_RP_934-C-2019.pdf

Materials and Fabrication of 11/4Cr-1/2Mo Steel Heavy Wall Pressure Vessels for High-pressure Hydrogen Service Operating at or Below 825 F(440 C)RECOMMENDED PRACTICE 934-C SECOND EDITION,FEBRUARY 2019Special NotesAPI publications necessarily address problems of a general nature.With respect to particular circumstances,local,state,and federal laws and regulations should be reviewed.Neither API nor any of APIs employees,subcontractors,consultants,committees,or other assignees 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 API nor any of APIs employees,subcontractors,consultants,or other assignees represent that use of this publication would not infringe upon privately owned rights.Classified areas may vary depending on the location,conditions,equipment,and substances involved in 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.API is not undertaking to meet the duties of employers,manufacturers,or suppliers to warn and properly train and equip their employees,and others exposed,concerning health and safety risks and precautions,nor undertaking their obligations to comply with authorities having jurisdiction.API 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 any liability or responsibility for loss or damage resulting from its use or for the violation of any authorities having jurisdiction with which this publication may conflict.API 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 API 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 API standard is solely responsible for complying with all the applicable requirements of that standard.API does not represent,warrant,or guarantee that such products do in fact conform to the applicable API standard.All rights reserved.No part of this work may be reproduced,translated,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,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Copyright 2019 American Petroleum InstituteForewordNothing contained in any API 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 patent.Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent.The verbal forms used to express the provisions in this specification are as follows:the term“shall”denotes a minimum requirement in order to conform to the standard;the term“should”denotes a recommendation or that which is advised but not required in order to conform to the standard;the term“may”is used to express permission or a provision that is optional;the term“can”is used to express possibility or capability.Informative elementsAs used in a standard,“informative”denotes elements that identify the document,introduce its content,and explain its background,development,and its relationship with other documents or provide additional information intended to assist the understanding or use of the document.Normative elementsAs used in a standard,“normative”denotes elements that describe the scope of the document and that set out provisions that are required to implement the standard.This document was produced under API standardization procedures that ensure appropriate noti