1 Scope
This standard specifies the general requirements for pressure-temperature rating of power station valves, as well as materials, design, inspection, marking, package, storage, transportation and delivery documents; it also provides the guide for order requirements.
This standard is applicable to valves used for power station steam and water circuit under the following parameters and conditions:
--The nominal pressure is not greater than 42MPa and the maximum service temperature is not greater than 450℃;
--The work stress is not greater than 26MPa and the maximum service temperature is not greater than 540℃;
--The work stress is not greater than 6MPa and the maximum service temperature is not greater than 570℃;
2 Normative References
Provisions of the following documents, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this code are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document is applicable to this standard.
Contents
Foreword …I
1 Scope
2 Normative References
3 Terms and Definitions
4 Order Requirements
5 Pressure-Temperature Rating
6 Technical Requirements
6.1 General Requirements
6.2 Materials
6.3 Design
6.4 Welding
6.5 Repair welding
7 Inspection and Test
7.1 Material Inspection
7.2 Appearance Quality Inspection
7.3 Radiographic Inspection
7.4 Magnetic Particle or Penetrant Inspection
7.5 Assembling and Performance Inspection
7.6 Pressure Test
8 Marking, Package, Storage and Transportation
8.1 Marking
8.2 Package
8.3 Storage
8.4 Transportation
9 Delivery Documents
Appendix A (Informative) Order Requirements
Appendix B (Normative ) Pressure-Temperature Rating
Appendix C (Normative) The Maximum Service Temperature of Enclosure Pressure-bearing Piece Materials
Appendix D (Informative) Overlaying Materials and Hardness of Valve Seal Surface
Appendix E (Informative) Butt Weld Groove Type on the Channel Side of Valve Body
Appendix F (Informative) Metal Nameplate
Appendix G (Informative) Basic Contents of Product Qualification Certificate
Appendix H (Informative) Contents of Product Packing List
Appendix I (Informative) Main Contents of Product Installation and Operating Manual
