Roland is correct. NFPA does not state a 30% increase requirement. NFPA 13-11.2.3.2.5 requires a 30% increase for hydraulically calculated systems. However, 13-11.2.2.3 clearly states that "Additions or modifications to existing pipe schedule systems sized according to the pipe schedules"..shall be permitted. So, provided that the system piping complied with Chapter 22,this system could be converted from wet to dry using the pipe schedule system. It could be considered a modification not requiring hydraulic calcs with the increase.
Forest Wilson Cherokee Fire -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John O'Connor Sent: Wednesday, August 11, 2010 12:34 PM To: [email protected]; [email protected] Subject: RE: pipe schedule and storage And if the system is converted to dry can the existing pipe schedule afford the 30% area increase while flowing water thru two pieces of 1" at the end of all lines. I doubt it. John O'Connor -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Sent: Wednesday, August 11, 2010 11:26 AM To: [email protected] Subject: RE: pipe schedule and storage And hopefully it was installed long enough ago that sloping the pipe to drain was required on wet systems too -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Wednesday, August 11, 2010 11:21 AM To: [email protected] Subject: RE: pipe schedule and storage Typically if you're not touching the old system it can stay in place as-is. BUT if they want to modify it and try to change from wet to dry (good luck with that) then it's game over and it has to meet current codes. The whole idea of grandfathering in non-compliant systems is a misnomer. Plus the big thing, how can you prove the system will function when changing from wet to dry without calculating it? Besides, when did the owner become a code and fire protection expert? You just gotta love it. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: Wednesday, August 11, 2010 12:14 PM To: [email protected] Subject: pipe schedule and storage I think I have this one, but could use a little more ammo. I walked through an old mill building this morning with an old OH pipe schedule system. (They want to convert from wet to dry). In the building, they have some 8 ft storage of a Group A plastics in cardboard cartons and well as 2 piles of idle pallets to 8 ft. The owner is claiming that the pipe schedule is grandfathered and the system does not need to meet the hydraulic criteria. I disagree and am basing most of my argument on the water supply requirements in 11.2.2 (NFPA 13, 2002 edition). Any other thoughts? 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 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) No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3064 - Release Date: 08/11/10 01:34:00 _______________________________________________ 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)
