Detail of DL 647-2004

Introduction of DL 647-2004

1 Scope This Standard specifies the inspection contents and corresponding requirements of boiler, thermodynamic system pressure vessel, and main steam/water piping in thermal power plant during the stages of equipment manufacture, installation and service. This Standard is applicable to the power boiler, thermodynamic system pressure vessel in thermal power plant and main steam/water piping whose rated steam pressure is greater than or equal to 3.8 MPa. Boiler, thermodynamic system pressure vessel and main steam/water piping in thermal power plant whose rated steam pressure is less than 3.8 MPa may make reference to this Standard. This Standard is applicable to the inspection of components in the following scope: a) Pressure element, component and its connecting piece of boiler body; b) Piping within the scope of boiler; c) Safety protective device and instrument of boiler; d) Main bearing structure of boiler; e) Thermodynamic system pressure vessels such as high-pressure and low-pressure heater, pressure-type deaerator and expanding devices; f) Pressure piping such as main steam piping, high-temperature and low-temperature reheated steam piping, main water supply piping, high-pressure and low-pressure bypass piping. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies. GB 150 Steel pressure vessels GB 151 Tubular Heat Exchangers GB/T 12145 Generating unit and steam power equipment quality standards for water vapor GB 50205 Code for Acceptance of Construction Quality of Steel Structures DL/T 441 Supervision code for creep strain of steam pipe in high temperature and high pressure in fossil fuel power plant DL/T 515 Pipe Bends for Power Station DL/T 561 Guide for Chemical Supervision of Water and Steam in Thermal Power Plants DL 612 Supervision Code for Boiler and Pressure Vessel of the Power Industry DL/T 616 Maintenance & Adjusting Guide for the Thermal Power Plant Steam-Water Piping and Support-Hangers DL/T 677 Checking and calibration code for on-line chemical analysis instrument of fossil fuel power plant DL/T 794 Chemical cleaning guide for steam power plant DL/T 820 The code of ultrasonic inspection section for butt welds of pipes DL/T 821 The Code of Radiographic Examination of Butt Welded-Joints of Pressure Steels Pipes and Tubes DL/T 869 The Code of the Welding for Power Plant D L 5031—1994 The code of erection and acceptance for electric power construction piping section DL/T 5047 The code of Erection and Acceptance of Electric Power Construction Section of Steam Boiler Set DL/T 5054 Code for Design of Thermal Power Plant Steam/Water Piping DL/T 5190.5 The specification of erection and acceptance of electric power constrution-Part5: Section of instrumentation and control JB/T 1609 Specifications for Manufacturing of Boiler and Boiler Barrel JB 3375 Receiving Acceptance of Materials for Boiler Construction SDJJ 03-1988 Guide of chemistry supervision of thermal equipments for power station capital construction Shui Dian Dian Sheng Zi [83] No.47 of the Ministry of Water Resources and Electric Power Rules for operating and maintenance of high pressure heater in thermal power plant Neng Yuan An Bao [1991] No.709 of the Ministry of Energy and Mechanical & Electrical Department Code of safety of pressure-type deaerator in thermal power plant Dian An Sheng [1994] No.227 of the Ministry of Electric Power Working Regulation of Power Safety Guo Fa [1999] No.154 of the Bureau of Quality and Technical Supervision Supervision Regulation on Safety Technology for Pressure Vessel 3 General Provisions 3.1 This Standard is formulated with a view to strengthening the safety performance supervision and inspection (hereinafter referred to as supervision inspection) in the manufacture and installation stage and periodical inspection in the in-service stage of boiler, thermodynamic system pressure vessel and main steam/water piping in thermal power plant. 3.2 This Standard specifies the inspection items, requirements, methods, procedures, personnel qualifications, quality standards, inspection period, records retention, report form, safety condition rating, and conclusion and treatment suggestions for the equipment within its application scope during the stages of manufacture, installation and service. The provisions shall be enforced strictly during the process of relevant design, manufacture, installation, debugging, operation, repair, renovation and inspection. 3.3 The organization engaged in boiler and pressure vessel inspection in thermal power plant (hereinafter referred to as boiler inspection organization) shall obtain the inspection qualification of the national and electric power industry according to the corresponding requirements of the national and electric power industry. 3.4 The personnel engaged in boiler and pressure vessel inspection in thermal power plant shall obtain the inspection qualification certificates of the national and electric power industry according to the corresponding requirements of the national and electric power industry. 3.5 The regulations, codes and standards on which the boiler, pressure vessel and pressure piping are based in the inspection during the stage of manufacture, installation and service shall meet the provisions of the national and electric power industry and the requirements of the regulations, standards and codes designated in the contract.

Contents of DL 647-2004

Foreword i 1 Scope 2 Normative References 3 General Provisions 4 Supervision and Inspection of Boiler Manufacture Quality 5 Supervision and Inspection of Boiler Installation Quality 6 Periodical Inspection of In-Service Boiler 7 Supervision and Inspection of Pressure Vessel Manufacture Quality 8 Supervision and Inspection of Pressure Vessel Installation Quality 9 Periodical Inspection of In-Service Pressure Vessel 10 Supervision and Inspection of Pressure Piping Element Manufacture Quality 11 Supervision and Inspection of Pressure Piping Installation Quality 12 Periodical Inspection of In-Service Pressure Piping 13 Inspection of Safety Accessories and Protective Devices Appendix A (Informative) Inspection Report Form of the Pressure Piping of Boiler Pressure Vessel Appendix B (Normative) Grade Evaluation on Safety Condition of Boiler and Pressure Vessel and Pressure Piping Appendix C (Informative) General Requirements of Replacement of Boiler Pressure Components