The use of flowmeters must meet the back pressure requirements

The use of flow meters must meet the back pressure requirements. When measuring liquefied gases or hot solvents, and media with a tendency to release gas, in order to prevent cavitation, it is necessary to ensure that the sensor installed in the pipeline has sufficient back pressure. Back pressure refers to the pressure of the fluid at the downstream port of the sensor, and is usually measured at the pipe within 3: the length of the sensor from the downstream port of the sensor. The minimum back pressure index is '5^4 厶 In the formula, 厶- is the pressure loss of the flowmeter; it is the saturated vapor pressure of the medium at the highest working temperature; X and 5 are coefficients, depending on the structure of the flow sensor and the nature of the medium , which are generally found experimentally. The goal is to avoid any point in the piping system where the pressure is not lower than the saturated vapor of the liquid in the pipe5 to prevent the liquid from vaporizing. The measuring tube of the straight tube flowmeter has high rigidity and high resonant frequency. Due to the various reasons mentioned above, when the back pressure is insufficient, the vibration stability of the measuring tube will be affected to some extent. Experiments show that when the flow rate is zero, at least 0,02^? should be kept in the flow measuring tube. 3; gauge pressure). To do this, install the sensor in the lower part of the riser, and the height of the riser downstream of the sensor should not be lower than 2:! ! (depending on the medium density), as shown in Figure 3.50.

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