ASME B16.3-2011

(Revision of ASME B16.3-2006)

Malleable Iron Threaded Fittings

Classes 150 and 300

AN A MERICAN NA TIONAL S T AND ARD

ASME B16.3-2011

(Revision of ASME B16.3-2006)

ASME B16.3-2011

(Revision of ASME B16.3-2006)

Malleable Iron Threaded Fittings

Classes 150 and 300

AN AMERICAN NA TIONAL S T AND ARD

Three Park Avenue • New York, NY • 10016 USA

Date of Issuance: October 10, 2011

The next edition of this Standard is scheduled for publication in 2016.

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The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990

Copyright © 2011 by

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

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CONTENTS

Foreword iv

Committee Roster vi

Correspondence With the B16 Committee vii

Summary of Changes viii

1. Scope 1

2. General 1

3. Pressure–Temperature Ratings 1

4. Size 2

5. Marking 2

6. Material 2

7. Dimensions and Tolerances 2

8. Threading 3

9. Ribs 3

10. Plugs, Bushings, and Locknuts 3

11. Face Bevel 3

12. Coatings 3

Figures

1. Identification of Reducing Fittings 2

2. Gaging of Chamfered Internal Threads 3

Tables

1. Pressure–Temperature Ratings 5

2. Inspection Tolerances 5

3. Dimensions of Class 150, 90-deg Elbows, Tees, and Crosses, and 45-deg Elbows

   (Straight Sizes) 6

4. Dimensions of Class 150, 90-deg Elbows and Crosses (Reducing Sizes) 7

5. Dimensions of Class 150 Tees (Reducing Sizes) 8

6. Dimensions of Class 150, 45-deg Y-Branches (Straight Sizes) 9

7. Dimensions of Class 150 Street Tees and 90-deg and 45-deg Street Elbows 10

8. Dimensions of Class 150 Couplings (Straight and Reducing Sizes) 11

9. Dimensions of Class 150 Caps 12

10. Dimensions of Class 150, Closed-, Medium-, and Open-Pattern Return Bends 13

11. Dimensions of Class 300, 90-deg Elbows, Tees, and Crosses, and 45-deg Elbows

    (Straight Sizes) 14

12. Center-to-End Dimensions of Class 300, 90-deg Elbows (Reducing Sizes) 14

13. Center-to-End Dimensions of Class 300 Tees (Reducing Sizes) 15

14. Dimensions of Class 300 Couplings 16

15. Dimensions of Class 300 Reducing Couplings 17

16. Dimensions of Class 300 Caps 18

17. Dimensions of Class 300, 90-deg and 45-deg Street Elbows 19

18. Dimensions of Class 300 Return Bends 19

    Mandatory Appendices

    1. Dimensions of Fittings in U.S. Customary Units 21

    2. References 38

Nonmandatory Appendix

A Quality System Program 39

iii