Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question from 2020-11-06
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This post was last edited by It will be better tomorrow on 2020-11-6 07:41 in the Process Engineering Section – Instrumentation and Automation Category – Daily Question – Question No. 2020-11-06. Discussion topic: 288. Please analyze what type of level gauge would be suitable for a liquid ammonia sphere tank with a working pressure of 16 MPa (A)
External-mounted level gauges prevent leaks that occur with hole-based measurement methods.
For liquid ammonia spheres with a working pressure of 16 MPa (A), a sonar-based external level measurement system is the most suitable. Principle of the sonar-based external level gauge: It is a level measuring instrument that utilizes the principle of sonar ranging; it employs micro-vibration sensing and analysis technology to measure the liquid level inside a container from the outside. This \"micro-vibration analysis\" technique enables level measurement without the need to make holes in the tank wall, without the use of flanges, and without any need for welding or cleaning of the tank. It also does not require contact with the liquid or gases inside the tank, allowing for online installation and maintenance. It is therefore a completely non-contact, isolated type of instrument. It is an intelligent field transmitter-type instrument, with the instrument unit installed near the container being measured and the measurement probe mounted on the outer wall of the container. The probe emits and receives sonar signals, which penetrate the container wall to generate echoes in the liquid, thereby enabling distance measurement. When the temperature and composition of the liquid change significantly, it has a substantial impact on the speed at which sonar signals propagate through the liquid, resulting in measurement errors. The patented \"self-calibration\" precision technology addresses this issue by using a section of known length on the tank as a reference to determine the propagation speed under current conditions; real-time compensation adjustments are then made based on these calculations, thereby eliminating the effects of changes in liquid temperature and composition on measurement accuracy. The automatic calibration function ensures high precision in the measurement of instrument levels at all times.
An external-type level gauge can be used. No need to speak, to prevent the release of toxic substances. And ensure the pressure-bearing capacity of the tank itself.
External-mounted level gauges prevent leaks that occur with hole-based measurement methods.
Radar level gauge. Our factory has liquid ammonia tanks rated at 8 bar; why have you set it at 160 bar? Is that necessary?
With such high pressure, an external measuring level gauge is the most suitable choice.