How to calculate flow rate with orifice flowmeter | Calculation of orifice flowmeter

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1. Calculation formula for orifice flowmeter

The calculation formula for orifice flowmeter is as follows: The orifice flowmeter can be widely used in industries such as petroleum, chemical, natural gas, metallurgy, power, pharmaceuticals, etc., for continuous measurement of volume flow or mass flow of various liquids, gases, natural gas, and steam. Simply put, the differential pressure value needs to be square root output to correspond to the flow rate. In practical applications, the calculation is relatively complicated and rarely done by oneself. This is usually calculated using software. The measurement principle of differential pressure flowmeter is based on the principle of mutual conversion of mechanical energy of fluid. The fluid flowing in a horizontal pipeline has dynamic pressure energy and static pressure energy (potential energy is equal). Under certain conditions, these two forms of energy can be converted into each other, but the total energy remains unchanged. Taking the volumetric flow formula as an example: Qv=C εΑ/sqr (2 Δ P/(1- β ^ 4)/ρ 1), where: C outflow coefficient; ε coefficient of expansion Α cross-sectional area of throttling element, differential pressure output by M ^ 2 Δ P throttling device, Pa; β diameter ratio ρ 1 density of the measured fluid at I-I, kg/m3; Qv volumetric flow rate, m3/h According to the compensation requirements, temperature and pressure compensation need to be added. According to the calculation sheet, the calculation idea is to use the process parameters at 50 degrees as the benchmark to calculate the flow rate at any temperature and pressure. Actually, the important thing is the conversion of density. The calculation formula is as follows: Q=0.7 * d ^ 2 * ε *

How to calculate flow rate with an orifice flowmeter

@ sqr (Δ P/ρ) Nm3/h0C101.325kPa, which is the volumetric flow rate required to be displayed on the screen at 0 degrees standard atmospheric pressure. According to the density formula: Sui Nian Heng ρ=P * T50/(P50 * T) * ρ 50, where ρ, P, and T represent the values of limbs at any temperature and pressure. ρ 50, P50, and T50 represent the process reference points at 50 degrees Celsius and a gauge pressure of 0.04 MPa. Combining these two formulas, the program can be completed. Program analysis 1: Instantaneous temperature measurement: must be converted to absolute Celsius temperature; Namely+273.15 pressure quantity: must be converted to absolute pressure for calculation. The calculation of gauge pressure and atmospheric pressure compensation is based on the calculation formula, and the data is saved in the register of the PLC. Simultaneously monitor on the intouch screen. The cumulative amount is triggered by a rising edge scan within 2 seconds, which converts the compensated flow rate value (Nm3/h) by 1800 units into a flow rate value every 2 seconds for cumulative summation. The screen has a reset function.

2. What is the proportional relationship between orifice plate differential pressure and flow rate? Orifice flowmeter attitude recognition belongs to a type of differential pressure flowmeter, which, like other differential pressure flowmeters, requires a transmitter for data measurement. The classification and respective characteristics are shown in the table below. Orifice flow meters can be widely used in industries such as petroleum, chemical, natural gas, metallurgy, power, and pharmaceuticals for continuous measurement of volumetric or mass flow rates of various liquids, gases, natural gas, and steam.

How to calculate flow rate with orifice flowmeter | Calculation of orifice flowmeter

1. Calculation formula for orifice flowmeter

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