_API_Publ_2021A-1998.pdf

SPECIAL NOTESAPI 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,manufacturers,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,orfederal laws.Information concerning safety and health risks and proper precautions with respect to par-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 method,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.A catalog of API publications and materials is published annually and updated quarterlyby API,1220 L Street,N.W.,Washington.D.C.20005.An on-line interactive version of theAPI catalog is accessible at http:/www.api.org.This study is published to facilitate the broad availability of proven,sound engineeringand operating practices.It is not intended to obviate the need for applying sound engineeringjudgment regarding when and where these standards should be utilized.The formulation andpublication of API standards is not intended in any way to inhibit anyone from using anyother practices.All rights reserved.No part of this work may be reproduced,stored in a retrieval system,ortransmitted 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.,Washington,D.C.20005.Copyright 1998 American Petroleum InstituteCOPYRIGHT 2000 American Petroleum InstituteInformation Handling Services,2000