Selection and installation of meter scale

Abstract: the selection and installation of meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. The flow of gas liquid two phase flow measurement of liquid and its vapor or components of different gas and liquid The flow phenomenon known as the gas liquid two phase flow. The former is called single-component gas liquid two phase flow, the latter is called the multicomponent gas liquid two phase flow into the gas liquid two phase flow in power, chemical, stone. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the selection of flow meter scale and the installation article details. The flow of gas liquid two phase flow measurement of liquid and its vapor or components of different gas and liquid The flow phenomenon known as the gas liquid two phase flow. The former is called single-component gas liquid two phase flow, the latter is called the multicomponent gas liquid two phase flow into the gas liquid two phase flow in industrial equipment such as power, chemical, petroleum and metallurgy are common, in the oil-gas in flow velocity difference between phase and the liquid phase, in measuring flow rate should be considered when the relative velocity. Manufacturers often claim that contains a few percent volume has a little influence on free gas liquid convection soar in value, but the impact value without specific data ^ however the information provided by related literature shows that the free gas in the liquid to flow, the influence of value for different design instrument difference is very big, the fluid pressure, flow velocity, viscosity, and the distribution of gas in a liquid state, such as the impact of different also therefore, zui to upstream flow meter with venting device. When a small amount of gas in the liquid, gas distribution is small bubble in the liquid available electromagnetic flowmeter measurement, just as measured by the bubble volume flow of the mixture. After the liquid contained in the gas quantity increase, the bubble of the geometry size increases gradually, and then to make the transition to slug structure. When the size of the bubble is equal to or greater than the meter electrode end face size and pass from electrode, electrode may be gas cover, make the circuit instantaneous disconnection, output the shaking. Under the high saturated vapor pressure of liquid flow measurement for liquid ammonia as an example, the discussion of ethylene, propylene and vinyl chloride easy to evaporate, such as high saturation vapor pressure of liquid flow measurement. Liquid ammonia flow with water flow measurement, oil flow measurement when there are two major differences: (1) when the liquid ammonia saturation vapor pressure is high, under the condition of normal atmospheric pressure, the boiling point is - 33. 41, therefore must under the condition of pressure transmission and storage; (2) in the fluid flow measurement easily because of the instrument at the exit of air-pocket pressure loss in the flowmeter and accompanying cavitation phenomenon, cause the meter high and flow value for a device is damaged. Encountered in the liquid such as ethylene, propylene flow measurement is the same. Here are the problems in the analysis of liquid ammonia flow measurement and the method of processing, and for other high saturated vapor pressure of the liquid flow measurement also has reference value. 1. The characteristics of the liquid ammonia flow measurement 1) Stored in a storage tank of liquid ammonia gas-liquid interface is generally in the gas-liquid equilibrium state. Figure 4 - 46 for ammonia plant library liquid ammonia flow measurement process: typical syngas from ammonia condenser, the mixture of gaseous ammonia and ammonia separation in the ammonia separator, liquid ammonia by the flow meter and liquid level control valve to low pressure ammonia tank in the middle. Ammonia separator and obviously, the picture of the gas-liquid interface and gas-liquid two phase are in balance. Flow measurement of liquid ammonia should avoid as far as possible in the two phase flow. Close to the gas-liquid equilibrium liquid ammonia, however, in through the flow of time, if the pressure loss is bigger, it's easy to cause partial gasification, affect the measurement accuracy of 2) The temperature of the fluid density coefficient is larger. From the liquid ammonia p = / i) Function table shows that in the normal temperature condition, the temperature of the liquid ammonia every change 1 ℃, its density change 0. More than 2%. Therefore, the liquid ammonia measuring temperature compensation must be conducted 3) High accuracy requirements. The former chemical related documents, liquid ammonia precision measurement should reach level 1. If you do not take effective measures, it is difficult to meet the requirements of the 04) Fluid inflammable and explosive. Instrument selection should be chosen when the explosion-proof type instrument, instrument installation, use and maintenance, shall comply with the rules of explosion-proof. 5) The corrosive medium being measured. Ammonia has strong corrosion of materials such as copper, therefore & rsquo; Instrument measured, and the part quality, and the direct contact should be able to tolerate ammonia corrosion, electronic circuit part of the instrument should be more than 1 p67 and protective ability, to prevent the surrounding environment of corrosive gas corrosion of electronics parts. 2. Gasification, cavitation and erosion and prevent fluid in the flow of fluid in pipe, if the pressure in the area to reduce below the liquid saturation vapour pressure & rsquo; The liquid in this area will have bubbles, the bubbles gathered near the low pressure area, will form the air-pocket, gas eight occur in a pipeline yan check with clubs,. Can bribe to air pockets in the lungs, it is for the tube for trade & ndash; A port area in a gas.

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