NFPA 13-2016 has the following statements on how to treat water demand between the ceiling sprinkler system and the in-rack system:
17.1.2.9.6 The in-rack sprinkler demand shall not be required to be hydraulically balanced with the ceiling-level sprinkler system.
23.4.5.2 Water demand of...
Does NFPA 13 require pipe hangers and supports that are not UL/FM listed to account for pressure thrust forces and any other forces beyond NFPA 13-2019 17.1.2 for five times the weight of the water-filled pipe plus 250 lb at each point of piping support?
We have a 6" dry standpipe (NFPA 14...
I know NFPA 20 has a specific chapter that governs fire pumps in series (the state building code uses the 2013 edition to be specific at the moment).
Does anyone know if there are any requirements governing multiple fire pumps in parallel? Note that the pumps would be required as part of the...
Can someone suggest available manufacturers that supply seismic movement joints that have a maximum working pressure of 225 psi for 6-inch pipework?
I am looking at Metraflex and their Fireloops are rated at 175 psi working pressure for the 6-inch version. Any suggestions greatly appreciated!
Has anyone had any experience heat tracing / insulating a seismic separation assembly, per NFPA 13-2019 Figure A18.3(a)?
We have a 6-inch fire service line that runs across a building seismic / expansion joint that is currently insulated with 2-inch fiberglass / heat-traced. UL/FM-listed...
Is cement-lined DI pipe allowed under NFPA 14 for aboveground Class-I dry standpipe systems?
I checked NFPA 14-2019 (as well as an earlier edition that is applicable to the state), and could not find anything that prohibits its use.
Reason for asking is that the AHJ is stating that it is not...
Referring to the design / density curve from NFPA 13, although the selection point along each curve (e.g. LH, OH-1, OH-2, EH-1 and EH-2) is at the discretion of the fire protection designer, I have seen most designers select the lowest area to achieve the lowest mass flow rate upon activation...
Are magnetic door holds (which are released and allow door closure prior to clean-agent discharge) an NFPA 2001 code requirement or good practice as part of sealing the room, as with damper and local A/C equipment shutdown / closure? I cannot find a clause that stipulates a requirement in the...
In NFPA 2001-2018, Clause 5.3.6 states that:
"Other than the ventilation systems identified in 5.3.6.2, forced-air ventilating systems, including self-contained air recirculation systems, shall be shut down or closed automatically where their continued operation would adversely affect the...
We have a single floor structure that is protected by a Class-I dry standpipe that runs a partial loop around the periphery edge of the structure, with short (~5 feet) tee-offs to fire hose valves every 150 feet. This ensures that the entire structure has hose coverage. The dry standpipe is fed...
There are a number of studies out there that state black steel pipe with a nitrogen generator (as supervisory) in a dry pipe system provides better corrosion resistance within the pipe, versus galvanized pipe and a typical oilless air compressor.
However, as dry pipe systems are often installed...
Refer below extract from IBC that describes the requirements for a Fire Command Center. I am trying to find out whether this particular room needs to be sprinkled or protected by some other form of fire suppression system. However, nowhere in IBC does it stipulate the requirement for any fire...
Is there any relationship / requirement indicated in NFPA 13 between the hazard classifications and the required sprinkler activation temperature?
There is a clear relationship between the hazard classification (e.g. LH, OH1, OH2, etc.) and sprinkler application density, but does a similar one...
As mentioned in the title of this post, should the dry-pipe main and auxiliary drain piping be included as part of the dry-pipe system volume calculation?
I believe it should be, but would appreciate a second opinion.
Does a dry pipe system need a jockey pump? I am certain not, since there is no wet sprinkler pipe that needs pressure maintenance for small leaks etc. However, would appreciate any thoughts on this. Thanks.
I am currently designing a dry pipe system for a facility (OH Group 2 occupancy) located in NYC.
I am attempting the design this system to the 750 gallon limit (with a QOD) but am finding through hydraulic calculations that there is sufficient available flow (after including the inside and...
