What is the required pressure for a manual Class III standpipe, 65 or 100 psi?

We're working on a 44'-4" high, 5-story, Type V-B construction building that has a 1-story garage and amenities. The upper floor is R-2. 

The local code says I can have Class III standpipe. As I go through NFPA 13 and NFPA 14, it circles back around to 2-1/2" outlets, except with 2-1/2" x 1-1/2" reducers and caps.

It's going to be fully-sprinklered with a combination standpipe in one stairwell, and just one standpipe riser in the other.

Does this sound correct given the project?

Thanks in advance.

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We're working on a one-story school. The AHJ (Fire Marshal) is requiring inside 2 1/2-inch hose valves at the exit locations.

These hose valves are fed directly off the wet sprinkler system main - not fed from a dedicated standpipe main.

1. I'm having trouble finding code regarding feeding hose valves off of the wet system main.

2. I'm trying to determine if the pipe, off the main, to these hose valves, needs a control valve installed.

Appreciate the tips and insight. 

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Hello everyone. Looking to get some feedback on a building under construction.

I have a 3-story condo building with 4 stairwells, protected by an NFPA 13 sprinkler system. The condo building is exterior access via corridor which connects the stairwells and is about 20 units total.

There is a single fire sprinkler riser that enters one of the stairwells at the corner of the building and goes vertical to serve all levels. Overall, fairly typical.

Currently, the building is nearing the end of construction and they’re installing drywall.

However, a new Fire Inspector is asking for “more standpipes”, despite the fact that the building does not have standpipes, nor are standpipes required (3 stories, none below grade, and below height threshold to the top floor, etc.) The reason he is requiring them is because he is saying per NFPA 14, you cannot exceed ~200 feet in between standpipes. However, because the building does not require standpipes in the first place, this code section does not seem to make sense.

Of course, I know the AHJ is allowed to require things above and beyond the code but my big issue is that the building is about 80% complete now, and he asked for this on a typical inspection. The design criteria, FP shop drawings, civil plan, etc. were all approved by other inspectors/ AHJ / Reviewers, and has been for a couple of years.

I noticed he seems to be intermixing the word “Standpipe” and “Fire Riser” frequently which makes conversations more difficult. Just looking for some other opinions on this issue and I appreciate any input at all.

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Regarding: IFC 905.4 Location of Class I standpipe hose connections.

Class I standpipe hose connections shall be provided in all of the following locations: 1.in every required interior exit stairway, a hose connection shall be provided for each story above and below grade plane,. Hose connections shall be located at the main floor landing unless otherwise approved by the fire code official.

Does this mean a standpipe connection is not needed at the ground floor?

I've brought this up to numerous design/build sprinkler subs and they all say a connection is required at the ground floor.

Thanks in advance.

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I have a standpipe demand of 750gpm. I am providing a fire pump for the system demand.

Should I be selecting a 750 gpm pump or a 1000 gpm pump, based on adding a safety factor (or other reasoning)?

My sprinkler demand is less than 750 gpm so I would only need to provide the 750 gpm for the standpipes. Thanks in advance.

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We have a 3-family building with parking garage and three floors over parking for a total of four floors.

According to the IBC, a standpipe is required; my question is - is the standpipe required in all stairs?

We have two stars which are less than 30-feet between the stairs. 

Thanks in advance.

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A thread to discuss more on Post-Indicator Valve requirements from our blog hits series.

Original 2019 article link: www.meyerfire.com/blog/post-indicator-valve-required-for-my-project

Are you allowed to have a valve off the standpipe feeding a hose valve that is not in the stairwell?

Working in a high rise building with two stairwells. It is dual fed with combination riser standpipes.

On the tenant space there is a hose valve and they want a butterfly on the feed for the hose valve, always thought that was not allowed but couldn’t find it.

Thanks in advance.

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Occasionally, additional hose valve connections are required due to the failure of meeting a 150-ft / 200-ft travel distance to a hose connection.

Can you put a hose valve connection on a sprinkler system without a standpipe?

How do you reflect this in a hydraulic calculation?

A most-remote standpipe would require 500 gpm in a standpipe calculation. Thanks in advance.

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​I am currently evaluating a 7-story building that is being partially renovated and has an existing standpipe system (2 standpipes), but no sprinklers. My scope was to add sprinklers to the renovated areas, creating a partially sprinklered building.

The lack of pressure is leading the AHJ to require a fire pump due the 100 psi required for the standpipe system.

While the standpipe requires the fire pump, hydrant flow tests indicate that there may be sufficient pressure to supply a sprinkler system.

My question is two-fold. Is there really such a thing as a non-combined sprinkler/standpipe system where they are both required?

They both get their water supply from the same source.

Also, can I evaluate supplying the sprinkler system through a separate riser that tees off before the fire pump, while the fire pump supplies only the standpipe, significantly reducing the size of the pump?

The pump would be sized for 750 gpm total, 500 gpm @ 100 psi to the remote hose connections, and 250 gpm to the second standpipe.

What would that sprinkler calculation look like?

Would the sprinkler calculation remove the hose stream allowance and replace it with the 750 gpm to consider the flow to the pump/standpipes?

The flow potential is there based on the hydrant flow test just not the pressure for the standpipes (and it's close for sprinklers). I'm just wondering if I can give the client and rest of the design team options.

Thanks in advance.

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Is it a requirement to have a 42-inch handrail on the edge of the building, due to the standpipe hose connections and this needing to be accessible for the fire department use?

​If it's required, it seems that handrails could apply under IBC 2018 Section 1015.6.

Thanks in advance.

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I'd appreciate some advice.

What's the best way to regulate pressures on a combined sprinkler (OH2) and Class 3 standpipe system?

Obviously the pressures required vary between sprinklers, 2-1/2" standpipe outlets and 1-1/2" hose rack connections.

Pressure regulating valves are expensive to put in on all connections, but I was thinking about using pressure regulating valves for the 2-1/2" standpipe outlets.

I think it's great that we can all share our combined experience on this great website - thanks in advance!

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I'm working with a city inspector who is adamant that we add a second non-rising stem valve (NRS) in the fire sprinkler service main just before the building. The first valve being in the street at the live-tap location with the roadway box.

Is a valve required on the service main before the building?

The requested location would place the valve under the sidewalk, accessible by T-handle wrench only, prohibiting reliable supervision of any kind.

I can't seem to find any language in NFPA 24 that I can use to argue against the second unsupervised valve. I don't see any value in the position the inspector has taken and requested a copy of the city ordinance requiring the additional valve.

Installing the second valve wouldn't be a huge deal but certainly seems like an unnecessary opportunity for an unsupervised valve to get closed or fail. I would like to hear what others in this community think and if anyone has something to offer.

Thanks in advance.

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Has anyone designed a dry manual standpipe for a pier or dock standpipe system in the past?

My question is in regards to materials used for the pipe.

With the tides rising and falling my client is struggling to find an approved material that will allow for enough flexibility.

I walked an adjacent marina to our project and it looked like they used 4" heavy-duty rubber tubing to run out the standpipe lines and transitioned to steel only for the vertical 2 1/2" up to the hose valves on the dock.

Any information to point us in the right direction would be helpful. Thanks in advance.

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What does "listed for fire protection use" actually mean?

The Department of Defense specifications Section 21 13 13 calls for backflow preventers to be "listed for fire protection use".

From what I have found, there is no such specific listing.

Has anyone else heard of this?

Thank you for your input.

​

Hi everyone - thanks for answering my previous questions and for checking out today's as well.

I have three projects all connected to the same central fire pump assembly. It's a huge network of pipe running for miles. 

The client is having a problem with the fluctuating pressure (up and down) on the network for some reason that affects the fire pump's suction pressure. It's in series, and connected to each project.

The client refuses to add a break tank and cut the fluctuation. 

In your experience, is there any alternative solution available? 

Would a pressure relief valve help? What would happen when the pressure is less than design?

Thanks in advance!

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In regards to installing pressure reducing stations for separating areas of the building into different pressure zones, NFPA 14 calls out that the FDC needs to be installed downstream of the pressure reducing valves.

Is a separate FDC required for each pressure zone?

If you provide just one FDC, and the fire department supplies the system for an upper floor of a high-rise, you will exceed the maximum working pressure of the lower systems. I'm not sure how that's possible to avoid.

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Can the pipe from a remote FDC at the front of our building route under the building slab to connect to our fire pump room at the back of the building?

The Fire Pump Room is on the basement level.

This is for a six-story hotel with a partial basement along the back portion of the building that is open to a lower grade level in back. Here's a sketch below.

The fire marshal requires a remote FDC at the sidewalk in front of the building. Our fire pump room happens to be on the opposite side, in the back.

The most straightforward routing is below the building, but it is minimum 60' of run which certainly exceeds the 10' maximum distance allowed for the fire supply from NFPA 13.

Going above the first floor ceiling is challenging given all the interiors/ceilings, public spaces, and glass at the street front.

Given that the FDC pipe is normally-dry and not pressurized, do we have the same restrictions of 10' max below grade?

Even if not, can't say I'm thrilled about having that many joints below our building above. Thanks for your help/thoughts!

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Do open (exterior) stairs need standpipes?

If the stairs are more than 50% open, sprinkler protection is not required but what about standpipes?

This building has three stairways. Two are interior and one is open and on the exterior. Standpipes are provided in the two interior stairways.

Thanks in advance.

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I have a plan reviewer that is not accepting our proposed design for a manual standpipe calculation.

The calculation shows a required pressure on the fire department pumper truck to be a minimum of 217 PSI.

It has been confirmed that the pumper truck can reach and/or exceed 250 PSI.

The AHJ is requesting that we increase the standpipe from 4-inch to 6-inch, which is not alleviating the higher pressures as we are still above 175 PSI.

This would be a first for me to have to install pressure reducing hose valves on a manual wet standpipe.

My understanding per NFPA-14 (2016) 7.2.3.2 is that this is only an issue when the static pressures on the systems exceed 175 PSI (city static is 113 PSI).

So in essence, we are advising the fire department pumper truck operator to dial his pump up to 217, but this wouldn't be static, as they would be flowing out of the hose valve(s), correct?

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We are working on a new (750 gpm) standpipe system.

When testing and setting the field adjustable 2-1/2" PRV hose valves, do you set each one flowing 250 gpm while also flowing 500 gpm elsewhere, to account for the hydraulically calculated design (i.e. lower inlet pressure per NFPA 14-11.5.5.1)?

Or do you just set each one only flowing 250 GPM by itself?

Thanks in advance.

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I have a highrise that exceeds 400-ft in height. The engineer designed a combination riser with all of the floor control assemblies coming from one riser, and not alternating as is in code. 

I'm wondering if there's something I'm missing - any way around alternating the floor control assemblies, like upper-level pumps being considered separate systems or something of the like?

​Looking for better understanding here and being sure I'm not missing something bigger picture. Thanks in advance.

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NFPA-14 2019 Edition. There is a new section in NFPA 14 - Section 7.8.1.2.1:

The pressure required at the fire department connection for manual standpipes shall not exceed the working pressure of the system components of the standpipe system or sprinkler system when the system is a combined system.

Does anyone have any idea why this was added?

It seems to me that the maximum pressure at the FDC would be 175psi as this is what the sprinklers are rated.

Pumping at that pressure I would never get the 100psi required at the top of the most remote riser.

Or am I interpreting this section incorrectly?

Thanks in advance.

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Hi All, Is there a code reference on the maximum amount of time allowed to close a wall PIV (or any valve for that matter)?

I have a Wall PIV that is hard and slow to turn, and takes about 30 minutes of fighting to fully close. Servicing of accessible components has not helped.

I probably won't be able to get funds to repair/replace unless I can quote a code violation.

I have only found a minimum amount of time, but nothing for a maximum. Thanks in advance!

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Is there support in the standard to require a control valve supplying a combination sprinkler/standpipe system (standpipe isolation valve) so that a ladder wouldn't be needed to close the valve?

All control valves are to be accessible, but not necessarily readily accessible.

I like to require that they not be installed more than 7-ft, but am looking for code guidance here. 

Is there code justification for 7-ft valve requirement?

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