scope:

General

This Standard covers flanges (similar to those covered in ASME B16.5) that have orifice pressure diffential connections. Coverage is limited to the following:

(a) welding neck flanges Classes 300, 400, 600, 900, 1500, and 2500

(b) slip-on and threaded Class 300

References

Referenced Standards. Standards and specifications adopted by reference in this Standard are shown in Annex B, which is part of this Standard. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead, the specific edition reference is identified in Annex B. A flange manufactured in accordance with earlier editions of the referenced standards and in all other respects conforming to this Standard will be considered to be in accordance with this Standard.

Codes and Regulations. A flange used under the jurisdiction of the ASME Boiler and Pressure Vessel Code, the ASME Code for Pressure Piping, or a governmental regulation is subject to any limitation of that Code or regulation. This includes any maximum temperature limitation, or rules governing the use of a material at low temperature, or provisions for operation at pressure exceeding the pressure-temperature ratings in this Standard.

Content

The requirements of this Standard include:

(a) pressure ratings

(b) marking

(c) materials

(d) dimensions

(e) tolerances

Quality Systems

Non-mandatory requirements relating to the product manufacturer's Quality System Program are described in Annex A.