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As I told earlier that we generally use SA-193 B7 in carbon steel vessels due to several reason one of which is cost as well. So far if we use any other material then we need to ensure compatibility of that bolt material with vessel. And as a mechanical perspective we can't fix this. That's why...

Generally, bolt material of flanges in vessels & Heat Exchangers under 4-inch size are not meeting the minimum allowable stress limit as specified in UG-44b, ASME Sec. VIII, Div.1. So far what options are available for fixing it. While bolt materials generally have an issue SA-193 Gr. B7 and...