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Orifice flowmeter selection Introduction quotation Imported flowmeter products

Orifice flowmeter selection
1, orifice flowmeter advantages
(1) Standard saving parts are universally used and approved by international standard arrangements. They can be used without actual flow calibration, and are also the only ones in flow meters.
(2) The structure is easy to imitate, simple, strong, stable and reliable, and low in price;
(3) The use plan is wide, including all single-phase fluids (liquid, gas, steam) and partial mixed-phase flow. Generally, the pipe diameter and working condition (temperature and pressure) of the production process have products.
(4) The appearance of the test piece and the differential pressure can be separated from the production of different manufacturers, and the production is planned with specialization;
2, disadvantages
(1) The repeatability and accuracy of the measurement are attributed to the medium level in the flowmeter, because the influence of many factors is confusing and the accuracy is difficult to progress.
(2) The planning degree is narrow, because the flow coefficient is related to the Reynolds number, and the general planning degree is only 3:1 to 4:1.
(3) There is a long straight pipe length requirement, which is generally difficult to satisfy. Especially for larger pipe diameters, the problem is more prominent;
(4) The pressure is lost;
Generally, in order to keep a perforated flowmeter operating normally, the pump requires additional power to overcome the pressure loss of the orifice plate. This additional power consumption can be directly determined by pressure loss and flow calculations. It takes about tens of thousands of kWh of electricity a year, equivalent to tens of thousands of yuan. The energy consumption accounting results for the orifice plate under normal pressure loss are listed in the table below. The operating days are calculated according to three hundred and fifty days, and the electricity price is calculated at 0.35 yuan/kWh. It can be seen from the calculation of the power consumption data in the table that the additional operation cost of the orifice plate is extremely high, and the operation cost of the electromagnetic flowmeter is zero!
(5) The orifice plate ensures the precision with the acute angle of the inner hole, so it is sensitive to corrosion, abrasion, scaling and dirt. It is difficult to ensure the long-term use accuracy. It is necessary to remove the strong inspection once a year.
(6) The use of flanges is easy to run, run, drip, and leak, which greatly increases the amount of protection.

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