water disposal system material selection

[Johnae]

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.

 

[EdStainless]

Any idea about pH or other impurities (Fe or Cu)?

We need more info.

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.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[Johnae]

Thanks Ed,

The pH is 12. How about 2205 DSS. Is it OK in this service?

 

[strider6]

if there is oxygen supeduplex in not suitable. with 33000 ppm Cl is like a seawater and superduplex can be used up to approx 30°C..

you can consider copper alloys..

Vitt



Corrosion & Rust Prevention Control

 

[Johnae]

But there is no oxygen...

 

[EdStainless]

Look at super-ferritic like SEA-CURE.
You might be able to use a super-duplex also (Zeron 100 or 2507).

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[cloa]

If there other oxidiers like Fe3+ or alternatively its reducing like acid then you don't need oxygen to have a corrosion problem.

 

[strider6]

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.

S

Corrosion & Rust Prevention Control