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ASME B16.36-2015 pdf download

ASME B16.36-2015 pdf download.Orifice Flanges.
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. 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 I-1 through I-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 finishofcontactfaces shallconform to the require- ments of ASME B16.5. 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 2 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 I-2 through I-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 limitthe 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 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. 9.3 Pipe Connection Unless otherwise specified, pressure tap holes may be either tapped 1 ⁄ 2 NPT in accordance with ASME B1.20.1 or 1 ⁄ 2 NPS socket connection in accordance with ASME B16.11. 10 JACK SCREW PROVISION 10.1 Location Each flange shall have a machine bolt mounted in a hole drilled on the flange bolt circle centerline at 90 deg from the pressure taps, for use as a jack screw. The machine bolt shall be regular with one heavy hex nut. See Fig. 3.
10.3 Tapped Hole As an alternative to para. 10.2, a tapped hole may be provided and the hex nut omitted when agreed on between the purchaser and the manufacturer. 11 FLANGE DIMENSIONS Dimensions are listed in Tables 1, 2, 3, 4, and 5 for metric, and Tables I-1, I-2, I-3, I-4, and I-5, and Mandatory Appendix II for U.S. Customary. 12 FLANGE THREADS Threaded flanges shall have an American National Standard taper pipe thread conforming to ASME B1.20.1. (a) The thread shall be concentric with the axis of the flange. Variations inalignmentshall notexceed 5 mm/m (0.06 in./ft). (b) The flanges are made with counterbores at the back of the flange and the threads shall be chamfered to the diameterofthe counterbore atanangle ofapproxi- mately 45 deg with the axis of the thread to afford easy entrance in making a joint. The counterbore and chamfer shall be concentric with the thread. 3 (c) In order to permit the pipe to be inserted to the face of the flange, the threads should have full root diameters through to the face of the flange, or shall have a counterbore at the face of the flange. (d) The gaging notch of the working gage shall come flush with the bottom of the chamfer in all threaded flanges and shall be considered as being the intersection of the chamfer cone and the pitch cone of the thread. This depthofchamfer is approximatelyequal to one-half the pitch of the thread. (e) The maximum allowable thread variation is one turn large or small from the gaging notch. 13 TOLERANCES Tolerances on all dimensions shall be as shown in ASME B16.5 except for those shown below. 13.1 Pressure Tap Location Tolerance on location of center of pressure tap hole 1 from flange face shall be (a) ±0.5 mm (±0.02 in.) for flanges smaller than NPS 4 (b) ±0.8 mm (±0.03 in.) for flanges NPS 4 and larger 13.2 Bore Diameter Bore diameter tolerance (welding neck flanges only) is ±0.5% of nominal value.

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