Installation requirements for V-cone flowmeter

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1. The specifications for setting up flow meters in the torch system must comply with core specifications such as GB/T 3840-2021 "Emission Standards for Pollutants in the Petrochemical Industry" and SH 3009-2013 "Design Specification for Fuel Gas Systems and Combustible Gas Emission Systems in Petrochemical Enterprises" to ensure safe emissions, environmental compliance, and stable operation. 1. Core specification requirements 1.1 Flow meter selection • Type selection: Differential pressure flow meters (orifice plate, V-cone) are preferred for torch gas flow rate nuclear land stupid measurement, suitable for large pipe diameters, wide range ratios, and complex component gases; Thermal mass flow meters can also be used for accurate measurement of low pressure and small flow rates. Material requirements: Stainless steel (such as 316SS) or Hastelloy should be used for the parts in contact with the medium, which are corrosion-resistant and high-temperature resistant (torch gas often contains corrosive components such as H ₂ S). Range ratio: It should cover normal discharge, emergency discharge and other working conditions. It is recommended that the range ratio be no less than 10:1. 1.2 Installation Location - It should be installed in the vertical or horizontal straight section of the torch main pipe to avoid the influence of flow disturbance components such as elbows and valves. Requirements for straight pipe section: The length of the upstream straight pipe section should be ≥ 10D (D is the diameter of the pipeline), and the length of the downstream straight pipe section should be ≥ 5D to ensure measurement accuracy. Orientation requirement: When installing a horizontal pipeline, the flow meter should be located on the side of the pipeline to avoid the deposition of impurities. 1.3 Safety and Protection • Explosion proof Certification: Flow meters must have ATEX or IECEx explosion-proof certification, with an explosion-proof level not lower than Ex d IIB T4 (Zone 1) or Ex e II T3 (Zone 2). Fire protection design: The torch system is located in a fire hazard zone, and the flow meter should meet fire protection requirements (such as with fire-resistant coating). • Redundant configuration: It is recommended to configure flow meters redundantly for critical flare lines to improve reliability.

2. Key parameter settings 2.1 Flow range - Calculate the minimum, normal, and maximum flow rates based on the flare gas source (such as process emissions, safety valve releases). The maximum flow rate is designed according to the emergency discharge capacity of the device, and the minimum flow rate is set according to continuous micro discharge (to avoid the low end blind spot of the flow meter)

2.2 Pressure and temperature compensation - the flare gas pressure and temperature fluctuate greatly, and the flow meter needs to integrate pressure/temperature sensors or external compensation instruments, and be corrected to the standard operating flow rate in real time. • The accuracy of the pressure transmitter shall not be less than 0.075%, and the accuracy of the temperature sensor shall not be less than ± 0.5 ℃

2.3 Signal output and interlocking • Output signal: 4-20mA analog signal or MODBUS/PROFIBUS bus signal, uploaded to the DCS/SCADA system. High and low alarms: Set high flow alarms (warning of abnormal emissions) and low alarms (monitoring system leaks). Interlocking control: The auxiliary fuel or steam injection system can be

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