Ron,
I would be interested to see where the unnamed firm got their data. I
have recently done design for some prisons in TX. The construction is
concrete and the combustible loading in the dorm and common areas is
minimal (I would think mostly bedding or furniture upholstery). The
separation between units is concrete block or concrete walls. I would
also think that the most prevalent ignition source would be smoking
as most of the other potential sources would be isolated from the
population. Given those circumstances, I would think the QR reduction
would be appropriate.
Also, the quote said "Due to the higher than normal potential for
fire.....". That deals with frequency and not severity. The QR
deduction assumes that by getting water to a fire earlier, the fire
will be knocked down quicker, lessening the severity. It's apples and oranges.
At 06:02 PM 2/25/2009, you wrote:
I would like the take from the PE's on forum on how to deal with a plan
review comment from an unnamed engineering firm (RJA).
"Due to the higher than normal potential for a fire in the occupant
sleeping and common areas, the reduction in fire are (remote area) for
quick response sprinkler in accordance with NFPA #13 Figure 11.2.3.2.3.1
is not a good engineering practice. Please revise the hydraulic
calculation to account for at least the minimum 1500 square foot design
area as specified by NFPA #13."
The hazard is a dormitory at a minimum security prison.
Ron Fletcher
Aero Automatic Sprinkler
Phoenix, AZ
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
www.fpdc.com
860.535.2080
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