Porous orifice flow meter

I know a little about this. I’ve received such orders recently – regarding flow control holes in the center. Since the customer couldn’t determine the specifications, we asked a design institute to help with the calculations. Calculating these holes requires specific qualifications, and they mentioned that there are certain software tools that can be used for such calculations. You can go and ask at the Institute of Automatic Instruments.

This post was last edited by hwindforce on 2010-1-8 at 16:55. It’s a flow balance sensor; provide the specifications to the manufacturer, who will send them to the United States for calculation and then return to you the number and dimensions of the openings required. However, the balanced flow meter is still a relatively new product; it is currently being widely used in new projects across China. As for its actual performance – whether it truly delivers the benefits of streamlining flow, reducing pressure loss, and offering high accuracy – several years of market testing are needed. It’s best not to follow this trend blindly, after all, the price of balanced flow sensors is quite high. I won’t go into further details; you can refer to the origin of bar-type flowmeters.

Is it an O-type flow meter? I. Measurement Principle The O-type flow meter is a flow sensor based on the differential pressure principle. An O-type flow sensor is a disc with multiple orifices, installed in the cross-section of a pipe. The size and distribution of each orifice are determined using specific calculation formulas and the data that need to be measured. When fluid flows through the orifices of the O-type sensor, the flow is balanced and vortices are minimized, resulting in a flow that is nearly ideal. A stable differential pressure signal can be obtained using pressure sensing devices, and the volumetric flow rate or mass flow rate can then be calculated based on Bernoulli’s equation. II. Characteristics of O-type flow meters 1. High linearity and good repeatability. Due to its porous and symmetric structure, along with the large amount of data available on its performance, the O-type flow sensor is capable of balancing the flow field. This reduces eddies, lowers vibrations and signal noise, thereby improving the stability of the flow field. As a result, its linearity is 5–10 times higher than that of orifice plates, while its repeatability improves by 54%, reaching 0.15. In terms of overall performance, the O-type flow meter possesses the characteristics of high-end flow meters and can be used for trade measurement purposes. At a ratio of 5:1, the linearity is ±0.3; at a ratio of 7:1, it is ±0.7; and at a ratio of 10:1, it is ±1.0. 2. Lower requirements for straight pipe sections: Since the O-type flow sensor helps to stabilize the flow field, and pressure recovery occurs twice as fast as with traditional throttling devices, **the requirements for straight pipe sections are reduced. Typically, there is a requirement of 3D in front of and 1D behind the sensor, which saves a significant amount of straight pipe length, especially in cases involving pipes made of special or expensive materials. 3. Permanent pressure loss: Thanks to its porous and symmetric design, this device reduces turbulent shear forces and the formation of vortices, thereby minimizing energy losses. Under the same measurement conditions, it reduces permanent pressure loss by 2.5 times compared to traditional throttling devices, which saves a significant amount of energy costs. It is an energy-efficient instrument that deserves widespread use and promotion. 4. Low risk of clogging: The porous and symmetrical design reduces turbulence and the formation of vortices, thereby **minimizing the creation of dead zones. This ensures that the mixed gas can pass smoothly through the various orifices, allowing for long-term use without easy clogging. 5. It can directly replace traditional throttling devices. The O-type flow sensor has the same installation dimensions and appearance as traditional throttling devices, so it can be replaced directly without any need for changes to the piping or related instruments. It is very suitable for upgrading energy measurement points in industrial facilities, allowing for the replacement of old throttling devices with O-type flow meters. 6. Wide flow measurement range: Based on the experimental results, we found that the measurement performance of O-type flow meters allows for a minimum Reynolds number of less than 200, and a maximum Reynolds number of greater than 107 ； The β value can range from 0.25 to 0.90. 7. Good long-term stability: Due to the significant reduction in turbulent shear forces in O-type flow meters, the direct friction between the medium and the throttling orifice is greatly reduced, allowing the β value to remain constant over time. Since the entire instrument has no moving parts, it can maintain long-term stability. 8. Capable of measuring high-temperature and high-pressure media: Similar to conventional throttling devices, the operating temperature and pressure depend on the material and pressure rating of the pipes and flanges. The O-ring flow meter can operate at temperatures up to 850 degrees, and at pressures up to 42 Mpa. Under such high-temperature and high-pressure conditions, when neither inlet instruments nor instruments with temperature and pressure compensation can meet the requirements, an O-type flow meter can suffice. 9. Capable of measuring media under complex operating conditions: Thanks to its special structural design, it possesses unique properties that enable it to measure gas-liquid two-phase flows, mud, and even solid particles. The O-type flow meter can measure bidirectional flow.

Thank you all. I heard that the current version is very effective, and I was wondering if anyone has used it – could you share your experience?

Hehe, you’ve asked the right question. Our company specializes in manufacturing O-type flow meters. We have also been granted new practical patent certificates for what you mentioned – the porous orifice plate flow meters. These are widely used in various industries across the country, and they perform very well. Our company is Wuhan Tiangang Technology Development Co., Ltd. I’m Li Wenyuan; we’d be happy to exchange ideas if there’s a chance

Pay attention: what is the algorithm like? Once again, it’s a monopolistic algorithm

It’s worth learning*; share more material-related content

How can I get in touch with you? I work at a design institute.

Could you send some materials for everyone’s reference?

That’s right, send some materials over so we can learn together!*learn*!