ASME B16.36:2015 pdf download

ASME B16.36:2015 pdf download.Orifice Flanges
2 GENERAL
2.1 References Codes, standards, and specifications containingprovi- sions to the extent referenced herein constitute require- ments of this Standard. These reference documents are listed in Mandatory Appendix III. 2.2 Quality Systems Nonmandatory requirements relating to the product manufacturer’s Quality System Program are described in Nonmandatory Appendix A. 2.3 Relevant Units This Standard states values in both SI (Metric) and U.S. Customary units. As an exception, diameter ofbolts 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 or in separate tables. The values statedineachsystemarenotexactequivalents;therefore, it is required that each system of units be used indepen- dently of the other. Except for diameter of bolts and flange bolt holes, combining values from the two sys- tems constitutes nonconformance with the Standard. Except for Class 400, the values in U.S. Customary units are in Mandatory Appendix I. The main text of this Standard does not contain requirements for Class 400 welding neck flanges; however, Mandatory Appendix II 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 (a) Class, followed by a dimensionless number, is the designationforpressure–temperature ratings as follows: Classes 300 600 900 1500 2500. (b) Class 400 is retained in the U.S. Customary tables. 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 ininternational standards. The relationship is, typi- cally, as follows:
4 MATERIAL
4.1 General (a) Flange materials shall be in accordance with the requirements of ASME B16.5. Flanges shall be manufac- tured as one piece in accordance with the applicable materials specification. Assembly ofmultiple pieces into the finished product by welding or other means is not permitted by this Standard.(b) For materials manufactured to editions of the material specification other than those listed in Mandatory Appendix III of ASME B16.5, refer to para. 4.3. 4.2 Bolting Bolting material recommendations are given in ASME B16.5. For materials manufactured to editions of the material specification other than those listed in Mandatory Appendix III of ASME B16.5, refer to para. 4.3. 4.3 Materials Manufactured to Other Editions Materials may meetthe requirements ofmaterial spec- ification editions other than those listed in Mandatory Appendix III of ASME B16.5, provided (a) the materials are the same specification, e.g., grade, type, class, or alloy, and heat-treated conditions, as applicable (b) the flange manufacturer certifies that the require- ments of the edition of the specification listed in Mandatory Appendix III of ASME B16.5 have been met 4.4 Plugs Pressure-retaining plugs shall conform to ASME B16.11, unless otherwise agreed between pur- chaser and manufacturer. Plug material shall be at least as corrosion resistant as the corresponding flange material.
9 PRESSURE TAPS
9.1 General Each orifice flange shall be provided with two pres- sure tap holes extending radially from the outside diam- eter of the flange to the inside diameter of the flange. Corner taps may be used on NPS 1 1 ⁄ 2 and smaller if space permits. See Fig. 1. For ring joint flanges listed in Tables 2 through 5, Tables I-2 through I-5, and Mandatory Appendix II, where radial taps will interfere with the ring groove, angular meter taps, as illustrated in Fig. 2, will be required. Each pressure tap hole shall be equipped with a pipe plug. 9.2 Location 9.2.1 Measurement. The 24 mm(0.94 in.) dimension for raised face and 19 mm (0.75 in.) for ring joint shall be measured at the bore. 9.2.2 Identification. For ring joint flanges requiring alteration of pressure tap location due to interference with the ring groove other than methods provided in this Standard, such alteration shall be identified per agreement between purchaser and manufacturer.