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Max H3PO4 conc. in carbon steel pipe?

Max H3PO4 conc. in carbon steel pipe?

Max H3PO4 conc. in carbon steel pipe?

(OP)
I'm trying to find the maximum "healthy" concentration for phosphoric acid in carbon steel piping.  We're currently using a sodium phosphate/phosphoric acid mixture as an iron corrosion inhibitor in our cooling water system.  We currently dilute to 1ppm, but is there any industry experience with a safe high setpoint for phosphoric acid in carbon steel pipe?  

RE: Max H3PO4 conc. in carbon steel pipe?

dellsmit, Check Perry's Chem. Handbook, table 23-2, Ferrous Metals and Alloys, pp.:23-21. From what I see, I wouldn't use carbon steel.

saxon

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