T/JMTX 019-2022 Procedure for testing the tightness limit of oil and gas recovery system for oil product transportation vehicles with tank car

Scope

Scope: This standard specifies the terminology and definitions, testing requirements, testing equipment requirements, testing procedures, and testing conclusions for the detection of the sealing limits of the oil and gas recovery system in oil transport tank trucks. This standard applies to the detection of the sealing limits of the oil and gas recovery system in oil transport tank trucks. Main technical content: 4. Testing requirements: The tank truck must be cleaned and there should be no residual oil in the tank. It should be parked in a location not directly exposed to sunlight for testing. 5. Testing equipment requirements: Nitrogen pressurization system. The nitrogen pressurization system can pressurize the tank to 7kPa. Low-pressure regulator. The low-pressure regulator is used to control the pressure of the high-pressure gas source, with a graduation value of ≤20kPa. Pressure gauge. The pressure gauge measures a range of (-6～6)kPa; the maximum allowable error is ≤±2.5% FS; and the graduation value is ≤30Pa. Oil and gas pipeline detection joints. The detection joints are equipped with shut-off valves and drain valves that can be connected to pressurization and vacuuming hoses. In addition, the detection joints should also be connected to the pressure gauge. Vacuum pump. The vacuum pump can vacuum the tank to -2.5kPa. Pressurization and vacuuming hoses. The inner diameter of the pressurization hose and vacuum hose (6～10)mm can withstand the maximum pressure of the low-pressure regulator. Pressure relief valve. The pressure relief valve is connected in series with the pipeline and automatically opens when the pressure reaches 7kPa and -2.5kPa. 6. Testing procedures: - Inspect and record the relevant components of the oil and gas recovery system. - Oil and gas recovery system sealing limit detection (positive pressurization): 6.2.1 The sealing limit is specified in Table 1. Table 1: Sealing limit of a single tank or multiple tanks in an oil tank truck. Volume V

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