What is a bore flowmeter and do you know it?

The orifice flowmeter, also known as the differential pressure flowmeter, is composed of a primary detection piece (throttling piece) and a secondary device (differential pressure transmitter and flow indicator), which is widely used in the flow measurement of gas, steam and liquid. It has the characteristics of simple structure, convenient maintenance, stable performance and reliable use.

1. Overview The orifice flowmeter, also known as the differential pressure flowmeter, is composed of a primary detection piece (throttling piece) and a secondary device (differential pressure transmitter and flow indicator), which is widely used in the flow measurement of gas, steam and liquid. It has the characteristics of simple structure, convenient maintenance, stable performance and reliable use. The orifice throttling device is a standard 100 throttling parts, which can be produced directly in accordance with national standards without calibration, 1

National Standard GB2624-81 "Design, Installation and Use of Flow Measurement Throttling Devices; 2.The international standard ISO5167 "various throttling devices specified by the International Standards Organization; 3.Ministry of Chemical Industry Standard GJ516-87-HK06.

Second, the working principle of the fluid filled with the pipeline flows through the throttling device in the pipeline, causing local shrinkage near the throttling parts, increasing the flow velocity, and producing a static pressure difference between the upstream and downstream sides. Under the condition that the relevant parameters are known, the relationship between differential pressure and flow can be deduced according to the principle of flow continuity and Bernoulli's equation to obtain the flow rate.

That is to say, the orifice flowmeter is a flow meter that measures high temperature and high pressure media.

The fluid that fills the pipe flows through the throttling device inside the pipe, causing local shrinkage and an increase in the flow velocity near the throttle.

Orifice flowmeter is a high-range ratio differential pressure flow device composed of standard orifice plate and multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter), which can measure the flow rate of gas, steam, liquid and induced, and is widely used in process control and measurement in the fields of petroleum, chemical industry, metallurgy, electric power, heating and water supply.

The throttling device, also known as the differential pressure flowmeter, is composed of a primary detection piece (throttling piece) and a secondary device (differential pressure transmitter and flow indicator), which is widely used in gases.

Flow measurement of vapors and liquids. It has simple structure, convenient maintenance and stable performance.

How the orifice flowmeter works.

The fluid that fills the pipe flows through the throttling device in the pipeline, causing local shrinkage near the throttle, increasing the flow velocity, and creating a static pressure difference between the upper and lower reaches of the pipeline. Under the condition that the relevant parameters are known, the relationship between differential pressure and flow can be deduced according to the principle of flow continuity and Bernoulli's equation to obtain the flow rate. The basic formula is as follows:

c Outflow coefficient dimensionless d Diameter of the throttle hole or throat of the throttle under working conditions d Upstream pipeline inner diameter qm mass flow kg sqv volume flow m s diameter ratio d d under working conditions

The density of dimensionless fluids kg m Feiyun meter.

The measurement range of the orifice flowmeter can start from DN25 caliber and DN3000 for large diameter, and its range is also increased according to the pressure of the pipeline.

The orifice flowmeter is a differential pressure generator for measuring the flow rate, and can measure the flow of various fluids in the pipeline with various differential pressure gauges or differential pressure transmitters. The orifice flowmeter throttling device includes annular chamber orifice plate, nozzle, etc. Orifice flowmeter throttling device with.

Differential pressure transmitters.

It can measure the flow of liquid, steam and gas, and is widely used in petroleum, chemical, metallurgy, electric power, light industry and other departments.

The fluid filled with the pipeline, when they flow through the throttling device in the pipeline, the flow beam will form a local contraction at the throttle of the throttle device, so that the flow rate increases, and the static pressure is low, so the pressure drop is generated before and after the throttle, that is, the pressure difference, the larger the flow rate of the medium flow, the greater the pressure difference generated before and after the throttle, so the orifice flowmeter can measure the size of the fluid flow by measuring the pressure difference. This measurement method is based on the law of energy conservation and the law of flow continuity. Jinhu Huineng Instrument****.

[Introduction].

The gauge will be placed in a standard well plate.

with multi-parameter. Differential pressure transmitters (or differential pressure transmitters, temperature transmitters and pressure transmitters) are composed of a high range ratio differential pressure flow.

device, which can measure gases,

Steam, liquid and induced flow are widely used in petroleum

Chemical industry, metallurgy,

electricity, heating, water supply and other fields.

Process control. and measurements.

Throttling device. Also known as differential pressure flow meter.

It is composed of a primary detection piece (throttling part) and a secondary device (differential pressure transmitter and flow indicator), which is widely used in gases. Flow measurement of vapors and liquids. Have.

The structure is simple, the maintenance is convenient, and the performance is stable.

Measuring principle] under conditions under which the relevant parameters are known, according to the flow.

Principle of continuity.

and Bernoulli's equation.

Differential pressure and flow can be derived.

The relationship between the two countries and get the traffic. The basic formula is as follows:

c Outflow coefficient dimensionless.

d The diameter of the throttle hole or throat of the throttle under working conditions.

d The inner diameter of the upstream pipeline under working conditions.

qm mass flow kg s

qv volume flow rate m s

diameter ratio d d

The density of a dimensionless fluid is kg m

Expandability coefficient dimensionless.

Orifice flowmeter structure.

Composition of throttling device.

Pressure device: ring chamber, pressure.

Flanges, clamping rings, impulse pipes, etc.

Installation requirements of measuring tube orifice flowmeter: the requirements for the straight pipe section are generally 10d before and 5d after 5d, so the flow meter must be based on the purchase orifice plate.

The on-site industrial and mining situation of the flowmeter is used to select the flowmeter suitable for the on-site industrial and mining situation.

The fluids that fill the pipes, and as they flow through the throttling device inside the pipe, the flow beam will form at the throttle of the throttling device.

Local shrinkage, thus thus.

The flow rate increases.

The working principle of the orifice flow DU meter.

full of pipes zhi

c Outflow coefficient dimensionless d Diameter of the throttle hole or throat of the throttle under working conditions d Upstream pipeline inner diameter qm mass flow rate kg sqv volume flow m s diameter ratio d d density of dimensionless fluid kg m Feiyun instrument 0517-87103369

According to the principle of flow continuity and Bernoulli's equation, the relationship between differential pressure and flow can be deduced to obtain the flow rate.

When the measured fluid (gas or liquid body) fills the pipe and flows through the throttling device, the flow beam will be formed into a local contraction at the throttle, so that the kinetic energy and potential energy of the fluid are converted to each other, so that the flow velocity increases, and the static pressure decreases, so that the pressure difference between the front and back of the throttle is generated, assuming that the fluid in the pipeline is continuous and incompressible, by measuring the pressure difference before and after the throttling device is p, the volume flow rate and mass flow rate flowing through the pipeline can be obtained.

What is an orifice flowmeter and how is the flow rate calculated in industry? Today I know it.