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Quality and technical supervision bureaus of all provinces, autonomous regions and municipalities directly under the Central Government: "Measures for the Supervision and Administration of the Manufacturing of Boilers and Pressure Vessels" ( * * General Administration of Quality Supervision, Inspection and Quarantine Order No. 22, hereinafter referred to as the "Supervision and Management Measures") and "Boiler and Pressure Vessel Manufacturing Licensing Conditions" (National Quality Inspection Pot [2003] No. 194, hereinafter referred to as the "Licensing Conditions") have been implemented since January 1, 2003 and January 1, 2004 respectively. Various localities have reported some problems encountered during the implementation process. In order to better implement the "Supervision and Administration Measures" and "Licensing Conditions", actively promote the reform of administrative licensing, and standardize the management of boiler and pressure vessel manufacturing licenses, the following opinions on relevant issues are hereby provided. Please comply with them. 1. Regarding the manufacturing of pressure vessel shells. Pressure vessel shells are the main pressure components of pressure vessel products. Pressure vessel manufacturing units should have the ability to produce shells and generally are not allowed to entrust other units to process them. However, for pressure vessel shells without longitudinal welds such as forging and casting, pressure vessel manufacturing units are allowed to entrust units with corresponding production conditions to process them. The pressure vessel manufacturing unit shall evaluate the production conditions and quality assurance measures of the entrusted unit in accordance with the requirements of the unit's pressure vessel quality assurance system. The quality of the pressure vessel shells entrusted to be processed is the responsibility of the entrusting unit, which mainly includes shell geometric dimensions, chemical composition, mechanical properties, impact test results (when required) and non-destructive testing results, etc. For accumulator assembly enterprises without the ability to manufacture accumulator shells, the corresponding pressure vessel manufacturing license will not be issued. They are allowed to purchase accumulator shells from units with corresponding manufacturing qualifications for assembly, but the name and license number of the accumulator shell manufacturing unit must be indicated on the accumulator products. 2. Regarding the manufacturing of boiler components (1) Class A boiler components. Class A boiler components refer to pressure-bearing components used on steam boilers (including waste heat boilers) with a rated outlet steam pressure greater than 2.5MPa, including drums, membrane walls, boiler economizers, boiler superheaters, boiler reheaters and headers, etc. The manufacturing unit of the above products must obtain the corresponding Class A boiler component manufacturing license. According to Article 10 of the "Licensing Conditions", the manufacturing licensing resource conditions for Class A boiler components shall be implemented with reference to the manufacturing licensing conditions for the corresponding parts of Class A boilers. Among them, the basic conditions should meet the requirements specified in Section 1 of Chapter 2 of the "Licensing Conditions", and the special conditions shall be implemented as follows:: 1． Technical strength requirements. Follow the requirements of Article 11 of the "Licensing Conditions". Among them, for companies that manufacture parts other than drums, non-destructive testing personnel are not required to be equipped with senior RT and UT personnel. 2． Manufacturing equipment and tooling requirements. For drum manufacturing units, the requirements for drums in Article 11 of the "Licensing Conditions" should be implemented. Among them, water (oil) pressure equipment and heat treatment equipment manufacturing units can subcontract on the premise of ensuring quality. ； For membrane wall manufacturing units, they should have special membrane wall manufacturing equipment including multi-head automatic welding equipment, rows of bending and flattening equipment, flat steel finishing equipment, etc. ； For boiler economizers, boiler superheaters and boiler reheater manufacturing units, they should have pipe butt welding equipment including automatic hot wire TIG or TIG plus MIG and necessary argon arc welding machines, pipe end forming and chamfering equipment, bevel processing equipment, pipe bending, cutting and pipe racks and other manufacturing equipment and tooling. ； For boiler pressure pipes and headers manufacturing units, they should have necessary manufacturing equipment such as cutting, pipe bending, gas shielded welding and arc welding equipment, automatic circumferential submerged arc welding (applicable to manufacturing headers), preheating and heat treatment equipment (can be subcontracted). 3. Inspection and test equipment. In accordance with the relevant provisions of Article 11 of the "Licensing Conditions", units that manufacture alloy steel products should have spectral detection equipment. (2) Pipes (components) within the boiler body. For pressure-bearing pipes (pieces) in the boiler body, such as elbows, tees, water supply pipes, steam-water connecting pipes, main steam pipes, reheat steam pipes, convection pipes, centralized downcomers, etc., if the manufacturing unit has obtained * * The Class A manufacturing license for the first group of pressure piping components issued by the General Administration of Quality Supervision, Inspection and Quarantine does not require a separate manufacturing license for boiler components. (3) Cast iron economizer. Foundries that only produce cast iron sheets without processing and assembling them into economizer parts do not need to obtain a boiler parts manufacturing license. (4) Other boiler components. Boiler components such as the boiler furnace (including furnace expansion joints), lower leg rings, tube sheets, etc. can be manufactured by units that have obtained the head manufacturing license. ； Units that only engage in the molding of furnace bladders, lower leg rings and threaded smoke tubes do not need to obtain a boiler parts manufacturing license. 3. On-site manufacturing (assembly and welding) of large pressure vessels Large pressure vessels refer to pressure vessels that need to be manufactured (assembly and welded) on site due to equipment weight or transportation road restrictions. Specifically divided into two categories: The first type requires the final girth weld welding work to be completed on site. This type of pressure vessel can have the equipment manufacturing unit go to the site to complete the final girth weld welding work, or it can entrust a unit with corresponding pressure vessel manufacturing qualifications or a unit with A3 grade pressure vessel manufacturing license qualification to complete the final girth weld welding work. ； The other type is pressure vessels that need to be assembled and welded in pieces on site. The unit that implements on-site assembly and welding of pressure vessels should have an A3 grade pressure vessel manufacturing license. For pressure vessels that need to be fabricated (assembled and welded) on site, the manufacturing unit shall notify in writing the quality and technical supervision department of the municipality or districted city where the equipment is installed before implementing on-site manufacturing (assembly welding), and accept the supervision and inspection of the approved inspection and testing agency at the place where the equipment is installed in accordance with the principle of territorial management. 4. Regarding the manufacturing basis of the head * * According to the requirements of the "Special Equipment Catalog" (National Quality Inspection Pot No. 31) published by the General Administration of Quality Supervision, Inspection and Quarantine on January 19, 2004, units that produce boiler and pressure vessel heads must obtain corresponding manufacturing qualifications. In view of the fact that most boiler and pressure vessel head manufacturers have obtained corresponding manufacturing licenses, in order to further standardize this work, any unit that has not obtained a head manufacturing license is not allowed to produce heads for boiler and pressure vessels. Those who violate the regulations will be punished in accordance with Article 67 of the "Special Equipment Safety Supervision Regulations". Units that have obtained the corresponding boiler and pressure vessel manufacturing license do not need to obtain another head manufacturing license. 5. Units that assemble gas cylinder containers with a total volume of greater than or equal to 1 cubic meter should obtain a C3 level (limited to assembled gas cylinder containers) manufacturing license. The basic conditions for manufacturing license of C3 level (limited to assembled gas cylinder containers) are:: 1． A quality management system should be established, quality control documents and management systems should be formulated, and the effective operation of the quality system should be ensured. 2． There should be a workshop to produce and meet the needs of assembling gas cylinder containers. 3． Gas cylinder containers should pass relevant inspections by China Classification Society. 4． The pressure resistance and air tightness test equipment required for assembling gas cylinder containers should be available. 5. There should be professional technicians and operators, the number of which should be no less than 3. Units that have obtained a B1 level (seamless gas cylinder) manufacturing license do not need to obtain a C3 level (assembly-only gas cylinder container) manufacturing license, but the gas cylinder container must pass relevant inspections by China Classification Society and submit the inspection report to the licensing department for record. 6. Other management work regarding boiler and pressure vessel manufacturing licenses (1) Restrictions on the scope of pressure vessel manufacturing varieties. 1． For high-pressure vessels in the A1-class pressure vessel manufacturing license, only single-layer high-pressure or multi-layer high-pressure vessels need to be indicated. 2． For A3 class pressure vessel manufacturing license, if not specified, it is the qualification for on-site assembly and welding of spherical vessels. ； If only the spherical shell plate or head is pressed, please indicate "Only pressing the spherical shell plate" or "Only pressing the head."” ； If you are qualified for on-site assembly and welding of spherical vessels and qualified for spherical shell plate or head pressing, please indicate "including spherical shell plate pressing" or "including head pressing". 3． For the A4 class pressure vessel manufacturing license, it should be noted that "graphite containers only", "fiber-wound containers only" or "plastic containers only". (2) Increase boiler and pressure vessel production locations. 1． If a boiler and pressure vessel manufacturing unit (with the same unit name) adds a production location for boiler and pressure vessel products other than the approved manufacturing address due to expansion of production capacity or other reasons, it shall submit an application to the licensing department. After acceptance, an appraisal and evaluation agency can be invited to review the conditions of the newly added production site. After passing the review, the licensing department will include the name, address, license level and variety range of the new production place into its main factory (company) manufacturing license, and no additional manufacturing license will be issued to the new production place. 2． For boiler and pressure vessel application units affiliated to the main factory (company) with business licenses or independent legal person qualifications, they can apply for corresponding manufacturing licenses individually based on their respective conditions in accordance with the "Supervision and Management Measures", "Licensing Conditions" and "Boiler and Pressure Vessel Manufacturing Licensing Work Procedures". If the certificate is not obtained separately, the main factory (company) shall submit an application to the certification department and handle it in accordance with the provisions of the preceding paragraph. (3) Change of manufacturing location. According to Article 20 of the "Supervision and Administration Measures", when a boiler and pressure vessel manufacturing unit changes its production site, it must fill out the "Application Form for Change of Special Equipment License (Approval) Certificate" and submit an application to the licensing department. After acceptance, an appraisal and evaluation agency will be invited to conduct a confirmation review. After it is confirmed that the review is passed, the change of manufacturing license will be processed. Boiler and pressure vessel manufacturing units should generally stop production activities of boiler and pressure vessel products during the relocation process. In principle, they are not allowed to produce while relocating. (4) The validity period of the boiler and pressure vessel manufacturing license. The boiler and pressure vessel manufacturing license is valid for 4 years. For those who are upgraded from D to A, B or C during the validity period of the original license, the validity period of the license will be calculated based on the date of the new license after the upgrade. ； For newly added license levels or varieties within the scope of the original manufacturing license, the validity period of the license will still be calculated based on the original issuance date. 6. Provisions on Trial Products The trial products mentioned in Article 10 of the "Supervision and Administration Measures" refer to the representative products or their main components of the license level applied for by the applicant. 7. Modifications to individual clauses of the "Licensing Conditions" (1) The design safety factors of cast steel pressure vessels in Table 1 of Article 54 are selected from the following table: Condition material lower limit of tensile strength σb Yield limit at design temperature Durable strength at design temperature (average) Creep limit at design temperature (average) Design temperature of cast steel ≤ 300℃ nb ≥ 4.0 / Casting coefficient / / / Design temperature > 300℃ (Note 1) nb≥4.0/casting coefficient ns≥1.5/casting coefficient/ / Note 1: For cast steel vessels with a design temperature greater than 300°C, the allowable stress should be considered respectively in nb and ns, and the smaller value of the two calculation results should be taken. (2) In paragraph (4) of Article 55, the welding crack sensitivity coefficient Pcm value of high-strength tempered steel shall meet the following requirements: 540Mpa≤σb (Note 2)≤570Mpa, Pcm≤0.25% ； 570Mpa＜σb≤610 Mpa, Pcm≤0.28% ； σb＞610Mpa, Pcm≤0.30%. Note 2: σb is the lower limit of normal temperature tensile strength specified in steel standards. (3) Article 55, paragraph (5). For steel plates used in mobile pressure vessel tanks, two steel plates should be selected from each batch for impact testing. The test temperature is -20°C or as specified in the drawing. The impact test requirements and impact toughness qualification indicators are as specified in Table 3. Keywords for April 13, 2005: Copy of Boiler and Pressure Vessel Licensing Management Opinions: General Office, Special Equipment Bureau, archive (2). * * The General Office of the General Administration of Quality Supervision, Inspection and Quarantine issued the entry on April 14, 2005: Proofreading by Shen Shilan: Zhang Jianrong