ASME B16.9 pdf download

ASME B16.9 pdf download

1 scOPE1.1 General
This Standard covers overall dimensions,tolerances,ratings,testing, and markings for wrought factory-madebuttwelding fittings in sizes NPs through 48 (DN15 through 1200).
1.2 Special Fittings
Fittings may be made to special dimensions,sizes,shapes, and tolerances by agreement between the manu-facturer and the purchaser.
1.3 Fabricated Fittings
Fabricated laterals and other fittings employing cir-cumferential or intersection welds are considered pipefabrication, and are not within the scope of this Standard.1.4 Standard Units
The values stated in either metric or U.s.Customaryunits are to be regarded separately as standard. Within thetext, the U.s.Customary units are shown in parentheses.The values stated in each system are not exact equivalents;therefore, each system must be used independently of theother.Combining values from the two systems may resultin nonconformance with this Standard.
The designations for pressure rating and size areClass and NPS for both metric and customary dimen-sioned fittings. The designations PN and DN used ininternational standards are shown for reference conve-nience.
1.5 References
1.5.1 Referenced Standards.Standards and spec-ifications adopted by reference in this Standard areshown in Mandatory Appendix l. It is not consideredpractical to identify the specific edition of each standardand specification in the individual references. Instead,the specific edition reference is identified in MandatoryAppendix II. A product made in conformance with aprior edition of reference standards and in all otherrespects conforming to this Standard will be consideredto be in conformance.
1.5.2 Codes and Regulations. Afitting usedunder the jurisdiction of the ASME Boiler and PressureVessel Code,the ASME Code for Pressure Piping. ora governmental regulation is subject to any limitationof that code or regulation. This includes any maximumtemperature limitation. or rule governing the use of amaterial at low temperature.
1.6 Service Conditions
Criteria for selection of fitting types and materialssuitable for particular fluid service are not within thescope of this Standard.
1.7 Welding
Installation welding requirements are outside thescope of this Standard.
1.8 Quality Systems
Nonmandatory requirements relating to the fittingmanufacturer’s Quality System Program are describedin Nonmandatory Appendix A.
1.9 Convention
For the purpose of determining conformance withthis Standard, the convention for fixing significant digitswhere limits,maximum or minimum values.are speci-fied shall be rounded off as defined in ASTM E 29.This requires that an observed or calculated value shallbe “”rounded off” to the nearest unit in the last right-hand digit used in expressing the limit. Decimal valuein the last and tolerances do not imply a particularrnethod of measurement.
2.1 Basis of Ratings
The allowable pressure ratings for fittings designedin accordance with this Standard may be calculated asfor straight seamless pipe of equivalent material (asshown by comparison of composition and mechanicalproperties in the respective material specifications) inaccordance with the rules established in the applicable.

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