T/JMTX 019-2021 Procedure for testing the tightness limit of oil and gas recovery system for automobile tanker trucks during petroleum transportation

Scope

Scope: This standard specifies the terms and definitions, testing requirements, testing equipment requirements, testing procedures, and testing conclusions for the detection of the sealing limit of the oil and gas recovery system in oil transport tank trucks. This standard applies to the detection of the sealing limit of the oil and gas recovery system in oil transport tank trucks. Main technical content: 4. Testing requirements: - The tank truck should be cleaned and no residual oil should be left in the tank body. 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 body to 7kPa. - Low-pressure regulator: Used to control the pressure of the high-pressure gas source, with a resolution of ≤20kPa. - Pressure gauge: Measuring range (-6～6kPa); maximum allowable error ≤±2.5% FS; resolution ≤30Pa. - Oil and gas pipeline detection joints: Equipped with shut-off valves and drain valves for connecting pressurization and vacuum hoses, and also connected to the pressure gauge. - Vacuum pump: Able to vacuum the tank body to -2.5kPa. - Pressurization and vacuum hoses: With an inner diameter of (6～10)mm, capable of withstanding the maximum pressure of the low-pressure regulator. - Relief valves: Connected in series to the pipeline, automatically opening at pressures of 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 Sealing limit values are specified in Table 1. Table 1: Sealing limit values for single-compartment or multi-compartment tank trucks - Single-compartment or multi-compartment tank trucks with a single oil compartment volume V (L) - Oil and gas recovery system pressure fluctuation limit (kPa) - V≥9500:≤0.25 - 9500＞V≥5500:≤0.38 - 5500＞V≥3800:≤0.50 - V<3800:≤0

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