Factors that impact the accuracy of mass flow meters saw by thermal dispersion; the flow profile and its conditioning PART III


We finish this series of articles on mass flow meters talking about the influence of flow conditioners.

Flow conditioners according to straight sections

The multiple disturbances prior to the equipment have a cumulative effect on the flow profile. If it is not possible to have enough straight sections it is advisable to use a flow conditioner.

The flow conditioners can provide a uniform flow profile at the sensor location. This flow profile is different from the flow profile that occurs when we have the optimal straight stretches for the application. It is essential to calibrate the flowmeter with the flow conditioner knowing the details of the location point. With this we refer to: type of gas, characteristics of the pipeline, straight ascending sections available, disturbances and depth.

Flow conditioners of the Sierra brand: If the straight sections are insufficient, the two types of flow conditioners provide a uniform flow profile.

Online flowmeter: For this type the flow conditioner is integrated into the body of the flow meter.

Conditioner for insertion meters: The assembly of two conditioning plates located between two flanges can be effective. The end user is the one who supplies the flanges for this installation

Conditioner for insertion meters

Internal flow conditioner for insertion style meter

 

Importance of flow conditioning

Table 1. This table demonstrates the importance of flow conditioning with the Recommended pipe diameters prior to the equipment.

 

Table 1 shows the length section required in the pipes for a mass flow meter with integrated flow conditioning, compared to an orifice plate.
In all cases, the flow conditioning significantly reduces the recommended distance (straight stretches) prior to the equipment, for a correct installation of the mass meter by thermal dispersion.

Conclusion

Considering Sierra mass flowmeters by thermal dispersion in any application, the location must first be determined with care. It should also be reasoned a posteriori that the most convenient location may not offer the most accurate results. It is important to provide the manufacturer of the thermal mass flow meter, the conditions of application of the end user. That means the data on the pipe, the mixture of gas or gases used, the pressure of the process, and the route as the alterations thereof. In that case the manufacturer will offers us the most appropriate flow meter. The result would be the correct and propitious calibration of the meter in the factory.

For more information contact MATELCO, S.A tel. 93.66.55.553 . You also can use our email form from the contact section.

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