Advantages, disadvantages and characteristics of throttle orifice flowmeter
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Release Time：2021-12-27
Throttle orifice flowmeter is a differential pressure generating device for measuring flow. Together with various differential pressure gauges or differential pressure transmitters, it can measure various fluid flows in pipelines. The orifice flowmeter throttle device includes a ring chamber orifice nozzle and the like. The orifice flowmeter throttling device can be used together with the differential pressure transmitter to measure the flow of liquid, steam and gas. The orifice flowmeter is widely used in petroleum, chemical, metallurgy, electric power, light industry and other fields.
Advantages, disadvantages and characteristics of throttle orifice flowmeter
Throttle orifice flowmeter is a differential pressure generating device for measuring flow. Together with various differential pressure gauges or differential pressure transmitters, it can measure various fluid flows in pipelines. The orifice flowmeter throttle device includes a ring chamber orifice nozzle and the like. The orifice flowmeter throttling device can be used together with the differential pressure transmitter to measure the flow of liquid, steam and gas. The orifice flowmeter is widely used in petroleum, chemical, metallurgy, electric power, light industry and other fields.
Advantages, disadvantages and characteristics of orifice flowmeter
When the fluid filling the pipe passes through the throttle device in the pipe, the light beam forms a local contraction in the throttle of the throttle device, which increases the flow rate and the static pressure is low, so there will be a pressure drop before and after the throttle. In other words, the greater the pressure drop and the flow of the medium, the greater the pressure drop that occurs before and after the throttle, so it can be passed through the orifice flowmeter. The measurement method is based on the energy code and the flow continuity law.
Intelligent throttling device orifice flowmeter is a new generation of flowmeter that integrates flow, temperature and pressure detection functions and can automatically compensate temperature and pressure. The orifice flowmeter adopts advanced microcomputer technology and new technology of micro-power consumption, with strong functions, small structure, simple operation and convenient use.
1. advantages
1. Standard throttling is used, approved by the International Standards Organization, it can be operated without actual current correction, and it is also better in the flowmeter.
2. The structure is easy to copy, simple, sturdy, stable in performance and low in price.
There are a variety of scope of application, including all single-phase fluid, gas, steam, part of the mixed flow, the general production process of the pipe diameter, the working state temperature, pressure.
4. Inspection items and differential pressure display instruments can be produced in different factories, together with specialized scale production.
2. Disadvantages
The repeatability and accuracy of the measurement are at a medium level in the flowmeter. The influence of many factors is complicated, and it is difficult to improve the accuracy.
2. Narrow scope. Because the flow coefficient is related to the Reynolds number, the general range chart is only 3:14:1.
There are long straight line length requirements, usually difficult to meet. Especially for the larger pipe diameter, the problem is more prominent.
4. The pressure loss is very large.
5. The acute angle line in the orifice plate ensures accuracy, so it is very sensitive to corrosion, wear, dirt and dirt. It is difficult to guarantee the accuracy of long-term use, and it needs to be inspected once a year.
6. The use of flange connection is prone to running, colon, water droplets and leakage problems, greatly increasing the maintenance work.
What do you need to pay attention to when buying throttle orifices?
To purchase a throttle orifice, you must first grasp the small flow rate, pressure, pressure drop, installation location, and safe discharge of the main pump, and then make a specific analysis according to the purpose. The principle of orifice plate is that when the fluid flows in the pipeline, the pressure of the fluid decreases due to the local resistance of the orifice plate, and the energy loss is thermodynamically called the throttling phenomenon. This method is simpler than using a control valve, but should be selected appropriately. Otherwise, the liquid is easy to corrode, which will affect the safe operation of the pipeline. Before purchasing the throttle orifice plate, first determine the interception oil pressure truck P, orifice plate series, orifice plate pressure drop, and calculate the throttle orifice plate pressure drop. Redetermine the orifice diameter of the orifice plate and calculate the orifice diameter. This is important. The calculation must be correct to ensure that the selection type is reasonable.
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2026/02/28
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