ASME B16.36 pdf download.Orifice Flanges.
ASME B16.36 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 provisions to the extent referenced herein constitute requirements 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.
20 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. 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.
12 FLANGE THREADS
Threaded flanges shall have an American National Standard taper pipe thread conforming to ASME B1.20J.
(a) The thread shall be concentric with the axis of the flange. Variations in alignment shall not exceed 5 mm/rn (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 diameter of the counterbore at an angle of approximately 45 deg with the axis of the thread to afford easy entrance in making a ioint. 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 of the chamfer cone and the pitch cone of the 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.
13 TOLERANCES
Tolerances on all dimensions shall be as shown in ASM E B 16.5 except for those shown below.
13.1 Pressure Tap Location
Tolerance on location of center of pressure tap hole from flange face (see para. 9.2) 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.
ASME B16.36 pdf download
