T/JMTX 014-2020 The safety valve technical requirements for tank vehicles transporting hazardous goods in liquid form on roads

Scope

Scope: This standard specifies the basic requirements, specific requirements, test methods, and testing requirements for safety valves of tank vehicles used for transporting liquid dangerous goods by road. This standard applies to safety valves that meet the requirements of GB/T 12241 and GB 18564.1; Main technical content: 4. Safety valve technical requirements 4.1 Basic requirements The safety valves installed on the tank body shall comply with the provisions of the corresponding national or industry standards, and their materials shall be compatible with the filling medium. They shall also have product quality certification documents. The safety valves shall be installed at the top of the tank body and be designed to prevent the entry of any foreign objects. Unless otherwise specified in the design drawings, bursting disc devices shall not be used independently. The safety valves shall be able to withstand the pressure inside the tank, possible dangerous overpressure, and dynamic loads including the kinetic energy of the liquid flow. The discharge capacity of the safety valves shall comply with the following provisions: a) The discharge capacity of the safety valves shall ensure that they can be quickly discharged in the event of fire and abnormal pressure in the tank; b) When the tank is completely in a fire environment, the discharge capacity of the safety valves shall be sufficient to limit the pressure inside the tank (including accumulated pressure) to less than or equal to the hydraulic test pressure of the tank; c) The discharge capacity of multiple safety valves shall be the sum of the discharge capacities of each safety valve. The design and calculation of the discharge capacity of the safety valves may refer to Appendix C of GB 18564.1-2019. The safety valves shall have clear and permanent markings, which shall include the following contents: a) The set actuation pressure; b) The set safety valve setting pressure, discharge pressure, and allowable devia

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