A future project has a fire flow demand of 4000 GPM for onsite fire hydrants and sprinkler demand of 2000 GPM including hose.
An onsite fire pump will supply demand to both the onsite fire hydrants and the ESFR sprinkler system taking water from a large above ground supply tank.
We believe the...
When determining maximum static suction pressure, we are provided a maximum static by the water authority, based upon elevation at public Point of Connection and 0 GPM flowing through the public network. The provided pressure will not exceed this at POC and very likely will not achieve the...
I have a 780 sq.ft. pool equipment building classified as a U occupancy under the 2013 California Fire Code. Code analysis suggest a design/build fire sprinkler system per NFPA 13. In our opinion a fire sprinkler system in not required. Group U isn't addressed very well as needing protection...
The attached file shows an isometric elevation and code reference for NFPA 13R 2013 6.6.5.1. We have a covered stairwell and covered entry to the apartment unit. This is a 2 story Type V construction multi-family building. The AHJ suggests the roof overhangs the stairs and entryway and needs...
Attached is an apartment in a multi-family project. We have completed 100+ of these 2 story buildings over the years and this problem came up once 6 years ago and was resolved with the AHJ. It has not been a problem until this week when a sr. inspector said we needed to add a sprinkler head...
We are installing a CPVC 13R system it has some straight runs almost 200 feet. Daytime temperatures when we are installing this week range from a high of 65 degrees today to a daytime high of 35 degrees next week. The pipe will eventually be in a controlled environment of 75 degrees. The...
AHJ wants seismic bracing per code, but says there must be bracing within 2 feet of every 90. The old school general rule is... ends, bends and change of direction need seismic bracing. When reading through Chapter 9, I do not see where it says bracing within 2' of changes in direction. Is...
I have 5 vertical fire sprinkler risers on the reduced pressure side of a PRV. FDC, Fire pump and standpipe are on the other side of the PRV. AHJ wants the FDC to split and supply both sides of the PRV. This does not make sense to me, is there a code requirement for this. I will...
I have a single story 100,000 sq. ft. concrete fitness center project. It will have automatic sprinklers and a Class I Standpipe system with 13 2.5" hose valve locations.
According to 7.10.1.1.1 the minimum flow rate should be 500gpm at the most remote location through two 2.5" outlets at one...
Many times we have 3 story buildings. The 3rd floor is the only one calculated, the other two floors are piped typical to the hydraulic design on the 3rd floor. The hydraulic design sign is attached to the 3rd floor control valve. Is a hydraulic sign required on the 1st and 2nd floor control...
Per NFPA-25, After 10 years in service, a sample of dry sprinkler heads are required to be tested by a recognized laboratory acceptable to the AHJ for field service testing. What would be considered a sample. For instance, in a 3 story apartment complex with 30 plus buildings, there may be...
I am 3D Model/BIM coordinating a military OH-2 mechanical room. Upright sprinkler coverage is provided and there is no ceiling. There are multiple 24" (+ insulation) round rigid duct within the room. In a few areas, 2, 3 or 4 ducts run side by side at the same elevation creating an obstruction...
What is the standard design/install for a lead-in on a NFPA 13R sytem. I am very familar with 4" and 6" one piece stainless steel Ames In Building Risers for commercial buildings. I have (2) 13R projects, one has 2" PVC underground pipe stopping 5' from the building. The other show 3" PVC...
