1、Recommended Practice for Internal Coating of Line Pipe for Non-corrosive Gas Transmission ServiceAPI RECOMMENDED PRACTICE 5L2FOURTH EDITION,JULY 2002REAFFIRMED,MAY 2015 Recommended Practice for Internal Coating of Line Pipe for Non-corrosive Gas Transmission ServiceUpstream SegmentAPI RECOMMENDED PR
2、ACTICE 5L2FOURTH EDITION,JULY 2002REAFFIRMED,MAY 2015 SPECIAL NOTES API publications necessarily address problems of a general nature.With respect to partic-ular circumstances,local,state,and federal laws and regulations should be reviewed.API is not undertaking to meet the duties of employers,manuf
3、acturers,or suppliers towarn and properly train and equip their employees,and others exposed,concerning healthand safety risks and precautions,nor undertaking their obligations under local,state,or fed-eral laws.Information concerning safety and health risks and proper precautions with respect to pa
4、r-ticular materials and conditions should be obtained from the employer,the manufacturer orsupplier of that material,or the material safety data sheet.Nothing contained in any API publication is to be construed as granting any right,byimplication or otherwise,for the manufacture,sale,or use of any m
5、ethod,apparatus,or prod-uct covered by letters patent.Neither should anything contained in the publication be con-strued as insuring anyone against liability for infringement of letters patent.Generally,API standards are reviewed and revised,reafrmed,or withdrawn at least everyve years.Sometimes a o
6、ne-time extension of up to two years will be added to this reviewcycle.This publication will no longer be in effect ve years after its publication date as anoperative API standard or,where an extension has been granted,upon republication.Statusof the publication can be ascertained from the API Upstr
7、eam Segment telephone(202)682-8000.A catalog of API publications and materials is published annually and updated quar-terly by API,1220 L Street,N.W.,Washington,D.C.20005.This document was produced under API standardization procedures that ensure appropri-ate notication and participation in the deve
8、lopmental process and is designated as an APIstandard.Questions concerning the interpretation of the content of this standard or com-ments and questions concerning the procedures under which this standard was developedshould be directed in writing to the standardization manager,American Petroleum In
9、stitute,1220 L Street,N.W.,Washington,D.C.20005.Requests for permission to reproduce ortranslate all or any part of the material published herein should also be addressed to the gen-eral manager.API standards are published to facilitate the broad availability of proven,sound engineer-ing and operati
10、ng practices.These standards are not intended to obviate the need for apply-ing sound engineering judgment regarding when and where these standards should beutilized.The formulation and publication of API standards is not intended in any way toinhibit anyone from using any other practices.Any manufa
11、cturer marking equipment or materials in conformance with the markingrequirements of an API standard is solely responsible for complying with all the applicablerequirements of that standard.API does not represent,warrant,or guarantee that such prod-ucts do in fact conform to the applicable API stand
12、ard.All rights reserved.No part of this work may be reproduced,stored in a retrieval system,or transmitted by any means,electronic,mechanical,photocopying,recording,or otherwise,without prior written permission from the publisher.Contact the Publisher,API Publishing Services,1220 L Street,N.W.,Washi
13、ngton,D.C.20005.Copyright 2002 American Petroleum Institute FOREWORD This Recommended Practice is under the jurisdiction of the Subcommittee on TubularGoods of the American Petroleum Institute.It was prepared by a Formulating Committeewhich included representatives of Pipeline Operators and Line Pip
14、e Manufacturers and advi-sors from coating manufacturers and coating applicators as well as other interested individuals.The purpose of this Recommended Practice is to present methods of qualifying coatingmaterials,production application of such materials,and a nal acceptance test of coated pipefor
15、non-corrosive natural gas transmission.Some benets to be derived from internallycoated line pipe are:(1)Improved ow characteristics(2)Corrosion protection during theperiod preceding construction(3)The enhancement of visual inspection of the internal pipesurfaces(4)The Improvement of pigging efciency
16、.Recommendations made in this Recommended Practice need not necessarily be consid-ered as minimum standard requirements.However,the Recommended Practice is written insuch a manner that it may be adopted as part of a contract specication.The RecommendedPractice does not in any way intend to recommend one type of coating over any other typeand regards all types which can pass the specied qualication as being suitable for theintended purpose.As new materials and practices are developed they will be
