I'm sure they might sometimes try to put two hoses on a single clapper body, but the main asset of that configuration is the option of using one or the other inlet in case the attachment angle is better, or more convenient or one of the inlets is obstructed, broken, etc. Let's all keep in mind that the "requirement" that an inlet be provided for every 250 GPM of demand doesn't exist in the standards - it's just an old "rump rule". A helluva lot more water than 250 GPM can be pumped into a 2 1/2" outlet, that's for sure; the newer mains here in SoCal often flow 1,500 GPM OUT of a single 2 1/2" hydrant port.
With higher demand sprinkler systems and for multiple standpipes, it's certainly a good practice to provide 4-way and even 6=way inlet manifolds, where multiple hoses and much higher flow rates would definitely be of value. But if the FD is trying to pump more than 500 GPM into a light or ordinary hazard system with a single-clapper 2-way FDC, chances are that the fire has overpowered the system and they should be pulling back to watch the water circus. Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Law, Kevin W Sent: Wednesday, April 07, 2010 11:09 AM To: [email protected] Subject: RE: FDC Oh thanks, George.......I suppose you wouldn't have to have a second check in the system upstream but it would make it difficult to add a second hose to the FDC if you have already attached a single and found it wasn't enough.....I can't talk for the fire fighters, do they normally put two hoses on a double FDC at the start? Help anyone??????? Anybody Kevin Law, PE Bechtel National, Inc. Waste Treatment Project Fire Protection Engineering Work (509) 371-3280 Cell (509) 531-5715 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of George Church Sent: Wednesday, April 07, 2010 11:09 AM To: [email protected] Subject: RE: FDC Perfect example of contractor vrs PE :) -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Law, Kevin W Sent: Wednesday, April 07, 2010 2:00 PM To: [email protected] Subject: RE: FDC Poor design? Who made it? Kevin Law, PE Bechtel National, Inc. Waste Treatment Project Fire Protection Engineering Work (509) 371-3280 Cell (509) 531-5715 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Doug Hicks Sent: Friday, April 02, 2010 7:24 AM To: sprinkler board Subject: FDC We have a 90° Siamese double clapper FDC rising vertically from the ground. The double clapper is hinged at the top. Is there a reason for the double clapper instead of the more common single swinging clapper? Douglas Hicks General Fire Equipment Co of Eastern Oregon, Inc _______________________________________________ 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) _______________________________________________ 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) __________ Information from ESET NOD32 Antivirus, version of virus signature database 4946 (20100315) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 4946 (20100315) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.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)
