ASME B16.36:2006 pdf download Orifice Flanges
1.1General
This Standard covers flanges (similar to those coveredin ASME B16.5) that have orifice pressure differentialconnections Coverage is limited to the following:
(a) welding neck flanges Classes 300,600,900,1500.and 2500.U.S.Customary units are presented inMandatory Appendix I.
(b) slip-on and threaded Class 300.(c) welding neck flanges Class 400 in U.S. Customaryunits in Mandatory Appendix Il.
1.2 References
Codes, standards,and specifications containing provisions to the extent referenced herein constitute require-ments of this Standard. These reference documents arelisted in Mandatory Appendix IIl.
1.3 Quality Systems
Nonmandatory requirements relating to the productmanufacturer’s Quality System Program are describedin Nonmandatory Appendix A
1.4 Relevant Units
This Standard states values in both metric and USCustomary units. As an exception, diameter of bolts andflange bolt holes are expressed in inch units only. Thesesystems of units are to be regarded separately as standard. Within the text, the US. Customary units areshown in parentheses or in separate tables. The valuesstated in each system are not exact equivalents; there-fore, it is required that each system of units be usedindependently of the other. Except for diameter of boltsand flange bolt holes, combining values from the twosystems constitutes nonconformance with the standard.Except for Class 400 the values in U.S Customary unitsare in Mandatory Appendix I. The main text of thisStandard does not contain requirements for Class 400welding neck flange; however, Mandatory Appendix Ildoes contain requirements for this class, expressed inUS Customary units only.
15 Convention
For the purposes of determining conformance withthis Standard, the convention for fixing significant digitswhere limits and maximum and minimum values arespecified, shall be rounded as defined in ASTM Practice E 29. This requires that an observed or calculated valueshall be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal valuesand tolerances do not imply a particular method of mea-surements.
1.6 Denotation
1.6.1 Pressure Rating Designation(a) Class, followed by a dimensionless number, is thedesignation for pressure-temperature ratings as follows:Classes 300 600 900 1500 2500.(b) Class 400 is retained in the U.S. Customary tables.
1.6.2 Sizes.NPS,followed by a dimensionlessnumber, is the designation for the nominal flange size.NPS is related to the reference nominal diameter, DNused in international standards.The relationship is, typically, as follows:
GENERAL NOTE: For NPS 2 4, the related DN = 25 (NPS)
1.7 Service Conditions
Criteria for selection of materials suitable for the par-ticular fluid service are not within the scope of thisStandard.
2 PRESSURE-TEMPERATURE RATINGS
The pressure-temperature ratings, including all userecommendations and limitations, and the method ofrating given in ASME B16.5 apply to these flanges.
3MATERIAL
31 General
Flange materials shall be in accordance with therequirements of ASME B165
3.2 Bolting
Bolting material recommendations are given inASME B16.5