Vortex flowmeter orifice flowmeter

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What are the differences between vortex flowmeter and orifice flowmeter when measuring steam? Senior staff from Qingtian Instrument are here for you The main differences between vortex flowmeter and orifice flowmeter in measuring steam are reflected in seven aspects: accuracy, accuracy variation, universality, range ratio, pressure loss, maintenance cost, and service life. Specifically, accuracy: The orifice flowmeter strictly calculates the flow rate according to the national standard calculation formula. In demanding scenarios such as heating stations, it can provide more reliable measurement results and is suitable for steam measurement occasions with extremely high accuracy requirements. The vortex flowmeter uses a simplified formula to calculate flow rate, with slightly lower accuracy compared to orifice flowmeters, but it can still meet the requirements in general industrial scenarios. Accuracy variation accompanied by flushing and leakage: The orifice flowmeter has a smaller inner diameter, and the obtuse angle of the inner wall may change after long-term use, or the wall thickness may increase due to the accumulation of dust and pollutants, directly affecting the accuracy of the calculation formula and leading to a decrease in accuracy. The accuracy and linearity of the vortex flowmeter may drift after long-term use, but its performance can be restored through recalibration, making maintenance more flexible. Universality: Orifice flow meters require parameters such as pipe diameter, wall thickness, material, Reynolds coefficient, etc., which have high professional requirements and are usually only applied in specific scenarios such as heating stations. The calculation of vortex flowmeter is simplified, with low professional requirements and a wider range of applications, which can meet the needs of most industrial scenarios. Range ratio: The range ratio of orifice flowmeter is 1:3, and the measurement range is relatively narrow. The maximum measuring range ratio of vortex flow can reach 1:15, covering a wider flow range and adapting to scenarios with large flow fluctuations. Pressure loss: As a throttling device, orifice flow meters have significant pressure loss, which may increase system energy consumption. The pressure loss of the vortex flowmeter is relatively small, which has a lower impact on the operation of the system. Maintenance cost: The orifice flowmeter consists of multiple accessories and requires strict welding processes, with multiple sealing welding points that are prone to blockage. Maintenance is cumbersome and costly. The vortex flowmeter only requires flange welding, with no other welding points, low risk of blockage, and significantly lower maintenance costs than orifice flowmeters. Service life: The lifespan of the two is similar, but the vortex flowmeter is relatively more durable due to its simple structure and less maintenance requirements.

2. What flow meters are commonly used on steam pipelines?

The commonly used flow meters on steam pipelines mainly include the following types, which need to be selected based on actual working conditions, measurement accuracy, range, pressure loss, and installation and maintenance costs.

1. Working principle of vortex flowmeter: Based on the Karman vortex street principle, the steam flow rate is calculated by measuring the alternating vortex frequency generated by the impact of steam fluid on the triangular cylinder vortex generator.

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