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Hello all, I have a question about designing a full NFPA 13 Hydraulically calculated system using the density / area curves from figure 11.2.3.1.1 of the 2007 edition. My question is when you have a large building (say 7,000 sq.ft.) with an Ordinary 2 occupancy classification, is it acceptable...

I'm not sure you will be able to pin this violation in NFPA 13; but it is a building code violation to alter the ceiling tiles with out authorization from the building inspector's office. I would suggest informing the Building Department of this situation and they can require the building owner...

Are you picking up on the 6” theme? 8.14.1.2.3 Concealed spaces formed by studs or joists with less than 6 in. (152 mm) between the inside or near edges of the studs or joists shall not require sprinkler protection. (See Figure 8.6.4.1.5.1.) 8.14.1.2.4 Concealed spaces formed by bar joists...

I would speak to your local Building Department about how they would like you to proceed. They may let you do a build out as they are occupied and you know who the tenant will be. Usualy as long as there is full detection within the spaces.

If I understand your problem right, it’s that the space was overfilled with insulation. If that is the case, I wouldn’t be too alarmed by it, it sounds like the Arc. tried to spec. a 6” gap to use the exception for concealed spaces less than 6” not to be protected by sprinkler coverage. A 4” air...

NJ1, There is no NFPA standard for the testing of the detection devices. It would be done as per each individual device's manufacturer's requirements. NFPA 72 only lays out the time line that they should be tested, not HOW to test them; there are too many types of devices on the market.

In response to NJ1's original question; when an inspection is preformed to comply with the periodic inspection requirements of NFPA 72’s fire alarm systems it is to insure that the devices that were installed are in working condition on the date tested. That’s all a test report should state. If...

I think what you are looking for is stated in section 8.4.5.3 of the 2007 NFPA. It requires fast-responce type heads in residential compartments.

The Building Code should require any penatrations throught the fire rated room to be protected or sealed with a rated assembly. There are products on the market that are made just for such things like pipes where it is hard to seal around them. The company "Hilti" makes a fire rated assembly...

Thanks for all the help. You guy's are great.

Just wondering, is it exceptable to use a density of .05 gpm to design for a NFPA 13R Light Hazard only? I am reviewing a set of plans and am not used to seeing that low of a density. Any comments would be helpful. Thanks.

If the ceiling is open around the edges, then you are not creating a non-combustable concealed space but a obstruction insted. Therefore the upper head may not be left out.

In reading the first post I am wondering why the question is coming up, if it is being looked at during a required NFPA 25 inspection you should only be verifing that the system that was installed and approved works and not to see if it was installed incorrectly for coverage. Becareful siteing...

How long should you flow water for during a forward flow test on a NFPA 13 system after you have acheved your desired gpm rate?

I did'nt think so, I thought I might be missing something.

I belive a Raw water source would be if the system drew it water from a retaintion pond or lake, where the water source has been untreated.

Is there a requirement for a secondary power supply for a 13D system that receives it water source for a well?

Question, Will the well pump that feed a 13D system require emergency backup power in the event of a power failure?

interesting topic, I have seen a few projects where a full basement was add to a structure. Lifting the building and excavating the full basement should not be a hard project. My advised is to pour new full height walls to existing sill plates. Problems I have incountered are installing propper...