Sfmax Governing Bolt Stress

Flanges yielding before the gasket is properly sealed? 

That is what you are risking when you allow Sfmax to govern the Selected Assembly Bolt Stress, Sbsel inside of the ASME PCC-1 Appendix O calculation. Please reconsider flange selection if the Maximum Permissible Bolt Stress before Flange Damage, Sfmax is limiting the bolt torque applied to the bolted flange joint assembly

It is important to understand the seven load combinations included in the WRC 538 analysis. That is why Metalmark Engineering created this flange diagram to help visualize what each of the seven flange load combinations are checking for. I find it to be helpful when trying to investigate which load(s) is governing the Maximum Permissible Bolt Stress before Flange Damage, Sfmax. 

The Maximum Permissible Bolt Stress before Flange Damage, Sfmax governs the bolt stress applied to the bolted flange joint assembly for many Class 150 and Class 300 standard ASME B16.5/16.47 flanges. 𝐏𝐥𝐞𝐚𝐬𝐞 𝐝𝐨 𝐧𝐨𝐭 𝐨𝐯𝐞𝐫𝐥𝐨𝐨𝐤 𝐭𝐡𝐞 𝐒𝐟𝐦𝐚𝐱 𝐜𝐚𝐥𝐜𝐮𝐥𝐚𝐭𝐢𝐨𝐧 𝐟𝐨𝐫 ASME standard 𝐟𝐥𝐚𝐧𝐠𝐞𝐬.