American Standard Valve Flange and Flange Pipe Fitting Standard

American Standard Pipe Flange and Flange Pipe Fitting Standards The American Standard pipe flanges and flange pipe fitting standards listed in this book are the 2009 edition. This is the most significant revision of the standard. ASME B16.5 was upgraded in 2003, which is quite different from the previous version of the valve standard. It takes the metric unit as the main reference unit, while keeping the American customary units in brackets or in a single column. The purpose is to delete American customary units when the next version of the standard is issued.


This standard uses the latest version of the ASME Boiler and Pressure Vessel Code Volume II Part D data to recalculate all pressure-temperature ratings. Certain materials have been juxtaposed from one group to another, and new material groups have been added. At the same time, the flange thickness identification of the 150-pound and 300-pound flanges, the sealing surface of the end flange and the relationship between them and the flange thickness and the center-to-end and end-to-end dimensions are revised.



The reference plane of flange thickness dimension is modified. But the flange thickness remains the same. The minimum flange thickness identification has been changed from C to t f, t f does not include the 2.0 (0.06 in) raised face of the 150-pound and 300-pound raised face flanges and flange pipe fittings.


In addition, the grade neck welding flange is incorporated as a new family of flanges of 150 to 2500 pounds. This standard was approved by the American Standards Committee and ASME Valves and was released on July 9, 2003. This chapter only lists the commonly used flange standards for 150-2500 pounds (Figure 1-17, Table 1-107 ~ Table 1-113).