Current position > Product detail
『Calculation formula for orifice plate flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Calculation of Orifice Flow Meter
The orifice plate is composed of a throttling plate with a central hole on the gas extraction pipeline, vertical sections on both sides of the orifice plate, and pressure tapping pipes. When gas flows through the orifice plate in the pipeline, the flow will form local contraction. In the case of constant total pressure, contraction will increase the flow volume and decrease the static pressure, resulting in a static pressure difference before and after the throttle plate. In the case of a curved pipeline with the same cross-section, the larger the gas flow rate, the greater the pressure difference, so the gas flow rate can be determined by measuring the pressure difference. The flow rate of the mixed gas is calculated using the following formula: Q=Kb △ h1/2 δ P δ T. The coefficient of the formula is calculated as follows: K=189.76a0mD2b=(1/(1-0.00446x)) 1/2 δ P=(PT/760) 1/2 δ T=(293/(273+t)) 1/2, where Q represents the mixed flow rate, m3/s；
2. The standard curve can be obtained, but the difference in differentiation between points may be due to reasons
3. Calculation formula for air supply volume flow rate: Orifice flowmeter
The core formula for calculating air supply volume flow rate using an orifice flowmeter is: $q_ {v}=C \ varepsilon A_{0} \ sqrt {\ frac {2 \ Delta p} {\ rho} $, with the calculation result unit being cubic meters per second ($m ^ {3}/s $).
. one Formula parameter analysis(1) $q_ {v} $(volume flow rate) represents the volume of fluid per unit time and is the final calculation result.
(2) $C $(outflow coefficient) is related to the orifice plate structure, Reynolds number, and pressure measurement method, and the
(3) When the fluid is a gas, it needs to be calculated or corrected according to the pressure ratio ($\ Delta p/p $), isentropic index, etc. (liquid $\ varepsilon=1 $).
.(4) $A_ {0} $(opening area) is calculated by the opening diameter $d $of the orifice plate, with the formula $A_ {0}={\ pi d ^ {2}}/{4} $, in square meters.
(5) $\ Delta p $(pressure difference) is directly measured through a differential pressure gauge, and it is necessary to ensure that the measuring point position meets the standard fuel preparation (such as corner joint pressure, flange pressure).
(6) $\ rho $(fluid density) The gas density needs to be corrected according to the actual working conditions (such as $\ rho={\ rho_ {0} p T_ {0}/{(p_ {0} T)} $), and the liquid can be regarded as a constant value. two Calculation steps
(1) Determine the orifice plate parameter measurement or query aperture $d $, calculate $A_{0} $, and confirm that the installation meets the standards (such as the length requirements of the straight pipe section).
(2) Measure the pressure difference $\ Delta p $using a calibrated differential pressure gauge to obtain data, avoiding interference from pipeline vibration or fluid fluctuations.
.(3) To obtain the density of $\ rho $gas, the real-time density needs to be calculated based on temperature and pressure. For liquids, refer to the physical properties manual for values.
(4) Determine the coefficients $C $and $\ varepsilon $by matching parameters according to standards (such as ISO 5167) or data sheets provided by orifice plate manufacturers.
(5) Substit