1、 Overview of Pipeline based Velbar Flow Meter:
The pipeline type Velbar flowmeter adopts an engineering structural design that fully complies with aerodynamic principles, and is a sensing element that has achieved unparalleled excellence in accuracy, efficiency, and reliability.
1. Application of pipeline type Velbar flowmeter
The pipeline type Velbar flowmeter is suitable for high-precision flow measurement of gases, liquids, and vapors. The Weiliba flowmeter is a differential pressure and rate averaging flow sensor that measures flow by measuring the differential pressure generated by the sensor in the fluid. The Velbar flowmeter reflects the true flow velocity of the fluid, with an accuracy of ± 1.0 and a repeatability of ± 0.1. The outstanding advantage of Weiliba is that it outputs a very stable and pulsation free differential pressure signal
2. Design features of the probe
The probe with a bullet head cross-sectional shape can generate precise pressure distribution and a fixed fluid separation point; The low-pressure tapping holes located on both sides behind the probe and before the fluid separation point can generate stable differential pressure signals and effectively prevent blockages. The internal integrated structure can avoid signal leakage, improve the strength of the probe structure, and maintain long-term high accuracy.
3. Powerbar probe anti blocking design
The pipeline type power flow meter probe, with its excellent anti blocking design, completely eliminates the disadvantage of easy blockage of insertion flow probes such as Anuba, and achieves an unprecedented level of anti blocking for the averaging tube flow probe.
The high-pressure tapping hole of the probe will not be blocked, forming a high-pressure zone at the front of the probe. The pressure is slightly higher than the static pressure of the pipeline, preventing particles from entering. Please note that the fluid velocity at the high-pressure tapping hole of the probe is zero, and no object will enter the tapping hole. When starting up, the fluid enters the bend under the static pressure of the pipeline, quickly forming a state of pressure equilibrium. After the pressure equilibrium state is formed, the fluid encounters high pressure at the inlet of the bend, detours and no longer enters the bend.
The low-pressure hole of the pipeline type power bar flowmeter achieves intrinsic blockage prevention. In general, dust, sand, and particles are concentrated at the rear of the probe under the action of vortex force. That's why autumn leaves always gather behind windward houses. Other probes have low-pressure pressure tapping holes located in the vacuum zone at the tail of the probe. Under the action of vortex forces, the low-pressure pressure tapping holes of the probe are quickly blocked by impurities brought by eddy currents. The unique design of the Weiliba flowmeter allows the low-pressure tapping holes to be located on both sides of the probe side, at the front of the fluid separation point and wake area. This design fundamentally prevents blockage and can generate a very stable low-voltage signal.
4. Advantages of the probe:
Can measure multiple media and has a wide range of applications
High precision and large range ratio
The probe pressure hole is inherently anti blocking
● Stable measurement signal with minimal fluctuations
Low permanent pressure loss of pipeline
● Unique high-strength bullet shaped single piece dual cavity structure
Low installation cost, basically maintenance free
● Can be installed and maintained online
5. Characteristics of the Velbar Velocity Tube Flow Sensor
● Stable signal
The low-pressure tapping holes of the Weiliba are located on both sides behind the probe, between the separation point of the fluid and the probe, away from the vortex wave area.
Excellent long-term high precision
The pipeline type power bar flowmeter can ensure long-term stability of accuracy because:
⑴. It is not affected by wear, dirt, and oil stains.
⑵. There are no movable parts in the structure.
⑶. The design eliminates the occurrence of blockage. At the front of the probe, a high static pressure zone surrounds the probe to prevent the high-pressure tapping hole from being blocked. The most important thing is that the low-pressure hole is located on both sides behind the probe, and the fluid flows diagonally across the surface, protecting the low-pressure hole from being swept away. Other probes are prone to blockage because their low-pressure tapping holes are located in the low-pressure fluctuation area where impurities accumulate.
The lowest installation cost
⑴. Only a few inches of line welding is needed to complete the installation, which is very simple and fast.
⑵. By using specialized tools, online installation under pressure can be achieved.
⑶. All valves and interfaces for various instruments only require simple assembly, which requires very low assembly costs.
The pipeline type Velbar flowmeter has very low operating costs
⑴. It is a non constricting throttling design, and as an insertable flow probe, the operating cost of the Powerbar is the lowest.
⑵. The Velbar flowmeter only produces very low permanent pressure loss, typically less than 0.7KPa
⑶. The permanent pressure loss generated by an orifice plate component exceeds 14KPa
⑷. Compared to orifice plates, the energy loss of Powerbar has been reduced by 95%.
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 blockage prevention:
⑴. When the pressure tube leaks, the high-pressure equilibrium zone of the probe is damaged, and particles with smaller diameters in the impurities may enter the sampling area
Pressure hole.
⑵. When the pipeline is shut down, small impurities may enter the pressure tapping hole due to the Brownian motion of molecules.
⑶. The system frequently starts and stops, and at the moment of formation in the high-pressure zone, small impurities may enter the pressure tapping hole. Over time, this may cause blockage of the probe.
⑷. The medium contains a large amount of tar, algae, or fibrous substances, which may also cause blockage of the probe.
6. Apply new technologies
The original design with a valve joint has great power A brand new design concept provides a completely new concept, with a built-in instrument shut-off valve at the joint of the instrument
1 . Make installation and maintenance easier.
2 . Reduce the number of assembly components and make hardware connections
Cost reduction.
Quick installation system
Quick insertion and extraction
The sealed drive system can avoid damaging components
● Can be applied to the installation of multiple probes separately
All installations should not exceed 1 hour
2、 Main technical indicators of pipeline type power bar flowmeter
1. Performance indicators of pipeline type power bar flowmeter measurement system
1) Measurement accuracy: ± 0.5~1% Repeatability accuracy: ± 0.1
2) Applicable pressure: 0-40MPa Applicable temperature: -100 ℃ -+500 ℃
3) Measurement upper limit: determined according to process requirements and probe strength; Measurement lower limit: depends on the minimum differential pressure requirement for measurement. When it is lower than the minimum differential pressure, special design can be used to meet the requirements.
fluid
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Minimum differential pressure
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Minimum flow rate
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gas
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0.026KPa
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4.5m/s
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liquid
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0.260KPa
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0.6m/s
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steam
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0.400KPa
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9.7m/s
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4) Range ratio: Under the condition of ensuring accuracy requirements, the range ratio is 10:1; When using a multi parameter transmitter, the range ratio can reach 1:60~100
5) Applicable pipe diameter: 38mm~9000mm round pipe, square pipe
6) Applicable media: gases, vapors, and liquids with a viscosity of no more than 10 centipoise flowing unidirectionally in a full tube
7) Straight pipe section requirements: Generally, the straight pipe section before and after the flowmeter requires a front 7D and a rear 3D
2. The application range of the Velbar flowmeter is extremely wide, widely used for measuring various gases, liquids, and vapors. The following are typical application media.
Gas/liquid/vapor; Natural gas/cooling water/saturated steam; Compressed air/boiler water/superheated steam; Gas/desalinated water; Gas hydrocarbons/liquid hydrocarbons; Hot air/low-temperature liquid; Furnace gas/heat transfer liquid
Selection of pipeline type power bar flowmeter:
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Type spectrum
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describe
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CSHLV-
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verabar
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Installation form
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C
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plug-in
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G
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Pipeline type (not suitable for large diameters)
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caliber
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DN -
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PIPE SIZE
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nominal pressure
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1
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0.6 MPa
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2
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1.6 MPa
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3
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2.5 MPa
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4
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4.0 MPa
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? T
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?
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Special pressure
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operation temperature
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1
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Normal temperature~+250 ℃
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2
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Below 450 ℃
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T
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Special customization
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Media Type
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Y
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liquid
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Q
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gas
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J
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steam
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attachment
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00
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Without attachments
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C
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Equipped with differential pressure transmitter
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CL
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join in marriagedifferential pressure transmitterandFlow totalizer
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DC
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Equipped with multi parameter transmitter
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