ASME B16.9:2003 pdf free download – FACTORY-MADE WROUGHT BUTTWELDING FITTINGS
1.1 General
This Standard covers overall dimensions, tolerances,ratings, testing, and markings for wrought factory-madebuttwelding fittings in sizes NPS through 48 (DN 15through 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.Fabricated lap joint stub ends are exempt from theabove restrictions, provided they meet all the require-ments of the applicable ASTM material specificationlisted in para. 5.
1.4Standard Units
The values stated in either metric or U.S. customaryunits are to be regarded separately as standard. Withinthe text, the U.S.customary units are shown in parenthe-ses.The values stated in each system are not exact equiv-alents; therefore, each system must be usedindependently of the other.Combining values from thetwo systems may result in nonconformance with thisStandard.
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
1.5.1 Referenced Standards.Standards and specifica-tions adopted by reference in this Standard are shownin Mandatory Appendix lI. 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 l. A product 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 govern-mental 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.
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.Thisrequires that an observed or calculated value shall berounded off to the nearest unit in the last right-handdigit used in expressing the limit. Decimal values andtolerances do not imply a particular method of mea-surement.
1.10 Pressure Rating Designation
Class，followed by a dimensionless number,is thedesignation for pressure-temperature ratings.Standard-ized designations for flanges per ASME B16.5 referencedin this Standard are Classes 150,300,600,900,1500,and 2500.
2.2 Design of Fittings
The design of fittings shall be established by mathe-matical analyses (e.g-,ASME B16.49 for bends)containedin nationally recognized pressure vessel or piping codes,or at the manufacturer’s option by proof testing in accor-dance with para. 9 of this Standard. In order to meetdesign or manufacturing requirements,it is expectedthat some portion of formed fittings may have to bethicker than the pipe wall with which the fitting isintended to be used. The mathematical analyses, if used,may take into account such thicker sections. Records ofmathematical analysis and/or successful proof test datashall be available at the manufacturer’s facility forinspection by the purchaser.