i didn't realize that the physics of N2 purging is this heavy. ive trouble shoot
and lineup some N2 blanketing/inerting system for our above storage tank and
know what - most of the time the control valves doesnt work properly (out of
calib.). Operation dont mind since they're interested only that a slight
positive pressure is maintained.
>
> Hi Jim,
>
> We have had a similar issue on one of our DM Water tanks.
> You could contact Fisher Rosemount. They can size / spec. these valves for
> you.
> You could also visit www.totaltankmanagement.com for additional info.
> Hope this helps.
>
> Regards,
> Nitin
>
>
>
>
>
> >From: "Steve McKenzie" <Mechproj@xtra.co.nz>
> >Reply-To: <a href="/group/PipingDesign/post?postID=kaCa6YQTpipYHkiVELojGtcfSt7RmG3FGvK_PwJH6qI2oOZVOwv6zbUA5mEThOVM-G3KTtX5s6fdrCHJrbOggZUr">PipingDesign@yahoogroups.com</a>
> >To: <PipingDesign@yahoogroups.com>
> >Subject: RE: [PipingDesign] Nitrogen Blanket
> >Date: Thu, 13 Mar 2003 11:20:51 +1300
> >
> >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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-- _______________________________________________ Sign-up for your own FREE Personalized E-mail at Mail.com <a href="http://www.mail.com/?sr=signup">http://www.mail.com/?sr=signup</a>Received on Sat Mar 15 12:06:00 2003
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