13 R has an exception for installing heads in closets only accessible from outside an apartment [such as from a balcony] with no unprotected openings into the apt. [6.9.7 of nfpa 13r 2007] However, 6.9.4 says if it has heating equipment in it, it gets sprinklered. Do you normally put a...
Its a 4 story building with V-B construction NFPA 13 system. Enclosed stair shafts are 2 hour rated but entire stair inside is wood. There are mid-landings that are 48" wide. Since the code says "sprinkle BENEATH all combustible stairs" I am thinking that every landing including the mid...
Nfpa 13 requires sprinklers beneath all stairs of combustible construction. To comply with this, I believe we need sprinklers at each floor landing, not just top and bottom as in non-combustible stairwells. Would this be correct or would someone say the mid-landings need sprinklers also. Thanks...
If you have a multi story apt building with one combined riser and zoned per floor, does NFPA 25 require internal pipe inspection every five years for the one whole system, or is it "every other system" meaning each alternate floor zone?
Nfpa 20 is clear on the need for an eccentric reducer before the firepump when it is splitcase horizontal. What I am confused about is why is there the same need for ecentric reducer on a vertical pump? Since the pump rotates 90 degrees different, why is there still required to have an eccentric...
Does anyone out there have access to the Tyco program for delivery time that would be willing to do the calculations [for a fee] for an attic system. Its calced in Hydracalc and we could email the dwg. Thanks for any help you can give. This needs to be a formal program listed by a nationally...
Does anyone have any experience or advice for bidding a large project with all "isolation hangers". Are there approved hangers for sprinkler pipe how would you facter in the added cost?
If there is a ceiling that is 8" below the solid wood joists and the steel that supports the ceiling is 2" thick, would you consider this exempt from needing sprinklers above and below? It may be a little picky but the space to fit the pipe and upright cc2 head is really limited if not...
Can anyone point me in the right direction on where it would show the way to calc a system with a pressure tank. After I determine the ratio of pressure and water, where does it tell you what to use for the residual pressure and flow? Am I missing something in 13?
Does nfpa 13 require a special calc using Darcy-Weisbach formula for antifreeze systems or is it just recommended? In a small attic system less than 40 gallons would the Hazen-Williams calc [we use hydracalc] be close enough?
If you have a parking garage with a manual standpipe system [just fdc supplied] with five risers, is there a purpose in putting riser control valves at the bottom of each? I understand the need to isolate a riser in a wet system, but does NFPA 14 require them if it is just manual with no water...
Nfpa requires a 30 percent increase for slopes more than 2/12. It does not seem to address a curved roof as found in a large quanset type structure. First, there is no way to determine the slope if the roof is curved, right? Second, would the increase apply to curved roofs since it is the same...
If you have a decorative "floating" ceiling below the main ceiling that is open around the edges, you need heads in the lower ceiling since it is more than 4 foot wide. However, when do you need to have heads above it also? If the lower ceiling is only say 12" below the main ceiling [all...
Does anyone know the best way to get an inexpensive [or free] program that would estimate the water delivery time for a dry system. We have hydratec calc that may be used somehow to input the info. Thanks for any suggestion.
If a low rise building can be allowed to have a manual standpipe, i.e. calc it with supply by fdc only, but sprinkler system needs a firepump, could you size the pump just for sprinkler demand? This would be a difference between a 200 gpm pump for sprinkler or 1000 gpm pump for 3 standpipes. In...
Here is another sketch which may explain the the reasoning of why I think it is still 168 sq ft when you cut an area in half and keep the same head location. Why would one be ok but the other...
I have always gone by the fire marshals advice that if the higher area is enclosed by full height walls, sprinkle it from the floor zone below. If there are balconies with railings and is open the floor below, it can be sprinkled from the upper system. It would be obvious to first responders...
The only reason for the return bend would be to keep sediment out of drop, so if its attached to the top of tee or 90, its still going to have the same result as hard piping and should be in compliance [for my 2 cents].
