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Number Of Nitrogen Swings Requied To Remove Oxygen In Tank


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#1 sns.srinivas

sns.srinivas

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Posted 01 May 2012 - 09:47 PM

Tank volume:50 m3; we have to remove the oxygen % upto lessthan 10 ppma. so how many number of purgings required to eliminate oxygen frm that tank. Initially purge with nitrogen upto 6 kg/cm2g in the tank and vent the tank upto 0.1 kg/cm2 g, is called 1 swing.

#2 Art Montemayor

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Posted 01 May 2012 - 10:16 PM

In my experience, there is no credible calculation that will tell you your answer - it will only be any approximation that will vary with the design of the tank, the internals, the nitrogen purity, the method of applying the purges and the quality of operators. There are so many variables that it is always best to try it out, keep a good record and document it for future applications. This is the gathering of empirical data, and that is always the best and most accurate method.

I have seen far too many sophisticated and "elegant" mathematical equations employed in trying to predict the quantity of nitrogen and number of purges all fail to even come close to the real, actual requirement. Just make sure you have accurate sniffing instrumentation and that it is applied correctly and good representative data is documented.

#3 breizh

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Posted 02 May 2012 - 02:50 AM

Good Day,
To support your query I've attached a resource .As Art mentioned , calculation are calculation and nothing will replace a Sniff test to control the atmosphere with a O2 meter calibrated .

Hope this helps

Breizh




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