Electromagnetic flow meter in the measurement response and reducing use of water

The choice of water meters, to ensure water supply, accurate measurement and construction cost accounting is very important. Through practical operation and observation contrast in recent years, we believe that the electromagnetic flowmeter is better than that of other measuring instrument. The author combined with the practical work of engineering design, construction, municipal water supply tubing where the diameter electromagnetic flowmeter meter group design choice of some special case to talk about something specific. We found in the design of water connection to users, according to user's water pipe diameter or table size, some with different water properties should be considered. Such as development zone, a new medical instrument factory, divided into production in the use of water, domestic water and fire water, including office, production largest water consumption for 7. 62 m3 / h, unforeseen water by 15% plan to 1. 14 m3 / h, and air conditioning supplementary water 5 m3 / h, the maximum total water consumption for 14. 76 m3 / h。 According to the production and living water consumption, a group DN80 meter should be installed, and tube flow velocity is zero at this time. 83m/s。 According to the fire department approval, the enterprise workshop of fire risk for class c, need to install indoor and outdoor fire hydrant. Design institute of design is to build a 200 m3 fire pool, water content meet the indoor fire water consumption. Outdoor fire water are provided by municipal pipe straight outdoor ring of water supply pipe network. Fire hydrant water usage: outdoor fire hydrant water 30 l/s; Indoor fire hydrant water 20 l/s. According to the requirements for fire rules and regulations, shall be installed a set of 6 meter group. Production, life and fire water if it is installed a water meter set 6 electromagnetic flowmeter, based on fire code in the production and living water when achieving the maximum water still have to ensure the principles of fire fighting water pipe network fire, the fire control water quantity and water pressure meet the requirements. Fire water only in the use of fire, when the fire control system don't start at ordinary times, tube is mainly production, living water supply enterprises, tube flow velocity is zero at this time. 22m/s< 0. 3 m/s, can't meet the requirements of electromagnetic flowmeter for velocity range, ie not water consumption of production enterprises implement accurate measurement, it is reluctant to water supply enterprises. This caused by water tube flow velocity mismatch and cases need to users to install two groups of measuring instrument is often encountered in the practical work. Our solution is: 1. When the municipal water supply tubing diameter pipes, pipe fittings and valves, share after the parameters selected according to the system, choose the sensor diameter smaller than connection pipe diameter size of electromagnetic flowmeter, pipe diameter, table size, large diameter and small table size, reducer added before and after installing a connection sensors. As a result, in some local improve the velocity of electromagnetic flowmeter meet the requirements of the instrument for velocity range, makes the water supply enterprise in the water can be under the premise of accurate measuring dual function, save companies a set of metering device of the cost of investment. Such as the water meter fabric become medical instrument factory installed above pipes and gate valves, check valves diameter 6, electromagnetic flowmeter metering device for the DN100, sensor part of the flow velocity is zero at this time. 47m/s> 0. 3m/s。 2. Reducer to meet the requirements of taper. Electromagnetic flowmeter of inlet and outlet of straight section length requirement, reducer, added before and after the sensor to be seen as part of a straight pipe, should be consistent with the product on the sensor before and after the section of divergent or convergent cone Angle is less than 15 °. So it must be reducer center cone Angle calculation, such as the entrance and exit the DN100 electromagnetic flowmeter, according to the atlas of feed water and drainage standard making 6 x 100 reducer, after the center cone Angle calculation for 11. 74°< 15°。 3. Reducer can't meet the requirement of taper, must be custom-made extended divergent or reducing pipe. Such as development zone based on a large foreign enterprises to select DN600 electromagnetic flow meter in the original design of the water, the enterprise to the center of water supply for the water meter set construction costs, and because of the requirement of the straight section of electromagnetic flowmeter make water meter room too narrow, we consider the choice small primary and secondary pipe diameter size of the electromagnetic flowmeter, water flow speed in the allowed range. According to the standard atlas reducer size calculation, DN600 x 400 reducer center cone Angle to 20. 42 °, DN600 x 500 reducer center cone Angle is 16. 3 °, were greater than 15 °, do not meet the requirements of product design. Must therefore be custom-made the mark divergent or reducing pipe, extended reducing the length of the part, reduce center cone Angle and taper requirements within. Anyhow, electromagnetic flow meter used for measurement of water supply, due to its sensors have velocity requirements, but the velocity and the characteristics of wide range, designers can according to user's water consumption and the scene actual situation, make some flexible changes, it saves water meter set of investment, and measuring instrument operation in good working condition.

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