A relatively simple solution that is less costly than a connected reserve bottle of N2 is to have an ASME pressure vessel with air or nitrogen as a smaller capacity connected reserve; when the low air switch goes off because the N2 tank is empty, you close the valve and install the protective cap atop the N2 bottle and get it refilled; open the valve from the little tank of air or nitrogen and you've got the interim supply until the gas supplier shows up with the new tank, or the maintenance guy gets tired of hearing the bottle roll around in the back of his pickup and gets it refilled and re-installed.
And chris- isn't Air comprised of 72% N2, 22% O2, and the balance a mix of rare gases, smog, and the stench of NAHB propaganda? >From Wiki: Dry air contains roughly (by volume) 78% nitrogen, 21% oxygen, 0.93% argon, 0.038% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. Ok, Chris was closer and I owe him a beer next time I go ice fishing. Fitter training session going on today in Minneapolis, in case you didn't know what the non-signatory guys were up to today. Small industry, eh? glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Scott A. Futrell Sent: Friday, March 26, 2010 10:15 AM To: [email protected] Subject: RE: Nitrogen Chris, I've used and specified nitrogen without problems especially as a backup for dry and special hazard systems. Agree with Ron that the biggest problem is making sure the cylinders are replaced. John D. provided some information on nitrogen generation systems (that are spendy), but yet another option. Scott Futrell (763) 425-1001 Office (612) 759-5556 Cell -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Cahill Sent: Friday, March 26, 2010 8:48 AM To: [email protected] Subject: Nitrogen I was under the impression we talked about nitrogen in dry systems was a challenge because it leaked where plain air would not. I searched the last few years of the forum and couldn't find any such discussion. But air is 80% nitrogen so maybe not a significant difference? How many of you have tried nitrogen and did you or do you still have leaking problems? Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
