We are designing a waste water disposal system. High Cl (32,000ppm), High TDS and operating temperature (100 degree C). What exchanger materials would you suggest? Waste water is on the tubeside.
The ferric chloride solution used in G48 C and D is 33,000ppm Cl and a pH of <0.5.
There are very few (very expensive) metals that will work at 100C in this.
Now if the pH were near neutral then superaustenitic, superferritic and superduplex grades might all become candidates.
If the pH is high then a superferritic would be the clear favorite.
the temperature is quite high, if there is no oxygen i'll select a superduplex and i'll also look for a good external coating to avoid any possibility to have external corrosion.