ASME B16.36:2020 pdf download.Orifice Flanges.
ASME B16.36 covers pressure—temperature ratings, materials, dimensions, tolerances, testing, and making of flanges (similar to those covered in ASME B 16.5) that have orifice pressure differential 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
2 GENERAL
2.1 References
Codes, standards, and specifications containing provisions to the extent referenced herein constitute requirements of this Standard. These reference documents are listed in Mandatory Appendix II.
2.2 QuaLity Systems
Nonmandatory requirements relating to the product manufacturer’s Quality System Program are described in Nonmandatory Appendix A.
(20) 2.3 ReLevant Units
This Standard states values in both SI (Metric) and U.S. Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in inch units only. These systems of units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Except for diameter of bolts and flange bolt holes, combining values from the two systems constitutes nonconformance with the Standard. The main text of this Standard does not contain requirements expressed in SI units for Class 400 flanges; however, Mandatory Appendix I does contain requirements for this class, expressed in U.S. Customary units only.
2.4 Convention
For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum and minimum values) are specified shall be as defined in ASTM E29. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.
2.5 Denotation
2.5.1 Pressure Rating Designation. Class, followed by a dimensionless number, is the designation for pressure— temperature ratings as follows: Classes 300,400,600,900, 1500, and 2500.
2.5.2 Sizes. NPS, followed by a dimensionless number, is the designation for the nominal flange size. NPS is related to the reference nominal diameter, DN, used in international standards. The relationship is, typically, as follows:
2.6 Service Conditions
Criteria for selection of materials suitable for the particular fluid service are not within the scope of this Standard.
3 PRESSURE-TEMPERATURE RATINGS
The pressure—temperature ratings, including all use recommendations and limitations, and the method of rating given in ASME B16.5 apply to these flanges.
4 MATERIAL
4.1 GeneraL
Flange materials shall be in accordance with the requirements ofASME B 16.5. Flanges shall be manufactured as one piece in accordance with the applicable materials specification. Except when the purchaser chooses flanges with nipples welded to the flange taps, assembly of multiple pieces into the finished product by welding or other means is not permitted by this Standard.ASME B16.36 pdf download.