Vortex and the differences of orifice meter scale

Abstract: the differences of vortex and orifice meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. One, the vortex street flowmeter and the orifice meter comprehensive performance evaluation of orifice meter ( Orifice plate) Through the throttling parts of pressure device and differential pressure transmitter, pressure guide tube for easy cold place requires heating measures, a flow measurement circuit of the static sealing points to 2. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a vortex and the differences of orifice meter scale article details. One, the vortex street flowmeter and the orifice meter comprehensive performance evaluation of orifice meter ( Orifice plate) Through throttling a pressure device and differential pressure transmitter, pressure guide tube for easy cold place requires heating measures, a flow measurement circuit of the static sealing point is about 20, the use of the following problems: easy to cold, easy to block, easy to leak, heating cause differential pressure transmitter components ageing, some occasions add spacer guide pressure tube and unstable due to heating or process operation, positive and negative guide spacer fluid pressure pipe line, often produce liquid column is poor, the flow indicator is not allowed. Above change will make the flow coefficient, measurement accuracy is reduced, pipe shortened lead pressure differential pressure transmitter directly installed on the pipeline, but there are still a flow dead zone. Vortex street flowmeter ( Vortex street) Only three static sealing point, not easy to leak, no dead zone, without thermal insulation, are not affected by severe fluid, temperature, pressure, and viscosity, flow coefficient unchanged for a long time. But there are vortex in vibration occasions, when using can make the flow measurement is not allowed. At present, the market has launched anti vibration type vortex street, to overcome the effects of vibration is not allowed for flow measurement. （ 1) Initial investment in a imported vortex street is about 20000 yuan ( DN15 - DN50) And a throttling device including differential pressure transmitter, orifice plate and flange, pressure pipe, valves, heat preservation box or protection box also need to 1. 50000 yuan, from a long-term point of view, using vortex street is still worthwhile. ( 2) Installation cost vortex street is simple, just before and after the meter has certain straight pipe, line segment, concentricity, orifice tube, and transmitter incubator has certain vortex street is the cost of installation requirements, several times. （ 3) Maintenance vortex street except on the metering requires periodic calibration, generally do not fail, while the orifice otherwise, leakage, regular drainage, irrigation, spacer, replace the pressure pipe, valves, heat preservation, clean the orifice plate, etc. , have a certain amount of maintenance. Such as 200 sets of flow orifice measurement circuit ( Need to heat preservation heat tracing) , every two years, the heat preservation heat tracing system reform will have to put some repairs, this does not include the differential pressure transmitter updates, orifice renewal fees. It enough to buy a certain quantity of imported vortex street. （ 4) 1 running cost. Steam consumption costs such as 200 sets of flow orifice measurement circuit ( Need to heat preservation heat tracing) , each with hot steam consumption is 0. 02 t/h, if calculated by an average of 4300 hours a year, steam cost is 40 yuan/ton, it needs steam consumption cost is about 68 a year. 80000 yuan, each loop annual cost is zero. 3. 44 million yuan. 2. Energy costs of vortex street pressure loss is smaller than orifice, about 1/15 of the orifice plate. Therefore, long-term operation of pump and fan can cost less. Orifice plate is 15 times of vortex street, when used for gas or steam flow measurement, due to the density is small, the same pipe diameter volume flow is big, the pressure loss is more serious, energy consumption cost is higher. 3. Leakage discharge sewage charge depending on the number that is about 20 times a year or so commonly, discharge of sewage and material atmospheric environmental pollution, sewage, the environmental protection department also want to its fine. （ 5) The design of the long running accuracy of orifice system accuracy of 1. 5% - 2. 5%, due to the differential pressure and flow rate is a linear relationship, the Philippines when the flow rate is less than 30%, the error increases, gas is too serious, on the other hand, due to the use of medium long-term wear, acute dull, make the flow coefficient is changed, is also an important factor affecting the accuracy. Due to the special structure of the vortex street, after the accuracy determined by way of actual ( Is about 0. 5% - 1% measured value) , the accuracy is almost the same. （ 6) Interchangeability a single vortex street can measure the rate of flow of gas, liquid and steam, electronic circuit board and sensitive element for different caliber of flowmeter has is generic and signal output usually has three forms: pulse, analog and digital signals. Can be switch on/off switch on the circuit board, the user may at any time according to their own need to switch to another output signal. Change the range is also very easy, for analog output, only need to change the input pulse frequency. Orifice plate, otherwise, the aperture is designed for a particular medium, poor compatibility, change range is more difficult, need to recalculate the orifice plate. （ 7) Range than the output frequency of vortex street and a linear relationship with flow, the flow of the range of part - 80:1, for example: Foxboro company of vortex street flowmeter measurement of gases and vapors range ratio of 80:1, the measuring range of liquid than 40:1, able to meet the requirements of process flow measurement range is bigger, still can guarantee the accuracy. Differential pressure and differential pressure flowmeter flow into nonlinear relationship, in small flow rate measurement is allowed to, range than only 3-1-5-1. If extended range than, must try to improve the accuracy of differential pressure transmitter.

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