The deformation of the orifice flowmeter will have an effect on the flow measurement display. There is no standard and no experimental data, but the direction of the impact is easily visible. The deformation of the orifice plate varies greatly in degree. When the deformation is serious, it will be similar to the nozzle flowmeter. From the standard of the throttling device, it can be known that the coefficient of the standard orifice flowmeter is more, and the nozzle flows out. The coefficient is 0.99, which is used as the standard for analysis. After the orifice flowmeter is deformed, its actual outflow coefficient will increase correspondingly, and the flow indication will be correspondingly low . The orifice flowmeter uses its own function. For applications in various industries, the sonic nozzle method gas flow standard device for orifice flowmeters is the largest of the same types of flow devices in the country, with the highest degree of automation, and the most advanced standard measurement device, which can be applied to natural gas. The verification of different gas flow rates such as air, steam, etc. provides reliable data for the company's energy measurement and energy conservation and emission reduction. The pressure of the orifice flowmeter in the measuring tube without shrinkage or protrusion is due to the monitoring of the flow rate. In the previous design concept, the orifice flowmeter is affected by external factors, and the measurement tube is not shrinking or The protruding pressure loss, the initial signal detected by the flow element, is a voltage that changes with the average flow rate of the fluid to a precise linearity.
The orifice plate flowmeter is simple in structure, reliable in use, accurate in measurement, and convenient in inspection and maintenance. The throttling device is a throttling caused by an artificial medium flowing through a pipe, and when the measured medium is a flow throttling device, it causes a phenomenon of local contraction, in which the flow velocity concentrates, the flow velocity increases, or the static pressure decreases. It will cause a static pressure difference between the upstream and downstream sides of the orifice flowmeter. The static pressure difference is a function of the flow rate. The greater the flow rate, the greater the static pressure difference it generates. Therefore, the flow rate of the flow meter can be measured by measuring the differential pressure. There are many ways to measure the flow of the medium through the pipeline, but the most common and widely used orifice flowmeter throttling device (differential pressure flowmeter) is a differential pressure meter and throttling device or throttling. The device and differential pressure transmitter are connected together to form a secondary instrument. The orifice flowmeter has a long history and has been standardized both internationally and domestically. The throttling device is a primary element in the differential pressure measurement and is a differential pressure signal generated by the fluid used in the pipeline. The pressure guiding tube transmits the differential pressure signal generated before and after the throttling device to the differential pressure transmitter and then into the secondary instrument. It can show the instantaneous flow or cumulative flow rate of the liquid in the pipeline, and can use the adjustment instrument to The flow is adjusted.
Before installing the first orifice flowmeter inspection throttle position and size of the character does not meet the requirements which the pipeline is to be noted flowmeter mounting direction "+" sign is toward the flow. The flow meter must be installed strictly, and it is not allowed to have a flow leakage phenomenon. Therefore, it is necessary to test the pressure in the pipeline before installation. In the new pipeline system, it must be a pipeline sweep or Flush the flow meter installation. In order to avoid the differential pressure signal transmission of the flowmeter is useless, it is best to lay the ground pressure tube in the positive and negative pressure to lay the ground, in cold weather or to take antifreeze measures, but also can use electric or steam insulation The method, but also to prevent the measured medium from overheating and the gas generated in the pressure tube and cause false differential pressure signal. When the orifice flowmeter is installed on the vertical main pipeline, it can be selected at the position where the pressure is taken. The pressure guiding tube is made by selecting the pressure resistant and corrosion resistant materials according to the properties of the measured medium. The method of pressure extraction is to separate the flanges for pressure, round pressure, ring pressure, or square pressure. The orifice flowmeter can have non-standard circular orifices or shanked orifices. board. Flange pressure orifice flowmeter is regardless of the size of the pipe diameter, the center of the pressure hole taken upstream and downstream must be 1 on both sides of the orifice plate, in the refining system are used in this form.
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