Orifice flowmeter is a high-range differential pressure flow device which is composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter) to measure gas, The flow of steam, liquid and lead is widely used in process control and measurement in the fields of petroleum, chemical industry, metallurgy, electric power, heating, and water supply. The throttling device, also known as a differential pressure flowmeter, is widely used in gas by a test piece (throttle) and a secondary device (differential pressure transmitter and flow indicator). Steam and liquid flow measurements. Has a simple structure, easy maintenance, stable performance.
What are the methods for use of orifice flowmeters? How can orifice flowmeters be used correctly? What are the precautions for using orifice flowmeters? Orifice flowmeters are a combination of flow, temperature, and pressure detection functions and are capable of automating temperature and pressure. The compensated new-generation flowmeter adopts advanced microcomputer technology and new micro-power technology. It has strong functions, compact structure, simple operation and easy use.
The orifice flowmeter consists of sensing, transmission, and calculation. The three major parts are mainly applicable to the industrial measurement of saturated steam, superheated steam, compressed air, mixed non-flammable and explosive gases, and hot water. The flow of the above fluid is measured and displayed. , metering and online automation of the production process can be used. The most important thing to pay attention to when it is put into operation is that it must be filled with water or injected high-temperature steam before it can be started.
The straight pipe section before and after the orifice meter flow meter must be straight. The straight pipe section used for installing the throttle should be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness correction sparse. A lengthy straight pipe section is required before and after the throttle piece. When the upstream side of the throttle piece is an open space or a large container with a diameter larger than or equal to 2D, the straight pipe length between the open space or large container and the throttle piece shall not be less than 30D (15D). . If there is any other partial resistance between the throttle and the open space or large container, except from the open space to the joint, the length of the minimum straight pipe section between the throttle and the local resistance is specified. The total length of straight sections between flow elements must not be less than 30D (15D).
How to use the orifice flow meter correctly: Here's a detailed description for everyone: 1. The pressure tube system is filled with cold water as a pressure-conducting medium, and the high-temperature steam is usually guided by cold water. In the case of no steam in the pipeline, open the valve, pressure valve and balance valve, close the drain valve, and inject cold water directly from the condensate filling hole until it is fully filled. Of course, it is also possible to close the balance valve and the pressure valve, and open the valve once to introduce high-temperature steam and slowly cool it into water. This method is generally not adopted because the steam temperature is too high and it is easy to damage the instrument. Special attention should be paid to the fact that when the high temperature steam is measured, the pressure guiding pipe is not filled with water or the temperature is too high. Measure compressed air, cold water directly by the medium pressure. 2. Adjust the zero point migration of the pressure transmitter. Since the water column in the pressure pipe generates an additional pressure, the pressure indicator should have additional readings. Zero pressure is required to zero the additional pressure. Specific approach: Close the valve once, open the pressure valve, and turn on the power. Open the pressure transmitter housing and adjust the migration screw so that the pressure indicator output is zero. 3. The differential pressure transmitter exhausts or discharges the liquid. After the pressure guiding tube is filled with water, a small amount of gas may be accumulated in the pressure chamber of the differential pressure transmitter to affect the pilot pressure and must be eliminated. Unscrew the positive and negative pressure bolts at the bottom of the chamber. Normally, the newly commissioned instrument does not need to be drained. Check the pilot line system without any leakage, close all valves, and be ready for operation.

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