Greetings,

I am a little perplexed by the following sentence found in ASME B31.3 Appendix S, Clause S301.2 (p.434 of B31.3-2014):

"For example, ASME B16.5 requires a minimum of Class 300 for ASTM A105 flanges."

I have attempted a glance through ASME B16.5-2013 but could not find any reference to such a limit.

Can anyone shed some light on this?

Thanks.