There are two signs referenced in NFPA 14 (2016) and methinks they’re being confused here. There’s a sign at the FDC stating the required pressure prescribed by 6.4.5.2.2 and one for the hydraulic design summary (i.e. the “calc card”) per 6.8. I think the FDC placard should state the required inlet pressure in order to make the minimum residual at the most remote outlets per the standard used as a basis of design (pre-1993), but I would VERIFY THAT WITH SERVING FIRE DEPARTMENT. The hydraulic summary could actually be two cards, the original design (assuming it was calculated in 1986 and not pipe scheduled) and the current performance based on certification testing. Again, consult with the AHJ; Mark’s comment is correct, that you’re essentially taking ownership of the design if you tag it with the performance test data.
The preceding is my opinion only and does not represent an interpretation at any level of the NFPA 14 standard or reflect the opinions of the members of the technical committee. [Steve Signature (3)] From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Tom Duross Sent: Friday, January 4, 2019 6:27 AM To: sprinklerforum@lists.firesprinkler.org Subject: FDC Placard Trying this one more time, original never posted.. Did a 5 year Standpipe test on an older (1986) system with its own Fire Pump. Older ’83 BOCA (MA supplements, 14-1976): 500(1st) + 250 (2nd) plus 250 (for sprinklers). 1000 gpm Fire Pump in Basement. Owner is asking me to provide a new placard for the 2 FDC’s. OK. Question: Even this is an older 65# design system, it delivered almost 100# (to my surprise) from the 2 Standpipe’s FDV’s. 250 + 250 @ 83 from Roof Hydrant and 250@86 from top of other Standpipe. Would you guys create an 83/86# design placard (this would match actual fire pump delivery) or a 65# design placard for the FDC’s? I’ve hardly ever been asked to provide one for an older pre-100# system. I usually end up running hydraulics anyway to work the pump discharge back through the FDC piping to the inlet. I’m inclined to lean towards stating something like “To match Building Fire Pump delivery of blah-blah-blah, a pumper delivery pressure of blah-blah is required at the FDC”. (it won’t have the ‘blah’s in it) I don’t want to incur any liability in scaling back residual pressures in a program versus actual. Tom Duross
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