flow meter

Overview:

Anhui Tiankang flowmeterIt belongs to differential pressure flowmeter. It uses the principle of differential pressure measurement of high and low pressure to measure the pressure difference formed between the dynamic pressure upstream and the static pressure downstream of the fluid, in order to achieve the purpose of measuring flow rate. Measure the diameter of the pipeline between DN30 and DN12000. Mainly used for measuring various energy sources such as liquids, fuel gases, vapors, and gases in industrial processes, it has high stability and repeatability. The design theory conforms to the Bernoulli equation principle, has passed the EU CE quality certification, and has been registered through automated design technology.

Purpose and Features

This product has become an ideal replacement for orifice plates due to its advantages of easy installation, low pressure loss, high strength, no wear and tear, and no leakage. It can be widely used for flow measurement of blast furnace gas, compressed air, steam, and other liquids and gases in industrial and mining enterprises.

The internal quadratic average structure of 1 * provides high accuracy (reading ± 1%) and high repeatability (± 0.1%). The outer impact tube is made of a single piece of material without welding points, which naturally has higher strength compared to similar products welded by a double body structure. Moreover, high temperature resistant and corrosion-resistant materials are selected for better protection performance.

The honeycomb shaped hexagonal stable structure produces a beam distribution shape of *, ensuring the stability of low-pressure signals and generating a higher differential pressure than similar products, thereby improving the range ratio.

B is suitable for square or rectangular pipes.

For the inevitable blockage problem of similar products when measuring dirty media, there are online pull-out models or manual and automatic blowing solutions and devices available to achieve non-stop maintenance.

The D-speed averaging tube, three valve group, temperature and pressure compensation, and transmitter form an integrated structure that is easy to use.

No drift in flow coefficient, long-term stability.

F * provides intuitive resonance verification to ensure long-term stable operation.

G has low pressure loss, low energy consumption, and energy efficiency.

This product outputs differential pressure signals and is used in conjunction with instruments for measuring differential pressure. It can accurately measure various liquids, gases, and vapors (superheated vapor and saturated vapor) in corrugated and rectangular pipelines. The size range of the tested pipeline is from 20MM to 3000MM. Anuba has been successfully used in sectors such as power industry (including nuclear industry), chemical industry, petrochemical industry, and metal smelting industry. It is suitable for:

1. Gas transportation and liquid transportation.

2. Energy research, steam boiler heat rate, water pump efficiency, gas compressor efficiency, and fuel consumption.

3. Process control: input-output, ratio, balance; Cooling water or air, steam heating.

parameter

1、 Specification: DN50-DN5000 (mm); Insertion type: DN500-DN5000;

2、 Measurement accuracy: ± 0.5%, ± 0.2%; Repeatability: ± 0.1%;

3、 Range: Volume flow rate: 10:1; 100; 1. Quality flow rate: 8:1;

4、 Work pressure: The average speed tube has no raised function type: ≤ 29.00MPa; Adjustable type of averaging tube: ≤ 10MPa;

5、 Fluid temperature: ≤ 450 ℃;

6、 Medium viscosity: ≤ 30CP (equivalent to heavy oil);

7、 Body material: Sensor, three valve group: all made of 316L stainless steel, alloy steel, Hastelloy, Monel and other materials to choose from;

Accessory material: Flange: 316L stainless steel or carbon steel, alloy steel, Hastelloy, Monel and other materials can be selected;

Introduction to Working Principle

When fluid flows through the probe, a high-pressure distribution area is generated in its front, and the pressure in the high-pressure distribution area is slightly higher than the static pressure of the pipeline. According to the Bernoulli equation principle, the velocity of the fluid increases as it flows through the probe, creating a low-pressure distribution area at the back of the probe. The pressure in the low-pressure distribution area is slightly lower than the static pressure of the pipeline. After the fluid flows through the probe, a partial vacuum is generated at the back of the probe, and vortices appear on both sides of the probe. The cross-sectional shape, surface roughness, and position of the low-pressure tapping hole of the average velocity flow probe are key factors determining the performance of the probe. The stability and accuracy of low-voltage signals play a decisive role in the accuracy and performance of the uniform velocity probe. The Weiliba average velocity flow probe can accurately detect the average differential pressure generated by the average velocity of the fluid. The Weiliba average flow probe has multiple pairs of pressure tapping holes arranged according to certain criteria in the high and low pressure areas, making it possible to accurately measure the average flow velocity.

Required parameters:

1. Measured media: flow measurement of various gases, liquids, and vapor media

2. Temperature of the measured medium: -60 ℃~850 ℃

3. Pressure of the measured medium: -1.0~42MPa

4. The flow rate of the measured medium: calculated based on the medium

5. Viscosity of the measured medium: calculated based on the medium

main advantages

Anhui Tiankang flowmeter(also known as flute shaped averaging tube flow meter) is a new type of differential pressure flow detection component developed based on the principle of pitot tube speed measurement. The products produced by our factory have innovative design, reasonable structure, high precision, low pressure loss, and easy installation and use. With their special advantages, they have gradually replaced orifice plates and other detection components in many occasions. The products have passed provincial appraisal. This product outputs differential pressure signals and is used in conjunction with instruments for measuring differential pressure. It can accurately measure various liquids, gases, and vapors (superheated steam and saturated steam) in circular and rectangular pipelines. The size range of the tested pipeline is from 20mm to 3000mm. Anuba has been successfully used in sectors such as power industry (including nuclear industry), chemical industry, petrochemical industry, and metal smelting industry. It is suitable for:

·Gas and liquid transportation

·Energy research, steam boiler thermal efficiency, water pump efficiency, gas compressor efficiency, and fuel consumption;

·Process control: input/output, ratio/balance; Cooling water or air; steam heating

·Adding materials in the chemical industry

·Load balancing: pumps, compressors, coolers, filters

Advantages (compared to orifice plates)

·High accuracy and good stability

The accuracy of Anuba is ± 1% and the stability is ± 0.1%. It can maintain a very stable differential pressure signal output for a long time, ensuring the mapping relationship between the output differential pressure signal and the pipeline flow rate. This is because factors such as wear, corrosion, and adhesion of oil and dust during use have little effect on the coefficient of the Annubar flowmeter, but these factors increase the flow coefficient of the orifice plate, which can reach over 20%, resulting in errors of over 20%. We can see from this that the accuracy of Anuba is stable over the long term.

Reasonable design, easy installation, and economy

Anuba is lightweight and easy to install and disassemble without the need for lifting tools. Its product line includes options for installation or disassembly without stopping the pipeline being tested. Due to its lightweight and convenient installation and disassembly, Anuba can save you considerable installation costs. For example, when installing a flow meter on a 200mm diameter pipeline, Anuba only has one 150mm long weld seam, while the orifice plate has two 1200mm long welds. In terms of working hours, install oneAnnubarIt only takes 1.5 working hours, while installing one orifice plate requires 12 working hours.

Beneficial for pipeline layout

Anuba is not only suitable for circular pipelines, but also for rectangular pipelines and pipelines buried at any depth below the ground. The length requirement for the straight pipe section upstream and downstream of Anuba is much lower than that of the orifice plate. When installed behind the elbow at a distance of twice the pipe diameter, stable and high accuracy can still be obtained. This is the * advantage of Anuba, which brings great flexibility to the layout design of pipelines, especially large-diameter pipelines, and saves costs

·The pressure loss is small and the energy loss is low. The pressure loss is power loss, and the pressure loss of Annubar only accounts for 2-15% of the differential pressure, while the pressure loss of a general orifice plate accounts for 40-80% of the differential pressure. From the figure below, it can be seen that the pressure loss of Annubar is much smaller than that of an orifice plate. As the pipe diameter increases, the pressure loss of Annubar can be ignored. For example: used on a 1000mm diameter pipelineAnnubarThe annual energy loss is only a few hundred yuan, while when using orifice plates, the annual energy loss can reach more than 20000 yuan, which is very controversial for today's efforts to save energy.

(1) When installing and using, if the straight pipe sections upstream and downstream of the pipeline are not long enough, it is recommended to install Velbar at twice the diameter of the pipeline after the bend. Due to the complex fluid profile after bending the pipe, a slight adjustment of the fluid coefficient K is required. According to relevant data, after adjusting the K coefficient, the measurement accuracy decreased from ± 1% to ± 3%, and the repeatability decreased from ± 0.1% to ± 0.3%. (2) The continuous operation of the power bar fundamentally eliminates the possibility of blockage, but in the following situations, the power bar still needs to pay attention to preventing blockage:

When the pressure tube leaks, the high-pressure area of the probe is damaged, and particles with smaller diameters in the impurities may enter the pressure tapping hole;

When the pipeline is shut down, small impurities may enter the pressure tapping hole due to the Brownian motion of molecules;

When the system is frequently turned on, small particles of impurities may enter the pressure tapping hole at the moment of formation in the high-pressure zone. Over time, this may cause blockage of the probe;

The medium contains a large amount of tar, algae, or fibrous substances, which may also cause blockage of the probe.

Debugging instructions

1. Connect the signal line and power line

2. Open the inlet and outlet valves, and the opening of the inlet and outlet valves should be*

3. Open the stainless steel three valve group balance valve, slowly open the valves at the high and low pressure ends of the orifice plate, and close the stainless steel three valve group balance valve after the fluid passes through the flowmeter.

Installation pipeline conditions: (1) The straight pipe section before and after the throttling element must be straight and there must be no visible bending.

The straight pipe section used for installing throttling components should be smooth. If it is not smooth, the flow coefficient should be multiplied by the roughness to correct for sparsity.

To ensure that the fluid flow forms a fully developed turbulent velocity distribution 1D in front of the throttling element, and to make this distribution uniformly axisymmetric, therefore:

1) The straight pipe section must be circular, and the roundness requirements for the 2D range of the throttling element are very strict, with certain roundness indicators. Specific measurement method:

(A) Measure the inner diameters of at least four pipes on four vertical pipe sections, OD, D/2, D, and 2D, at equal angular distances, and take the average value D. The difference between any single measurement of the inner diameter and the average value shall not exceed ± 0.3%.

(B) After the throttling element, 8 single inner diameter measurements were taken using the above method at the OD and 2D positions. Any single measurement compared to D should not have a maximum deviation of ± 2%.

2) A sufficiently long straight pipe section is required before and after the throttling element, which is related to the form of the local resistance element in front of the throttling element and the diameter ratio β.

3) The length of the straight pipe section between the upstream side of the throttling element and the second resistance element can be taken as half of the listed value in the form of the second resistance element and β=0.7 (regardless of the actual β value).

4) When the upstream side of the throttling element is an open space or a large container with a diameter ≥ 2D, the length of the straight pipe between the open space or large container and the throttling element shall not be less than 30D (15D). If there are other local resistance components between the throttling element and the open space or large container, in addition to the minimum straight pipe length 1 specified for attachment between the throttling element and the local resistance component, the total length of the straight pipe section from the open space to the throttling element shall not be less than 30D (15D).