4.1.1 In-situ measurement generally uses a universal bimetal thermometer with a sealed thermowell;
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Instrument design and selection in the petrochemical industry
4.1 temperature measuring instrument
4.1.1 In-situ measurement generally uses a universal bimetal thermometer with a sealed thermowell;
4.1.2 It is necessary to use a thermocouple in the distance of the signal; Pt100 thermal resistance is used in the case of low temperature and high precision.
4.1.3 Furnace furnace temperature measurement The hot-sleeve thermocouple is used, and the surface thermocouple is selected for surface temperature measurement.
4.1.4 All temperature sensing components shall be flanged with large diameter process piping and equipment, and the connection to small diameter process piping shall be threaded. The temperature measuring component is provided with a protective tube that can be independently disassembled, and the corresponding materials are selected according to different media.
4.2 Pressure measuring instrument
4.2.1 Local indication, stainless steel pressure gauge Y-150 is generally used.
4.2.2 For the measurement of medium with vibration in the case of pulsation or power equipment exit, use stainless steel seismic pressure gauge;
4.2.3 For the measurement of corrosive, viscous, crystallization medium, use diaphragm pressure or diaphragm type seismic pressure gauge;
4.2.4 The pressure signal that needs to be transmitted remotely uses the intelligent pressure transmitter;
4.3. Flow measuring instrument
4.3.1 Requirements for measurement accuracy: The inside of the device is 1 to 1.5, the inlet and outlet devices are 0.5 to 1.0, and the factory is 0.2 to 0.3. Where accurate measurement is required, temperature or pressure compensation measures should be used, or mass flow meters should be used for measurement;
4.3.2 The important material measurement of the inlet and outlet device is selected from turbine flowmeter and vortex flowmeter;
4.3.3 The important fluid measurement into the factory is selected from mass flow meter or volumetric flow meter. The solid raw material is metered into the factory using railroad or railroad scale. The solid product is manufactured by quantitative METTLER TOLEDO quantitative packaging system. Gaochuang BDQC-E distributed quantitative canning system.
4.3.4 General flowmeters use orifice flowmeters with differential pressure transmitters;
4.3.5 Large-scale pipeline water flow measurement using plug-in electromagnetic flowmeter or ultrasonic flowmeter;
4.3.6 Large-scale pipeline cleaning gas flow measurement uses Annubar flowmeter with multi-parameter intelligent differential pressure transmitter to automatically compensate temperature and pressure;
4.3.7 Small pipe and clean medium flow measurement using metal tube float flowmeter;
4.3.8 Flow measurement of high viscosity medium using wedge flowmeter or helium flowmeter;
4.3.9 Steam metering can be used with orifice plate and thermal conductivity mass flowmeter. For applications below 400 °C, vortex flowmeter is used.
4.4 level measuring instrument
4.4.1 In-situ measurement selects the two-color quartz tube liquid level gauge without blind zone; the magnetic flap liquid level gauge with the measurement range greater than 2000mm; the high-pressure magnetic flap liquid level gauge is used in the high pressure occasion, and the liquid level measurement of the underground sewage tank is selected. Overhead level gauge;
4.4.2 When the small-scale liquid level signal in the device area is transmitted remotely, the external float liquid level transmitter is used, and when the measuring range is large, the double-flange differential pressure transmitter is selected;
4.4.3 viscous medium fractionation tower liquid level measurement using double flange liquid level transmitter;
4.4.4 Tank level measurement generally uses fiber level gauge or servo and radar level gauge; tank level measurement uses single flange level transmitter;
4.5 Actuator
4.5.1 regulating valve generally uses pneumatic diaphragm regulating valve;
4.5.2 Safety Interlocking Shut-off valve is a tightly-closed two-position single- and double-cylinder ball valve or gate valve. The shut-off valve and self-protection valve must be equipped with an inlet valve position return switch and ASCO low-power explosion-proof valve. The solenoid valve is 24VDC, direct-acting;
4.5.3 regulating valve configuration intelligent valve positioner, air filter pressure reducer;
4.5.4 special regulating valves are worn by handwheel devices;
4.5.5 The operating conditions are poor, and the brand regulating valve is used;
4.6 Analytical instrument
According to the process and environmental protection needs to set up the necessary online analyzer to control product quality; online oil, water quality analyzer: chromatography, hydrogen concentration, oxygen concentration, dissolved oxygen, COD and other equipment;
4.7 transmitter
The transmitters of pressure, flow, liquid level, material level and density are smart transmitters, and the standard signal is 4~20mA+HART protocol;
4.8 safety barrier
The safety barrier of this project uses isolated safety barriers with anti-surge function;
4.9 Ambient gas detection instrument
4.9.1 The combustible gas detection probe adopts catalytic combustion type;
4.9.2 Toxic gas detection probes generally use electrochemical methods such as electrolysis, with on-site alarm function;
4.9.3 flammable / toxic gas detection using transmitter type, power supply 24VDC output 4 ~ 20mA;
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