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were not available. U.S.Customary units also were given. By agreement,either system may have <br /> been used. <br /> Beginning with the 2004 Edition,the publication cycle of ASME B31.3 was changed to biennial. <br /> Other changes made in the 2004 Edition included the introduction of the weld joint strength <br /> reduction factor,W,and the additions of new Appendix P,Alternative Rules for Evaluating Stress <br /> Range, and Appendix S, Piping System Stress Analysis Examples. <br /> Changes that were made to the 2006 and 2008 Editions of ASME B31.3 included the requirement <br /> that valves have blowout-proof stems and the addition of a definition for elevated temperature <br /> fluid service, respectively. The most significant change that was made to the 2010 Edition of <br /> ASME B31.3 was the addition of Chapter X,High Purity Piping.In the 2012 Edition,Tables A-IM <br /> and A-2M were added to Appendix A that give allowable design values in SI metric units, and <br /> Appendix N,Application of ASME B31.3 Internationally, was also added. <br /> For the 2016 Edition, the allowable design values in SI metric units as shown in Tables A-IM <br /> and A-2M were changed from for information only to values that may be used to meet the <br /> requirements of the Code. <br /> In this Edition, SI metric units are given first, with U.S. Customary units in parentheses. <br /> Table K-1 in Appendix K,and Tables C-1 and C-6 in Appendix C,are exceptions,containing only <br /> U.S. Customary units. The allowable design values in Tables A-1 and A-2 are given in U.S. <br /> Customary units, and the SI metric values are given in Tables A-IM and A-2M. Either the U.S. <br /> Customary units or the SI metric units for these allowable design values may be used. Except <br /> for Tables A-1,A-IM,A-2,A-2M,C-1,C-6,and K-1,values in SI metric units are to be regarded <br /> as the standard,unless otherwise agreed between the contracting parties. Instructions are given <br /> in Tables C-1, C-6, and K-1 for converting tabular data in U.S. Customary units to appropriate <br /> SI metric units. <br /> Interpretations,Code Cases,and errata to the B31.3 Code on Process Piping are published on <br /> the following ASME web page: https.11cstools.asme.orglcsconnectICommitteePages.cfm?Committee= <br /> N10020400. <br /> ASME B31.3-2016 was approved by the American National Standards Institute on July 28,2016. <br />