Water supply metering error and correction

Abstract: water supply metering error and correction of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Key words: water metering, flowmeter, error, and correction in the industrial production and life, in order to ensure the safety of water supply load distribution is reasonable, at the same time provide fundamental basis for economic accounting, mostly on the pipes installed detection with flow meter. , in the design process. More flow meter manufacturers choose model price quote you are welcome to inquire, here is water metering error and correction of the article details. Key words: water metering, flowmeter, error, and correction in the industrial production and life, in order to ensure the safety of water supply load distribution is reasonable, at the same time provide fundamental basis for economic accounting, mostly on the pipes installed detection with flow meter. Design process, often on the basis of the pipe nominal diameter and average flow matching measurement meter, under the condition of normal water supply, can meet the measuring accuracy requirement, but the actual operation process, there are all kinds of running state, often in the case of installation specification completely, appear very big measurement error, cause bigger loss measurement, water supply unit and measurement meter by the calibration accuracy is within the normal range. Below the author in the water supply management are analyzed in several ways. 1 flow measurement error of the variable frequency constant pressure water supply system and the correction with the development of frequency conversion technology, water supply engineering application of variable frequency constant pressure water supply equipment of water supply enterprises more and more, constant pressure water supply to the production and life brought very to the power saving benefit, is a kind of inevitable development direction. However water consumption in some days and nights of markedly different water supply area, using variable frequency constant pressure water supply, but brought greatly influence to measurement. I have a water supply unit of area, 1999 for the variable frequency constant pressure water supply. Reconstruction is completed, the water supply unit in the settlement of sunshine now users on water consumption is 15000 m3 before modification, and ( Water unit using intermittent water supply before modification, and the user owns a constant pressure water tower and water tank balance) 。 Water supply units at first considered users also reduced the production decline in water, then a few months or so, however, much less water for 15000 m3 / month, earlier junior use less from the previous 10000 m3 / month, even if the user production increases, water consumption has no change. Unit to gradually realize the seriousness of water supply, has carried on the earnest observation and monitoring, finally found the problem and pass. The area of water USES is Dg200 water supply pipeline, measuring chosen is vortex flowmeter, normal water supply condition, tested meter error is very small, but in the daily 23 to 7 when the next day, when the area users and the production and living water consumption was observed, when a user USES less than 80 m3 / h, measurement error to - About 20%, water consumption is less than 50 m3 / h, vortex street flowmeter metering, hardly error zui big - 100%, this is the constant pressure water supply water users after school has suffered a sharp fall in the real reason. It turns out that water supply units with vortex flow meter range is too narrow, put intermittent water supply problems exposed in there before. After constant pressure water supply cannot meet the requirements of measurement under different flow, small flow measurement error is too large, which means critical flow meter value is big, the result is that a larger cumulative flow error. Find out reason, after the water supply unit of comparison and analysis, zui eventually chose no head loss, and the speed range is from 0. 01 - 12 m3 / h ultrasonic flowmeter instead of the original vortex flowmeter, fundamentally correct too much flow changes brought about by the measurement error. For more than two years running, measurement is normal, reduce the loss of 350000 m3 above, benefit is significant. 2 small water user error correction and I have many construction units with larger area of public buildings, school water consumption is small. In the design process, however, at the same time considering building fire water specification requirements, water supply pipes are mostly above Dg100, also USES the same diameter measuring meter. Actual under normal water supply, water supply Chi water supply ability than users deviation is large, mostly under the critical flow rate of measuring meter, and even individual place below the zui small flow meter, caused the large measurement error. In order to solve this problem, we use the following two kinds of methods to solve more. （ 1) Shunt water supply according to user's daily load size, according to the need to reconfigure the water line all the way, not only ensure the normal demand, solves the problems of big measurement error, and will not affect the fire control safety. This transformation is a big problem: greater investment, difficulty is big. Suitable for water layout simple construction, good zui is an architectural design reach the designated position early infrastructure is advisable. （ 2) Great reconstruction of small tables in using shunt is difficult in the case, we are sometimes also used to meter replacement for small table manner. Change table size needs through calculation, to ensure that the flow rate and pressure is affected after table, is not in violation of the fire protection requirements. In this way, but not fundamentally eliminate the measurement error, but also corrects the error in the very great degree. After the reconstruction of this it is important to note that before and after the meter with straight pipe section should comply with the installation specification, otherwise, will generate additional installation error.

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