed to ASME BPE-2002 standards (Bioprocess equipment).
I have heard that 316L SS is not recommended because pitting will occur. I have also seen that one thread mentioned AL6XN. I checked into this and the cost is about a 70% increase over 316L SS.
Plastic is a possibility but may times plastic tanks are not designed to the BPE standard.
Would 904L SS be an option? How would the cost compare to 316L SS?

 

[cramg]

Dear Guano,

I've just been faced with the same question. Did you ever get a useful answer to your posting?

Geoff Cram
Engineer

 

[metengr]

guano;
I have dealt with Trent Tube (web site

http://www.trent-tube.com)

and they have an excellent pdf file listing a wide selection of alloys and their corrosion resistance in various environments. On several occasions, I have called them for pricing on heat exchanger materials.

According to their literature, 316L ss is NOT acceptable, the AL6XN and 904L would be "acceptable" in concentrated HCL. I would call them to get pricing.