Why does PREN be greater than 32 for sea water?
Why does PREN be greater than 32 for sea water?
(OP)
I read the Q&A elsewhere - for seawater, PREN of stainless steels must be greater than 32.
I want to know why PREN must be greater than 32. Why 32?
Another question, how is the lifetime of 316L stainless steel piping in 40C, seawater cooling condenser tubing?
Thanks,
I want to know why PREN must be greater than 32. Why 32?
Another question, how is the lifetime of 316L stainless steel piping in 40C, seawater cooling condenser tubing?
Thanks,





RE: Why does PREN be greater than 32 for sea water?
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/
RE: Why does PREN be greater than 32 for sea water?
I am wondering why PREN must be greater than 32. Is PRE 32 special criteria for seawater?
Would you please let me know why PRE must be greater than 32 ?
Thanks
RE: Why does PREN be greater than 32 for sea water?
"I'm that dog who saw a rainbow, only none of the other dogs believed me." from "Kate and Leopold"
RE: Why does PREN be greater than 32 for sea water?
The guideline is based on lots of experience.
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: Why does PREN be greater than 32 for sea water?
If you put 316 into seawater that is stagnant and you allow a biofilm to form it will last some where in the range of days to weeks. If it is kept very clean, no film or silt, and the flow velocity is high then it will last for years. But one bad shutdown where someone forgets to flush the tubes with fresh water and leaves them with a little bit of seawater in them, and they will pit in just days.
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