Metal Plug Valves—Flanged, Threaded, and Welding Ends

API STANDARD 599

EIGHTH EDITION, MARCH 2020

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 API’s 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 API’s 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 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 used. 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.

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.

Users of this standard 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.

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 20001-5571.

Copyright © 2020 American Petroleum Institute

ii

Foreword

Nothing 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 document are as follows.

Shall: As used in a standard, “shall” denotes a minimum requirement to conform to the specification.

Should: As used in a standard, “should” denotes a recommendation or that which is advised but not required to

conform to the specification.

May: As used in a standard, “may” denotes a course of action permissible within the limits of a standard. Can: As used in a standard, “can” denotes a statement of possibility or capability.

ThisdocumentwasproducedunderAPIstandardizationproceduresthatensureappropriatenotificationandparticipation in the developmental process and is designated as an API standard. Questions concerning 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. Requests 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 five years. A one-time extension of up to two years may be added to this review 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, standards@api.org.

Contents

Page

1. Scope 1

2. Normative References 2

3. Terms and Definitions 3

4. Pressure/Temperature Ratings 4

5. Design 4

   1. General 4

   2. Body 4

   3. Bonnet/Cover 6

   4. Stem and Plug 6

   5. Glands 7

   6. Bolting 7

   7. Operation 7

   8. Electrical Continuity 8

6. Materials 8

   1. General 8

   2. Shell 8

   3. Body-to-Cover Seals, Diaphragms, or Gaskets 9

   4. Stem and Plug 9

   5. Operating Mechanisms 9

   6. Glands 9

   7. Stem Seal or Packing 9

   8. Bolting 9

   9. NACE Requirements 10

   10. Identification Plate 10

7. Sealing System 10

   1. Lubricated Plug Valves 10

   2. Nonlubricated Plug Valves 10

8. Inspection, Examination, and Testing 10

   1. Inspection and Examination 10

   2. Testing 11

   3. Repair of Defects 11

9. Marking 11

10. Shipment 11

    1. Cleanliness 11

    2. Coatings 11

    3. Openings 12

    4. Plug Position 12

    5. Packing 12

    6. Packaging 12

11. Recommended Spare Parts 12

Contents

Page

Annex A (informative) Information to Be Specified by the Purchaser 13

Annex B (informative) Standard Nomenclature for Valve Parts 15

Figures

1. Parts Identification for Lubricated Plug Valve 15

2. Parts Identification for Fully-lined Plug Valve 16

3. Parts Identification for Sleeve-lined Plug Valve 17

4. Parts Identification for Nonlubricated Plug Valve 17

Tables

1 Lubricated Plug Valve Minimum Body Thickness with Valve Bodies of ASME 16.34, Group 1 Material, Millimeters (Inches) 5

Metal Plug Valves—Flanged, Threaded, and Welding Ends

1. Scope

   
   

   1. This standard specifies the requirements for quarter turn metal plug valves, including the lift plug type, for

      the petroleum, petrochemical, and industrial applications.

      
      

   2. This standard is applicable to:

      
      

      • steel, nickel base, and other alloy plug valves with flanged or butt-welding ends and ductile iron plug valves with flanged ends in sizes 15 ≤ DN ≤ 900 (1/2 ≤ NPS ≤ 36);

        
        

      • threaded or socket-welding end plug valves for sizes 15 ≤ DN ≤ 50 (1/2 ≤ NPS ≤ 2);

        
        

      • plug valve bodies conforming to ASME B16.34, which may have any combination of flanged, threaded, socket

      welding, or butt-welding ends;

      
      

      • lubricated and nonlubricated plug valves that have two-way coaxial ports.

        
        

        NOTE Three-way and four-way plug valves do not fall under the scope of this standard.

        
        

      • tandem plug valves that have two independent operating plugs in a single body.

      
      

   3. This standard covers plug valves of the nominal diameter sizes DN:

      
      

      — 15, 20, 25, 32, 40, 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 650, 700, 750, 800, 850, 900;

      
      

      corresponding to nominal pipe sizes NPS:

      
      

      — 1/2, 3/4, 1, 11/4, 11/2, 2, 21/2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24, 26, 28, 30, 32, 34, 36;

      
      

      and applies to pressure class designations:

      
      

      — 150, 300, 600, 900, 1500, 2500.

      
      

   4. This standard includes requirements for plug valves fitted with internal body, plug, and port linings or applied hard facings on the body, body ports, plug, and plug port. The extent of linings and the facing materials of which they are made are not covered in this standard.

      
      

   5. This standard also provides additional requirements for plug valves that are in full conformance to the requirements of ASME B16.34 for Standard Class 150 through 2500. Ductile iron valves and Class 150 and 300 shall follow the additional requirements of ASME B16.42 for pressure/temperature ratings, wall thickness, flange dimensions, and material grade.

      
      

   6. Plug valves covered in this standard belong to one of four general design groups that in many cases have different face-to-face and end-to-end dimensions. Some types of plug valves are not made to all patterns. The four groups of valve design are described below:

— short pattern design found only in Class 150 and 300 where flanged plug valves match the face-to-face dimensions of steel-flanged gate valves in sizes 40 ≤ DN ≤ 300 (11/2 ≤ NPS ≤ 12);

• regular pattern design with a plug port area that is greater than the venturi pattern;

  
  

• venturi pattern designed for minimum pressure loss consistent with the reduced port area used in this type of

valve. Venturi valves have a configuration of body and plug ports that approximate a venturi throat.