ASME B16.36-2020 pdf download
ASME B16.36-2020 pdf download.Orifice Flanges.
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. 5 SIZE Orifice flange sizes are indicated by the nominal pipe size to which they are attached. Only those listed in Tables 5.1 through 5.5 and Mandatory Appendix I 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 ofcontactfaces shall conform 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 ð20Þ 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, the distance from the face of the flange to the tap centerline may be changed 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 5-2 through 5-5 or Mandatory Appendix I.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. 4.4. Each socket pressure tap connection shall be fitted with a plastic socket weld plug. 9.3.2 Nipples. NPS 1 ∕ 2 or NPS 3 ∕ 4 nipples may be provided at the pressure tap connections when specified by the purchaser. Unless otherwise agreed by the purchaser and the manufacturer, nipples shall (a) extend 75 mm (3 in.) beyond the outside diameter of the flange (b) have plain ends (c) be Schedule 160 wall thickness in accordance with ASME B36.10M The flanges are made withcounterbores atthe back of the flange and the threads shall be chamfered to the diameter ofthe counterbore at an angle ofapproximately 45 degwiththeaxisofthethreadtoaffordeasyentrancein making a joint. The counterbore and chamfer shall be concentric with the thread. (c) In order to permit the pipe to be inserted into 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 ofthe chamfer cone and the pitch cone ofthe thread. This depth of chamfer is approximately equal to one-half the pitch of the thread. (e) The maximum allowable thread variation is one turn large or small from the gaging notch.
