Orifice flowmeter calculation software | Orifice flowmeter calculation

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1. Flow formula of orifice flowmeter

The core flow formulas of orifice flowmeter are volume flow formula and mass flow formula, which are classic fluid measurement formulas based on differential pressure method The basic differential pressure flow formula (universal derivation form) is derived based on Bernoulli equation and continuity equation, and is the universal basic formula for all differential pressure flow meters:$$ Q = C_d \times \varepsilon \times A_0 \times \sqrt{\frac{2\Delta P}{\rho}}$$ The meanings of each parameter are as follows: - $C_d $: flow coefficient, determined by the structure of the orifice plate, fluid flow state, and Reynolds number. The flow coefficient of a standard orifice plate can be obtained from industry standards. - $\ varepsilon $: expansion correction coefficient, used to compensate for the volume expansion effect of compressible fluids (gas, steam). For incompressible fluids, the value is 1- $A_0 $: cross-sectional area of the orifice plate opening, $A_0=\ frac {\ pi d ^ 2} {4} $, $d $is the diameter of the orifice plate opening - $\ Delta P $: static pressure difference before and after the orifice plate, taking the pressure difference between the upstream and downstream pressure taps of the orifice plate - $\ rho $Density of fluid in working state 2 Common formulas in segmented scenarios • Volume flow formula for incompressible fluids (liquids) At this time $\ varepsilon=1 $, the formula is simplified as: $$Q-v=C_d \ times \ frac {\ pi d ^ 2} {4} \ times \ sqrt {\ frac {2 \ Delta P} {\ rho} $The unit is usually $m ^ 3/h $or $L/min $• Volume flow formula for compressible fluids (gases/vapors) requires the introduction of an expansion correction coefficient. In practic

Calculation software for orifice flowmeter

al engineering, the simplified calculation form recommended by the ISA standard is often used:$$ Q_v = C_d \times \frac{\pi d^2}{4} \times \varepsilon \times \sqrt{\frac{2\Delta P}{\rho_1}}$$ Among them, $\ rho_1 $is the working density upstream of the fluid. The mass flow rate formula can be obtained by multiplying the volume flow rate by the fluid density$$ Q_m = \rho \times Q_v = C_d \times \varepsilon \times A_0 \times \sqrt{2\rho\Delta P}$$3. The industry standardized formula for standard orifice plates is based on GB/T 2624.1-2018 "Measurement of full pipe fluid flow using differential pressure devices installed in circular cross-section pipelines - Part 1: General principles and requirements". The flow coefficient of standard orifice plates can be directly obtained by looking up the Reynolds number in a table, and can also be calculated using an approximate formula in engineering:$$ C_d = 0.5961 + 0.0261\beta^4 - 0.216\beta^8 + 0.000521\left(\frac{10^4\beta}{Re_D}\right)^{0.7}$$ Where $\ beta=\ frac {d} {D} $, $D $is the inner diameter of the pipeline, and $Re-D $is the Reynolds number of the fluid inside the pipeline.

2. Foreign flow orifice plate software

The main software used for flow orifice plate calculation abroad are Maple Flow, FMWASS.exe, and E-cel flow restriction orifice plate calculation software.

. The following is a specific introduction: Maple FlowMaple Flow is a pipeline design software that provides a free-form computing environment. Its core functions cover valve size, flow rate, and pressure drop calculations, and it has a built-in database of thermal and physical properties. This software supports international pressure pipeline standards such as ASME B31 and can be dir

Orifice flowmeter calculation software | Orifice flowmeter calculation

1. Flow formula of orifice flowmeter

2. Foreign flow orifice plate software

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