Ammonia tank level and pressure
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The pressure in the liquid ammonia tank is around 0.7 MPA; it is a horizontal tank with a height of 1.5 meters. We plan to install one new pressure transmitter and one level transmitter on the tank. What model of transmitters would be suitable? Can a Rosemount 3051TG2 be used for pressure transmitters? If feasible, should the material for the isolation diaphragm and the process connection wetted parts be 316L SST or Hastelloy C-276? For liquid level transmitters using double flanges, would it be a good choice to use diaphragm seals made of Tan material?
If a platinum resistor is added as well, what diameter should the protective tube have? What material should be used for the protective tube?
Stainless steel will do~ Liquid ammonia isn’t very corrosive; if you check what material the liquid ammonia storage tank is made of, you’ll understand~
The old unit was a large liquid ammonia tank, equipped with a small refrigerator. I remember that the liquid level was monitored using a radar, while the pressure was measured with a Yokogawa pressure transducer. When I first started working, I went with my supervisor to calibrate the instruments; when closing the shut-off valve and opening the pressure relief valve, a thin layer of ice formed on the outside of the liquid ammonia vaporization diaphragm box. My supervisor would open and close the valve from time to time, explaining that it was to prevent the diaphragm box from being damaged by freezing. It was over 10 years ago; I can’t remember the model. Personal opinion, for reference only.
I use 304 for liquid ammonia applications; if you’re concerned, 316 would be an option. HC-276？ Well? I can only say you’re rich folks; there’s nothing else to say.
What material the container is made of – you can use whatever works for you; in normal situations, it’s rare to use C material. . . . Romon? Rich and promiscuous
There are no special operating conditions either; just use it as usual.
The radar for measuring liquid level seems to be having some issues
Why? Large storage tanks of 5,000–6,000 cubic meters used in 450,000 tons/year ammonia synthesis plants. It’s not the small storage tank like the one mentioned by the poster. There are two in total, along with a small refrigeration unit that operates 24 hours a day to re-liquefy the vaporized ammonia and send it back.