NBBI NB23-2017

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INTERPRETATIONSOn request, the NBIC Committee will render an interpretation of any requirement of this code. Interpretationsare provided for each part and are specific to the code edition and addenda referenced in the interpretation.Interpretations provide clarification of existing rules in the code only and are not part of this code.JURISDICTIONAL PRECEDENCEReference is made throughout this code to the requirements of the “Jurisdiction.” Where any provision hereinpresents a direct or implied conflict with any jurisdictional regulation, the Jurisdictional regulation shall govern.UNITS OF MEASUREMENTBoth U.S. customary units and metric units are used in the NBIC. The value stated in U.S. customary unitsor metric units are to be regarded separately as the standard. Within the text, the metric units are shown inparentheses. In Part 2, Supplement 6 and Part 3, Supplement 6 regarding DOT Transport Tanks, the metricunits are shown first with the U.S. customary units shown in parentheses.U.S. customary units or metric units may be used with this edition of the NBIC, but one system of units shallbe used consistently throughout a repair or alteration of pressure-retaining items. It is the responsibility of NationalBoard accredited repair organizations to ensure the appropriate units are used consistently throughoutall phases of work. This includes materials, design, procedures, testing, documentation, and stamping. TheNBIC policy for metrication is outlined in each part of the NBIC.

This code was developed under procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code was balanced to ensure that individuals from competentand concerned interests had an opportunity to participate. The proposed code was made available forpublic review and comment, which provided an opportunity for additional public input from industry, academia,regulatory and jurisdictional agencies, and the public-at-large.The National Board does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, oractivity.The National Board does not take any position with respect to the validity of any patent rights asserted inconnection with any items mentioned in this document, and does not undertake to insure anyone utilizing astandard against liability for infringement of any applicable Letters Patent, nor assume any such liability. Usersof a code are expressly advised that determination of the validity of any such patent rights, and the risk ofinfringement of such rights, is entirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpretedas government or industry endorsement of this code.The National Board accepts responsibility for only those interpretations issued in accordance with governingNational Board procedures and policies that preclude the issuance of interpretations by individual committeemembers.The footnotes in this document are part of this American National Standard.