ASME B16.36:2020 pdf download

ASME B16.36:2020 pdf download.Orifice Flanges
1 SCOPE
This Standard covers pressure–temperature ratings, materials, dimensions, tolerances, testing, and making of flanges (similar to those covered in ASME B16.5) 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 provi- sions to the extent referenced herein constitute require- ments 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. 2.3 ð20Þ 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 systemsofunitsaretoberegardedseparatelyasstandard. 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. lastright-hand digitused forexpressingthe limit. Decimal values and tolerances do notimply 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– temperatureratingsasfollows: Classes300,400,600,900, 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:
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 re- quirements ofASME B16.5. Flanges shallbemanufactured 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.4.3 Materials Manufactured to Other Editions Materials may meet the requirements ofmaterial spec- ification editions other than those listed in ASME B16.5, Mandatory Appendix II, provided (a) the materials are the same specification, e.g., grade, type, class, or alloy, and heat-treated conditions, as appli- cable (b) the flange manufacturer certifies that the require- ments of the edition of the specification listed in ASME B16.5, Mandatory Appendix II have been met 4.4 Plugs Pressure-retainingplugsshallconformtoASMEB16.11, unless otherwise agreed between purchaser and manu- facturer. Plug material shall be at least as corrosion resis- tant as the corresponding flange material.
9 PRESSURE TAPS
9.1 General Each orifice flange shall be provided with two pressure tap holes extending radially from the outside diameter of the flange to the inside diameter ofthe flange. Corner taps may be used on NPS 1 1 ∕ 2 and smaller ifspace permits. See Figure 9.1-1. For ring joint flanges listed in Tables 5-2 through 5-5, andMandatoryAppendixI,whereradialtapswillinterfere with the ring groove, angular meter taps, as illustrated in Figure 9.1-2, will be required. 9.2 Location 9.2.1 Measurement. The distance between the center- line ofthe tap and the face ofthe flange shall be measured atthe bore. Dimensions differentthan those shown in the tables may be supplied by agreement between the purchaser and manufacturer. 9.2.2 Identification. When methods other than those described in this Standard are used for ring joint flanges requiring changes to the pressure tap location due to interference with the ring groove, such changes shall be identified as agreed by purchaser and manufacturer. 9.3 Pipe Connection Unless otherwise specified by the purchaser, orifice flanges shall be supplied with NPS 1 ∕ 2 threaded connec- tions. 9.3.1 NPS 1 ⁄ 2 Taps. Pressure tap connections may be internally threaded in accordance with ASME B1.20.1 or socket welding in accordance with ASME B16.11. Each threaded pressure tap connection shall be equipped with a pipe plug meeting the requirements of para.