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Anhydrous Ammonia Cylinder storage

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balonglong

Chemical
Nov 19, 2013
1
Hi all. My plant have a anhyrous ammonia storage tank and we vaporise to gas via a vaporiser. I was wonder if it is possible to replace with cylinder storage instead as our vaporizer (both) are having issues. The flow rate required per hour require is 100kg/h.
 
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NH3 has a somewhat low vapor pressure at typical ambient temperature. As such, vapor NH3 stored at ambient temperature will have a low density and a tank just cannot store much quantity. It is possible, but not practical for the long term. Can you do it for a short term to get out of a jam with two bad vaporizers? You'll have to estimate that, because we do not have enough details to figure this out.

Good luck,
Latexman

Technically, the glass is always full - 1/2 air and 1/2 water.
 
give us an idea about the size of the current storage tank, ambient conditions year around to which the tank is exposed,whether the 100 kg.hr is continuous or intermittent. Just a thought about installing a second smaller tank receiving the vapor from the larger tank and repipping from this smaller tank.
 
what temperature and pressure do you require for your process?

i think of ammonia as having relatively "high" vapor pressure for a given ambient temperature. for instance, ~50 psig at 32°F and ~ 197 psig at 100°F.

if you are in a warm climate (e.g., southern florida), you may not need a vaporizer to deliver ammonia at 55 psig. basically, you will gain enough energy through the pressure vessel wall to keep pressure on the system.

if you are Canada and operating in the winter and need 100 psig, you definately need a "heater or vaporizer."

typically i have seen more of a "heater" design where you keep the pressure in the tank by using a "side-arm" heater/vaporizer where you have liquid flow from the bottom of the tank going to the heat source and a vapor balance line back to the top of the tank. i would not recommend a liquid line feeding a separate vaporizer unit if you could avoid it.
 
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