Stainless Duplex to carbon steel
Stainless Duplex to carbon steel
(OP)
Trying to evaluate the possibility of joining these two materials in a pressure boiler. Looking for some pre-liminary feedback.
Are either of these combinations practical? If so, what are their limitations?
*SA-178A tube (or return bend) to SA-789-2205 tube.
*SA-789-2205 tube to SA-106B header.
Thank you in advance
Are either of these combinations practical? If so, what are their limitations?
*SA-178A tube (or return bend) to SA-789-2205 tube.
*SA-789-2205 tube to SA-106B header.
Thank you in advance





RE: Stainless Duplex to carbon steel
RE: Stainless Duplex to carbon steel
To get around the stress relieving, we are thinking of putting stubs on the header, stress the assembly and weld the 2205 to the stub. 178a ~ 2205.
RE: Stainless Duplex to carbon steel
Just because a material is listed in SecII doesn't mean that its use is allowed in SecI.
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Plymouth Tube
RE: Stainless Duplex to carbon steel
RE: Stainless Duplex to carbon steel
RE: Stainless Duplex to carbon steel
My department is insisting this combination duplex to cs is acceptable in section 1 fabrication up to 600f. Looking for opionions of code enterpretation and practicality of the application. I agree, simply because it is acknowledged in section 11 does not mean it is automaticly accepted in section 1. Would like to raise the flag but want to be right before raising a stink.
RE: Stainless Duplex to carbon steel
RE: Stainless Duplex to carbon steel
RE: Stainless Duplex to carbon steel
RE: Stainless Duplex to carbon steel
Just to clarify and thanks for the additional information, PG-9.7 is for unfired components that could fall under the Jurisdiction of Section I. If this economizer can be isolated, this material cannot be used under Section I.
Now, something to think about, should there be any operational event that results in this tube/header material reaching 600 deg F or higher (lack of flow or inadequate flow of feedwater), you can have a most serious problem with loss of toughness in this material. This is the designer's responsibility to consider.
RE: Stainless Duplex to carbon steel