ASME B16.9:2007 pdf download Factory-Made Wrought Buttwelding Fittings
1 SCOPE
1.1 General
This Standard covers overall dimensions, tolerancesratings, testing,and markings for factory-made wroughtbuttwelding fittings in sizes NPS % through NPS 48(DN 15 through DN 1200).
1.2 Special Fittings
Fittings may be made to special dimensions, sizesshapes, 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 StandardFabricated lap joint stub ends are exempt from theabove restrictions, provided they meet all the require-ments of the applicable ASTM material specificationlisted in section 5.
1.4 Standard Units
The values stated in either metric or US. Customaryunits are to be regarded separately as standard. Withinthe text, the US. Customary units are shown in paren-theses. The values stated in each system are not exactequivalents; therefore, each system must be used independently of the other Combining values from the twosystems may result in nonconformance with this
Standard.The designation for size is NPS for both metric- andcustomary-dimensioned fittings. Fitting pressure ratingis associated with the connecting wall thickness of pipeof equivalent size and material.
1.5 References
1.51 Referenced Standards. Standards and specifi-cations adopted by reference in this Standard are shownin Mandatory Appendix Il. It is not considered practicalto identify the specific edition of each standard andspecification in the individual references. Instead, thespecific edition reference is identified in MandatoryAppendix Il. A roduct made in conformance with aprior edition of referenced standards and in all otherrespects conforming to this Standard will be consideredto be in conformance.
1.5.2 Codes and Regulations.A fitting used underthe jurisdiction of the ASME Boiler and Pressure VesselCode the ASME Code for Pressure Piping, or a governmental regulation is subject to any limitation of that codeor regulation.This includes any maximum temperaturelimitation or rule governing the use of a material at lowtemperature.
1.6 Service Conditions
Criteria for selection of fitting types and materialssuitable for particular fluid service are not within thescope of this Standard.
17 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 describecin 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 specified shall be rounded off as defined in ASTM E 29. Thisrequires that an observed or calculated valueshall be rounded off to the nearest unit in the last right-hand digit used in expressing the limit. Decimal valuesand tolerances do not imply a particular method ofmeasurement.
110 Pressure Rating Designation
Class, followed by a dimensionless number, is thedesignation for pressure-temperature ratings.Standardized designations for flanges per ASME B16.5 referencedin this Standard are Classes 150，300，600，900，1500and 2500.