What are the disadvantages of duplex ss.
What are the disadvantages of duplex ss.
(OP)
Dear sir,
I have some project to change tube material of exchanger from cabon steel to duplex ss.
Anyone can tell me? What are the disadvantages of duplex ss.
Best regards,
SK
I have some project to change tube material of exchanger from cabon steel to duplex ss.
Anyone can tell me? What are the disadvantages of duplex ss.
Best regards,
SK





RE: What are the disadvantages of duplex ss.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: What are the disadvantages of duplex ss.
They can be susceptible to chloride stress corrosion cracking, but they are somewhat resistant.
If you are putting them into CS tubesheets or mating to other CS components the CS may see greatly accelerated local galvanic corrosion effects.
The duplex also has slightly greater thermal expansion than CS. It also has lower Thermal conductivity, but that is more than made up for by the thinner walls.
Remember to not use a corrosion allowance, and calculate the thickness using the properties of the duplex. Depending on the application your thickness will drop by 30-60%. Use the calculated thickness.
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P.E. Metallurgy, Plymouth Tube
RE: What are the disadvantages of duplex ss.
EdStainless has covered all the major limitations.....
You must tell us more about your existing HX and it's duty...
What are the operating fluids, Max T and P ?
Erosive fluids ? Particles ? Chlorides ? if so, what is the ph and ppm of the chlorides ?
A drawing of the HX would be nice.......
MJCronin
Sr. Process Engineer