Welding Guidelines for the Chemical, Oil, and Gas Industries APIRECOMMENDEDPRACTICE582 FOURTH EDITION, MAY 2023 API American Petroleum Institute Special Notes APl publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed. The use of APl publications is voluntary. In some cases, third parties or authorities having jurisdiction may choose to incorporate API standards by reference and may mandate compliance. make any warranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of the information contained herein, or assume any liability or responsibility for any use, or the results of such use, of any information or process disclosed in this publication. Neither APl nor any of APl's employees, subcontractors, consultants, or other assignees represent that use of this publication would not infringe upon privately owned rights. APl publications may be used by anyone desiring to do so. Every effort has been made by the Institute to ensure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims having jurisdiction with which this publication may conflict. APl publications are published to facilitate the broad availability of proven, sound engineering and operating practices. These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized. The formulation and publication of APl publications is not intended in any way to inhibit anyone from using any other practices. Any manufacturer marking equipment or materials in conformance with the marking requirements of an APl standard is solely responsible for complying with all the applicable requirements of that standard. APl does not represent, warrant, or guarantee that such products do in fact conform to the applicable APl standard. any given situation. Users of this recommended practice should consult with the appropriate authorities having jurisdiction. Users of this recommended practice should not rely exclusively on the information contained in this document. Sound business, scientific, engineering, and safety judgment should be used in employing the information contained herein. Where applicable, authorities having jurisdiction should be consulted. Work sites and equipment operations may differ. Users are solely responsible for assessing their specific equipment and premises in determining the appropriateness of applying the recommended practice. At all times users should employ sound business, scientific, engineering, and judgment safety when using this recommended practice. APl is not undertaking to meet the duties of employers, manufacturers, or suppliers to warn and properly nor undertaking their obligations to comply with authorities having jurisdiction. All rights reserved. No part of this work may be reproduced, translated, stored in a retrieval system, ol transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the publisher, APl Publishing Services, 2oo Massachusetts Avenue, NW, Suite 1100, Washington, Dc 20001. Copyright @ 2023 American Petroleum Institute @ Foreword Nothing contained in any APl 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 liability for infringement of letters patent. The verbal forms used to express the provisions in this document are as follows. Shall: As used in a standard, “shall" denotes a minimum requirement in order to conform to the standard. Should: As used in a standard, “should" denotes a recommendation or that which is advised but not