Quantitative flowmeter | What are the potential safety hazards of the mass flowmeter quantitative loading system when it leaves the factory

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1. Doppler flowmeter

2. What are the safety issues hidden in the quantitative loading equipment of the mass flowmeter when it leaves the factory?

The safety issues hidden in the quantitative loading equipment of the mass flowmeter mainly focus on five core dimensions: loss of control of measurement accuracy, insufficient electrical and explosion-proof compliance, mechanical structure failure, lack of interlock protection, and lack of traceability of factory documents.

1. Safety hazards related to measurement accuracy.

Improper factory calibration: The full range and full operating condition factory calibration was not completed in accordance with the requirements of "Fluid Measurement with Gas and Liquid Flowmeters" (GB/T 21391-2023). Some manufacturers only performed single point calibration for the rated flow point, resulting in measurement deviation exceeding the standard under low flow and high flow conditions. Overloading or underloading of flammable, explosive or toxic materials during loading can easily cause material spillage, environmental pollution, and even explosion risks. 2. System compatibility has not been verified: Joint debugging tests were not conducted for on-site material density, pipeline pressure, and loading flow rate, leading to a mismatch between quantitative control logic and actual operating conditions, resulting in excessive or insufficient quantitative loading, and may also cause pipeline pressure build-up and pump overload.

2. Electrical and Explosion Protection Compliance Vulnerability (1) Incorrect Matching of Explosion Protection Levels: The explosion-proof type and temperature group marked at the factory do not meet the hazard level requirements of the

loading area. For example, using explosion-proof equipment suitable for Class IIB gases in the loading area with Class IIC gases such as acetylene and hydrogen cannot block explosions caused by electric arcs.

. （2） Insufficient electrical safety redundancy: There is no dual redundancy design for the control circuit of the emergency shut-off valve, only single relay control is used, and emergency shut-off cannot be triggered in case of circuit failure; No special grounding resistance test was conducted, resulting in the failure of the electrostatic discharge circuit and the accumulation of electrostatic sparks during the loading process. （3） Irregular wiring process: The factory wiring terminals have not been treated with anti loosening measures, resulting in loosening and sparking after long-term vibration, causing electrical short circuits.

III. Risk of Mechanical Structure Failure (1) Failure to Conduct Fatigue Testing on Sealing and Connecting Components: The rotating joint and sealing gasket of the loading arm have not undergone fatigue testing for millions of opening and closing cycles, which can lead to material leakage after frequent loading. Leakage of toxic or flammable and explosive materials can cause poisoning and explosion hazards.

. （2） Omission of pressure and leakage testing: Failure to complete water pressure and air tightness tests in accordance with the requirements of the "Code for Construction of Industrial Metal Pipeline Engineering" (GB 50235-2010), resulting in hidden cracks or sand holes in some pipelines and crane pipes, and explosions and leaks during on-site use. （3） The reliability of the crane tube locking device is insufficient: no locking load test was conducted, and the cran

Quantitative flowmeter | What are the potential safety hazards of the mass flowmeter quantitative loading system when it leaves the factory

1. Doppler flowmeter

2. What are the safety issues hidden in the quantitative loading equipment of the mass flowmeter when it leaves the factory?

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