ClSCC in a hospital steam sterilizer with tap water
ClSCC in a hospital steam sterilizer with tap water
(OP)
Can Chloride stress corrosion cracking (ClSCC) occur in a hospital steam sterilizer with tap water. The steam sterilizer is made of 304 grade stanless steel. Thanks in advance.
Operating temperature is 126 ºC
Operating pressure is 1.4 MPa
Operating temperature is 126 ºC
Operating pressure is 1.4 MPa





RE: ClSCC in a hospital steam sterilizer with tap water
RE: ClSCC in a hospital steam sterilizer with tap water
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
RE: ClSCC in a hospital steam sterilizer with tap water
Your problem can be quite hard to work around. The best option is to work with the equipment vendors making sure you give them the expected chemistry of your feed water. I've seen some of this type apparatus that had copper alloys or glass in the steam generator with the remaining parts being 316SS. I'm quite sure with some of the latest alloys there is a better solution.
RE: ClSCC in a hospital steam sterilizer with tap water
S
Corrosion & Rust Prevention Control
RE: ClSCC in a hospital steam sterilizer with tap water
I have failed parts with less than 100ppm Cl.
You need to look at a higher alloy stainless.
316 is really no different from 304 in terms of SCC.
My first suggestion would be 2205.
As a duplex it has good SCC resistance.
The other tip, make the parts as thin as you can. If these are coils then cut the wall thickness to the absolute minimum. You would rather have a little distortion than allow the stresses to build until they force something to fail.
I have also see SEA-CURE superferritic stainless used for coils in these units. It wont crack but it costs more and is more difficult to work with.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube