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Ansi 150 is a pressure grade of flange ie. Ansi #150 Flange. For steel flanges this is specified by ANSI B16.5.
Yes, if you have an ANSI C++ compiler. Most modern compilers are ANSI, and are capable of suppressing non-ANSI code, using a compiler option.
Is B18.6.3-UNC 8-32 a substitute for ASTM A194
ANSI stands for "American National Standars Institute"
Aswad Ansi was beheaded by Fairuz Ad-Delami