Method of measurement of Blind Flange

　　1.First, respectively, accurately measure the flange diameter D1.D2 size, such as the measured data is 157.5mm this size is 157.5mm.

　　2.ANSI B16.5 Calss 150-900 Forged Blind Flange clearance b size, in the circumference measured four points (uniform).

　　3. Measure the depth C (the size between the outside of the flange and the bolt) to measure the size of C at the 1234 position of the flange, and select the smallest size.

　　4. Measure the size of the two profiled flanges that are not concentric (misaligned), and select the size of the two ribs.

　　5. Finally, the measured data can be filled in the table on it.