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CMDA, CMSA for 12-ft of Storage with 25-ft Roof?

9/29/2023

3 Comments

 
We have storage of Class I-IV commodity, in racks, with maximum distance from floor to top of storage of 12-ft with 10-ft aisles and roof deck at 25-ft.

The AHJ correctly asserts that this storage is not incidental to the occupancy and therefore cannot be considered as "miscellaneous storage".

Is there a way that these racks can be suppressed with roof-only sprinklers, preferably CMDA or CMSA?

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
3 Comments

Decision-Tree for FP for Liquid Storage Tanks?

9/28/2023

3 Comments

 
Is there a decision tree, or other wholistic look at what is recommended for fire protection measures for flammable and combustible liquid storage tanks?

Does flashpoint of the liquid impact which system type to pursue?

This is specifically for liquid stored in day tanks inside a tank farm, but seeking out guidance here on choosing responsible systems overall.

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
3 Comments

Waterflow for Each Floor in 47,000 sqft Building?

9/27/2023

6 Comments

 
We have a small building (less than 47,000 sqft) with basement, ground floor, first floor and roof protected with a sprinkler system. Fire pump room is in the basement.

In NFPA 13-2022, Section 16.9.10.3, there is no need to install floor control valve assembly (no need for sprinkler system either, but client insisted).

I've never designed such a small system; and as a result I have a couple questions:

(1) Is one flow switch after the fire pump sufficient for all floors? If not, do I need to provide each floor with a flow switch?

(2) Is an alarm check valve assembly required? If so, can it be used instead of a waterflow switch, or do we need to install both?

Any other tips for a smaller building would be greatly appreciated. Thanks in advance.

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6 Comments

Use 65 or 100 psi for Manual Class III Standpipe?

9/26/2023

5 Comments

 
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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5 Comments

Best Way to Limit "Sprinkler Loading" on Install?

9/25/2023

6 Comments

 
We have a project in Geelong, Australia, where the product that is bulk-stored within the building makes for an extremely dusty environment when it is unleaded.

Sprinkler protection is proposed to protect the building - but I wanted to ask the question about "excessive loading of sprinklers".

What's the best option to minimize the loading on the sprinkler?

NFPA 25 mentions this, of course, but our code in Australia does not mention this term but does state that the sprinklers need to be visually checked annually, and suggests that a more stringent maintenance routine be in place for these environments.

The bulk product is phosphate rock and it typically used for the fertilizer manufacturing plant across the road.

Any suggestions would be much appreciated.

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6 Comments

Use 13, 13R, or Both, for Mixed M+R Occupancy?

9/22/2023

9 Comments

 
We have a rehab of a two story with a walk out basement where they are going to expand the basement level and make it mercantile with the two upper floors being R-2.

This is Type V-B construction and they are proposing to 1-hour horizontal to separate the mercantile from the R use. They are wanting to use the standpipes as their sprinkler risers.

My question is three-fold:
1. Can they sprinkler the entire building with 13R, or
2. Can they omit sprinklers completely in the mercantile if they separate from the R use by 1-hour (the mercantile by itself would not require sprinkler protection,
3. Can they sprinkler the mercantile with 13 and the R use 13R without a rated separation?

I am an AHJ and only wanting to require what the Code requires. I am having trouble deciphering the requirements.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
9 Comments

FDC Required for 2-Story, 4-Unit Building?

9/21/2023

5 Comments

 
Is a fire department connection required on a new construction, 2-story, 30-ft tall, four-unit wood-framed building?

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
5 Comments

Valve for Hose Connection on Sprinkler System?

9/20/2023

7 Comments

 
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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7 Comments

Are Flexible Couplings Req'd For Tall Riser?

9/19/2023

8 Comments

 
Are flexible couplings required at riser for vertical support?

My project has a vertical support for a 30-ft long 6-inch riser.

I used a riser clamp with two wall-mounted welded brackets to provide vertical load hanger at about 20-ft AFF.

The inspector commented that I have to provide a flexible coupling above and below within 24" of the point of attachment. His reasoning is: 18.2.3.1(6) NFPA 13 2022 edition (6) Within 24 in. above and 24 in below any intermediate points of support for a riser or other vertical pipe.

Anyone has suggestion for better way to put a vertical support at the riser?

Is one ATR hanger at the top of the riser sufficient?

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments

Tips to Handle a Late Standpipe Requirement?

9/18/2023

3 Comments

 
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.

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
3 Comments

Are Sprinklers Req'd Below Wood Slat Ceiling?

9/15/2023

13 Comments

 
Are pendent sprinklers required below a decorative wood slat feature along the ceiling?

Wood slats vary in height from 4" to 12" but is suspended at ceiling height (9'-0").

The area above the slats is concealed space and requires uprights. The total area percentage of slats is 42% below the concealed space.
Picture
Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
13 Comments

Sprinklers Req'd for A-5 "Performance" Platform?

9/14/2023

10 Comments

 
Asking as an employee of an architectural design firm - we have an outdoor performance center (A-5) with a 6,000 sf performance "platform". It is not being designated as a stage (just lighting and sound above).

This outdoor platform does have a lid/ceiling up about 50-ft with walls on three sides and open to the outdoor seating area.

Would this outdoor space be exempt from sprinkler protection under building code for A-5 guidelines, or should it be treated like any overhang where products underneath might be flammable?

I believe it needs protection, but have not worked on an outdoor A-5 Assembly occupancy before.

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
10 Comments

Req'd Spacing For Sprinklers Under Obstructions?

9/13/2023

4 Comments

 
When protecting underneath a continuous obstruction (example: a duct over 4-ft in width that extends through multiple different hazards), how do you space the sprinklers beneath the obstruction?

Industry standard, I would say, is to cover according to the hazard that each individual sprinkler is in.

What code reference states this?

What prevents you from spacing sprinklers underneath the duct at 15-ft throughout the length of the duct rather than switching between Light and Ordinary spacing?

From what I read, NFPA 13 states how to install sprinklers under continuous obstructions but not necessarily what spacing is required in reference to hazard.

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments

Could Someone Please Explain "Phantom Flow"?

9/12/2023

4 Comments

 
NFPA 13 Density/Area Method Chapter 28.2.4.2.3 states that if the design area is smaller than the required minimum design area, you're allowed to include only the sprinklers in the available design area.

However, there's an additional provision. This provision details how to calculate the design discharge.

First, you subtract the flow from the available area from the required minimum design discharge. Then, you add this difference back into the equation. Essentially, this brings you back to the flow discharge of the required minimum design discharge.

Could someone explain this provision?

Is this calculation done to account for potentially higher flows in the main header?

What flow then determines the maximum flow for sizing a fire water tank?

I'm looking forward to your answers.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments

Storage Height/Roof with Pallet Storage Above?

9/11/2023

5 Comments

 
Regards from Norway -

Modern storage and picking racks often combine small units, both bins and cartons, in flow-through for picking in the lower part, and ordinary pallet storage above. I believe this is common worldwide, but few sprinkler standards, if any, provide guidelines on vital parameters.

Case: We're dealing with ordinary open pallet racks. The commodity class is up to 3 (possibly 4). The picking height is up to 7-ft (2.0 m) based on mini wheel flow-throughs. Above that, there are 4-5 standard pallets with total net storage heights of 26-ft (8.0 m) in a building with a 39-ft (12 m) ceiling height.

It seems feasible to protect the pallets with ceiling-only sprinklers. However, there's no vertical alignment with any transverse flue spaces in the picking part. It seems logical to install a horizontal fire barrier above this area. How should we protect the lower part of the racks?

Should the ceiling sprinkler water demand be based on 26-ft (8 m) storage at a 39-ft (12 m) ceiling height, or 26-ft (8 m) at a 33-ft (10 m) ceiling height, measured from the top of the in-racks for the picking area?

I hope someone has a view on this matter. A not-yet-finalized version of EN 12845-1 has some parameters for systematically constructed automatic small unit storage, but my actual case is for manual operation and is not specifically systematic for the small units area in only a couple of the racks.

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
5 Comments

Omit Sprinklers in Small Stadium Water Closets?

9/8/2023

11 Comments

 
I'm reviewing a stadium project. The maximum available open vertical distance from WC stalls to the ceiling is 11.8-inches (300mm).

According to NFPA 13, table 10.2.7.2.2 (2019 Edition), the horizontal distance allowed from stall to sprinkler is 14.8-inches to 17.7-inches (375mm to 450mm). The width of the WC cubicle is 33.5-inches (850mm), so sprinklers must be provided in each cubicle.

This will result in many sprinklers in a wet area that has non-combustible or limited combustibility materials. Therefore, I've suggested sealing the cubicles up to the ceiling to create small WC rooms less than 55 sqft (5.1 sqm) to eliminate sprinklers. To my knowledge, there are no references that support this option for such an occupancy.

Is my suggestion to omit sprinklers in these small compartments consistent with the spirit of NFPA 13?

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
11 Comments

Proper Way to Protect High-Piled Alcohol?

9/7/2023

4 Comments

 
What is the proper method for protection of high-piled storage of consumer packaged alcohol with an ABV greater than 20% when stored on racks?

Rack storage will be 30-ft maximum height.

I'm assuming plastic and glass containers within cartons.

There seems to be a scope gap between NFPA 13 and NFPA 30 here, just wondering what protection methods others might have used.

Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments

Best Way to Cut & Cap Existing Welded Outlet?

9/6/2023

9 Comments

 
We have a project fitting a backflow preventer (Watts 757) where none previously existed.

Due to the tight space available, we would be cutting an existing pipe, and providing an elbow in order to gain some working space, and installing new pipe after the DCVA to an existing pipe end that currently has a grooved cap in place.

Where we cut the pipe, I am anticipating welding a flange to the cut pipe to attach the new elbow with a grooved/flange adapter. The other pipe end created by the cut will require a cap.

What is the best way to seal off this resultant stub?

Is a welded flange the best way to attach to the existing pipe?
Picture
Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
9 Comments

Fire Sprinkler System Without Water Supply?

9/5/2023

15 Comments

 
Client wants us to install a fire sprinkler system that is not connected to an automatic water supply.

This is a small marina located on a large body of water that could eventually serve as an automatic water supply, but not in the immediate future. This marina is about 4,000 sqft and I would like to provide an OH2 pipe schedule system that would clearly be identified in the contract documents and drawings that the system is not connected to an automatic water supply and therefore is not considered to be in accordance with NFPA requirements until connected to an automatic water supply or other means is provided and found acceptable to the AHJ.

The end goal here is to install a system that eventually will be tied into an automatic water supply.

Any thoughts? Good...Bad...Indifferent?

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15 Comments

Are Fire Sprinklers Required to be Accessible?

9/4/2023

8 Comments

 
I got asked a weird question about NFPA 13 requiring sprinklers to be readily accessible.

A co-worker told me they didn't believe some sprinklers that would installed in a mechanical room we're designing would be easily accessible post-construction and asked if there were any kind of access requirements.

I can't think of anything in NFPA 13 that would require every head be easily accessible in the same way that NFPA 72 requires certain fire alarm components to be readily accessible.

Is there a requirement that sprinklers be accessible?

Where does this stem from?

Thanks in advance.

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8 Comments

Total Flow - Hose Allowance for Feed Main Size?

9/1/2023

8 Comments

 
Ok, everyone, I've gotten myself really mixed up today. This is like one of those times where you're asking yourself "is this really how 'the' is spelled?"

This is for design intent calculations only.

When you do your friction loss calcs on an extra hazard group 2, a 0.40 gpm/2,500 sqft, are you using the total flow demand minus hose connection?

As an example, if I need to run 375 ft of pipe and I know that my most remote sprinkler requires 40 gpm (remember, this is only for design intent!) I am typically multiplying my distance by 1000 gpm for worst case scenario. The sprinkler contractors will do the detailed steps back to the nodes and mains.

Hopefully I can right myself back up. Just one of those weird times. Thanks in advance.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments

Sprinkler Req'd Below Wood Stairs in NFPA 13R?

8/31/2023

3 Comments

 
In the stairway, on the 2nd floor only of 4-story wood-framed condo (NFPA 13R), do we require a sprinkler on the “extended landing” ?

In the attached image Blue is the sprinkler in question, red are the required sprinklers.
Picture
The main floor requires coverage because it has two entrances / exits from the stairway. The upper floor has full protection of the entire area. The 3rd floor does not require protection as the 4th floor does not have a extended landing. So this only applies to the 2nd Floor.

Thanks in advance.

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3 Comments

Ground Floor Standpipe Hose Connection Req'd?

8/30/2023

13 Comments

 
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.

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
13 Comments

Tank Size for Simultaneous Sprinkler & Fire Flow?

8/29/2023

6 Comments

 
Long question - in essence - is Fire Flow considered on top of a flowing sprinkler system?

Recently there was a great discussion on the forum here about whether a water storage tank size needs to include Fire Flow in addition to sprinkler demand. There were some great points made (www.meyerfire.com/daily/must-water-storage-tank-include-site-fire-flow).

I have just come upon a project where we do have a municipal water supply, but it tapers off very steeply. The flow test in the area was 52 psi static, 25 psi residual at only 650 gpm. This would put the available Fire Flow around 712 gpm at 20 psi for the site.

In order for the AHJ to reduce the required Fire Flow under the IFC, the building(s) nearby need to be sprinkler-protected. This would bring down the Fire Flow requirement to 1,000 gpm at 2-hours, for this setup. The sprinkler system isn't designed yet, but we'd estimate around a 550-650 gpm demand with a fire pump. This gets really interesting based on the prior discussion.


When the fire department shows up on site during a fire, and then starts to pull water, is this Fire Flow in addition to the flowing sprinkler system, or considered separate?

In other words, is the 1,000 gpm (for 2 hours) for Fire Flow on top of a 600 gpm demand for sprinkler (for 60 minutes)?


If the water storage tank needs to meet the demand of the sprinkler and Fire Flow separately, then the calculation comes down to ~300 gpm needed to fill the shortage on Fire Flow, multiplied by 2-hours. That's a tank in the ballpark of 35-40,000 gallons.

If the water storage tank needs to meet the Fire Flow as the sprinkler system is operating, that's a flow of around 1,600 gpm to fight a fire. That's as much as ~900 gpm x 2 hours to a ballpark of 100-115,000 gallons. Huge difference.


I can't find any relevant code that stipulates one way or another, only that the tank must supply the sources it is connected to. 

Am I looking at this correctly? I see sprinkler and Fire Flow needing to be met by a tank that they're connected to, but is the Fire Flow robbing the sprinkler system, or vice-versa?

Thanks so much for reading. This is obviously TLTHFR (too long, thank-you-for-reading).

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6 Comments

Diesel Generator Startup for Electric Fire Pump?

8/28/2023

9 Comments

 
Recently a client determined that they no longer want diesel fire pumps to be provided on their projects. They want electric fire pumps with a diesel generator to ensure reliable power. (Please do not ask why state this desire.)

If a diesel generator is provided strictly for the electric pump assembly, what mechanism do you utilize to turn the generator on when fire pump needs to start up?

​​​​​​​​​​​​​​​​​​​​​​​​Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
9 Comments
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Our goal is to improve fire protection practices worldwide. We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise.

​MeyerFire, LLC is a NICET Recognized Training Provider and International Code Council Preferred Education Provider.

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The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence.

Discussions are solely for the purpose of peer review and the exchange of ideas. All comments are reviewed. Comments which do not contribute, are not relevant, are spam, or are disrespectful in nature may be removed. Information presented and opinions expressed should not be relied upon as a replacement for consulting services. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a small commission for orders placed elsewhere.

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