Questions about LNG filling machines
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Why does the liquid feeding machine often experience sudden stops, a lower pressure limit, or an upper flow rate limit?
Based on your description, the poster should first check the following points: 1. The temperature of the pump pool is higher than -90 degrees； 2. The pressure difference in the pump tank is below 0.2 MPa (cavitation phenomenon) ； 3. Internal leakage of the gas valve ； 4. Mass flow meter issues. The original poster’s description of the issues isn’t very clear; for example, changes in current and frequency of the inverter after startup, whether the noise generated by the submersible pump is normal, whether the problem persists even after replacing the motherboard, and the flow rate protection settings of the LNG filling machine.
Focus on natural gas rather than LNG; learn about it. The client would like to have details regarding the operational flow rates, operating pressures, and the operating environment.
Thank you very much; it’s probably a motherboard issue.