The actual sprinkler operation time is a function of the fire size
and growth because the heat transfer to the element is related to the
temperature and velocity of gasses passing the link/bulb, plus other
factors. I use a program to calculate the difference in time, there
are several available that will work. FDS if you use it, otherwise
if you go to the appendix in NFPA 72 there are manual calculation
methods shown. The problem you will have is getting the actual
response time from the manufacturer, otherwise you have to use the
classification numbers.
I also have a circulating hot air test oven that I use to test the
actual response time of a particular sprinkler. It is similar to the
UL plunge test .
Michael
At 09:06 AM 5/14/2007, you wrote:
We have a customer, a VA Hospital, that is trying to justify changing from
Standard response to quick response sprinklers. We have discussed the RTI
and other factors that make the QR's respond faster, but he is asking if we
know of any time differences that are verifiable. What he needs is some
idea that QR's respond in X seconds and Standard response respond in Y
seconds to show the difference. I have looked in the sprinkler handbooks
( 1999 to 2007) and the Fire Protection Handbook, but only find references
to RTI, no actual times. The FM standard lists 1:15 as the time for QR, but
I could not find standard response.
Any help is appreciated.
Joseph C. Stough CET, CFPS
Tilley Fire Equipment Co.
Tel. 215-345-8066 X22
Fax: 215-345-9357
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Michael M. Fitz, P.E., C.F.I.
MDE Inc.
700 South Industrial Way
Seattle, WA 98108
Main 206-622-2007
Direct 206-957-2140
Fax 206-622-2248
Home Office 360-427-2751
Cell 206-321-1804
www.mde.com
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