Fire flow demands for non-sprinklered buildings (your condition if pump didn't start) are higher than the standard hose stream demand for sprinklered buildings. Does he want to just bypass the pump and tie into the FD connection on the system riser or is he planning on just using hose to fight a fire?
Fire Flow is based on sq. footage and building construction Type as defined in the IFC Appendix B or in NFPA 1, Table 18.4.5.1.2. I'd want him to be a bit more specific in what his desire and intentions are. Just curious, for a LH at 0.10/1,500 how did you get to 11,000 gallons? Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, 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: Tuesday, September 22, 2009 4:41 PM To: [email protected] Subject: draft line from suction tank. I am working on a project with a small pump and a buried suction tank. The design was based on sprinkler demand alone since there are no hydrant connections on the system. Now the local AHJ has come back and says he wants a draft line on the tank. The sprinkler system will take approximately 11000 gallons in the 15000 gallon tank. He claims he would only use it if the pump failed to start. Being this is a rural department in an area with no public water supply, I have a bit of a problem believing this. If I had to include a hose demand from a draft line on a tank, would the standard hose demand be practical? The building is all LH and the hose demands would be 100 gpm. Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ 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)
