Design against corrosion
Design against corrosion
(OP)
Can anybody tell me where in ASME Section VIII, Div I, are guidelines or recommendations given to prevent crevise corrosion (especially inside vessels)?
Thanks,
Thanks,
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RE: Design against corrosion
There are no such guidelines or recommendations for preventation of crevice corrosion in ASME Section VIII, Div 1. This is a design detail that must be considered by the Design Engineer (or firm) working with a Materials Engineer.
RE: Design against corrosion
RE: Design against corrosion
NACE should give you help
ASME is mechanical code, not corrosion
RE: Design against corrosion
Vessels are already built!!!
RE: Design against corrosion
If you are looking for help, please come back with specific questions, particularly if the equipment has already been built. As kindly mentioned above, other standards and codes are applicable to your problem, usually listed in the design specification provided by the Client to the fabricator.
Cheers,
gr2vessels
RE: Design against corrosion
RE: Design against corrosion
In this particular case (service), during upset conditions the normal iron oxide protective layer (tower is SA-516 Gr 70 PWHT) is destroyed and gets into the crevices, I think right term is under-deposit corrosion.Before you ask, I'll tell you that we do have oxygen in the system everytime we add "make up solvent".
Going bact to what metengr wrote, ASME Section 8 Div 1 Appex E gives some guidelines but this appex is NON-MANDATORY.
RE: Design against corrosion
Hire a professional who does Fitness-For-Service assessments.
http://
RE: Design against corrosion
1. Change the environment (prevent oxygen ingress if it is detrimental; inject chemicals)
2. Change the material
3. Isolate the material from the environment by coatings, claddings etc.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Design against corrosion
RE: Design against corrosion
you're always on the money!!!. I got process engineering already working on effects of oxygen scavengers in the process.
Can't change material. Tower is already built.
Our "in-house" spec calls for seal weld on all internal attachments that's the reason coating was not considered at first.
RE: Design against corrosion
Lack of seal welding on internal attachments...leaving crevices along the way!!
RE: Design against corrosion
There is in the codes provisions for corrosion allowance but does not address your problem.