FPE Corner Continued from page 22
improved by reducing the total num- ber of words. I think we must make the effort, as I do not have a back pocket big enough to carry a two-vol- ume version of NFPA 13. Update on antifreeze: NFPA has
issued four new Tentative Interim Amendments (TIAs) on the use of antifreeze in sprinkler systems. TIA
10-2 log 1015 pertains to NFPA 13, TAI 10-2 Log 1012 pertains to NFPA 13D, TIA 10-2 Log 1013 pertains to NFPA 13R, and TIA 11-3 Log 1014 pertains to NFPA 25. The effective date of these TIAs was March 21, 2011. The 10-2 TIAs replace the August 2010 TIAs 10-1, which had imposed
a moratorium on the use of antifreeze in dwelling units. These new 10-2 TIAs apply to all new sprinkler sys- tems, not just those in dwelling units. Only factory premixed solutions of antifreeze may be used, and antifreeze solutions are limited to glycerin not exceeding 48% by vol- ume and propylene glycol not exceeding 38% by volume TIA 11-1 for NFPA 25 contains
similar requirements for existing sprinkler
systems. Existing
antifreeze can remain in place if it can be identified as either glycerin or propylene glycol, in concentrations that do not exceed 50% by volume for glycerin and 40% by volume for propylene glycol and if it does not require modification. Testing of the antifreeze at up to four locations is required as follows: the top of the system, the most remote point of the system (if not at the top), the bottom of the system and at the water supply connection (if not at the bottom of the system). Use the following links to get all
the details of these TIAs: NFPA 13:
www.nfpa.org/aboutthe- codes/
AboutTheCodes.asp?DocNum =13
NFPA 13R:
www.nfpa.org/about- thecodes/
AboutTheCodes.asp?DocN um=13R NFPA 13D:
www.nfpa.org/about- thecodes/
AboutTheCodes.asp?DocN um=13D NFPA 25:
www.nfpa.org/aboutthe- codes/
AboutTheCodes.asp?DocNum =25. n
istered fire protection engineer and mechanical engineer with bachelor’s and master’s degrees from the University of Maryland Department of Fire Protection Engineering. He is past president and a Fellow of the Society of Fire Protection Engineers. He is president of S. S. Dannaway Associates, Inc., a 15-person fire pro- tection engineering firm with offices in Honolulu and Guam. He can be reached via email at
SDannaway@ssdafire.com.
Samuel S. Dannaway, PE, is a reg- Circle 15 on Reader Reply Form on page 57 Page 24/Plumbing Engineer
The views and opinions expressed in this column are those of the author and do not reflect those of Plumbing Engineer nor its publisher, TMB Publishing.
April 2011
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