ANSI Class 150 establishes the measurement of pipe size. The 150 category of the American National Standards Institute (ANSI) is the size standard system for welded necks, threads, sockets, laps, socket welding and blind flanges. The dimensions of panels, bolts and studs are also included in ANSI Class 150.

ANSI Class 150 establishes measures for pipe sizes. The American National Standards Institute (ANSI) Class 150 is a system of dimensional standards for weld neck, threaded, slip-on, lap joint, socket weld and blind flanges. Dimensions for facing, bolts and studs are also included in ANSI Class 150.

The following are several important differences that distinguish the two: ANSI has established and recognized the performance and quality standards of products and services in many industries, while ASME is mainly dedicated to boilers and pressure vessels

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