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Even though the orifice plate has a disadvantage of permitting a greater pressure loss than other differential pressure type flow meter such as flow nozzle and venturi tube, etc., the orifice plate is popularly used for flow measurement due to high reliability, low cost, easy manufacturing and simple shape.
As for bore type of orifice plate, there are Concentric, Eccentric, Segmental and Quadrant Edged types, and sizing calculation and design for the orifice plate are based on the standard codes of ISO-5167, ASME MFC-3M within a tolerance in compliance with these ISO & ASME Standards.