The possibility of using range extension orifice meter scale

Abstract: the possibility of using range extension orifice meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Since the advent of vortex flowmeter is widely used, mainly is the lack of experience with people, worried about its reliability and accuracy of measurement, so we make the following comparison. 1. 1 range than the vortex street flowmeter and the orifice meter ( In order to common PN4. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the possibility of using range extension orifice meter scale article details. Since the advent of vortex flowmeter is widely used, mainly is the lack of experience with people, worried about its reliability and accuracy of measurement, so we make the following comparison. 1. 1 range than the vortex street flowmeter and the orifice meter ( In order to common PN4. 0 mpa orifice meter as an example) Range is shown in table 1. According to Bernoulli equation, and differential pressure orifice flowmeter flow q delta p can be expressed as follows: the relation of orifice plate is proportional to the square of the pressure drop and flow rate, if the flow range ratio of 3:1, differential pressure range than will achieve 9:1, general differential pressure transmitter range than 8 ~ 10:1, this limits the range of orifice meter is higher than impossible. Usually orifice calculation, zui small flow rate less than 33% of calibration flow is unqualified, namely range than & ge; 3; And the range of vortex street flowmeter than most & gt; 10, can be in 10% ~ 100% F. S within the scope of any section of the work, also can work with the full range, greatly improving the flexibility of instrument selection. 1. 2 measuring accuracy comparison ( 1) Is assumed temperature at constant pressure of the flow, if changes in temperature and pressure, density and viscosity of the fluid will change, so that the measurement of flow occur error; At the same time, the accuracy of orifice flowmeter are affected by concentricity, pipe roughness, the influence of the length of straight pipe before and after. Orifice calculation, under the condition of the above factors are conform to the requirements of its imprecision & gt; 0. 6%; In fact because of the influence of the above factors, its accuracy is much larger. Such as the flow coefficient is 0. 5, if the upstream in one plane with two 90 & deg; Elbow, straight pipe upstream should be 20 d, if due to the limitation of conditions, according to the 10 d length when installation, additional error as & plusmn; 0. 5%, and the contraction of pipe and valve will generate additional error, so in fact not accuracy & gt; 2%. System error for the transmitter with orifice measurement error of overlay, such as using a 0. 25% accuracy of differential pressure transmission measurement, work assumes that the differential at 50%, its accuracy is 0. / 0 25%. 5 = 0. System error = 5%, orifice error + transducer error = 2% + 0. 5%, namely the measurement precision can reach 2. With orifice plate wear deformation reduced 5%, and accuracy. The vortex street flowmeter liquid measurement precision of 0. 75%, gas measurement accuracy is 1%, significantly better than that of the orifice flowmeter. Generally higher reliability and stability of the orifice flowmeter, and domestic vortex flowmeter has yet to reach a satisfactory level, but many from abroad buy instrument, its reliability and stability can compete with orifice flowmeter. 1. 3 investment is a) Equipment materials: a DN100 orifice meter, including throttling device, leads pressure transmitter, valves, piping materials and instrument cases about 1. 50000 yuan to use (or DN80 vortex flowmeter can measure the same flow rate, the import price is about 20000 yuan, one-time investment slightly higher than the orifice meter. b） Installation: orifice meter installation fee is about 20 times the vortex flowmeter. c) Maintenance: one-time installation after the completion of vortex flowmeter, in addition to the regular calibration, essentially maintenance-free. Often orifice meter will be expected to change materials, irrigation, drainage, heat preservation heat tracing system maintenance, the maintenance cost is accumulated considerable. d） Operation cost: the orifice meter used to measure may condensation of medium, the need to heat preservation heat tracing, the vortex street flowmeter is not required. Jinshan phenol chemical equipment, for example, most of the medium of crystallization in 40 ℃, in 190 of the orifice flowmeter has 150 need heat tracing for years to more than 50 ℃, each with hot year average steam 10 kg/h, working 6000 h a year, 60 yuan per ton steam, heating fees for 540000 yuan, each point of running costs an average of 3600 yuan/year. Ordinary heating loop steam about 6 kg/h, 3000 h to consider every year according to the tracing, 18 t steam consumption, costs 1080 yuan. Comparison by above knowable, imported vortex flowmeter, an investment is slightly higher than that of orifice meter, but from the maintenance and operation cost to consider for a long time, use is better than that of orifice flowmeter, vortex flowmeter and vortex flowmeter accuracy and range than were superior to the latter, the reliability and stability with the latter, thus to some extent, replacing orifice meter with vortex flowmeter is possible. 2 the feasibility of the extended scope of vortex street flowmeter using 2. 1 vortex street flowmeter performance comparison (with orifice flowmeter See table 2) Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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