API_608_5th_ed_rev For Committee Use Only金属球阀.pdf

Metal Ball Valves—Flanged, Threaded and Welding Ends API STANDARD 608 FOURTH EDITION, DECEMBER 2008 FIFTH EDITION, XXXX 2013 EFFECTIVE DATE: JUNE 2009 2 API STANDARD 608 Metal Ball Valves—Flanged, Threaded and Welding Ends Downstream Segment API STANDARD 608 FOURTH EDITION, DECEMBER 2008 FIFTH EDITION, XXXX 2013 METAL BALL VALVES—FLANGED, THREADED AND WELDING ENDS 3 Foreword Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent. Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform to the specification. Should: As used in a standard, “should” denotes a recommendation or that which is advised but not required in order to conform to the specification. This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director. Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is pub