I did a couple of them about 15 years ago. As I remember (always suspect) the criteria was .16/1500 with 250 hose. Essentially all you need to do to refresh the solution is drain the system and refill. With MIC now running rampant, this may be an invitation to a different problem though. Galvanized is a no no with most AFFF solutions.
B K -----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)
