Temperature measurement and pressure measurement position of orifice flowmeter

Reasonable selection of temperature and pressure measuring positions When performing fluid temperature and pressure compensation, the positions of temperature and pressure measuring ports should be reasonably selected, because when steam flows through the flow measuring surface at a certain flow rate, the pressure measuring ports are selected in different positions to obtain measurements The values ​​are not the same. The temperature measuring port also has a similar situation. Judging from the actual situation of the flowmeter application site, although the positions of the temperature measuring port and the pressure measuring port used for temperature and pressure compensation are various, most of them have the pressure measuring port at the front and the temperature measuring port at the rear. That is, the pressure measuring port is opened on the pipeline upstream of the flowmeter, and the temperature measuring port is opened on the downstream pipeline of the flowmeter. Temperature measurement and pressure measurement position of orifice flowmeter ① The relationship between mass flow rate and respective variables, except for the formula mentioned above. ^) can also be used. In the formula, 62^the fluid expandability coefficient on the plane of the pressure-taking port at the negative end of the saving part; 91~the fluid density on the plane of the pressure-taking port at the negative end of the saving part; pressure,?&. The fluid is assumed to be compressible, and at&, ^2 are not much different, the fluid conforms to the ideal gas law, at this time, the formula ^.^ can be obtained by substituting formula 22〉for formula gate.21〉. Therefore, formula gate.21] and formula [3, 1> are equivalent. Regarding fluid density, . ^/D 2624—2006 stipulates in Article 5.1 2 that it can be measured directly, and can also be calculated based on the absolute static pressure, absolute (thermodynamic) temperature, and fluid composition at the differential pressure sampling port to form a corresponding equation of state. It is further stipulated in Article 5.4.3 that it is allowed to connect the differential pressure measurement device and the static pressure measurement device at the same time, but it must be ensured that this two-layer connection will not cause any error in the differential pressure measurement. The key data in this standard, such as the outflow coefficient (^ and the expandability coefficient 6, are all obtained through processing a lot of test data, so when using these test results to describe the saving equipment and measure the flow rate of the saving equipment thus described , it is actually the 'reverse process' of the test method. As for the difference between the pressure measured on the pipe section with a certain distance before the saving equipment and the pressure measured by the standard method, it can be calculated according to Bernoulli Equations, continuity equations and thermodynamic process equations [4] are calculated, but there are still some difficulties in detailed calculations, but it is not difficult to measure them on the spot.

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