Introduction to API Specification 6A - The OFMP

api 5000Beware, some suppliers and manufacturers supply normal A105N 36K material flanges stamped as 3,000 or 5,000, these interconnect with API sizes (example a 2 ANSI A105 1500 class flange rated at 3,700 psi CWP is the same asAPI 6A - Type - 6B 34.5 MPA (5000 psi) API 6A - Type - 6BX 13.8 MPA (2000 psi)