1、Specification for Wellhead and Tree Equipment API SPECIFICATION 6A TWENTY-FIRST EDITION,NOVEMBER 2018 API MONOGRAM PROGRAM EFFECTIVE DATE:NOVEMBER 2019 ERRATA 1,APRIL 2019 ERRATA 2,JUNE 2020 ERRATA 3,SEPTEMBER 2020 ERRATA 4,SEPTEMBER 2021 ADDENDUM 1,JULY 2020(API MONOGRAM PROGRAM EFFECTIVE DATE:JANU
2、ARY 2021)ADDENDUM 2,JUNE 2021(API MONOGRAM PROGRAM EFFECTIVE DATE:DECEMBER 2021)Special Notes API 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 employe
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4、y 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.API publications may be used by anyone desiring to do so.Every effort has b
5、een 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
6、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
7、engineering judgment regarding when and where these publications should be used.The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices.Users of this specification should not rely exclusively on the information contained in this
8、 document.Sound business,scientific,engineering,and safety judgment should be used in employing the information contained herein.Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for conforming to all the applicable
9、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,photocop
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12、 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 perm
13、ission or a provision that is optional;the term“can”is used to express possibility or capability.This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard.Questions concerni
14、ng the interpretation of the content of this publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards,American Petroleum Institute,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.R
15、equests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every 5 years.A one-time extension of up to 2 years may be added to this review
16、 cycle.Status of the publication can be ascertained from the API Standards Department,telephone(202)682-8000.A catalog of API publications and materials is published annually by API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Suggested revisions are invited and should be submitted to the Standards Department,API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001,standardsapi.org.Contents 1 Scope.1 2 Normative References.1 3 Terms,Definitions,Abbreviated Terms,and Symbols.4
