The reason for the ISO method being more atractive is that ISO allows the "Effective Area" to be calculated utilizing 2hr fire separations for compartmentalization. In simpler words, you are allowed to calculate the fire flow based on the LARGEST effective area bounded by 2hr construction. This also allows 2hr floor assemblies to be utilized as boundaries as well.
In addition, if your structure is two stories or greater, there is an allowance for "protected" vertical openings vs. "unprotected" vertical openings. The fire protection handbook has a very good section on Needed Fire Flow and lays out most of the ISO method requirements and allowances. Ray Vance Chief Engineering Tech. Wayne Automatic Fire Sprinklers, Inc. www.waynefire.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of George Church Sent: Thursday, July 24, 2008 9:32 AM To: [email protected] Subject: RE: Fire Flow Calculation There was an article by Ken Isman from the OFSA (Other Fire Sprinkler Association) in Sprinkler Quarterly recently (April? A group of people standing by a fire truck on cover) which ran thru some of the fire flow calculations, and in it he referenced a previous SQ article from 2003 which had more detail on the subject. He discusses the difference between the IFC and ISO methods of determining fire flows, and I recollect the ISO method was more attractive for reasons I don't recall at this time. If you have access to SQ, this might be exactly what you're looking for. George Church Rowe Sprinkler -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ray Vance Sent: Thursday, July 24, 2008 8:54 AM To: [email protected] Subject: RE: Fire Flow Calculation Ron, Just a few questions to stimulate the ole thought processes this morning ;-) (1) What fire flow calculation method are you required (or allowed) to utilize in the jurisdiction you are referencing? (2) Have you calculated the "effective area" based on the allowed compartmentalization of the method you are using? (Such as 2hr fire separations, 4hr fire separations, etc.) (3) How is the 200k sqft addition separated from the 150k sqft existing building? (4) How is the 50k sqft unsprinklered area separated out of the 150k sqft existing area? (5) What reduction in fire flow does you local authority allow for sprinklers and is there a possibility of an alternate reduction percentage (ie. 50% instead of 75%) based on the way the 50k sqft area is separated out of the 150k sqft area? (6) What was the orginal fire flow requirement for the existing 150k sqft building and how was the unsprinklered 50k sqft addressed at that time? Maybe we can get a better determination of the actual conditions you are dealing with and a more definitive number than "ALL" or "NONE" in the fire flow calculation process with a little more information from which to work. Ray Vance Chief Engineering Tech. Wayne Automatic Fire Sprinklers, Inc. www.waynefire.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Fletcher, Ron Sent: Wednesday, July 23, 2008 4:36 PM To: [email protected] Subject: Fire Flow Calculation Looking for help to determine required fire flow. New addition to hospital is 200k sqft. 150k sqft existing building with 50k sqft of the 150k not sprinklered. Construction type is I-FR. Ron Fletcher Aero Automatic Phoenix, AZ _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) ----------------------------------------------------------------------- Wayne Automatic Fire Sprinklers, Inc. 2006 Inductee into 'The Players Hall of Fame' at The Great Games of Business http://www.greatgame.com Wayne Automatic Fire Spinklers, Inc. 'Best Places to Work' http://tinyurl.com/ov335 by Orlando Business Journal _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) ----------------------------------------------------------------------- Wayne Automatic Fire Sprinklers, Inc. 2006 Inductee into 'The Players Hall of Fame' at The Great Games of Business http://www.greatgame.com Wayne Automatic Fire Spinklers, Inc. 'Best Places to Work' http://tinyurl.com/ov335 by Orlando Business Journal _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
