Comparison of the main advantages and disadvantages of v-cone and vortex flowmeters

Abstract: The main advantages and disadvantages of v-cone and vortex flowmeters are compared with information provided by excellent flowmeter and flowmeter manufacturers. The main advantages of V-cone flowmeter 1. A very mature and well-known technology = rest assured, easy to use 2. No internal electronic components = flexible use (change range, maintenance on-site inspection); no interference from on-site electromagnetic signals 3. The user retains the right to the electronic part. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the main advantages and disadvantages of v-cone and vortex flowmeters. The main advantages of V-cone flowmeter 1. A very mature and well-known technology = rest assured, easy to use 2. No internal electronic components = flexible use (change range, maintenance on-site inspection); no interference from on-site electromagnetic signals 3. The user retains the right and opportunity to choose the electronic part. It can calibrate the electronic part (transmitter) separately, and it is also easy to realize integration. 4. No moving parts, high repeatability : liquid, gas, steam; high, medium and low temperature; high, medium and low pressure; high, medium and low flow rate; clean and dirty fluid; large, medium and small diameter) 6. High degree of standardization 7. Guaranteed accuracy : The error caused by the density change is small, only 1/2 of the velocity type flowmeter (electromagnetic, vortex, turbine, ultrasonic flowmeter); 8. Very flexible pressure loss; (very flexible in design) 9 , Strong replaceability and scalability; (differential pressure transmitter, secondary meter, primary components can be replaced arbitrarily, differential pressure transmitter can be connected in parallel to expand the range) 10. Easy to verify (as long as the fluid dynamics are kept similar Similar to the geometry, the outflow coefficient can be reproduced) 11. There are various types and materials of primary elements to choose from, especially the new generation of AVZ12, which can be added with heat preservation (heat tracing) device to achieve liquid viscosity reduction 13, It can be classified and graded according to the requirements of the use environment, and it is easy to meet the explosion-proof requirements. Disadvantages of v-cone flowmeter: Although V-cone flowmeter has many advantages, it still has some shortcomings. 1. Need to be calibrated The orifice plate is a flowmeter that can guarantee its measurement accuracy by ensuring the geometric size. The V-cone is a new type of flowmeter. Although many manufacturers and researchers have done a lot of experiments, the national standards that the V-cone flowmeter can be based on are limited so far. The available literature on the structural design of cone flowmeters is scarce. Each manufacturer produces according to the enterprise standard. It can be said that the products are mixed, and not every manufacturer's products are reliable. Due to insufficient test data, each V-cone flowmeter must be strictly calibrated before leaving the factory. This also increases its cost. 2. Higher selling price The price of V-cone flowmeter of the same specification is higher than that of orifice flowmeter, but lower than that of replaceable orifice flowmeter. Due to the large amount of materials used, the complex processing technology and the high calibration cost of the V-cone, its price is relatively high. However, when considering the flowmeter, the overall evaluation of the comprehensive factors such as the initial purchase price and installation cost, the reliability of the instrument, the long-term maintenance cost, and the maximum pressure loss is the basis for selecting the flowmeter. Make a reasonable selection. As mentioned earlier, in addition to the initial purchase cost of the V-cone flowmeter is higher than the orifice flowmeter, the other costs should be the same as or lower than the orifice flowmeter. Especially in terms of energy consumption required to compensate for pressure loss, V-cone flowmeters are far superior to orifice flowmeters. So in the long run, the overall cost of using a V-cone flowmeter is lower than that of an orifice flowmeter. The purpose of using a replaceable orifice plate is to increase the turndown ratio of the orifice plate. But it's expensive. If the V-cone flowmeter is equipped with two transmitters with different ranges, the expansion of the range ratio is much larger than that of the replaceable orifice flowmeter, and its price is much lower than that of the replaceable orifice. 3. Low differential pressure Because the outflow coefficient of the V-cone flowmeter is greater than that of the orifice flowmeter, the differential pressure value of the orifice plate is higher than that of the V-cone at the same flow rate. The transmitter of the orifice flowmeter generally uses a medium differential pressure gauge, and the V-cone flowmeter generally uses a low differential pressure gauge. Advantages and disadvantages of vortex flowmeter Advantages: 1. The structure is simple and firm, and the installation and maintenance are convenient; 2. There are many types of fluids suitable for use. Such as liquid, gas, steam and some miscible fluids; 3. High precision, wide range and small pressure loss. Limitations: 1. It is not suitable for low Reynolds number measurement, so the application is limited in the case of high viscosity, low flow rate and small diameter; 2. The stability of vortex separation is affected by the flow rate, and sufficient straight pipe sections are required; 3. The force-sensitive detection method is more sensitive to the mechanical vibration of the pipeline and should not be used in places with strong vibration; 4. The instrument still lacks theoretical research and practical experience in pulsating flow and mixed-phase flow;

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