ASME B16.36-2015 pdf download – Orifice Flanges.
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 designation for pressure—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 in international standards. The relationship is, typically, as follows:
GENERAL NOTE: For NI, the related DN = 25 x (NI’S).
2.6 Service Conditions
Criteria for selection of materials suitable for the particular fluid service are not within the scope of this Standard.
3 PRESSURE—TEMPERATURE RATINGS
The pressure—temperature ratings, including all use recommendations and limitations, and the method of rating given in ASME B16.5 apply to these flanges.
4 MATERIAL
4.1 General
(a) Flange materials shall he in accordance with the requirements of ASME B16.5. Flanges shall be manufactured as one piece in accordance with the applicable materials specification. Assembly of multiple pieces into the finished product by welding or other means is not permitted by this Standard.
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 1-1, 1-2, 1-3, 1-4, and 1-5, and Mandatory Appendix 11 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 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 joint. The counterbore and chamfer shall be concentric with the thread.
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 1-1, 1-2, 1-3, 1-4, and 1-5, and Mandatory Appendix 11 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 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 joint. The counterbore and chamfer shall be concentric with the thread.