Flow meter experiment

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How to use a Venturi flowmeter?

The data obtained from the measurement of the U-shaped tube is more accurate, but the measurement range is small. However, the differential pressure transmitter has a larger error at low flow rates, and a smaller error at high flow rates.. First use an inverted U-tube differential pressure gauge, and when it exceeds the range, use a differential pressure transmitter. Note that the change in flow rate should ensure that the experimental points are evenly distributed on the λ - Re curve. Experimental objective

1. Find the relationship curve between the flow rate and pressure difference of the Venturi flowmeter.

2、 Measure the flow coefficient of the Venturi flowmeter. According to Bernoullis principle, the flow rate is related to the pressure difference before and after the Venturi flowmeter as follows: (4-14) in equation: - volume flow rate m3/s; - cross-sectional area of the throat neck of the Venturi tube, m2; Cv - flow coefficient of the Venturi flowmeter, dimensionless; R-reading of U-shaped differential pressure gauge, m; - indicated liquid density inside the differential pressure gauge, kg/m3. - fluid density. kg/m3。 However, the numerical value of the flow coefficient is often influenced by the structure and processing accuracy of the Venturi meter, as well as fluid properties, temperature, and pressure. Therefore, before using such quantity meters on site, it is often necessary to calibrate the flow meter by measuring the differential pressure readings at different flow rates, directly plotting them into curves, or obtaining the relationship curve between CV and Re (the flow coefficient CV varies with Re number when the ratio of throat diameter to pipe

2. What are the inspection standards for balance flow meters?

The inspection standards for balance flow meters shall comply with the national metrological verification regulations "JJG 640-2016 Differential Pressure Flow Meter Verification Regulations".

1. Technical Requirements 1 Structure and Materials: The flowmeter structure should be intact and undamaged, and the welds of pressure bearing components must be sealed. When measuring corrosive media, components that come into contact with the fluid must be made of corrosion-resistant materials such as 316L stainless steel. 2. Technical record: There must be a calculation sheet provided by the manufacturer to record core parameters such as flow sensor coefficient and outflow coefficient.

Secondly, the calibration environment requires that the calibration be carried out in the laboratory, with an ambient temperature of 20 ± 2 ℃ and a relative humidity between 45% and 75%.

III. Verification Operation Process 1 Flow point selection: Select at least 5 evenly distributed points within the range of the flowmeter for calibration. Standard device: Use a standard device with an accuracy level twice that of the flowmeter being tested, such as a volumetric tube or mass flowmeter. Data recording: Record the output current and transmitter diaphragm migration simultaneously, and verify the correspondence between flow rate and differential pressure. Leak detection and verification: For split type flowmeters, the throttling device must be combined with the differential pre

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