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Notice from the General Office of the State Administration for Market Regulation on Requirements for Standardizing Safety Technologies Related to Pressure Vessels, Document No. SJTSE [2019] 195: To the market regulation bureaus (departments, commissions) of all provinces, autonomous regions, municipalities directly under the Central Government, and the Xinjiang Production and Construction Corps: In light of the new situations and problems that have emerged in the safety supervision of pressure vessels (including gas cylinders) recently, and with a view to further improving such supervision, the relevant safety technology requirements are hereby notified as follows: 1. Use of strain strengthening technology in the manufacture of cryogenic pressure vessels (i) Regarding product standards and related requirements. 1. Cryogenic pressure vessels refer to pressure vessels used for storing or transporting cryogenically liquefied gases. The manufacture of fixed cryogenic pressure vessels using strain strengthening technology shall be carried out in accordance with the requirements of GB/T 18442.7-2017 \"Fixed vacuum-insulated cryogenic pressure vessels – Part 7: Specifications for strain strengthening of inner vessels\". Mobile cryogenic pressure vessels manufactured using strain strengthening technology shall, prior to the issuance of the corresponding standards, meet manufacturing technical requirements that are no less stringent than those specified in Standard T/CATSI 05001-2018 \"Technical Requirements for Strain Strengthening of Inner Vessels in Mobile Vacuum Insulated Cryogenic Pressure Vessels\" (download address: http://www.cdstc.org.cn). 2. The manufacturing unit may formulate its own enterprise standards for producing cryogenic pressure vessels using strain strengthening technology and make such declarations on its own, provided that the technical requirements meet or exceed those specified in GB/T 18442.7-2017 and T/CATSI 05001-2018 respectively. 3. For cryogenic pressure vessels manufactured using strain strengthening technology, the design documents and delivery documents shall indicate “strain strengthened vessel”, and the product nameplate shall bear the “PS” mark. 4. The supervision and inspection agency shall conduct on-site supervision and verification of the strain strengthening process and results, and sign the strain strengthening treatment report. (II) Regarding type testing. 1. The entity that manufactures cryogenic pressure vessels using strain strengthening technology for the first time shall engage a qualified type testing institution to conduct type testing on the cryogenic vessels. The type test consists of two parts: a verification test for the strain strengthening process of the inner container, and a test on the low-temperature performance of the vacuum-insulated tank. 2. Before manufacturing the inner vessel of a cryogenic pressure vessel using strain strengthening technology, the manufacturer should first produce sample vessels and verify the strain strengthening process on those sample vessels. The type test laboratory shall verify on-site the process of strain strengthening validation and sign the report. A supervision and inspection agency should be invited to witness the trial production process on site. 3. For those that pass the type test, the type testing institution shall issue a \"Type Test Certificate\" and upload it for public display; the Type Test Certificate shall specify the scope covered by the certificate as well as its validity period. (III) Regarding the conversion of type test certificates. 1. For manufacturing units that had already passed the technical evaluation for strain-strengthened cryogenic pressure vessels prior to the issuance of this notice and for which more than 4 years have not elapsed, they shall compare their original welding procedure qualifications, sample vessel testing items, and relevant technical specifications with GB/T18442.7-2017 or T/CATSI 05001-2018 to prepare a comparison report, and submit it to a qualified type testing institution by June 1, 2019. Once approved by the type testing institution, it will be converted into a “Type Test Certificate”. 2. Manufacturing units with over 4 years of experience shall carry out compliance comparisons in accordance with the above requirements, prepare comparison reports, and engage a type testing institution. This institution will randomly select products to witness the on-site strain strengthening process and conduct low-temperature performance tests; upon successful completion, a \"Type Test Certificate\" will be issued. Otherwise, the type tests must be repeated. (IV) Regarding information collection. 1. The manufacturing unit shall, in accordance with the data collection procedures and requirements (download address: http://www.cdstc.org.cn), upload the data related to strain strengthening treatment in real time via the data collection terminal to the National Strain Strengthening Cryogenic Vessel Information Service Platform (hereinafter referred to as the Platform, address: http://sh.tpvms.org). Supervision and inspection agencies shall not issue supervision and inspection certificates for devices that have failed to upload the relevant data as required. The type test institution is responsible for regularly analyzing and managing the strain strengthening data and results uploaded to the platform by the manufacturing units, and uses the results of these analyses as a basis for determining exemptions from subsequent type tests. 3. The type testing institution shall also conduct random inspections on the operation of the quality management systems of manufacturing units that have already obtained the Type Testing Certificate, on the performance of personnel responsible for quality management in their roles, and on the submission of data related to strain strengthening treatments. For manufacturing units that seriously violate standard requirements and are unable to ensure the quality of the strain strengthening process, the type testing institution may revoke the Type Testing Certificate issued to them and report such violations to the Special Equipment Bureau of the State Administration for Market Regulation in a timely manner. II. Regarding mobile cryogenic pressure vessels equipped with liquid discharge pumps To prevent accidents resulting from users filling onboard gas cylinders or other mobile pressure vessels illegally using mobile cryogenic pressure vessels equipped with liquid discharge pumps (hereinafter referred to as pump-equipped tank trucks), the use of such tank trucks must comply with the following regulations: (1) The entities that use pump-equipped tank trucks shall assume primary responsibility for ensuring the safety of their mobile pressure vessels, in accordance with the \"Rules for the Use and Management of Special Equipment\" (TSG 08-2017). It is necessary to continue to comply with the requirements set out in the \"Notice on Promoting the Use of a Public Service Information Tracking Platform for Mobile Pressure Vessels across the Country\", issued by the Special Equipment Bureau of the former General Administration of Quality Supervision, Inspection and Quarantine (Quality Supervision Special Letter [2017] No. 38). Units that operate pump-equipped tank trucks should be encouraged to use Internet of Things technology to monitor the operation trajectories of such vehicles, including the locations where liquid is unloaded. The user entity shall ensure the compliant use of its pump-equipped tank trucks, and promptly upload or share relevant information such as the liquid unloading points to the \"National Mobile Pressure Vessel Designated Unloading Information Service Platform\" (website: http://www.tpvms.org, hereinafter referred to as the Designated Unloading Platform), while also subjecting itself to the supervision and management by the safety inspection authorities in the location where the pump-equipped tank trucks and the pressure vessels at the unloading points are used. (II) For newly purchased pump-equipped tank trucks, the sales contract shall specify that the manufacturer is responsible for uploading information related to such products to the designated liquid unloading platform. For tank trucks in use that are equipped with pumps but do not have monitoring terminals for fixed-point liquid discharge (hereinafter referred to as monitoring terminals), the user units shall contact the original manufacturer before the expiration of the regular inspection period, requesting the manufacturer to install monitoring terminals on each such tank truck ； If safety hazards are identified, the original manufacturer shall eliminate such hazards through measures such as maintenance and modification, and then install monitoring terminals. (III) When conducting manufacturing supervision inspections on pump-equipped tank trucks, inspection agencies shall verify whether such trucks are equipped with monitoring terminals and connected to designated liquid unloading platforms ； During regular inspections, it is necessary to check whether pump-equipped tank trucks are connected to designated liquid discharge platforms and are in proper use, as well as to ensure that the monitoring terminals have not been damaged or removed. For pump-equipped tank trucks that lack monitoring terminals, are not operated at designated liquid unloading platforms, have their monitoring terminals damaged or removed, do not have designated unloading points, or have such issues not addressed in accordance with regulations, the inspection agency shall not issue a supervision inspection certificate or a regular inspection compliance report. (IV) Special equipment safety supervision agencies at all levels shall classify pump-equipped tank trucks as key equipment and strengthen supervision and inspection over them. When handling the registration for use of a pump-equipped tank vehicle, the registration authority shall verify whether such vehicle is already in operation at a designated liquid unloading platform; those that are not yet operating at such a platform shall not have their use registered. (5) The management of liquid carbon dioxide tank trucks equipped with pumps shall be carried out in accordance with the above provisions. III. Type testing on the low-temperature performance of vacuum insulated tanks (I) Requirements regarding the number of samples for type testing and certificates. 1. The number of samples taken for the type testing of fixed cryogenic pressure vessels in vacuum insulated tank format, as well as the relationship between the tank volume, shall meet the requirements of the product standards and the rules for type testing. 2. One vacuum-insulated tank of each type of mobile cryogenic pressure vessel shall be selected for testing. 3. The «Type Test Certificate» shall indicate the validity period. (II) Regarding the conversion of type test reports and certificates related to mobile cryogenic pressure vessels. After the issuance and implementation of the new standards NB/T 47058-2017 \"Road tank vehicles for frozen liquefied gases\" and NB/T 47059-2017 \"Tank containers for frozen liquefied gases\", the following requirements are set for the type testing of the low-temperature performance of mobile pressure vessel products manufactured in accordance with the previous standards: 1. Manufacturers shall, in accordance with the requirements of the new standards, conduct comparisons to determine whether their products meet the specifications regarding low-temperature insulation performance and other related technical indicators. For those that do not meet the requirements of the new standards, it is necessary to proactively contact a prototype testing institution to conduct the tests again. For those that meet the requirements of the new standards or pass re-testing, the type testing institution shall prepare the type testing report and the ‘Type Testing Certificate’ accordingly. 2. The conversion work for the type test report on the low-temperature insulation performance of mobile cryogenic pressure vessels and the \"Type Test Certificate\" shall be completed by October 1, 2019. IV. Regarding GB/T 5099-2017 \"Steel Seamless Gas Cylinders\" (I) Regarding the transition period for the implementation of the standard. 1. The implementation dates for GB/T 5099.1-2017 \"Steel seamless gas cylinders – Part 1: Cylinders with a tensile strength of less than 1100 MPa after quenching and tempering\" and GB/T 5099.3-2017 \"Steel seamless gas cylinders – Part 3: Cylinders treated by normalizing\" are January 1, 2019. Given the significant changes in this standard revision, and taking into account practical challenges faced by cylinder manufacturers in terms of raw material procurement and the installation and calibration of manufacturing equipment, a one-year transition period has been set for the implementation of the standard; during this period, both the old and new standards shall remain in force. During the transition period, manufacturing units may still use the previously approved original design documents for production. Before January 1, 2020, all manufacturing units shall complete the conversion of design documents and carry out type tests in accordance with the new standards. 2. As of January 1, 2020, all manufacturing units shall fully implement GB/T5099-2017 \"Steel Seamless Gas Cylinders\". (II) Regarding the determination of residual deformation rate through hydrostatic testing. 1. As of January 1, 2020, for cylinders manufactured in accordance with GB/T 5099.1-2017 \"Steel seamless gas cylinders – Part 1: Cylinders with a tensile strength of less than 1100 MPa after quenching and tempering\", a hydrostatic test using the external measurement method shall be conducted on each cylinder to determine the residual deformation rate, with real-time recording and traceability of the test data being ensured. 2. For cylinders manufactured in accordance with GB/T 5099.3-2017 \"Steel seamless gas cylinders – Part 3: Cylinders normalized\", a combined approach of internal and external testing methods can be used to determine the residual deformation rate during hydrostatic testing (that is, 5% of the cylinders in each batch are subjected to hydrostatic testing using the external testing method, while the remaining cylinders are tested individually using the internal testing method); the residual deformation rate values obtained from both methods must meet the standard requirements. (III) Regarding seamless cylinders filled with mixed gases. 1. For seamless cylinders filled with mixed gases, priority should be given to cylinders manufactured in accordance with GB/T 5099.1-2017 \"Steel seamless cylinders – Part 1: Cylinders made of steel with a tensile strength of less than 1100 MPa after quenching and tempering\". 2. If normalized cylinders manufactured in accordance with GB/T 5099.3-2017 \"Steel seamless gas cylinders – Part 3: Cylinders normalized\" are used, the content of impurities in the mixed gas must be strictly controlled. V. Other Matters (1) Relevant technical requirements for cryogenic pressure vessels. 1. To prevent accidents caused by overfilling of the tank, the design and manufacturing units shall propose measures to control the maximum filling volume of the tank and inform the user units thereof. The manufacturer shall equip fixed cryogenic pressure vessels with a volume limit device when their geometric volume is 10 m3 or less. 2. For mobile pressure vessels used to transport liquefied natural gas (LNG), when self-pressurized unloading is employed, the design pressure of the tank shall not exceed 1.0 MPa. 3. For cryogenic pressure vessels used to contain media with a boiling point not higher than -182°C, the manufacturer shall require the manufacturer of the insulation material to submit a test report confirming the compatibility of that insulation material with oxygen, issued by a **quality inspection center with the appropriate qualifications. 4. Cryogenic pressure vessels storing liquid oxygen media should be designed in such a way as to prevent the accumulation of C and H compounds, in order to avoid the risk of tank explosion. 5. When performing external pressure calculations for the inner vessel of cryogenic pressure vessels, the pressure used for these calculations is determined by the designer based on the maximum difference between internal and external pressures that may occur during manufacturing, transportation, loading/unloading, inspection, testing, or other operational conditions; there is no requirement to use a lower limit of 0.1 MPa or 0.04 MPa for this pressure value. (II) Selection of materials for mobile pressure vessels filled with stress-corrosion media. 1. For tanks filled with anhydrous ammonia at a water content of less than 0.2%, low-carbon steel and low-alloy high-strength steel shall not be used. When low-carbon steel and low-alloy high-strength steel are used for tanks filled with anhydrous ammonia at a water content slightly above 0.2%, materials with a specified yield strength of 370 MPa or less and a measured tensile strength of 630 MPa or less should be selected; these materials must be in an normalized state, and quenched and tempered steel shall not be used. 2. Except for anhydrous ammonia media, the material selection for tanks in other stress-corrosion environments shall meet the requirements of the \"Safety Technical Inspection Regulations for Mobile Pressure Vessels\" as well as the product standards upon which the design is based. Otherwise, design and manufacturing can only proceed after the new material technology is reviewed. (III) Design parameter proposals for mobile pressure vessels using ethylene oxide. For the design and manufacturing units of road tankers and tank containers that have passed the technical evaluation for ethylene oxide media, as of the date of issuance of this notice, their products must comply with the new design parameter specifications set out in the \"Special Technical Requirements for Ethylene Oxide Mobile Pressure Vessels\"; those that do not meet these requirements shall not be manufactured nor approved through supervision inspections. (IV) Regarding the factory sale of the medium filled during the trial production phase of the air separation unit. 1. Units applying for the trial filling of mobile pressure vessels for the construction of air separation production facilities must obtain the relevant permits for project planning, as well as approval documents regarding safety conditions and the design of safety facilities; they must also provide documentation proving that the enterprise is capable of carrying out trial production in compliance with laws and regulations. The sales scope of the medium filled by the filling unit (with the trial filling period being the same as the trial production period of the construction project) can be approved for sale after it is determined by the entity responsible for issuing filling permits based on expert reviews. 2. Upon the expiration of the trial filling period, and after a successful assessment, before issuing the filling license, the licensing authority shall also verify whether the filling unit has obtained the necessary business license (for projects that do not require a hazardous chemicals business license, an occupational safety license must be obtained). General Office of the State Administration for Market Regulation, January 29, 2019