I am reviewing a set of fire suppression drawings from another engineer that is working as a sub to the sprinkler contractor. We created an outline of the fire suppression requirements (a performance spec) and then the contractor hired another engineer to finish the design.
The building is a 6-story wood frame residential project.
There are two exit stairs each with a Class I Standpipe and 2.5-inch fire hose connection (FHC).
The building is an 'L' shape and the total travel distance from one FHC to the other is approximately 300-ft (91m).
There is a 2-hour fire-resistance-rated wall part way along the corridor (124-ft from one FHC, 174-ft from the other).
The contractor's engineer is calling for an additional third standpipe next to the 2-hour rated wall - is this required or not?
I'm not sure how to interpret Sections 188.8.131.52 and 184.108.40.206.1 of NFPA-14. The project is in BC, Canada; and we're using NFPA-14 (2013 Edition). I have attached a markup of a typical floor plan.
Thanks in advance!
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10/17/2022 08:04:12 am
Based on the picture alone, first thought is that the center stair (likely an exit stair) is missing a required hose valve per Section 7.3.2 (1). With that location having a valve, you might be able to omit the third HVC on the floor.
10/17/2022 08:10:27 am
The BC building code will have requirements for placement and coverage please see below.
10/17/2022 08:13:20 am
The drawimg is not marked correctly. The 124' and the 174' needs to identify the distance that it is measuring. In this case it is the top/bottom dimension and then the left/right dimension.
10/17/2022 08:45:46 am
Just updated the image, refresh to see it. Stairs are now marked correctly, thank you Glenn!
10/17/2022 08:13:28 am
I agree with Dan. Looks like the center stair is missing hose valves. Is that a stairwell on the end?
10/17/2022 08:45:22 am
Good questions - just updated the sketch with labels and marked "Stair 1" so it shows more clearly. Yes, there are three stairs. Thanks Jesse.
10/17/2022 08:23:35 am
Without looking at coverage from an operational firefighting point of view FHC should always be placed close as possible to stairs. The stairs are the entering or access point for firefighters and rescue personnel. On multi storey buildings you never enter fire floor without charged water line and your escape is always planed back to stair. By instinct and training firefighters will seek the FHC at stairs.
10/17/2022 08:58:38 am
10/17/2022 01:25:38 pm
See Corey's comments. Section 220.127.116.11 (2) of the BC code. Hose connections are not required within a floor area. I have done residential buildings in BC recently and got push back from the client when we showed hose valves outside of the stairs.
10/18/2022 07:11:05 am
EVER TRIED TO CARRY MORE THAN 100' OF FIRE HOSE ?
James Art, Ca FPE
10/19/2022 11:18:34 am
Looks like that 3rd stair is missing a standpipe.
10/20/2022 06:53:35 pm
I'm not sure how this particular Canadian code works, but typically here in the states, IBC requires either no standpipes, Class I, or Class III standpipes, depending on the height of the building. From there NFPA 14 tells you that standpipes must be located in every required exit stairwell (not convenience or strictly ornamental stairwells). From what I understand, the travel distance in IBC matches hose lay now in most cases. Which typically means no need for additional hose stations or standpipes. Code typically tells you when something is required, standards tell you how to do it and where to place them.
10/25/2022 05:08:03 pm
I would think a third standpipe required in Stair 2. Depending on your building code in use, if the building is fully sprinklered the travel distance is extended from 100' to 200'.
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