1、,USA STANDARD C O D E F O R P R E S S U R E P I P I N G Nuclear Power Piping USAS B31.7-1969 S,O t z d O The American Society of Mechanical Engineers T H E A M E R I C A N S O C I E T Y O F M E C H A N I C A L E N G I N E E R S United Engineering Center New York,N.Y.1001 7 345 East 47th Street Copyr
2、ight ASME International Provided by IHS under license with ASME Licensee=University of Alberta/5966844001,User=trert,rtyrtyrtyNot for Resale,03/07/2015 23:00:42 MSTNo reproduction or networking permitted without license from IHS-,-,-ERRATA USAS 831.7-1969,Nuclear Power Piping Page 174,Para.F-105.2.6
3、,in the 13th and 18th lines replace Table A.l with Table A.2.USA STANDARD This USA Standard i s one of nearly 3000 standards approved as American Scan-dards by the American Standards Association.On August 24,1966,the ASA was reconstituted as the United States of America Standards Institute.Standards
4、 ap-proved as American Standards are now designated USA Standards.There is no change in their index identification or technical content.Copyright,1969 by Printed in U.S.A.THE AMERICAN SOCIETY OF MECHNICAL ENGINEERS Copyright ASME International Provided by IHS under license with ASME Licensee=Univers
5、ity of Alberta/5966844001,User=trert,rtyrtyrtyNot for Resale,03/07/2015 23:00:42 MSTNo reproduction or networking permitted without license from IHS-,-,-USA Standard 631.7,Nuclear Power Piping Foreword FOREWORD The Piping Code of the United States of America Standards Institute(formerly American Sta
6、ndards Association)was originally published in 1935 as the American Tentative Standard Code for Pressure Piping(B31.1).It covered sections on(I)power piping systems,(2)gas and air pip-ing,(3)oil piping,(4)district heating piping,(5)fabrication details,and(6)materials.During the subsequent thirty yea
7、rs,the Piping Code has undergone numerous revisions and additions to reflect the advancing state of knowledge in the design,manufacture,inspection and installa-tion of piping systems,as well as to encompass the increased variety and severity of service conditions.In 1952,a new section of the code wa
8、s pub-lished to cover gas transmission and distribution piping systems.Subsequent to the 1955 edition of B31.1,a decision was made to publish other industry sections as separate documents.While a strong effort was and continues to be made to keep these various sections as nearly alike as feasible,th
9、e continuation of separate sections for different industries is a recognition of the variation in needs for different applications.The 1955 issue of B31.1 is particularly note-worthy in chat it introduced several new concepts into the piping code;fatigue failure due to ex-pansion stresses*was consid
10、ered,along with the concept of stress range and,the maximum shear stress,as pertinent to the fatigue of piping systems.Quantitative evaluation of local expan-sion stresses was introduced through“stress intensification factors.”Along with recognition of these local stresses,an appropriate increased*F
11、or delinition o/”expansion stresses.,see Par.F-i02 o/the Nuclear Piping Code.“Herealter reierred to as the“Nuclear Piping Code”.111 limit for such local expansion stresses was per-mitted;up to 2.5 times the stress permitted for the hoop stress due to internal pressure in pipe.These innovations prece
12、ded by some 8 years the introduction of analogous concepts into the ASME Nuclear Pressure Vessels Code.The Piping Code,in certain aspects,has established and maintained parallelism with the ASME Boiler Code;a logical relationship since both codes are concerned with the safe construc-tion of pressure
13、 retaining structures.The Power Piping Section of the Piping Code is parallel to Section No.1,Power Boilers,of the ASME Boiler and Pressure Vessel Code;reflecting the degree of service life and reliability required for fossil-fuel steam power boilers and the as-sociated piping.The Petroleum Refinery
14、 Piping Section of the Piping Code is parallel to Section No.VIII,Unfired Pressure Vessels,again re-flecting similarities in required service life and reliability between vessels as used in typical petroleum and chemical processing plants and the associated piping.In 1963,Section III,Nuclear Vessels
15、,of the ASME Boiler and Pressure Vessel Code was first issued.The Nuclear Vessels Code is in-tended to encompass the rigorous requirements for reliability necessary in the design and con-struction of nuclear pressure vessels.The Nu-clear Power Piping Section of the Piping Code(USAS B31.7)*parallels
16、the requirements of the ASME Nuclear Vessels Code,again reflecting similarities in requirements for nuclear vessels and the associated piping.Following approval by the Standards Com-mittee and the sponsor,the USA Standards Insti-tute approved this Code on August 24,1969.Copyright ASME International Provided by IHS under license with ASME Licensee=University of Alberta/5966844001,User=trert,rtyrtyrtyNot for Resale,03/07/2015 23:00:42 MSTNo reproduction or networking permitted without license from
