Certified standards of ANSI flanges provide a wide variety of flanges with dimensions ranging from ½” (inches) through 24” (inches). The Specifications for ANSI flanges is B16.5. Some ANSI flanges have: flat faces, raised faces, tongue and grooves, ring joints, male faces and female faces.
The types of ANSI flanges are: slip on flange, welding neck flange, lap joint flange, plate flange, threaded flange on forge steel, carbon steel, stainless steel, alloy steel and blind flange. The classes of the flanges are the pressure ratings, which is between Class 150 and Class 2500. The dimensions of the flange are determined by the size of the pipe and the class of the pressure, which are required for the flange to be able to withstand water pressure and heat. Temperatures and materials of the flange can withstand pressures from -20 (degrees, Celsius) to 200 (degrees, Celsius).
The systems of ANSI flanges include: two flanges, a sealing, ring and bolt fasteners to put enough pressure on the seal that is lying in between the flanges. In order for a sealing ring to be accepted, two ANSI flanges must have a grooved flange, where the seal is created.
The classes for flat face flanges are Class 125 and Class 250. The classes for ring joint flanges, tongue and groove flanges and raised flanges are: Class 150, Class 300 (Class 400 – rarely), Class 600, Class 900, Class 1500 and Class 2500. ANSI flanges are divided into classes, depending on pressure, temperature and the type of material used.
Charts for ANSI flange Specifications indicate: The class of the flange, the size of the pipe (in inches), the number of bolts, the flanges diameter (in inches), the diameter of the bolts, the diameter of the hole – the bolts are placed into and the measurement of the bolts circle (in inches).
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