Error of double-flange level gauge for 12m storage tank

The accuracy difference between using capillaries and pressure guiding tubes depends on various factors, including the accuracy of installation, temperature changes, the compressibility of the gas, and volume changes in the capillaries. Generally, capillaries have higher precision over short distances, as the compressibility of gas has a lesser impact on the measurement results. However, at a height of 12m, the length of the capillary will be very long, which may increase measurement errors, especially under conditions of large temperature changes. In your application, if you are concerned about errors caused by the length of the capillary, you can consider using a pressure guide tube. A pressure guide tube can reduce the volume of the liquid within the tube, thereby minimizing the impact of volume expansion caused by temperature changes on the measurements. However, the pressure guide tube system also needs to be properly installed and maintained to avoid blockages or gas leaks, as these can affect measurement accuracy. For applications such as high-pressure tanks, radar level gauges are an excellent choice, as they are not affected by pressure or most process conditions, offer high accuracy, and require relatively little maintenance. In summary, if the air guide tube is properly installed and maintained, it may provide more stable measurement results in long-distance applications. However, the specific measurement method to choose requires a comprehensive consideration of factors such as cost, installation conditions, maintenance requirements, and the acceptable level of measurement error. .

If that doesn’t work, just use two single-flange connections, one at the top and one at the bottom, and your concerns will be resolved. And what about the temperature of the material you measured? Should high-temperature silicone oil or low-temperature silicone oil be used? I’m not sure where you are; I’m in the northeast. I’ve used double-flange sensors with longer capillaries for measuring high-temperature media. For high-temperature silicone oil capillaries, heating is required, and pressure transfer tubes also need antifreeze and heating – maintenance is rather complicated, and errors do occur. Sometimes, by moving the capillary manually, the liquid level changes. If there are no issues with the temperature, the accuracy of the transmitter itself is sufficient.

Looking at the question, it is a matter considered from the user’s perspective. It is recommended to follow professional design guidelines. Any additional requirements can only be changed after communicating with the design institute or equipment manufacturer, and after submitting suggestions for improvement to the relevant departments within the organization. Generally, the selection of instruments should be based on actual needs; it is not advisable to pursue precision to an excessive extent at the expense of cost-effectiveness. For reference.

Is the tank at atmospheric pressure? Generally, both double-flange and single-flange types are acceptable; using pressure guide tubes in new projects results in lower costs and a relatively lower failure rate.

We usually use three: differential pressure, radar, and magnetic flap

This post was last edited by liu530014416 on 2024-1-15 22:45. For the ERS level gauge, one could install another cable-guided radar or an external level gauge; as for using pressure transfer pipes or double flanges, I’m not sure what your thoughts are.

If the principle of pressure transmitters is under consideration, an electronic remote-type transmitter (referred to as ERS by Emerson) or what some manufacturers call an \"electronic differential pressure transmitter\" could be an option; two sensors are installed at the pressure measurement points, and these sensors are connected to a single transmitter via cables； Emerson was the first to introduce such products, and currently Yokogawa, ABB, and E+H all seem to have similar products.