Selection of high-pressure hydrogenation level gauge
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I would like to ask the experts: I’m facing a challenge in selecting a level transmitter for high-pressure hydrogen applications. The pressure is 200 kilograms, and the temperature is 260 degrees. For the 3-out-of-2 interlock system, all transmitters chosen are of the double-flange type, but I think this isn’t appropriate. Can the diaphragm in a double-flange transmitter withstand such high temperatures? Should a different measurement method be chosen for the third level gauge? Please, experts, help me answer this. Thank you!
1. Diaphragms with double flanges cannot withstand such temperatures. 2. It’s okay to use 3 units of the same type; if the medium is not prone to clogging, I recommend using a regular differential pressure transmitter equipped with a pressure guiding tube and a condenser for measuring the liquid level.
Our design features two level gauges in a two-out-of-two configuration, along with three level switches in a three-out-of-two configuration. The 260-degree double-flange diaphragm you mentioned should be fine; all that’s needed is to choose the appropriate filling fluid for use.
It is said that 300 degrees can now be achieved; the drawback of your approach is that there are many points of leakage, which is not ideal for high-voltage measurement circuits.
The 260-degree double-flange diaphragm poses no issues at all; a high-temperature type of silicone oil should be used, and in northern regions, the capillary tube needs to be insulated to maintain its temperature. High-quality oils are relatively clean; if you want to save money, you can simply use ordinary differential pressure transmitters. It is required to use multiple different measurement methods to determine the same liquid level in tank areas and storage tanks that hold hazardous materials; no special requirements have been observed during the production process. Besides high pressure, there isn’t much else to consider here.
Thank you! High-temperature silicone oil should be chosen. . . You also added a level switch, right? Is that installed on the connecting pipe as well?
Thank you! Is it necessary to fill the transmitter with an isolation fluid if a regular differential pressure transmitter is used?
The level switch must not be located at the same position as the opening for continuous level measurement, for safety reasons
Regarding the question you raised, let me help you answer it: Can the first pair of flange diaphragms withstand such high temperatures? The ability of double-flange differential pressure transmitters to withstand high temperatures depends mainly on the silicone oil used. Ordinary silicone oils can tolerate temperatures ranging from -10 to 250 degrees Celsius, which is sufficient to meet your requirements. If you feel this isn’t reliable enough, you can use ultra-high temperature silicone oil (KN3.2 silicone oil), which can handle temperatures from -20 to 400 degrees Celsius. Since it involves high-pressure hydrogen levels, double flanges are the best choice; moreover, it’s advisable to use 316L gold-plated diaphragms to prevent hydrogen leakage. If you want a specific solution, please send me the relevant parameters via private message and I’ll help you select the appropriate model! :lol:lol
Thank you, I still don’t fully understand what you mean – does the capillary also need to be insulated? Are different measurement methods also required?