30. September 2014 · Comments Off · Categories: Gate valves

Body Dimensions of  Cast Steel Gate Valves

1.3.1 Flanged Ends
1.3.1.1 Body end flanges shall comply with the dimensional requirements of ASME B16.5. Unless otherwise
specified, raised face end flanges shall be provided.
1.3.1.2 Face-to-face dimensions shall be in accordance with ASME B16.10 or ISO 5752. Body end flanges and
bonnet flanges shall be cast or forged integral with the body. However, flanges may be attached by welding when
approved by the purchaser.

cast steel gate valves
1.3.1.2.1 Welding a flange to a valve body shall be by full penetration butt-welding. Unless otherwise specified,
attachment weld shall conform to ASME B31.3 or ISO 15649 for normal fluid service, including weld quality
acceptance criteria and qualifications for the weld procedure and welder or welding operator. Heat treatment shall be
performed in accordance with Table 3.
1.3.1.2.2 Integral or other alignment rings (centering backing rings) used to facilitate welding shall be removed after
the weld is completed.
1.3.2 Butt-welding Ends
1.3.2.1 Butt-welding ends for valve sizes greater than NPS 2 shall conform to the requirements of ASME B16.25 for
the bore specified for use without backing rings. Conversion of a flanged end gate valve to a butt-welding valve is not
permitted except by agreement between the purchaser and manufacturer.
1.3.2.2 End-to-end dimensions for butt-welding end class designated valves shall be in accordance with ASME
B16.10, unless otherwise specified by the purchaser.
1.3.3 Body Seats

cast steel gate valves
1.3.3.1 The inside diameter of the seat opening shall not be less than that specified in Annex A of ASME B16.34 for
the nominal pipe size and pressure class.
1.3.3.2 Integral body seats are permitted in austenitic stainless steel gate valves. When an austenitic stainless steel or a
hardfacing material is used for the body seat, this material may be weld-deposited directly on the valve body.
15.3.3.3 Where separate seat rings are provided, they shall be shoulder or bottom seated, and either threaded or
welded in place, except that for NPS < 2 (DN ≤ 50) rolled or pressed in seat rings may be used. Threaded seat rings
in ASME Class 600 or higher pressure class valves shall be seal welded.
1.3.3.4 Body seat rings shall have adequate seating area surface and shall have edges equipped with a radius or
chamfer as necessary, to prevent galling or any other damage to the disc when the valve is operated against pressure.
1.3.3.5 Sealing compounds or greases shall not be used when assembling seat rings; however, a light lubricant
having a viscosity no greater than kerosene may be used to prevent galling of mating threaded surfaces.

18. September 2014 · Comments Off · Categories: Gate valves

1.6 – BODY AND BONNET

1.6.1 – The valve body and bonnet (also the union nut in a union bonnet design) shall be made of a forging or casting material specified in the purchase order using a material specification as listed in Table 8, except that bonnet nuts, welded and threaded-and-seal-welded bonnets, and bonnets for ISRS valves (made by China gate valve manufacturer) may also be made from bar stock material. The bar stock material shall be listed in and meet the requirements of Tables 1 and 2 of ASME B16.34, including the notes, for the appropriate material group. Free machining material shall not be used.

Forged steel gate valve

1.6.2 – The minimum body wall thickness at any point, except at end connections (see 4.2.1, 4.2.2, and 4.3.1), shall not be less than the values shown in Table 3. 4.6.3The minimum bonnet wall thickness at any point below the bottom ring of backing shall not be less than the values listed in Table 3.

1.7 – BODY-BONNET JOINT

1.7.1 – The body-bonnet joint design shall be bolted, union, welded, or threaded-and-seal-welded. Bolted and threaded-and-seal-welded bonnet valve designs (designed by China valve manufacturer) shall meet the design requirements of Paragraph 6.4 of ASME B16.34.

1.7.2 – The bolted body-bonnet joint design shall have a minimum of four cap screws, studs, or stud bolts. Cap screws hall be suitable for external wrenching only.

1.7.3 – Bolting shall conform to Table 8, but other bolting combinations (not listed in Table 8) may be used by agreement between the purchaser and the manufacturer.

Forged steel gate valves

Forged steel gate valves

1.7.4 – Bolted and union body-bonnet joints shall be designed to confine the gasket and prevent over compression.

1.7.5 – Unless otherwise specified in the purchase order, the bonnet joint shall be fitted with a spiral wound gasket of Type304, 304L, 316, or 316L stainless steel winding and filler material suitable for the conditions specified in

1.7.6 – The metallic portion of the gasket exposed to the service environment shall be of a material whose corrosion resistance is at least equal to that of the shell. 4.7.6Unless otherwise specified in the purchase order, the gasket shall be suitable for the pressure rating of the valve (supplied by China valve supplier) within a valve design temperature range of –29°C (–20°F) to538°C (1000°F).

1.7.7 – Where the bonnet is welded to the body, the welding procedure and the welder or welding operator shall be qualified under the provisions of ASME B31.3. Weld quality shall conform to the acceptance standards of Paragraph 341 of ASME B31.3 for 100% visual examination for piping in Nor-mal Fluid Service. The examination shall be performed in accordance with Paragraph 344 of ASME B31.3.

1.7.8 – Bonnet welds (including seal welds) shall be post-weld heat treated in accordance with the provisions of 4.4.3.Unless otherwise specified in the purchase order, seal welds of P4 and P5 materials are exempt from post-weld heat treatment requirements if techniques and procedures are used to provide a weld hardness not to exceed 235 HB. Solution annealing of any type of bonnet weld cannot be performed and is exempt from post-weld heat treatment requirements. Valves (made by China ball valve manufacturer( with bonnet welds that have been post-weld heat treated shall have the type of post-weld heat treatment indicated on the identification plate, or on the body, or both, in accordance with 3.4. Multiple post-weld heat treat markings are not required for valves marked under 3.4.

18. September 2014 · Comments Off · Categories: Gate valves

Extensions Attached by Welding for Forged Gate Steel Valves

1.4.1 – Unless otherwise specified in the purchase order, extensions may be either integral with the valve (made by China valve manufacturer) or attached to the body by welding. When the extension is welded to the body, the welding procedure and the welder or welding opera-tor shall be qualified in accordance with ASME B31.3. Weld quality shall conform to the acceptance standards of Paragraph341 of ASME B31.3 for 100% visual examination for piping in Normal Fluid Service. The examination shall be performed in accordance with Paragraph 344 of ASME B31.3.

Forged steel gate valve

1.4.2 – Extensions may be welded to the body with full penetration groove butt welding or with inertia welding. Other welding processes may be used by agreement between the purchaser and the manufacturer. Integral centering (backing) rings used to facilitate welding shall be removed by machining after welding. There shall be no abrupt change in the internal diameter; no transition shall be more than 1 to 4, radial to axial. The final thickness of the weld shall not be less than that required for the extension by Tables 4 and 5.

1.4.3 – For all austenitic stainless steel valves, the extension-to-body attachment weld shall be solution annealed unless both the body and the extension piece are L grades or stabilized grades of stainless steel (adopted by China valve supplier). For all valves of P4 and P5materials (see note), the extension-to-body attachment weld, irrespective of the thickness of the weld joint, shall be post-weld heat treated in accordance with the requirements of ASME B31.3. For valves of P1 and P9 materials whose nominal wall thickness is greater than 19.1 millimeters (3⁄4 inch) at the weld joint, the extension-to-body attachment weld shall be post-weld heat treated in accordance with ASME B31.3. For valves of P1 and P9 materials whose nominal wall thickness is less than or equal to 19.1 millimeters (3⁄4 inch), post-weld heat treatment of the extension-to-body attachment weld is not required unless specified in the purchase order. Valves with welded extensions shall be marked as required in 3.4.

forged steel ball valves

forged steel ball valves

Note: For an explanation of P numbers, see ASME B31.3.

1.5 – BODY EXTENSION MATERIALS

Extensions to be welded to the body shall be fabricated from one of the product forms listed in Table 1, ASME B16.34 that is in the same material group, with the same nominal chemistry as the body and have an equal or greater pressure rating. When a tubular form is used it shall be of a seamless construction.

By Kevin Tsai – China ball valve manufacturer

18. September 2014 · Comments Off · Categories: Gate valves

Extension Dimensions of Forged Steel Gate Valves

1.3.1 – Table 4 shows the required dimensions for extensions without threaded ends. Table 5 shows the more restrictive requirements for extensions with threaded ends. Figure 3 illustrates the length dimensions. When the extension is intended to be socket-welded and the outside diameter of the extension exceeds the outside diameter of the corresponding pipe, the male end of the extension shall have the profile shown in Table 6. Table 7 shows comparative wall thicknesses for extensions and pipe and is for reference only.

1.3.2 – The dimensions labeled “minimum” in Tables 4 and5 are the minimum required for acceptable service. Any extension that does not meet or exceed these dimensions shall be rejected. The length of the extension is the length of the extended body from the axis of the valve stem to the outer end of the male extension (L in Figure 3). The integral backing ring shown in Table 4 is optional unless otherwise specified in the purchase order, and its length is not included in Lin Figure 3 or Table 4. The minimum distance from the hand-wheel to the end of the extension shall be 57.2 millimeters (2.25 inches), as shown in Figure 3.

1.3.3 – Threaded-end male extensions are not permitted for Class 1500 or for NPS 1⁄2 in Class 800. Threaded-end extensions shall be threaded in accordance with ASME B1.20.1.Threaded ends shall be free from tears and other visible imperfections.

Table4—Dimensions for Welded-End Connections on Class 800 and Class 1500 Extended-Body Valves (made by China valve supplier)

Extension(NPS)

Length , L(a,b)

Millimeters Inches
1/2 ≤100

105-165

170-205

≤4.0

4.1-6.5

6.6-8.0

3/4 ≤140

145-20

≤5.5

5.6-8.0

1 ≤230 ≤9.0
1-1/2 ≤230 ≤9.0
2 ≤255 ≤10.0

 

  1. The length of the operational integral backing ring is not included in the table.
  2. Extensions with lengths longer than the tabulated values are not permitted.
18. September 2014 · Comments Off · Categories: Gate valves

End Connection Specification of Forged Steel Gate Valves

1.2.1 – Threaded-end valves, as well as the female threaded ends of extended-body valves (made by China valve manufacturer), shall be internally taper-threaded as specified in ASME B1.20.1. All internal threads shall be countersunk a distance of approximately one-half the pitch of the thread at an angle of approximately 45 degrees with the axis of the thread. Countersinking shall be concentric with the threads. The minimum wall thickness of female threaded ends shall be in accordance with the Class 800 or Class 1500 requirements of Table 4 of ASME B16.34.

Forged steel gate valves

Forged steel gate valves

1.2.2 – Socket-welding-end preparation, including the female ends of extended-body valves, shall conform to ASME B16.11. The bottom of the socket shall be square and flat. The minimum wall thickness of female socket-welding ends shall be in accordance with the Class 800 or Class 1500requirements of Table 4 of ASME B16.34.  4.2.3 End flange dimensions shall conform to ASME B16.5.

1.2.4 – Flange end valves may have the flange integral with or welded to the body. When the flanges are welded to the body, the welding procedure and the welder or welding opera-tor shall be qualified under the provisions of ASME B31.3.Weld quality shall conform to the acceptance standards of Paragraph 341 of ASME B31.3 for 100% visual examination for piping in Normal Fluid Service. The examination shall be performed in accordance with Paragraph 344 of ASME B31.3. (adopted by China ball valve manufacturer)

forged steel valves

1.2.4.1 – Flanges may be welded to the body with full penetration groove butt-welding or with inertia-welding. Socket welding of flanges to the valve body is not permitted by this standard. Integral centering (backing) rings used to facilitate welding shall be removed by machining after welding. There shall be no abrupt change in the internal diameter; no transition shall be more than 1 to 4, radial to axial. The final thickness of the weld shall not be less than the body wall thickness listed in Table 3.

1.2.4.2 – All valve bodies with welded-on flanges or butt-welding stub ends (see 4.2.7) shall be post-weld heat treated in accordance with the provisions of 4.4.3 for extension-to-body attachment welds. Valves (supplied by China valve supplier)with welded-on flanges or butt-welding stub ends that have been post-weld heat treated shall have the type of post-weld heat treatment indicated on the identification plate, or stamped on the body, or both, in accordance with the requirements of 3.4.

1.2.5 – Flange end valves shall have face-to-face dimensions conforming to ASME B16.10.

1.2.6The facing finish of end flanges shall be in accordance with the requirements of ASME B16.5. When a more restrictive facing finish is required, it shall be specified on the purchase order.

Forged steel gate valve

1.2.7 – The end-to-end dimensions for Class 150, 300, 600,and 1500 butt-welding-end valves shall conform to ASMEB16.10. Butt-welding-end valves may have stub ends integral with or welded to the body. Welded stub ends shall be welded onto the body in accordance with 4.2.4.

1.2.8 – The end to end dimensions for Class 800 and Class1500 socket-welding-end and threaded-end valves  (made by China gate valve manufacturer) and for Class 800 butt-welding-end valves shall be the manufacturer’s standard.

1.2.9 – Butt-welding ends shall conform to ASME B16.25for the bore specified in the purchase order for use without backing rings.

1.2.10 – The design of integrally reinforced ends for extended-body valves shall comply with the requirements of Paragraph 304.3.2 of ASME B31.3.4.3EXTENSION DIMENSIONS 4.3.1Table 4 shows the required dimensions for extensions without threaded ends.

18. September 2014 · Comments Off · Categories: Gate valves

Marking Specifications in API 602

1.1 – Valves shall be marked in accordance with the requirements of ASME B16.34, except the identification plate may show the designation API 602 and shall include, but not be limited to, the requirements of 3.2, 3.3, and 3.4.

forged steel valves

1.2 – Valve bodies shall be marked as follows:

a. Threaded-end, socket-welding-end, or extended-body valves: 800 or 1500.

b. Flanged-end valves: 150, 300, 600, or 1500.

c. Butt-welding-end valves: 150, 300, 600, 800, or 1500.

1.3 – Each valve shall have a securely attached corrosion-resistant metal identification plate giving the following information:

a. Manufacturer (e.g. Relia valve – China valve supplier).

b. Manufacturer’s model, type, or figure number.

c. Size.

d. Applicable pressure rating at 100°F (38°C).

e. Body material.

f. Trim material.

g. Extension material when different than body.

Forged stell gate valve

1.4 – Valves made with welded extensions, stub ends, or flanges shall have “WLD” indicated on the identification plate or on the body. The material grade of each valve, along with the post-weld heat treatment conditions listed in Table 1, shall be included on the identification plate, the body or both. The “WLD” identification when indicated on the body shall be shown separately from the material marking.

Table1—Abbreviations for Post-weld Heat Treatment Conditions to be Used in Marking Valves (made by China valve manufacturer)

Condition                                   Abbreviation

Stress relieved                            SR

Solution annealed                      SA

Annealed                                        A

Normalized                                  N

Normalized/tempered            NT

Quenched/tempered               QT

Other                                               a

a  As required by the ASTM specification for the body material (adopted by Relia valve – China gate valve supplier)

17. September 2014 · Comments Off · Categories: Gate valves

Referenced Publications  in API 602 Standard

The most recent editions of the following standards, codes,and specications shall, to the extent specied, form a part ofthis standard.

API  Std 598 -Valve Inspection and Testing

API Std 600 - Steel Gate ValvesFlanged and Butt-Weld-ing Ends, Bolted and Pressure Seal Bonnets (made by China gate valve manufacturer) 

ASME

ASME B1.5 - Acme Screw Threads

ASME B1.8 - Stub Acme Screw Threads

ASME B1.20.1 - Pipe Threads, General Purpose (Inch) B16.5 Pipe Flanges and Flanged Fittings

ASME B16.10 - Face-to-Face and End-to-End Dimensionsof Valves

ASME B16.11 - Forged Fittings, Socket-Welding and Threaded

ASME B16.25 - Buttwelding Ends

ASME B16.34 - ValvesFlanged, Threaded, and WeldingEnd   

ASME B31.3 - Process Piping

ASME B36.10M - Welded and Seamless Wrought Steel Pipe

ASME B36.19M - Stainless Steel Pipe

Forged stell gate valve

ASTM A 105 - Forgings, Carbon Steel, for PipingComponents

ASTM A 182 - Forged or Rolled Alloy-Steel Pipe Flanges,Forged Fittings, and Valves and Parts for High-Temperature Service (adopted by Relia Valve – China valve supplier)

ASTM A 193 - Alloy Steel and Stainless Steel BoltingMaterials for High-Temperature Service

ASTM A 194 - Carbon and Alloy Steel Nuts for Bolts for High-Pressure and High-Temperature Service

ASTM A 216 - Steel Castings, Carbon Suitable for Fusion Welding for High-Temperature Service

ASTM A 217 - Steel Castings, Martensitic Stainless andAlloy, for Pressure-Containing Parts Suit-able for High-Temperature Service

Forged stell gate valves

ASTM A 240 - Standard Specication for Stainless andHeat Resisting Steel Plate, Sheet and Stripfor Pressure Vessels  

ASTM A 276 - Stainless and Heat-Resisting Steel Barsand Shapes

ASTM A 312 - Standard Specication for Seamless andWelded Austenitic Stainless Steel Pipes 

ASTM A 320 - Alloys-Steel Bolting Materials for Low-Temperature Service

ASTM 350 - Forgings, Carbon and Low-Alloy Steel,Requiring Notch Toughness Testing for Pip-ing Components

ASTM A 351 - Steel Castings, Austenitic, for High Temperature Service ( adopted by Relia valve- China valve manufacturer)

ASTM A 352 - Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts Suitable for Low-Temperature Service

ASTM A582 - Free-Machining Stainless and Heat-Resist-ing Steel Bars, Hot-Rolled or Cold-Finished

ASTM B 127 - Standard Specication for Nickel-CopperAlloy (UNS N04400) Plate, Sheet, and Strip 

ASTM B 165 - Standard Specication for Nickel-CopperAlloy (UNS N04400) Seamless Pipe and Tube

ASTM B 167 - Standard Specication for Nickel-Chro-mium-Iron Alloys (UNS N06600, N06601,N06690, N06025, and N06045) Seamless Pipe and Tube

ASTM B 168 - Standard Specication for Nickel-Chro-mium-Iron Alloys (UNS N06600, N06601,N06690, N06025, and N06045) and Nickel-Chromium-Cobalt-Molybdenum Alloy (UNSN06617) Plate, Sheet, and Strip  

ASTM B 443 - Standard Specication for Nickel-Chromium-Molybdenum-Columbium Alloy (UNSN06625) Plate, Sheet, and Strip  

ASTM B 473 - UNS N08020, UNS N08024, and UNSN08026 Nickel Alloy Bar and Wire.

ASTM B 575 - Standard Specication for Low-Carbon-Nickel-Molybdenum-Chromium, Low-Car-bon Nickel-Chromium-Molybdenum, and Low-Carbon Nickel-Chromium-Molybde-num-Tungsten Alloy,  Plate, Sheet, and Strip

ASTM B 622 - Standard Specication for Seamless Nickeland Nickel-Cobalt Alloy Pipe and Tube  (adopted by Relia Valve - China ball valve manufacturer)

ASTM B 670 - Standard Specication for Precipitation-Hardening Nickel Alloy (UNS N07718)Plate, Sheet, and Strip for High-Tempera-ture Service  

ASTM E 10 Test Method for Brinell Hardness of Metallic Materials

ASTM AWS 3 A5.9 - Corrosion-Resisting Chromium and Chro-mium-Nickel Steel Bare and Composite Metal Cored and Stranded Welding Elec-trodes and Welding Rods

ASTM A5.13 - Solid Surfacing Welding Rods and Electrodes.

Note:

1.  ASEME - American Society for Mechanical Engineers, 345 East 47th Street, New York, New York 10017.

2. ASTM - American Society for Testing and Materials, 100 Barr HarborDrive, West Conshohocken, Pennsylvania 19428-2959

 

Previous: Normative references in API 6D

By Kevin Tsai for Relia Valve – Valve manufacturer of ball valve and  cast steel gate valves etc.

17. September 2014 · Comments Off · Categories: BALL VALVE

 Normative references  in API 6D

The following normative documents contain provisions which, through reference in this text, constitute provisionsof this International Standard (adopted by Relia Valve – China ball valve manufacturer). For dated references, subsequent amendments to, or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below. Forundated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

NOTE  Non-International Standards may be replaced, by agreement, with other recognized and equivalent national orindustry standards.

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

ISO 148, Steel — Charpy impact test (V-notch).

valve factory

ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads—Part 1: Dimensions,tolerances and designation.

ISO 228-2, Pipe threads where pressure-tight joints are not made on the threads—Part 2: Verification bymeans of limit gauges.

ISO 5208, Industrial valves—Pressure testing of valves (made by China valve manufacturer).

ISO 7005-1, Metallic flanges—Part 1: Steel flanges.

ISO 10474, Steel and steel products—Inspection documents.

ISO 10497, Testing of valves—Fire type-testing requirements.

ISO 13623, Petroleum and natural gas industries—Pipeline transportation systems.

ASME B1.1, Unified inch screw threads (UN and UNR thread form).

ASME B1.20.1, Pipe threads, General purpose (inch).

ASME B16.5, Pipe flanges and flanged fittings—NPS 1/2 through NPS 24.

ASME B16.10, Face-to-face and end-to-end dimensions of valves(supplied by China valve supplier).

ASME B16.25:1997, Buttwelding ends.

valve experiment equipment

ASME B16.34:1996, Valves—Flanged, threaded, and welding end.

ASME B16.47, Larger diameter steel flanges—NPS 26 through NPS 60.

ASME B31.4:1992, Liquid transportation systems for hydrocarbons, liquid petroleum gas, anhydrousammonia, and alcohols.

ASME B31.8:1995, Gas transmission and distribution piping systems. ASME Boiler and Pressure Vessel Code:1998, Section V, Non destructive examination. ASME Boiler and Pressure Vessel Code:1998, Section VIII, Division 1, Rules for construction of pressurevessels. ASME Boiler and Pressure Vessel Code:1998, Section VIII, Division 2, Alternative rules for construction ofpressure vessels. ASME Boiler and Pressure Vessel Code, Section IX, Qualification standard for welding and brazing procedures,welders, brazers, and welding and brazing operators. (American Society of Mechanical Engineers, 345 East 47th Street, New York 10017-2392, USA)

ASNT SNT-TC-1A, Recommended Practice No. SNT-TC-1A. (American Society of Non-Destructive Testing, P.O. Box 28518, 1711 Arlingate Lane, Columbus, Ohio 43228-0518, USA)

ASTM A 193/A 193M, Standard specification for alloy-steel and stainless steel bolting materials for high-temperature service( such as cast steel gate valves).

ASTM A 320/A 320M, Standard specification for alloy steel bolting materials for low-temperature service.ASTM A 370, Standard test methods and definitions for mechanical testing of steel products.ASTM A 388/A 388M, Standard practice for ultrasonic examination of heavy steel forgings.

ASTM A 435/A 435M, Standard specification for straight-beam ultrasonic examination of steel plates.

ASTM A 577/A 577M, Standard specification for ultrasonic angle-beam examination of steel plates.

ASTM A 609/A 609M:1997, Standard practice for castings, carbon, low-alloy, and martensitic stainless steel,ultrasonic examination thereof. (American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania 19428-2959, USA)

AWS QC1, Standard for AWS certification of welding inspectors. (The American Welding Society, 550 NW LeJeune Road, Miami, Florida 33126, USA)

forged stainless steel ball valves

 

EN 287-1, Approval testing of welders—Fusion welding—Part 1: Steels.

EN 288-3, Specification and approval of welding procedures for metallic materials—Part 3: Welding proceduretests for the arc welding of steels.

EN 473:1993, Qualification and certification of NDT personnel—General principles. (CEN, European Committee for Standardization, Central Secretariat, Rue de Stassart 36, B-1050, Brussels, Belgium)

MSS SP-44, Steel pipeline flanges. (Manufacturers Standardization Society of the Valve & Fittings Industry Inc., 127 Park Street N.E., Vienna, Virginia 22180, USA)

NACE MR 0175, Sulfide stress cracking resistant metallic materials for oilfield equipment.(adopted by Relia Valve – China gate valve supplier)

NACE TM 0177, Laboratory testing of metals for resistance to specific forms of environmental cracking in H2Senvironments.

NACE TM 0284, Evaluation of pipeline and pressure vessel steels for resistance to hydrogen-inducedcracking. (National Association of Corrosion Engineers, P.O. Box 218340, Houston, Texas 77218, USA

16. September 2014 · Comments Off · Categories: BALL VALVE

1.1 – General

This clause specifies the quality control requirements for the manufacturing of valves (made by China valve manufacturer). The purchaser shall specify which particular supplementary NDE requirements in Annex B shall be performed.

1.2 – Measuring and test equipment

1.2.1 – General

Equipment used to inspect, test or examine material or equipment shall be identified, controlled and calibrated at intervals specified in the manufacturer’s instructions.

forged steel ball valve

forged steel ball valve (made by China ball valve manufacturer)

1.2.2 – Dimension-measuring equipment

Equipment for measuring dimensions shall be controlled and calibrated in accordance with methods specified in documented procedures. 9.2.3 Pressure-measuring devices.

1.2.3.1 – Type and accuracy

Test pressure measuring devices shall be either pressure gauges or pressure transducers which are accurate to within ±  2,0% of the full-scale reading.

1.2.3.2 – Gauge range

Pressure measurements shall be made between 25% and 75% of the full pressure range of the measuring device.

1.2.3.3 – Calibration procedure

Pressure-measuring devices shall be periodically recalibrated with a master pressure-measuring device or a deadweight tester at 25%, 50%, 75% and 100% of the full pressure scale.

trunnion plate

1.2.4 – Temperature-measuring devices

Devices for measuring temperature, if required, shall be capable of indicating and recording temperature fluctuations of 3°C (5°F).

1.3 – Qualification of inspection and test personnel

1.3.1 – NDE personnel

NDE personnel shall be qualified in accordance with the requirements specified in ASNT SNT-TC-1A or EN 473Level II as a minimum. Personnel performing visual examinations shall have passed an annual eye examination in accordance with ASNT SNT-TC-1A or EN 473 within the previous twelve months.

1.3.2 – Welding inspectors

Personnel performing visual inspection of welding operations and completed welds shall be qualified and certified to the requirements of AWS QC1, or equivalent, or a manufacturer’s documented training programme (supplied by China valve supplier).

API 6D ball valves

1.4 – NDE of repair welding

After defect removal, the excavated area shall be examined by magnetic particle (MT) or liquid penetrate (PT) methods prior to starting repair welding. Repair welds on pressure-containing parts shall be examined using MT or PT methods. Acceptance criteria shall be specified in documented procedures. The supplementary NDE requirements in Annex B, if specified by the purchaser, shall also apply to repair welding.

Previous: Welding Procedure for Pipeline Valves

 

By Kevin Tsai for Relia Valve-China gate valve supplier

16. September 2014 · Comments Off · Categories: BALL VALVE

1.1 – Qualifications Welding, including repair welding, of pressure-containing and pressure-controlling parts shall be performed in accordance with procedures qualified to ASME Section IX or EN 288−3, and 8.2 and 8.3 of this International Standard. Welders and welding operators shall be qualified in accordance with ASME Section IX or EN 287−1.

NOTE – The purchaser, pipeline design standards/codes, material specifications and local requirements may specify additional requirements. The results of all qualification tests shall be documented in a procedure qualification record (PQR).

Post-weld heat treatment (PWHT) shall be performed in accordance with the relevant material specification.

NOTE – Some pipeline-welding standards, such as BS 4515, may have more stringent requirements for the essential variables of welding. It may be necessary to provide full weld test rings, in the same heat treatment condition as the finished valve (supplied by China valve supplier), for weld procedure qualification.

pipeline valve

1.2 – Impact testing

Impact testing shall be carried out for the qualification of procedures for welding on valves with a design temperature below − 29°C (− 20°F).

NOTE – Design code and/or local requirements may require impact testing at minimum design temperatures above − 29°C (− 20°F). A set of three weld metal impact specimens shall be taken from the weld metal (WM) at the location shown in Figure 12. The specimens shall be oriented with the notch perpendicular to the surface of the material. A set of three impact specimens shall be taken from the heat-affected zone (HAZ) at the location shown in Figure 13. The notch shall be placed perpendicularly to the material surface at a location resulting in a maximum amount of HAZ material located in the resulting fracture.

HAZ tests shall be conducted for each of the materials being joined when the base materials being joined are of a different P-number and/or group number in accordance with ASME Section IX or when one or both of the base materials being joined are not listed in the P-number grouping. Impact testing shall be performed in accordance with ISO 148 or ASTM A 370 using the Charpy V-notch technique. Specimens shall be etched to determine the location of the notch. The impact test temperature for welds and heat-affected zones shall be at or below the minimum design temperature specified for the valve (made by China gate valve manufacturer). Impact test results for full-size specimens shall meet the requirements of Table 8.

pipeline valves

pipeline valves

1.3 – Hardness testing

Hardness testing shall be carried out for the qualification of procedures for welding on pressure-containing and pressure-controlling parts in valves (manufactured by China valve manufacturer) required to meet NACE MR 0175. Hardness surveys shall be performed on base metal (BM), WM and HAZ as indicated in Figure 14 using the Rockwell HRC or Vickers HV10 method.

 

By Kevin Tsai for Relia Valve – China ball valve manufacturer