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or as per @Christine bolt materials are low alloys and not CS so there is no chance for contamination regardless of using SA 192 B7 or SA 193 B8 Cl2

The vessel service is Caustic, temp is 100C and pressure is 150 psig. So far taking ASME VIII Div I UG 44 into consideration I have decided to use SA 193 B8 CL2 bolt material which is SS. Although, I do wonder, doesn't CS material cause contamination in SS material? I mean when we manufacture...

The CS vessel i am designing has an SS stack on it. There are two flanges joining the stack to the vessel, one flange is CS (attached to vessel) and the other is SS (attached to stack). Now I am confused that at this junction which bolt material should I choose; CS or SS?

I am designing a pressure vessel and applying loadings on flanges as per UG 44 is raising the issue of "The bolt material shall have an allowable stress equal to or greater than SA-193 B8 Cl. 2 at the specified bolt size and temperature." in COMPRESS, so now I have few questions: i) Is there a...