Check with your foam supplier on the life of the foam. Not all will last 3 years and life span can depend on the water quality too.
Again check with the supplier on the galvanized. Some of the foams react with Galvanized at certain concentration levels. Usually it's not a problem for foam-water systems as the foam isn't in the pipe for a long duration of time. Also don't forget to check about containment. In some jurisdictions this type of discharge has to be contained and removed as hazardous waste. What are you trying to protect? Craig L. Prahl, CET Fire Protection Group 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.lg.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - FPDC Sent: Monday, February 11, 2008 4:40 PM To: sprinklerforum@firesprinkler.org Subject: pre-primed foam system. I am designing a foam system to be fed from a limited volume public water supply. NFPA 16 mentions a pre-primed foam system with significant decreases in demand. I spoke to someone who knows foam and he said that the system is filled with the foam-water mixture instead of just water (and the foam mixed in at the riser). The biggest problem being that the mixture breaks down over time, so it ends up as pretty much dirty water. My questions are this: Has anyone worked with this type of system before? I was thinking recommending a three year pre-priming schedule, does this make sense? If the pipe is going to contain a mixture full-time, should it be galvanized? The difference in using could be the difference between a pump and tank for a 12,000 sqft warehouse. Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
