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Article 20: The design documents for boilers, gas cylinders, oxygen chambers, passenger cableways, and large-scale amusement facilities must be evaluated by an inspection agency approved by the department responsible for the safety supervision and management of special equipment before they can be used for manufacturing. For special equipment products, components, or newly developed special equipment products and components in the trial production stage, as well as new materials used in special equipment, if safety verification through type testing is required in accordance with the requirements of safety technical specifications, such type testing must be carried out by an inspection institution approved by the department responsible for the supervision and management of special equipment safety. Interpretation of provisions: This article sets forth the regulations regarding the appraisal of design documents and type testing for special equipment. I. Regarding the appraisal of design documents. (1) Basic concepts: Design document evaluation refers to the review of design documents and the necessary design verification activities carried out by specialized institutions approved by the regulatory authorities for special equipment. Design documents refer to design drawings, calculation sheets, instructions, etc., related to the structure, strength, materials, and safety-related functions of boilers, gas cylinders, oxygen chambers, passenger cable cars, and large-scale amusement facilities; the specific details shall be specified in the corresponding technical specifications. (II) Scope of products subject to design document evaluation Under this law, boilers, gas cylinders, oxygen chambers, passenger cable cars, and large-scale amusement facilities are included in the design document evaluation process. Boilers, gas cylinders, and oxygen chambers are standard products that are manufactured in bulk, with relatively modest design requirements ； The number of passenger ropeways and large-scale amusement rides is relatively small; however, their design conditions are complex, requiring extensive experience to ensure quality. By concentrating the design review of these special equipment in organizations with high technical expertise, extensive experience can be accumulated, the quality of the review process can be ensured, and management efficiency can be improved. (III) Design document appraisal agencies: The appraisal of design documents as stipulated in this law is carried out by inspection and testing agencies approved by the department responsible for the supervision and management of special equipment safety. These institutions shall obtain the qualification for inspecting and testing special equipment in accordance with relevant regulations, have personnel qualified to review design documents, and be recognized as authoritative bodies by society. Organizations wishing to engage in the verification of design documents should submit an application to the department responsible for the supervision and management of special equipment; upon its approval, such organizations will be listed nationwide. (IV) The contents, procedures, and acceptance criteria for the review of design documents. The contents, procedures, and acceptance criteria for the review of design documents shall be specified in the corresponding technical specifications. For example, the requirements for the design review of gas cylinders are as follows: The design documents used in the manufacture of gas cylinders must be reviewed by a professional technical institution authorized by the Boiler and Pressure Vessel Safety Supervision Agency of the General Administration for Quality Supervision, Inspection and Quarantine (hereinafter referred to as the Agency’s Safety Supervision Agency) before they can be used for manufacturing. When applying for the review of design documents, gas cylinder manufacturers shall submit all necessary design documents and product type test reports. The gas cylinder design documents shall include: 1) Design specification. 2) Design patterns (including stamp die patterns). 3) Design calculation sheet. 4) Design specification. 5) Standardization review report. 6) Instruction manual. If the material of the gas cylinder body, its design thickness, or its main structural components are changed, the manufacturer of the gas cylinder must apply again for a review of the design documents. The gas cylinder design documents shall comply with the provisions of relevant safety technical specifications, and meet the requirements of corresponding **standards (or industry standards) or enterprise standards that have been reviewed. The cylinder manufacturing standards should specify the service life of cylinders. II. Regarding type testing (I) Basic concepts. The type testing of special equipment products, components, or materials refers to a comprehensive technical review, inspection, testing, and safety performance assessment carried out by a technically authoritative institution approved by the regulatory authorities responsible for the safety supervision of special equipment, in order to determine whether the products meet the safety requirements. (II) Scope of type testing. The specific scope of the type test is specified in the safety technical specifications. There are 3 situations in which type testing is required: first, for newly developed products that are introduced to the market for the first time or imported products that are used in the country for the first time ； The second is one that is manufactured by a company for the first time ； Third, the standards stipulate that it be carried out on schedule. The manufacturing processes, resource capabilities, and quality management standards of the units that produce materials for special equipment determine the safety performance of their products. Since the quality of materials used in special equipment is directly related to the safety performance of such equipment, it is necessary to require that manufacturers of these materials conduct type tests whenever they produce materials of a certain type or grade for the first time, in order to verify their ability to manufacture materials that meet safety requirements. The manufacturing unit may proceed with material production only after passing the type test, thereby ensuring that the properties of the materials used in special equipment meet the relevant requirements. (III) Type testing institutions. The type testing required by this law shall be carried out by type testers approved by the department responsible for the safety supervision and management of special equipment. These institutions shall obtain the qualification for type testing of special equipment in accordance with relevant regulations, possess the necessary experimental facilities and personnel, and be recognized as authoritative bodies by society. Institutions wishing to conduct type tests should submit an application to the department in charge of safety supervision and management of special equipment under the State Council; upon approval by this department, their names will be made public nationwide. The departments responsible for the safety supervision and management of special equipment shall determine the type testing institutions based on the technical characteristics of various types of special equipment, their quantities, and the distribution of manufacturers. These decisions should be made in accordance with the principles of overall quantity control, convenience for enterprises, full utilization of regional resources or industry advantages, rational planning, and scaling up. (IV) The scope, items, acceptance criteria, procedures, etc. of the type test. The type testing institution shall conduct tests in accordance with relevant safety technical specifications and standards, and issue a type test report for those that meet the requirements. The scope of type testing, inspection and testing items, acceptance criteria, testing procedures, report format, and the use of test results shall be specified in the safety technical specifications. The type test shall be submitted by the manufacturer or its agent to a qualified type testing laboratory. Products that have not applied for type testing or have failed type testing shall not be put into manufacture or use.