The selection and installation of Verabar flowmeters

1. The mechanical dimensions of the Verabar flowmeter are tailored to the dimensions of the installation pipeline. The measurement range is calculated and calibrated based on the flow data provided by the process. When selecting a model, it is important to provide the manufacturer with the correct flow data and pipe size. The pipe size includes the outside diameter and the wall thickness. The flow meter must be installed according to the standard in order to ensure that the measurement error of the entire measurement system is within the allowable range.

2. The front of the sensor bar must ensure that there are 7D~9D straight pipe lengths (the data provided by the manufacturers are different from 3D to 30D) to make the liquid and gas bodies in the large pipes. The flow rate is symmetrically distributed on the axis. Only in this way, the flow rates measured through several points can be used to estimate the flow through the entire cross-section. Otherwise, the flow velocity distribution of liquid and gas bodies in large pipelines will be very complicated, and the fluctuation of the flow coefficient K will be large, and measurement cannot be guaranteed. Accuracy. However, it is impossible to guarantee long straight pipes in actual process design. The author believes that if it is determined to use some kind of power flow meter, we can discuss with the supplier to ensure the repeatability of the system and try to shorten the straight pipeline. The relevant data record is as long as the ratio of the diameter of the test tube to the diameter of the process tube is less than 1 /10, the length of the straight pipe in the front pipe can be reduced to 3D to 4D.

3, the total pressure hole of the sensor rod must be in the direction of flow, the deviation is less than 7 °. The detection rod shall be inserted along the diameter of the pipe to the bottom. For the vertical pipe detection rod, it may be installed at any position along the pipe circumference 360° along the pipe circumference. The high and low pressure tubes should be on the same plane; for the horizontal tubes, the measurement should be installed with a downward slope. Whether the flow meter can accurately measure the length of its service life is directly related to whether it is installed correctly. Once the flow meter is installed, the system error that affects the accuracy of the flow meter will always be accompanied, and it is difficult to eliminate it from the software. The correct installation method may refer to the differential pressure flow meter installation specification, which will not be described here.

4. The detection rod is fixed on the pipeline through the joint. After tightening the joint, the detection rod must not be loosened or leaked. Pipe vibration and fluid shock will loosen the detection rod fixing head, causing the detection rod to break and damage, affecting accurate measurement and causing economic loss.

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