Thanks for comments But this is my calculation: Occupancy: 6-story light hazard building, with required density of 0.1 gpm/ft2 and area of sprinkler operation 200ft2 and a pump is 300Gpm/70psi located in basement as well as water tank. Required flow rate = 0.1 gpm/ft2 x 200 ft2 = 20 Gpm - Scenario1: I use different K factors for each floor to limit the flow rate around my required, I use K=2.8 for 1st floor, K=4.2 for 2nd floor .... K=8 for 6th floor. In this way the flow rate will approximately vary from 21.7Gpm to 29.7Gpm. I calculated 7 active QR sprinklers, so the required flow rate for sprinklers is 7 x 29.7 = 208Gpm + 100Gmp hose stream total required flow rate = 308Gpm. - Scenario2: If I use the same sprinklers with K=8, then at the 1st floor the pressure is 60psi. I calculated 7 active QR sprinklers, so the required flow rate for sprinklers is 7 x 62 = 434Gpm + 100Gmp hose stream total required flow rate = 534Gpm.
- Scenario3: If I use the same sprinklers with K=8, but I reduce the pipe sizes of mains on the lower floors in order to increase pressure drop through the piping, but is it really possible to drop 30 psi with reducing the pipe sizes? Won't make other problems such as high velocity, high temperature, etc? Which Scenario do you like the best to reduce the size of pump and water tank? What is the problem with Scenario 1? Regards, Reza www.saeian.ir ________________________________ From: Ron Greenman <[email protected]> To: [email protected] Sent: Tuesday, August 13, 2013 11:14 PM Subject: Re: Different K factor in each floor practical? remember that pressure is your friend. Not having enough pressure is usually the problem. On Tue, Aug 13, 2013 at 1:09 PM, Eric Tysinger <[email protected]> wrote: > Also to add, given a 6-story building with a basement you should be > looking at about 70ft of elevation difference between the basement and the > roof. If a pressure reducing valve was used and you limited the pressure to > 165psi at the basement level you would should still have at least 125-135 > psi available at the roof. > > Eric Tysinger CET > NICET III - 108988 > Project Manager - Fort Myers Branch > Wayne Automatic Fire Sprinklers, Inc. > 4683 Laredo Ave. > Fort Myers, Florida 33905 > p: (239)433-3030 x1240 f: (239)433-3263 > C: (239)633-9703 > > For Fire Alarm Service and Monitoring questions contact us at: > [email protected] > > "Ask us how we can eliminate your Fire Alarm phone line bills" > "Ask us about CCTV, Access Control and Security" > > Thank you, and have a great day ! > > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Eric Tysinger > Sent: Tuesday, August 13, 2013 4:06 PM > To: [email protected] > Subject: RE: Different K factor in each floor practical? > > Assuming that you do not exceed the psi rating of the components > (typically 175psi) on any given floor, why worry about the pressure at each > floor? If you do exceed 175psi, the use of a pressure reducing valve at the > ground level would be a better choice for controlling your pressures. > Changing the k-factors would only limit your starting head pressures, the > pressure available on each floor would still remain the same. > > Eric Tysinger CET > NICET III - 108988 > Project Manager - Fort Myers Branch > Wayne Automatic Fire Sprinklers, Inc. > 4683 Laredo Ave. > Fort Myers, Florida 33905 > p: (239)433-3030 x1240 f: (239)433-3263 > C: (239)633-9703 > > For Fire Alarm Service and Monitoring questions contact us at: > [email protected] > > "Ask us how we can eliminate your Fire Alarm phone line bills" > "Ask us about CCTV, Access Control and Security" > > Thank you, and have a great day ! > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Reza Esmaeili > Sent: Tuesday, August 13, 2013 3:34 PM > To: [email protected] > Subject: Different K factor in each floor practical? > > Hi! > For a 6 floor business office building considered as light hazard > occupancy, and the minimum sprinkler discharge density 0.1 gpm/ft2, that > the fire pump is located in the basement, in order to adjust flow rate of > sprinklers not to be very high at each floor, what strategy is usually > considered? Is it common to use different K factor sprinklers in each > floor? like the below: > Lets say the pump is 30Gpm at 70Psi and consider the below: > - Pressure at 1st floor= 60 psi ---- I choose a sprinkler with K=2.8 to > have Q=21.7Gpm > - Pressure at 2nd floor= 50 psi ---- I choose a sprinkler with K=4.2 to > have Q=29.7Gpm > - Pressure at 3rd floor= 40 psi ---- I choose a sprinkler with K=4.2 to > have Q=26.7Gpm > - Pressure at 4th floor= 30 psi ---- I choose a sprinkler with K=4.2 to > have Q=23Gpm > - Pressure at 5th floor= 20 psi ---- I choose a sprinkler with K=5.6 to > have Q=25Gpm > - Pressure at 6th floor= 10 psi ---- I choose a sprinkler with K=8 to have > Q=25.3Gpm > > The above numbers are theoretical, I just would like to know if it is > common to change the K factor at each floor to adjust flow rate? > Or may be a pressure regulated valve is better to use at each floor > instead of different K factor? > > Ps. I have considered to use quick response sprinklers. > > Thanks! > Reza > www.sarian.ir > > > > > > > > > ________________________________ > From: "[email protected]" <[email protected]> > To: [email protected] > Sent: Tuesday, August 13, 2013 5:24 AM > Subject: Re: Sleep on it! > > > Do they stock those foam "dorm" quality mattresses? How many and how > stored? > > I think a lot of places don't. If they do, they ignite easy, and burn fast > and hot. Burn a single one on edge. The fire is essentially over in a > minute, with just a small residual flame from remnant puddle. > > Temporarily solidified petrochemicals. > > bv > > ----- Original Message ----- > From: "Charles Thurston" <[email protected]> > To: "Vince Sabolik" <[email protected]> > Sent: Monday, August 12, 2013 3:07:02 PM > Subject: Re: Sleep on it! > > Hello Vince, > > Just did one a few months back in a strip center. I will try to remember > when I get to the office tomorrow and see what it was. > > Monday, August 12, 2013, 5:58:24 PM, you wrote: > > > Hey forum -- > > > Has anyone done a design for a small retail mattress store? > > > Would Class III, Group A really apply? Not really storage... > > > Thanks! > > > Vince Sabolik, West Tech Fire Protection, Inc. > > 11351 Pearl Road / Strongsville, Ohio 44136 440 > > 238-4800 Fax 440 238-4876 > > ____________________________________________________________________ > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > > -- > Best regards, > Charles mailto:[email protected] > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
