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Thanks SprinklerDesigner2. This is a retrofit project due to occupancy class change and we have no fire pump with around 60 psi at the riser base. Looking to protect Class A Plastic Unexpanded in Cartons up to 20 feet. ESFRs would require at least K-14.0 with 50 psi end pressure. Don't think...

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...

Yes both answers addresses my concerns. I was looking for some anecdotal advice on whether parallel pumps were possible. It seems like it is permitted per NFPA.

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!

Thanks stookey and matt for the replies!

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...

Thanks stookey. The dry standpipe is for a underground transit application, which is equivalent to a marine environment in terms of the corrosion. We wanted to propose a corrosion resistant solution without breaking the bank (i.e. going down the stainless route)

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...

Thanks for clarifying Travis.

Thanks for the replies and sorry for not responding back sooner. Is there somewhere in NFPA-13 (or a related NFPA code) that stipulates a requirement to perform engineering analysis in determining the sprinkler design parameters (incl. operational area and density), if a specific fire size (in...

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...

@stookeyfp - thank you for pointing me in the right direction.

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...

Thanks for the replies guys. The local AHJ has a requirement that the standpipe be filled in no more than 10 minutes. Based on the volume of the system, anything from a fire apparatus greater than 500 GPM would satisfy this requirement, so any FDC can be used to fill. Glad there is no...

Thanks cdafd!

Local AHJ requires street level FDCs every 300 feet of a building frontage or part thereof. Same reasoning for the quantity of FHVS, based on the 150 ft FHV-to-FHV spacing requirement. I am thinking the same that an isolation valve isn’t required. Putting one on the 200 foot side would...

See attached sketch of the system for reference. We have around 10 nos. 2-1/2 inch FHVs.https://files.engineering.com/getfile.aspx?folder=3031563b-026d-4c57-a831-06587bdf1a9e&file=file-10.jpeg