Steel Gate, Globe, and Check Valves for Sizes NPS 4 (DN 100) and Smaller for the Petroleum and Natural Gas Industries

Downstream Segment

API STANDARD 602

NINTH EDITION, OCTOBER 2009 EFFECTIVE DATE: APRIL 1, 2010

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Copyright © 2009 American Petroleum Institute

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iii

Contents

Page

1. Scope 1

2. Normative References 2

3. Terms and Definitions 3

4. Pressure/Temperature Ratings 4

   1. Valve Ratings 4

   2. Temperature Constraints 7

5. Design 10

   1. Reference Design 10

   2. Flow Passageway 10

   3. Wall Thickness 11

   4. Valve Body 11

   5. Valve Bonnet or Cover 16

   6. Wedge or Disc 17

   7. Stem 18

   8. Stem Nut or Stem Bushing 19

   9. Packing, Packing Chamber, and Gland 20

   10. Packing Retention 20

   11. Handwheel 21

6. Materials 21

   1. Trim Materials 21

   2. Materials Other Than Trim 24

7. Marking 24

   1. Legibility 24

   2. Body Marking 24

   3. Ring Joint Groove Marking 24

   4. Identification Plate Marking 25

   5. Weld Fabrication Marking 25

8. Testing and Inspection 25

   1. Pressure Tests 25

   2. Inspection 25

9. Preparation for Dispatch 26

Annex A (normative) Requirements for Extended Body Gate Valve Bodies 27

Annex B (normative) Requirements for Valves with Bellows Stem Seals 31

Annex C (normative) Type Testing of Bellows Stem Seals 35

Annex D (informative) Identification of Valve Parts 38

Annex E (informative) Information to be Specified by the Purchaser 45

Annex F (informative) Valve Material Combinations 47

Figures

1 Butt-welding Ends 15

1. Threaded End Extension for Class 800 28

2. Welding End Extension for Class 800 and 1500 29

   v

   Page

3. Socket Welding End Preparation for Class 800 and Class 1500 29

1. Outside Screw and Yoke Bolted Bonnet Gate Valve 38

2. Inside Screw Gate Valve 39

3. Bellows Stem Seal Gate Valve 40

4. Welded Bonnet Gate Valve 41

5. Outside Screw and Yoke Globe Valve 42

6. Union Bonnet Globe Valve 43

7. Piston Check Valve 44

8. Ball Check Valve 44

Tables

1 ASME B16.34 Material Group 1 and Material Group 2 Forging and Casting Descriptions 5

2a 800 Class Pressure/Temperature Ratings (USC Units) 6

2b 800 Class Pressure/Temperature Ratings (SI Units) 8

1. Minimum Diameter of Equivalent Flow Passageway for Standard a Bore Valves 10

2. Minimum Diameter of Equivalent Flow Passageway for Full-bore Valves 11

3. Minimum Wall Thickness for Valve Bodies, Bonnets, and Check Valve Covers 12

4. Minimum Wall Thickness for Bonnet Extensions and Bellows Enclosures 12

5. Butt-welding End Diameters 15

6. Wear Travel for Gate Valves 17

7. Minimum Stem Diameter for Standard Bore Valves 18

8. Minimum Stem Diameter for Full-bore Valves 19

9. Minimum Uncompressed Packing Height 20

10. Nominal Seating Surfaces, Stem, or Weld-deposit Materials and Hardness 22

11. Alternative CNs 23

12. Materials for Valve Parts Other Than Trim Items 23

1. Threaded End Extension for Class 800 27

2. Welding End Extension for Class 800 and Class 1500 28

3. Socket Welding End Preparation for Class 800 and Class 1500 30

4. Postweld Heat Treatment 30

B.1 Bellows Material Chart 33

C.1 Bellows Test Cycles 36

1. Material Combinations for Group 1 Body, Bonnet, and Cover Materials 48

2. Material Combinations for Group 2 Body to Bonnet Materials 49

3. Substitute Body to Bonnet Bolting Materials 50

vi

Steel Gate, Globe, and Check Valves for Sizes NPS 4 (DN 100) and Smaller for the Petroleum and Natural Gas Industries

1 Scope

This international standard specifies the requirements for a series of compact steel gate, globe and check valves for petroleum and natural gas industry applications.

It is applicable to valves of:

• nominal pipe sizes NPS 1/4, NPS 3/8, NPS 1/2, NPS 3/4, NPS 1, NPS 1 1/4, NPS 1 1/2, NPS 2, NPS 2 1/2, NPS 3,

  and NPS 4;

  
  

• corresponding to nominal sizes DN 8, DN 10, DN 15, DN 20, DN 25, DN 32, DN 40, DN 50, DN 65, DN 80, and

DN 100.

It is also applicable to pressure designations of Class 150, Class 300, Class 600, Class 800 and Class 1500.

Class 800 is not a listed class designation, but is an intermediate class number widely used for socket welding and threaded end compact valves.

It includes provisions for the following valve characteristics.

• Outside screw with rising stems (OS & Y), in sizes 1/4  NPS  4 (8  DN  100) and pressure designations including Class 800.

  
  

• Inside screw with rising stems (ISRS), in sizes 1/4  NPS  2 1/2 (8  DN  65) and pressure designations of classes  800.

  
  

• Socket welding or threaded ends, in sizes 1/4  NPS  2 1/2 (8  DN  65) and pressure designations of Class 800 and Class 1500.

  
  

• Flanged or butt-welding ends, in sizes 1/2  NPS  4 (15  DN  100) and pressure designations of Class 150 through Class 1500, excluding flanged end Class 800.

  
  

• Bonnet Joint Construction—Bolted, welded and threaded with seal weld for classes  1500 and union nut for classes  800.

  
  

• Standard and full-bore body seat openings.

  
  

• Materials, as specified.

  
  

• Testing and inspection.

This publication is applicable to valve end flanges in accordance with ASME B16.5, valve body ends having tapered pipe threads to ASME B1.20.1 or ISO 7-1, valve body ends having socket weld ends to ASME B16.11 and butt-weld connections per the requirements described within this standard. It is applicable to extended body construction in sizes 1/2  NPS  2 (15  DN  50) and pressure designations of Class 800 and Class 1500, and to bellows and bellows assembly construction as may be adaptable to gate or globe valves in sizes 1/4  NPS  2 (8  DN  50). It covers bellows stem seal type testing requirements.

1

2 API STANDARD 602

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

API Standard 598, Valve Inspection and Testing

ASME B1.1 1, Unified Inch Screw Threads (UN and UNR Thread Form)

ASME B1.5, Acme Screw Threads

ASME B1.8, Stub Acme Screw Threads

ASME B1.13M, Metric Screw Threads: M Profile ASME B1.20.1, Pipe Threads, General Purpose (Inch) ASME B16.5, Pipe Flanges and Flanged Fittings

ASME B16.10, Face-to-Face and End-to-End Dimensions of Valves ASME B16.11, Forged Fittings, Socket-welding and Threaded ASME B16.34, Valves—Flanged, Threaded, and Welding End ASME B31.3, Process Piping

ASME Boiler and Pressure Vessel Code (BPVC), Section IX: Welding and Brazing Qualifications

ASTM A193 2, Standard Specification for Alloy-steel and Stainless Steel Bolting Materials for High-temperature Service

ASTM A194, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure and High- Temperature Service, or Both

ASTM A307, Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength

EN 10269 3, Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

ISO 7-1 4, Pipe threads where pressure-tight joints are made on the threads—Part 1: Dimensions, tolerances and designation

ISO 7-2, Pipe threads where pressure-tight joints are made on the threads—Part 2: Verification by means of limit gauges

ISO 2902, ISO metric trapezoidal screw threads—General plan

1. ASME International, 3 Park Avenue, New York, New York 10016, www.asme.org.

2. ASTM International, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania 19428, www.astm.org.

3. European Committee for Standardization, Avenue Marnix 17, B-1000, Brussels, Belgium, www.cen.eu.

4. International Organization for Standardization, 1, ch. de la Voie-Creuse, Case postale 56, CH-1211, Geneva, Switzerland, www.iso.org.