ASME B16.36-2015 pdf download

ASME B16.36-2015 pdf download.Orifice Flanges.
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 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 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 or in separate tables. 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. 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
(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 Ill of ASME B16.5, refer to para. 4.3.
4.3 Materials Manufactured to Other Editions
Materials may meet the requirements of material specification 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 requirements of the edition of the specification listed in Mandatory Appendix 111 of ASME B16.5 have been met
4.4 Plugs
Pressure-retaining plugs shall conform to ASME B16.l1, unless otherwise agreed between purchaser and manufacturer. Plug material shall be at least as corrosion resistant as the corresponding flange material.
5 SIZE
Orifice flange sizes are indicated by the nominal pipe size to which they are attached. Only those listed in Tables 1 through 5, Tables 1-1 through 1-5, and Mandatory Appendix II are considered standard.
6 MARKING
Flanges shall be marked as required in ASME B16.5. For welding neck flanges only, the bore diameter shall be marked.
7 FLANGE FACING FINISH
The finish of contact faces shall conform to the requirements of ASME B 16.5.
8 GASKETS FOR RAISED FACE FLANGES
8.1 Gasket Thickness
Flange dimensions are based on the use of 1.5 mm (0.06 in.) thick gaskets.
8.2 Flange Gaskets Requiring Dimensional Changes
When the location of the pressure tap with respect to the orifice plate is critical to the service and metering conditions, its location may be altered to accommodate other than 1.5 mm (0.06 in.) thick gaskets or ring-type joint gaskets whose thickness may vary from that listed in Tables 2 through 5 or those listed in Tables 1-2 through 1-5 or Mandatory Appendix II.
The alteration of location may also be accomplished by the removal of 2 mm (0.06 in.) from the raised face of the flange. If an original 2 mm (0.06 in.) high raised face is removed, the user is cautioned to limit the outside diameter of the gasket or orifice plate to the tabulated R dimension.
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 of the flange. Corner taps may be used on NPS 1/2 and smaller if space permits. See Fig. 1.
For ring joint flanges listed in Tables 2 through 5, Tables 1-2 through 1-5, 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.