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Thanks Travis... Agreed. Both IFC 2018 and NFPA 13 2019 appendix demonstrates this. B105.3 Water supply for buildings equipped with an automatic sprinkler system. For buildings equipped with an approved automatic sprinkler system, the water supply shall be capable of providing the greater of...

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...

We are provided various flows with available pressure from the water authority. The absolute maximum pressure possible is the pressure available from the water authority with no water flowing in their system. This is to be used for fire pump design. The water authority also provides a...

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...

Thank you for the guidance, because of the stored chemicals in the stand alone pool building, AHJ has required fire sprinkler protection.

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...

Thanks CDA.... I keep coming back to this one myself only to look for another direction because they are talking about floor coverage. The shadow effect, in my opinion, seems to be the strongest defense, but as Travis said, the exact letter of the standard indicates a head is required. Thank...

I like Stookey's optimism and common sense. We need some more of that in our jurisdiction. CDA... This is the code that concerns me most. I don't know how to bypass it. Per Figure 6.4.6.3.6.3 we are not in compliance. 6.4.6.3.3.3 is a newer code regarding architectural features not exceeding...

Thank you for the comments. I agree that we are getting floor coverage based on the angle shown. Ceiling coverage and high wall area near the ceiling does not have coverage. Before I consult with the AHJ, I wanted to see if there was an actual code that might help convince my case. Shadow...

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...

Good idea Stookey....Attached is the standpipe showing the 1st and 2nd floor plan on 2 pages. In RED is where I have a hose valve. I can't figure out which hose valves to calculate and how many GPM at the valve. Jurisdiction requires standpipe to be automatic. I am thinking 250@A 250@B...

Travis....Attached is a link to the CAD file. The hose valves don't "stack" like traditional standpipes. The only place this happens is in a stairwell near the fire pump. This stair has the only access to the roof, and the AHJ wanted one on the roof at this location. There are (3) valves at...

And now the rest of the story...I didn't want to make things more confusing, as I didn't think the 2nd floor would matter. AHJ wanted me to calculate the 2nd floor as a separate calculation. Travis, does your opinion change if part of this building has a 2nd story? The middle of the buildings...

CDAFD... Yes this is how I was looking at it. However, there appears to be different guidelines for horizontal standpipes. I wonder what Stookey and Travis think? 3CIO... This is very similar to the thoughts of the AHJ. I want to purchase a 750GPM pump but my gut is telling me I need a 1000GPM.

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...