RE: Nitrogen Blanket

From: <Steve>
Date: Wed Mar 12 2003 - 17:20:00 EST

Hi Jim

it has been years since I have done any of this. If the tank is large in relation to the tank contents then you will be interested in equilibrium conditions and Henrys Law.
For small contact times the diffusion rate will be the limiting factor and you will need to grapple with Ficks law, I think. For the equilibrium case have a look at Perry (Chemical Engineers Handbook) 5th edition P14-3 and 7th edition P 14-5 give an example of the solubility of hydrogen in water. The example plus the tables in Perry are probably sufficient to you to solve your problem, if you are familiar with partial pressures and the like.

Cheers

Steve McKenzie

-----Original Message-----
From: Jim Hubbard [mailto:jhubbard@enercon.com] Sent: Thursday, March 13, 2003 4:13 AM
To: PipingDesign
Subject: [PipingDesign] Nitrogen Blanket

I am looking for a calculation to determine nitrogen blanket purity requirements over a deminerailized water storage tank. The nitrogen blanket is being used to limit dissolved oxygen to 10ppb in the water. The calculation would vary inlet water quality and volume in the tank and obviously nitrogen purity.

If you can help, please let me know.

Jim

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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Wed Mar 12 17:20:00 2003