It would probably be a performance based design. I can't remember seeing anything in NFPA but I have seen videos of spherical tank systems being tested.
Here is an excerpt from Fire Engineering Magazine, I don't have the issue or date. "The first method involves the use of a water deluge system and some form of water distributor. This could include high-volume spray heads, perforated pipe, or a distribution weir. An underflow or overflow weir allows water to be evenly distributed over the surface area of a sphere; water flows up the piping network, over the top of the sphere, and out of the weir. This type of water distributor is commonly used but is prone to corrosion from standing water and clogging and requires increased preventative maintenance. Additionally, weirs may not be as effective on bullets and are often greatly affected by wind. The remaining components of this method are similar to other deluge installations. The typical deluge system contains a supply piping network, deluge valve and trim, and branchline-piping network near the top of the sphere. Newer installations are usually activated automatically, whereas older installations are commonly activated manually. The decision of which activation method to use requires evaluation of spacing, available protection, exposures, and other factors. The principle behind the deluge or weir system for LPG sphere protection is that the geometric shape of the sphere and gravity work together as an advantage. As water is applied to the top of the vessel, the shape of the sphere and the force of gravity facilitate the flow of the water as it covers the surface area of the vessel. This type of protection is very effective to facilitate an even distribution of water over the surface area. Caution should be exercised, however, because paint, corrosion, dust, and other environmental influences can cause changes in the surface of the sphere, resulting in uneven water distribution. Additionally, settling and other conditions inside the weir can also cause uneven water flow over the sphere's surface." Ron Fletcher Aero Automatic Phoenix, AZ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Art Tiroly Sent: Wednesday, October 12, 2011 7:40 AM To: [email protected] Subject: RE: Top Spray Deluge nozzle Can you point to anything in NFPA that will allow this design application? Arthur Tiroly ATCO Fire Protection Design Tiroly and Associates 24400 Highland Rd Rm 25, CLE 44143 216-621-8899 216-570-7030 Cell WWW.ATCOfirepro.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Hinson, Ryan Sent: Tuesday, October 11, 2011 1:25 PM To: [email protected] Subject: RE: Top Spray Deluge nozzle I'm looking for a nozzle with a 1½" up to 3" discharge orifice. I think it is something a local shop would have to fab up. Thanks though. Ryan Hinson Burns & McDonnell Direct: 952-656-3662 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Tuesday, October 11, 2011 12:20 PM To: [email protected] Subject: Re: Top Spray Deluge nozzle Tyco still manufactures what was the Grinnell EA-1, although I don't know if they still call it that, which comes in various configurations of spray pattern. On Tue, Oct 11, 2011 at 9:59 AM, Hinson, Ryan <[email protected]> wrote: > Does anyone out there know of a manufacturer of top spray deluge > nozzles which basically flow water at the top of storage spheres for > rundown over the entire storage vessel? I have a client standard > detailing what they are looking for but cannot locate anything online. > > Thank you, > > Ryan L. Hinson, EIT, SET > Senior Fire Protection Engineer, Aviation & Facilities Group Burns & > McDonnell Minneapolis-St. Paul Office > 8201 Norman Center Drive, Suite 300 > Bloomington, MN 55437 > Direct: 952-656-3662 > Fax: 952-229-2923 > [email protected] > www.burnsmcd.com<BLOCKED::www.burnsmcd.com> > > > Proud recipient of PSMJ's Premier Award for Client Satisfaction > > -------------- next part -------------- An HTML attachment was > scrubbed... > URL: < > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attac > hments/20111011/5f47e1b9/attachment.html > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) -------------- next part -------------- An HTML attachment was scrubbed... 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