Weiliba flow meter

1# KUIK: Is the Veritas flow meter you mentioned also known as an Aluba flow meter? The transliteration might be different. Aluba flow meters are mainly used for measuring gas flow in pipelines with a diameter of DN500 or larger, but they have high requirements regarding the medium to be measured – there should be no sticky dust present.

2# tong6301 also belongs to orifice plate flow meters; the only difference is the shape of the throttling device.

3# gaoyuan_buct should belong to the average velocity tube flow meter!

Generally used for large pipes and high-flow clean media

Weiba Flow Meter 　　　1. Applications 　Suitable for high-precision flow measurement of gases, liquids, and steam. Weiliba is a differential pressure, average velocity type flow sensor that measures flow rate based on the differential pressure generated by the sensor within the fluid. The Velibra 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 generates a very stable, pulse-free differential pressure signal. 2. Design features of the probe: Probes with a head section of a specific shape enable accurate pressure distribution, as well as a fixed fluid separation point ； The low-pressure pressure taps located on both sides behind the probe, in front of the fluid separation point, can generate a stable differential pressure signal and effectively prevent clogging. The internal integrated structure prevents signal leakage, enhances the strength of the probe structure, and maintains high precision over the long term. 　　3. Anti-clogging design of the VeriBa probe: With its excellent anti-clogging design, the VeriBa flow probe eliminates completely the problem of clogging that plagues insert-type flow probes such as those from Anubaa, thereby raising the anti-clogging performance of average velocity tube flow probes to an unprecedented level. 　　The high-pressure pressure tapping hole of the probe is not blocked; a high-pressure zone is formed at the front of the probe, with a pressure slightly higher than the static pressure in the pipeline, which prevents particles from entering. Please note: the fluid velocity at the high-pressure pressure tap of the probe is zero, and no substances will enter the pressure tap. At startup, driven by the static pressure in the pipeline, the fluid enters the elbow and quickly reaches a state of pressure equilibrium. Once a state of pressure equilibrium is established, the fluid encounters high pressure at the inlet of the elbow and takes an alternate path, failing to enter the elbow any longer. 　　The low-pressure orifice of the Weiliba ensures effective prevention of clogging; under normal conditions, dust, sand, and particles accumulate at the back of the probe due to the action of vortex shedding forces. This is why the autumn leaves are always concentrated behind houses that are sheltered from the wind. In other probes, since the low-pressure pressure tap is located in the vacuum area at the rear of the probe, under the action of the vortex street force, this low-pressure pressure tap is quickly blocked by impurities carried by the eddies. The unique design of the Weiliba features low-pressure pressure taps located on both sides at the rear of the probe, in front of the fluid separation point and the wake region. This design inherently prevents clogging and generates a very stable low-pressure signal. 　　4. Advantages of the probe ● Can measure various media, offering a wide range of applications. ● High precision and large measurement range ratio. ● The pressure-taking holes in the probe are inherently resistant to blockage. ● Stable measurement signals with minimal fluctuations. ● Low permanent pressure loss in pipelines. ● Unique high-strength **single-piece dual-chamber structure. ● Low installation costs and virtually no maintenance required. ● Can be installed and repaired online. 5. Features of the Wilo venturi flow sensor ● Stable signals. ● Wilo’s low-pressure pressure-taking holes are located on both sides of the probe, at the point where the fluid separates from the probe, thus staying away from areas subject to vortex fluctuations. 　　● Exceptional long-term high precision 　　Weiba ensures long-term stability of precision due to the following reasons: 　　(1) It is not affected by wear, dirt, or oil contamination. 　　⑵. There are no movable parts in its structure. 　　⑶The design prevents the occurrence of blockages. At the front of the probe, a high static pressure zone surrounds it, preventing the high-pressure pressure tap from becoming clogged. Most importantly, the low-pressure ports are located on both sides of the probe side, with the fluid flowing obliquely across the surface; this prevents the low-pressure ports from being affected by the flow. In contrast, other probes are prone to clogging, as their low-pressure ports are situated in areas where impurities accumulate and cause pressure fluctuations. 　　● Minimum installation cost ⑴. Only a few inches of wiring need to be welded, making the installation very simple and quick. 　　⑵. Special tools can be used to enable installation while the system is under pressure. 　　⑶. All valves and the interfaces of various instruments require only simple assembly, resulting in very low assembly costs. 　　● Very low operating costs 　⑴. It features a non-constricting throttling design; as an insert-type flow probe, Veribea has the lowest operating costs. 　　⑵. The Veribar generates only very low permanent pressure losses, typically less than 0.7 KPa. ⑶. A orifice plate element results in permanent pressure losses of over 14 KPa. ⑷. Compared to orifice plates, the energy loss with the Veribar is reduced by 95%. 　　● The advantage of continuous operation of the Veriba eliminates the possibility of blockage altogether. However, the Veriba still needs to be protected against blockage in the following situations: (1) When the pressure lead pipe leaks and the high-pressure balance area of the probe is disrupted, smaller particles among the impurities may enter the pressure sampling hole. 　　⑵. When the pipeline is shut down, due to molecular Brownian motion, small-particle impurities may enter the pressure tapping holes. 　　⑶. The system shuts down and starts up frequently; at the moments when high pressure is generated, small particles of impurities may enter the pressure sampling holes. Over time, this can lead to blockages in the probes. 　　⑷The medium may contain large amounts of tar, algae, or fibrous substances, which can also cause blockages in the probe. 　　6. Application of new technologies: The uniquely designed connector with a valve, the Wilpa… A completely new design concept that features an internal shut-off valve in the connector of the instrument. 1. This makes installation and maintenance simpler. 　　2. Reduce the number of assembly components to lower hardware connection costs. 　　Quick installation system; easy insertion and removal. ● The sealed drive system prevents damage to components. ● It can be used for installing multiple probes. The entire installation process takes no more than 1 hour. II. Main technical specifications: 1. Performance specifications of the VeriBa flow measurement system: Measurement accuracy: ±1%; Repeatability: ±0.1%. Applicable pressure range: 0–40 MPa; Applicable temperature range: –180°C to +550°C. Upper measurement limit: Dependent on the strength of the probe; Lower measurement limit: Dependent on the required minimum differential pressure. Ratio of measurement range: Greater than 10:1. Applicable pipe diameters: 38 mm to 9,000 mm, for both circular and square pipes. Applicable media: Full-flow conditions, unidirectional flow, gaseous substances, steam, and liquids with a viscosity of no more than 10 centipoise. The VeriBa has a wide range of applications, being used extensively in the measurement of various gases, liquids, and vapors. The following are some typical application media. 　　Gas/Liquid/Vapor Natural gas/Cooling water/Saturated vapor Compressed air/Boiler water/Superheated vapor Gas/deionized water Gaseous hydrocarbons/Liquid hydrocarbons Hot air/Low-temperature liquids Generator gas/Heat-conducting liquids III. Brief introduction to the working principle of Wilo pumps When a fluid flows through the probe, a high-pressure zone is created in front of it; the pressure in this high-pressure zone is slightly higher than the static pressure in the pipeline. According to the principles of Bernoulli’s equation, as the fluid flows past the probe, its velocity increases, resulting in a low-pressure area behind the probe; the pressure in this low-pressure area is slightly lower than the static pressure in the pipeline. As the fluid flows past the probe, a partial vacuum is created at the back of the probe, and vortices appear on both sides of it. The cross-sectional shape of the constant flow rate probe, its surface roughness, and the location of the low-pressure pressure tap are key factors determining the probe’s performance. The stability and accuracy of low-voltage signals play a decisive role in the precision and performance of constant-speed probes. The Weiba average velocity flow probe can accurately detect the average differential pressure generated by the average velocity of the fluid. The VeriBa average velocity flow probe features multiple pairs of pressure taps arranged according to specific criteria in both high-pressure and low-pressure areas, enabling accurate measurement of the average flow velocity. IV. Measurement principle of the VeriBa flow meter The ZY-HLV VeriBa flow meter is an insert-type flow measurement instrument. A Wirbel sensor is inserted into the pipe; when the fluid flows past the sensor, a high-pressure zone is created in the flow direction in front of it, while a low-pressure zone is formed behind it. The sensor has multiple pairs of pressure tapping holes arranged in a specific pattern in the high-pressure and low-pressure areas; usually there are three pairs. These holes are used to measure the total pressure of the fluid, which includes the static pressure and the dynamic pressure associated with the average velocity, namely Pl and P2 respectively. P1 and P2 are introduced into the differential pressure transmitter respectively, and the differential pressure △P = P1 – P2 is measured. △P reflects the magnitude of the fluid’s average velocity, and from this the flow rate of the fluid can be calculated. 　　V. Characteristics of Velibra ● Stable signal The low-pressure pressure tapping holes of Velibra are located on the sides behind the probe, between the fluid and the probe, far away from the area where vortex fluctuations occur. 　　● Exceptional long-term high precision 　　Weiba ensures long-term stability of precision due to the following reasons: 　　(1) It is not affected by wear, dirt, or oil contamination. 　　⑵. There are no movable parts in its structure. 　　⑶The design prevents the occurrence of blockages. At the front of the probe, a high static pressure zone surrounds it, preventing the high-pressure pressure tap from becoming clogged. Most importantly, the low-pressure ports are located on both sides of the probe side, with the fluid flowing obliquely across the surface; this prevents the low-pressure ports from being affected by the flow. In contrast, other probes are prone to clogging, as their low-pressure ports are situated in areas where impurities accumulate and cause pressure fluctuations. 　　● Minimum installation cost ⑴. Only a few inches of wiring need to be welded, making the installation very simple and quick. 　　⑵. Special tools can be used to enable installation while the system is under pressure. 　　⑶. All valves and the interfaces of various instruments require only simple assembly, resulting in very low assembly costs. 　　● Very low operating costs 　⑴. It features a non-constricting throttling design; as an insert-type flow probe, Veribea has the lowest operating costs. 　　⑵. The Veribar generates only very low permanent pressure losses, typically less than 0.7 KPa. ⑶. A orifice plate element results in permanent pressure losses of over 14 KPa. ⑷. Compared to orifice plates, the energy loss with the Veribar is reduced by 95%. 　　1. Preparatory work before operation 　　① Correct sensor installation: 　　After installing the sensors on the pipeline, a thorough inspection must be carried out before operation; it is necessary to ensure that the welding is secure, the orientation is correct, there are no leaks, and the insertion depth is appropriate. 　　②Instrument calibration: The instruments associated with sensors include differential pressure transmitters and intelligent flow accumulators (pressure transmitters and temperature transmitters may also be present). All must be tested and calibrated before they can be put into use. The measurement range of the instrument must meet the requirements of the sensor and the medium being measured. For example, if the maximum flow rate of the air being measured is Qmax=5000 m3/h, and the calculated maximum differential pressure generated by the sensor is △Pmax=0.6 Kpa, then the measurement range of the differential pressure transmitter should be set to 0~0.6 Kpa, with a corresponding output current signal of 4~20 mA. For general-purpose flow integrators, it is necessary to pre-program and configure them based on factors such as the real-time flow range, differential pressure range, medium density, temperature, pressure, and flow calculation requirements, to ensure that the integrator can correctly calculate and display the flow rate. 　　③The instrument wiring is correct: The sensor, together with the differential pressure transmitter, flow integrator, and other components, forms a measurement system. The power cables for the various instruments, as well as the signal input and output wires between them, and the wires for control and alarm functions, are all clearly marked on the wiring panels (also known as terminal boards) of each instrument. It is essential to identify these wires correctly and use them appropriately; before putting the instruments into operation, their wiring must be checked thoroughly to ensure there are no errors. To prepare properly for commissioning, in addition to carefully reading the \"Weiba Flow Meter User Manual,\" it is also necessary to read documents such as the \"Differential Pressure Transmitter User Manual\" and the \"Intelligent Flow Totalizer User Manual,\" and to carry out work in accordance with the instructions provided in these manuals. 　　The Wiliba flowmeter falls under the category of differential pressure averaging tube flowmeters; both types measure fluid flow by utilizing the pressure difference between the fluid before and after passing through the flowmeter. Therefore, when selecting and ordering a flowmeter, it is necessary to take into account the following parameters: 1. Pipe diameter; 2. Properties of the fluid; 3. Pressure of the fluid in the process pipeline; 4. Temperature of the fluid in the process pipeline; 5. Flow rate of the fluid; 6. Conditions at the installation site

They are all differential pressure flow meters; the only difference lies in the formula used to convert the differential pressure into flow rate. Overall, they represent an improvement over orifice plates

We’re using it, and it’s fairly stable for use in steam pipes.

It is essentially a steel pipe with a hole inserted into the pipeline, creating a pressure difference between the front and back; data is obtained through a pressure difference transmitter. It is a type of differential pressure flow meter. Installation generally comes in two types: threaded and flanged. 1) The pressure loss is low, with little differential pressure before and after; the smallest range setting of the transmitter should be selected. 2) For large-diameter pipelines, attention should be paid to resonance.

It is an insert-type differential pressure flow meter that uses dry pressure detection; since the dry element exerts very little resistance to the fluid flow relative to the pipeline, a short straight pipe section is required, and most importantly, the pressure loss is extremely low； The differential pressure signal from poor-performing sensors is not as large as that from orifice plates; therefore, higher requirements are placed on the transmitters and the parameters at the installation site, but the performance achieved is indeed much better than that of orifice plates

The imported V-series Wellbar® flow meters, represented by Shanghai Hongke Automation Instrument Co., Ltd., are also known as average velocity tubes, Anuba, Aliba, Wiliba, Weiliba, Wilba, or Toba tube flow meters. They are a new type of insert-type flow measurement instrument designed and manufactured using the differential pressure principle. The Wellbar® flow sensor, combined with a differential pressure transmitter, a flow integrator, and optional compensation temperature and pressure sensors, constitutes the highest-quality differential pressure flow measurement system available today. The Wellbar® flow sensor was developed by studying the advantages and disadvantages of previous differential pressure sensors, and by incorporating the latest findings in aerodynamics and fluid dynamics; it represents the latest advancements in average velocity tube flow sensors. The cross-sectional shape of the Wellbar® flow sensor probe is head-shaped, enabling the generation of accurate and stable differential pressure signals ； High strength, leak-proof, and clog-resistant ； It features high measurement accuracy, reliability, and good stability. It can measure various fluids such as gases, liquids, and vapors. □ Working principle: The Wellbar® flow meter, like differential pressure flow sensors such as orifice plates, operates in accordance with Bernoulli’s equation: , where Q represents the volumetric flow rate in the pipeline ； C=flow constant ； ΔP = differential pressure value. When a Wellbar® flow sensor probe is inserted into a pipeline, as the fluid flows past the probe, a high-pressure area is created in front of it (in the direction of flow), while low-pressure areas form on both sides behind it. A partial vacuum and an area where impurities accumulate are created behind it, and vortices also form on both sides. The Wellbar® flow sensor probe is equipped with multiple pairs of pressure tapping holes arranged in a specific pattern (usually 3 pairs), which are used to measure the pressure at each point along the pipeline axis. The total pressure of the fluid at multiple points ahead of the probe (in the direction of flow) gives the average high pressure P1, which includes the average of the dynamic pressure – also known as velocity pressure – and the static pressure at each point ； The pressure tapping hole in the low-pressure area measures the average of the static pressures at multiple points on its side wall, which represents the average low-pressure value P2. P1-P2=△P; therefore, △P represents the pressure corresponding to the average velocity of the fluid, that is, the magnitude of the average flow velocity, and this value can be used to calculate the flow rate of the fluid. □ Key features: High-strength structure: The Wellbar® flow sensor features an integrated dual-chamber stainless steel construction that is wear-resistant and corrosion-proof, eliminating the leakage between chambers and the risk of failure associated with the multi-chamber design of other types of average velocity tube flow sensors. This enhances the overall strength of the sensor, reduces the likelihood of it breaking, ensures long-term accuracy, and helps to increase the upper limit of its measurement range. Multi-point pressure extraction method: The Wellbar® flow sensor features multiple pairs of pressure extraction holes arranged according to certain criteria in both high and low pressure areas. The spacing between these holes is determined through area integration, enabling accurate detection of the average differential pressure generated by the average velocity of the fluid ； The true flow rate can be measured with high accuracy even when there is insufficient straight pipe section or significant fluid fluctuations. **Head cross-sectional shape: The probe of the Wellbar® flow sensor is manufactured using a special process, resulting in a head cross-sectional shape that experiences minimal pulling forces. This allows for an accurate pressure distribution, thereby fixing the separation point between the fluid and the sensor. Front surface roughening treatment: The metal surface at the front of the Wellbar® flow sensor probe is roughened. Based on aerodynamic principles, when fluid flows over a rough surface, a stable turbulent boundary layer is formed, which helps improve the measurement accuracy at low flow rates. This allows the probe to generate stable and accurate differential pressure signals even at low flow speeds, thereby extending the lower limit of the sensor’s measurement range and maintaining stability in the flow coefficient. Inherent anti-clogging design: The inherent anti-clogging design of the high and low pressure tapping holes in the Wellbar® flow sensor elevates the anti-clogging performance of the venturi flow sensor to a whole new level. When the Wellbar® flow sensor is first put into operation, under the effect of the static pressure in the pipeline, the fluid begins to flow into the high-pressure pressure-taking holes located at the front of the probe (in the direction of flow). It’s similar to placing a bottle with a neck into a pool of water – a pressure balance is quickly established, resulting in a high-pressure area at the front of the probe. The fluid and any particulate impurities present do not enter these high-pressure pressure-taking holes; instead, they flow around them and disperse towards both sides of the probe. This creates a vortex at the rear of the probe. Under normal circumstances, the particulate impurities, driven by the force of this vortex, accumulate at the rear of the probe, just as leaves always fall in the sheltered area away from the wind. Since the low-pressure pressure-taking holes are located on the sides and rear of the probe, ahead of the fluid separation point and the area where impurities gather, this arrangement effectively prevents blockages and signal fluctuations caused by vortices, thereby producing a very stable low-pressure signal. □ Performance analysis allows for the measurement of various fluids, and it has a wide range of applications: The Wellbar® flow sensor can measure various liquids, gases, and vapors that fill pipes and can be considered single-phase, such as pure water, tap water, raw water, condensate, etc., as well as air, gas from coke ovens, blast furnaces, natural gas, nitrogen, oxygen, etc., saturated steam, superheated steam, and so on ； Suitable for round tubes, square tubes, and rectangular tubes of various sizes ； Special materials can be selected to suit environments with high temperatures, high pressures, corrosion, etc. High precision and large range ratio: The Wellbar® flow sensor typically has a precision of ±1% and a repeatability of ±0.1%, with a range ratio of over 10:1 ； Under special conditions, the accuracy can reach ±0.5%, and the range ratio can reach 60:1. The measurement signal is stable with minimal fluctuations: The unique head geometry resulting from Wellbar® flow sensors’ specialized manufacturing process, along with the special location of the low-pressure pressure tapping holes and the multi-point pressure sensing method, ensure that the probe can generate a stable and accurate differential pressure signal even at low flow rates. Low permanent pressure loss in pipelines: The formula for the power loss caused by the pressure loss of throttling elements is: W=δ×Q, where W represents the power loss ； Pressure loss of δ—throttle element ； Q—Volumetric flow rate of the fluid passing through the throttle element. According to the empirical formula for pressure loss in orifice plates: when β=0.6, δ=0.6×△P. Here, β is the orifice diameter ratio ； Pressure loss of δ—throttle element ； △P—The differential pressure value generated. The permanent pressure loss of the Wellbar® flow sensor is δ≤0.03×△P. As can be seen from the above formula, the differential pressure generated by the orifice plate is greater than that produced by the Wellbar® flow sensor; moreover, its permanent pressure loss inevitably reaches 60% of the differential pressure ； The Wellbar® flow sensor, due to the substantial reduction in its flow resistance area, also results in a pressure loss that is dozens of times lower – only 3% of the differential pressure. Low installation costs and virtually no maintenance required: Installing a Wellbar® flow sensor only involves simple welding; the length required varies from 40 to 200 mm depending on the sensor’s specifications, and it is independent of the pipe diameter. This results in costs that are many times lower compared to the welding required for orifice plates, which necessitates welding around twice the circumference of the pipe. For example. To install Wellbar® flow sensors on pipes ranging from DN100 to DN1000, only about 100 mm of welding is required; in contrast, orifice plates necessitate 600 to 6000 mm of welding. In large-scale pipeline installations, orifice plates still require equipment such as cranes due to weight issues, whereas the Wellbar® flow sensor can be installed with just 1 to 3 workers. In comparison, the Wellbar® flow sensor can save more than 80% on installation costs. According to the installation tests, it takes 15 minutes to open holes for the Wellbar® flow sensor, 30 minutes to weld the mounting base, and 15 minutes to fix the sensor; the entire process takes no more than an hour. Even when installing it online without shutting down production, the total time required is only about one and a half hours. Online installation and maintenance are possible: For certain measurement points where shutdown for installation is not feasible, or for fluids with high impurity levels, the online installation version can be used. Within the flow rate, temperature, and pressure limits permitted by the sensor, installation and measurement can be carried out online without shutting down production, and cleaning and maintenance can also be performed without interrupting operations. □ Key technical specifications: Measurement accuracy: ±1.0%; Repeatability accuracy: ±0.1%. Range ratio: Greater than 10:1. Applicable pressure: 0–25 MPa; up to 40 MPa in special cases. Applicable temperature: -100°C–500°C; up to 800°C in special cases. Upper measurement limit: Determined by process requirements and probe strength. Lower measurement limit: Dependent on the minimum differential pressure requirement (see table below); a special design can be used when the differential pressure is below this minimum value. Fluid Minimum differential pressure (Pa) Minimum flow velocity (m/s) Liquids 260 0.6 Gases 26 4.5 Steam 400 9.7 Applicable pipe diameter: 8mm–15000mm Applicable fluids: fully filled pipes, single-phase or gases that can be considered single-phase, as well as liquids with a viscosity of no more than 10 centipoise ； It cannot be used to measure two-phase or three-phase fluids. Straight pipe section requirements: usually 7D in front and 3D behind.