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When Does a Low Header Require Two Detectors?

8/30/2019

1 Comment

 
A dormitory has residential rooms which house two students. There is a traditional sleeping area approximately 12 ft x 12 ft, and a hallway with a bathroom and closet in-between the sleeping area and the main corridor.

Separating the sleeping area and the unit hallway is an opening about the size of a door opening (but with no door). This project is still in design.

How shallow would the header on this opening need to be (distance from the ceiling), in order to avoid requiring a smoke detector in the sleeping area and the hallway?

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1 Comment

Fire Protection Freelancer Insurance, Healthcare?

8/29/2019

3 Comments

 
For those that do freelance design, what avenues would you recommend to get professional liability insurance? I would think there'd be some insurers that understand our industry more than others, which could be a better starting point than googling insurance brokers.

I'm in the same boat for healthcare too - do you go with the open marketplace or are there any trade groups that offer group plans (like an NFSA or AFSA)? Just looking for starting points to make sure I vet all avenues. Thanks in advance for any input.

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3 Comments

PE Problem #61

8/29/2019

3 Comments

 
​​Annual inspection of wet barrel hydrants must include all of the following except:
a. verify marking of hydrant
b. verify outlet thread condition
c. verify access to hydrant
d. verify cracks in hydrant barrel

Solution | Posted 08/30/19

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3 Comments

Resources for New Marijuana Grow Facilities?

8/28/2019

5 Comments

 
Does anyone have good resources (articles, design guidance) for fire suppression systems protecting new marijuana grow facilities?

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5 Comments

Cloud Ceilings: Calculate Above or Below Only?

8/27/2019

2 Comments

 
When there's a cloud ceiling that requires sprinklers above and below, how does that play out in the hydraulic calculations? NFPA 13 23.4.4.5 implies that we should only include the upright heads at the ceiling and exclude the pendants in the floating clouds from the remote area calculations. Do you think that's the right call?

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2 Comments

PE Problem #59

8/27/2019

7 Comments

 
Consider the following fire hydrant flow tests conducted at the same elevation:
   Test A: 75 psi Static, 60 psi Residual at 1,200 gpm
   Test B: 65 psi Static, 60 psi Residual at 1,800 gpm
   Test C: 70 psi Static, 45 psi Residual at 1,200 gpm

​Which of the following is true?
a. Test A would provide better pressure than Test B for a 1,500 sqft Light Hazard sprinkler system.
b. Test A would provide better pressure than Test B for a 3,000 sqft ESFR sprinkler system.
c. Test B would always provide better pressure than Test C for any type fire sprinkler system.
d. Both a and c.

Solution | Posted 08/28/19

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7 Comments

Convenience Stair Separated from Corridor?

8/26/2019

2 Comments

 
Our project has a proposed layout includes convenience stairs next to a corridor that serves restrooms, utility spaces, and doors to large open office areas. It's a B-occupancy subject to NFPA 101 requirements.

As a side note, the International Building Code (2018) makes it clear that two-story openings are permitted in occupancies other than I-2 and I-3 when they meet certain limitations, per section 712.1.9. One of the limitations it that is it not open to a corridor, but that's in Group I or R occupancies only. Group I and R occupancies require special treatment for corridors.

NFPA 101 has similar provisions for Convenience Openings (Section 8.6.9). One of the requirements is that "such openings shall be separated from corridors", per section 8.6.9.1(3). If corridors in a building are not required to be separated (such as for an open-office B occupancy), does this requirement still apply, or is this section saying that we have to have rated corridors whenever we have convenience stair openings?

   8.6.9 Convenience Openings.
  8.6.9.1 Where permitted by Chapters 11 through 43, unenclosed vertical openings not concealed within the building construction shall be permitted as follows:
   (1) Such openings shall connect not more than two adjacent stories (one floor pierced only).
   (2) Such openings shall be separated from unprotected vertical openings serving other floors by a barrier complying
with 8.6.5.
   (3)* Such openings shall be separated from corridors.
   (4)* In other than approved, existing convenience openings, such openings shall be separated from other fire or smoke compartments on the same floor.
   (5) In new construction, the convenience opening shall be separated from the corridor referenced in 8.6.9.1(3) by a smoke partition, unless Chapters 11 through 43 require the corridor to have a fire resistance rating.
   (6)* Such openings shall not serve as a required means of egress.

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2 Comments

PE Problem #58

8/26/2019

5 Comments

 
​In which of the following scenarios is neither explosion protection nor suppression system required?
a. Flammable paint warehouse mixing rooms where open transfer of paint occurs
b. Dust ventilator equipment where the dust density can be above its lower flammability limit
c. Mechanical room where service equipment is subject to explosion
d. All of the above require either explosion protection or suppression systems

Solution | Posted 08/27/19

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5 Comments

Prep Series Week 12 Leaderboard

8/26/2019

 
Picture
The Leaderboard lists the top total scores for the most recent three weekly exams for PE Prep Series participants. 
See the entire scoreboard here.

​
Picture
Want to join in? It's not too late - the PE Prep Series is the ultimate PE Prep tool. It's a series of 1-hour, 10-question simulated PE Exams offered weekly with solutions immediately following each exam. Learn more here. ​​​​Every week of the series is retroactive so you can still test yourself with past week exams

Restraint for Long Sprinkler Drops in Seismic Area

8/23/2019

14 Comments

 
I have a warehouse with a roof 20 feet above. The designer has branch lines hanging under the ceiling joists. He has 10 foot drops of 1-1/2" sched 40 to an ACT ceiling over office spaces. We are in a "D" seismic design category building. I am unable to find any requirements for vertical restraint in the NFPA 13 or ASCE 7-10. Can anyone direct me? 

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14 Comments

Hydrostatic/Leak Test for Sprinkler Relocations?

8/22/2019

5 Comments

 
Does a hydrostatic test need to be performed for a project that just has relocated sprinklers, or just a leakage test subject to working pressure?

I'm having trouble finding where NFPA 13 gives guidance on this. Any help is appreciated.

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5 Comments

PE Problem #56

8/22/2019

4 Comments

 
An warehouse facility is seeking to store cartoned Level 3 aerosol products on pallets. If the storage height is 10 feet in height with a 23 foot ceiling, what minimum k-factor must be provided for the ceiling-level sprinklers protecting this area?
a. K-8.0
b. K-11.2
c. K-14.0
d. K-16.8

Solution | Posted 08/23/19

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4 Comments

How to Restrain Sidewall Sprinkler?

8/21/2019

4 Comments

 
In NFPA 13 under "Location of Hangers on Branch Lines", Section 9.2.3.6 (2016 Edition) states that "wall-mounted sidewall sprinklers shall be restrained to prevent movement."

This section does not relate to seismic restraint, and annex material clarifies as much.

How is this sidewall-restraint typically achieved? 

Many sidewall sprinkler installations have an armover and a drop that goes down the wall before a reducing elbow serves the sprinkler in the wall, and I don't recall ever seeing a means to restrain the pipe (or sprinkler) for steel jobs.

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4 Comments

PE Problem #55

8/21/2019

4 Comments

 
Hydrogen gas will combust at which of the following percent volumetric concentrations in air?
i. 2.5%
ii. 35%
iii. 65%
iv. 85%
​
a. ii and iii
b. iii and iv
c. ii, iii, and iv
d. i, ii, iii, and iv

Solution | Posted 08/22/19

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4 Comments

Is A Bulk Feed Allowed in Interior Exit Stair?

8/20/2019

1 Comment

 
Do you have any thoughts or input on the interior exit stair penetration limitations of Section 1023.5 of the IBC? 

I have someone contending that you aren’t allowed to run a “bulk feed” main into a stairtower and then back out again on a different level.  They claim that 1023.5 limits penetrations only to MEP equipment that serves the stairwell itself.  I contend that, especially as clarified in the 2018 edition (although I contend that it was always the intent), any fire protection system is allowed to penetrate such a stairtower as needed, as long as the penetrations are correctly firestopped etc…
 
The confusion comes from the 2015 edition, which reads (emphasis added to indicate the confusion that I think this person is having):

“Penetrations into or through interior exit stairways and ramps are prohibited except for equipment and ductwork necessary for independent ventilation or pressurization, sprinkler piping, standpipes, electrical raceway for fire department communication systems and electrical race-way serving the interior exit stairway and ramp and terminating at a steel box not exceeding 16 square inches.  Such penetrations shall be protected in accordance with Section 714.  There shall not be penetrations or communication openings, whether protected or not, between adjacent interior exit stairways and ramps.”
 
I believe that that person is seeing that “serving the interior exit stairway and ramp” portion of that snippet, and they are applying it to everything.  However, I contend that that is actually applying specifically to “…and electrical race-way serving the interior exit stairway and ramp and terminating at a steel box not exceeding 16 square inches”.  I think that the person is cherry picking what they want it to say, although it is somewhat confusing the way it’s all written on one line.  I believe that if that person really wanted to apply this verbatim, then you would not even be allowed to have combined standpipes that feed sprinkler systems outside the stairwell, or even dedicated sprinkler risers in the stairwell wouldn’t be allowed to serve any floor area outside the stairwell.  Basically any sprinkler riser in a stairwell would only be allowed to feed that specific stairwell…  I think it’s clear that this is not the intent of the code.

Read More Here

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1 Comment

PE Problem #54

8/20/2019

4 Comments

 
An open, unobstructed space connects an entry level lobby with a balcony on the level above in a fully sprinklered residential building while separated from the remainder of the building with a smoke barrier. If the space only has low hazard contents and meets egress requirements, what type of space does it qualify as?
a. Atrium
b. Communicating Space
c. Convenience Opening
d. Two-Story Opening with Partial Enclosure

Solution | Posted 08/21/19

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4 Comments

Method to Determine Closely-Spaced Sprinklers?

8/19/2019

2 Comments

 
NFPA 13 Section 8.15.4 (2013 Edition) requires certain types of unenclosed floor openings to be protected with closely spaced sprinklers where sprinklers serve as an alternative to the enclosure of the vertical opening. 

What method do you use to determine if the opening requires enclosure, and thus closely-spaced sprinklers? 

As a sprinkler designer, I may overlook something in the Building Code that allows the unprotected opening, or vice versa.

A pre-bid RFI to the architect seems to be the best course, but it would be nice to have something to hang the hat on before the bid is submitted.

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2 Comments

PE Prep Series Week 11 Leaderboard

8/19/2019

 
Fire Protection PE Exam Prep
The Leaderboard lists the top total scores for the most recent three weekly exams for PE Prep Series participants. 
See the entire scoreboard here.
Fire Protection PE Exam
​Want to join in? It's not too late - the PE Prep Series is the ultimate PE Prep tool. It's a series of 1-hour, 10-question simulated PE Exams offered weekly with solutions immediately following each exam. Learn more here. ​​​​Every week of the series is retroactive so you can still test yourself with past week exams

Correction on the Week 11 Exam: Question #8 asked for the carbon dioxide quantity in kilograms but the solution was in pounds. The correct answer is 156 lb, or 71 kg. This has now been updated in the series for future users.

How to Prevent Warped Small Welded Pipe?

8/16/2019

5 Comments

 
I've heard from several installers that small diameter schedule 10 pipe (such as 1-1/4") will warp if there's more than two welded outlets made onto it.

Would any installer/contractors weigh in on how you best combat this problem?

I could see larger diameter (1-1/2" or more) schedule 10 as a possible solution, which also helps hydraulics. I could also see voluntarily going to schedule 40 as a possible solution. Cutting the pipe into shorter segments and adding couplings would also help, but I could see the cost adding up for the labor, couplings, and additional hangers.

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5 Comments

Need to ID Each Rated Through-Penetration?

8/15/2019

2 Comments

 
The International Building Code requires identification of fire partitions, barriers, or fire walls with 3" letters identifying the wall itself.

I've seen (especially in hospitals) labels for each through-penetration with a UL Listing sticker right below each penetration. Is this a requirement by code, or just a hospital standard?

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2 Comments

Can Sprinkler be Enclosed in Small Closet?

8/14/2019

2 Comments

 
My son has purchased a condo, (prior apt conversion). They removed the closet doors in the living room related to an air flow vent return on one side when the central air was added.

There is a sprinkler in the center of the former closet. I was told I can not enclose the sprinkler in a closet when I wanted to build the closet doors 3/4 of the way, (leaving 35 inches for the air flow vent). So, now the closet would be only 40" wide. Do you know in MN if I can enclose the sprinkler? Thank you.

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2 Comments

PE Problem #50

8/14/2019

3 Comments

 
​Which of the following arrangements is not permitted for a new prison, under NFPA standards?
a. Sprinkler Protected, Type II (222) Construction, High-Rise Building
b. Sprinkler Protected, Type II (000) Construction, 3-Story Building
c. Sprinkler Protected, Type IV (2HH) Construction, 2-Story Building
d. Sprinkler Protected, Type V (000) Construction, 1-Story Building

Solution | Posted 08/16/19

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3 Comments

Protection for Type II Exhaust Hoods?

8/13/2019

2 Comments

 
Once again great info/insight. Though it made me think.

What if you have a type II hood without wet chem protection? Are sprinklers required? I think yes (following obstruction rules).

To take it a step further, what if you have a type I hood with protection over the required appliances including the plenum but not below the plenum in areas where there are ovens/non-cooking equipment? As an AHJ, I have never required additional protection here. But now I question myself.

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2 Comments

PE Problem #49

8/13/2019

2 Comments

 
Determine the required thrust block volume (in cubic feet) for a 45-degree elbow serving a wet 6-inch schedule 10 pipe in sandy silt with a 50% safety factor added. The water within the pipe has a maximum pressure of 140 psi and the block material has a density of 150 pounds per cubic foot.
a. 28 cubic feet
b. 31 cubic feet
c. 44 cubic feet
​d. 63 cubic feet

Solution | Posted 08/14/19

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2 Comments

Fire Alarm Shop Drawing Industry Makeup?

8/12/2019

2 Comments

 
I'm considering testing for NICET fire alarm certification. What I don't yet know and would be very interested in is who typically prepares fire alarm shop drawings? 

Do freelance fire alarm designers/engineers make up a large portion of shop drawing preparation, or is it mostly all completed by a fire alarm company's designer? Do large manufacturers (Simplex/JCI) complete all of their own shop drawing work with in-house designers?

Thanks in advance - I'm trying to get a better perspective for my career.

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2 Comments
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