1、FOREWORDThis is the second edition of Spec 5LD as approved by letter ballot through December,1996.Spec 5LD covers seamless,centrifugal cast,and welded clad steel line pipe,and linedsteel pipe with improved corrosion-resistant properties.The clad and lined steel line pipespecified in this document sh
2、all be composed of a base metal outside and CRA layer insidethe pipe.The base material shall conform to API Spec 5L,Specification for Line Pipe,exceptas modified in the 5LC document.Spec 5LD provides standards for pipe with improved cor-rosion-resistance suitable for use in conveying gas,water,and o
3、il in both the oil and naturalgas industries.The bar notations identify parts of this standard that have been changed from the previousAPI edition.This standard shall become effective on the date printed on the cover,but may be used vol-untarily from the date of distribution.API publications may be
4、used by anyone desiring to do so.Every effort has been made bythe Institute to assure the accuracy and reliability of the data contained in them;however,theInstitute makes no representation,warranty,or guarantee in connection with this publicationand hereby expressly disclaims any liability or respo
5、nsibility for loss or damage resultingfrom its use or for the violation of any federal,state,or municipal regulation with which thispublication may conflict.Suggested revisions are invited and should be submitted to the director of the Explorationand Production Department,American Petroleum Institute,1220 L Street,N.W.,Washington,D.C.20005.d without license from IHSNot for Resale