Hi Todd, We have many older editions of NFPA 13 here at the Academy (we could always use more if you know of any out there). However, I suprised myself to discover that we have an extremely limited number of older NFPA 14 standards. (So we REALLY need more if anyone has any. We recently recieved some from Thom McMahon in Steamboat Springs.... THANKS THOM!!!) We have one of the original NFPA 14 documents from 1917 (approved 1915 by the membership). We also have a 1918 edition of the Fire Protection Handbook that was edited by EU Crosby and others (dedicated to UC Crosby). These guys STARTED the NFPA!! The 1917 edition of NFPA 14 does not mention a minimum pressure but does mention that the pipe schedule sizes are based on 4,6, or 8 hose streams (1-1/8" tips) running simultaneously. The Fire Protection Handbook from that time says the most efficient maximum flow points are 100gpm from 1-1/2" hose and 250gpm from 2-1/2" hose. The 1918 fire protection handbook states that there should be at least 30psi available from the standpipe at all times. (Chapter 27.62, page 374) Interestingly, it takes 45 psi to get 250gpm from a 1-1/8" tip. Jump forward to the 1962 fire protection handbook and it says there should be 40-50psi available at the topmost outlet (while water is flowing through 50 ft of 2-1/2" hose) and that no standpipe should be accepted having less than 20psi available. Hope this was helpful. Sorry to not have a direct answer to your question. It should be recognized that the above is my opinion as a member of the NFPA Committee on Standpipes, and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects and should therefore not be considered, nor relied upon, as the official position of the AFSA, NFSA, NFPA, nor any of their technical committees.
Sincerely, Cecil Bilbo Academy of Fire Sprinkler Technology at Parkland College Champaign, IL 217.607.0325 www.sprinkleracademy.com [email protected] OUR STUDENTS SAVE LIVES!! > Date: Tue, 10 Jan 2012 06:51:53 -0500 > To: [email protected] > From: [email protected] > Subject: standpipe pressure beginings > > When were standpipes first stipulated to have a minimum pressure? I would > assume that at some point there was no minimum pressure standard (in the days > prior to hydraulic calculations). I am dealing with buildings up to 100 years > old. > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860.535.2080 > www.fpdc.com > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120112/f221b6db/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
