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Hi, Do you know if we can we install a impressed catholic protection system for the internal surface of 316 SS tank containing copper sulphate. Is there any limitation and did you already design or inspect Such system? If anyone have some good paper about this topic, it will be helpful for me...

So even with pH 6 the duplex 2205 will not handle it?

@EdStainless: according to the provided information, the pH varies over a fairly wide range (4 to 7), I am not sure if it will be really 4 or less acid. Do you have any feed back about pH from organic waste treatment plants (organic waste pulp)? can we really expect a pH of 4.

@ EdStainless: we expect 65°C, pH between 4 to 7 and 1100 mg/L of chloride.

@ Dhurjati Sen, thank you interesting thread. What about the alloy 20? do you have any reference showing his chloride limits according to temperature?

For an organic waste pulp pipes a temperature of 65°C and a chloride concentration around 1100 ppm is alloy 20 a good choice? If there is any reference showing the chloride limits according to temperature? My first choice is the duplex 2205 and according to the supplier the Alloy 20 can be...

For an organic waste pulp storage tank with a temperature of 65°C and a chloride concentration around 250 ppm is SS-316 a good choice. I think that duplex 2205 is more suitable but but my client is convinced that using SS316 is sufficient.

What is the difference in price between the 2205 and the 254? @ weldstan: definitely I agree with you @ TugboatEng: I think "97522 CORROSION FAILURES IN PLATE HEAT EXCHANGERS (NACE paper)" is interesting we can found some case histories about plate heat exchanger

thank you Guys for your answers, you are confirming my point of view. But during my discussion with my customer I explained that 3000 ppm of chloride is high for SS316 but according to his information, the waste water plant from where this liquid is coming are using SS316 without issues. This...

Hi, I am working on a project, the situation is: water coming from a wastewater treatment plant with chloride levels between 200 and 500ppm for most of the year, but for 3 weeks, the chloride level reacheas a maximum of 3000 ppm because of de-icing salt melting (according the informations that...