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​FURTHER STUDY

Prep Guide 2020 #151

1/20/2021

2 Comments

 
This issue has been confusing to me for a while, according to the calcs below on Meyerfire Prep 2019, it looks that Lumens = cd, I doubt this is correct.

If I search the internet, there are should have a factor, which is the solid angle.

Cd = lumens/ sr

From Wikipedia I found that E is Illuminance which is in lumens/m^2 which is the incident flux on a surface, as in the problem. One lumen per square meter is a Lux.

Are the units on this correct?
2 Comments

Prep Guide 2020 #183

1/12/2021

1 Comment

 
Problem 183:  For the final step, “Volumetric Flow Rate of Smoke,” the unit obtained as you show would be ft^3/s.  So, in order to obtain the final answer in CFM, the value in ft^3/s should be multiplied by 60 in order to convert to ft^3/min, or CFM.

Is this valid?
1 Comment

Prep Guide 2020 #122

10/12/2020

3 Comments

 
VN: For Problem 122, I wanted to check if I was breaking down the solution properly.  I'm not seeing the end solution of EH1 in NFPA 13 Table 13.2.1.

Could you take a look at the assumptions below and let me know if I'm missing something or assuming the incorrect storage configuration?

Below is the information extracted from the problem statement:

synthetic fiber (less than 50/50) - Class III (NFPA 13 Table A.5.6.3)
natural fiber clothing - Class III (NFPA 13 Table A.5.6.3)
rayon - Class IV (NFPA 13 Table A.5.6.3)
unexpanded plastics 

Since movable racks, treat as multiple row rack storage.  Storage directly on shelves more than 50% open, so exposed storage. Storage height 10'6".

Assuming unexpanded plastics as the worst case, I'm ending up at either OH2 or EH2 depending on max ceiling height which isn't specified in the problem.
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3 Comments

Prep Guide 2020 #151

9/29/2020

1 Comment

 
BM: Looking for clarification on problem 151. Why do you use the full length of the room (12.8m) when the strobe is centered on that wall (6.4m)? Wouldn’t this make the farther distance for the sound to travel be the 9.2m? Yielding answer b, 34cd?
1 Comment

Prep Guide 2020 #52

9/25/2020

1 Comment

 
JD: Can you explain the logic used in determining the answer to Question 52 – I am having a hard time understanding why a central station would not be correct or is less correct that the Proprietary Supervising Station?
1 Comment

Prep Series 2020 Week 17 #1

9/25/2020

1 Comment

 
JM: For number 1 - is this something we would be expected to know? The NCEES handbook doesn't provide this equation for calculating convective heat transfer coefficient.


From Joe: Yes, it's actually in NCEES 3.3.2 although I didn't have that referenced there.

JM: Quick follow up question on 1. In NCEES section 3.3.2, the equations to solve for "h" aren't available.

​

Read More
1 Comment

Prep Series 2020 Week 17 #9

9/23/2020

1 Comment

 
JM: ​For number 9 - would option c also be correct? NFPA 13 states that K-16.8 uprights are acceptable, but doesn't list pendants as being acceptable.

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1 Comment

Prep Series 2020 Week 16 #8

9/20/2020

2 Comments

 
JG: Please see question #8 of week 16 attached and the reference from page 16-102 of the 20th edition of the Fire Protection Handbook,  listing dormitories under the NFPA 13D standard.  What are your thoughts?

Read More
2 Comments

Prep Series 2020 Week 15 #7

9/20/2020

2 Comments

 
JG: ​Please see my question and solution attached.  The question references space which infers the quantity of agent. It does not ask for concentration.  Based on concentration the solution is correct.  But by assuming an ambient temp of 70 degree F,  the ranking order would be differ from the solution.  Which is related to space/quantity of agent, what the question asks.  Am I missing something?
What are your thoughts? 

TH: ​I just wanted to check with you about this question.  Isn't the quantity of agent also dependent on the specific volume of the agent?  That lead me to put the answers I had after reviewing the Table A.5.5.1 and Table A.5.5.2 volume requirements.  I checked for varying temps (70F and 10F) and still ended up with the same order I input in the screenshot below.

Read More
2 Comments

Prep Guide 2020 #156

9/20/2020

2 Comments

 
MF: ​On problem 156. When I look at Table 6.1.14.4.1 for bulk retail and apartments a 3 hour rating is required. With sprinklers we can lower this by 1 hour to 2 hours. I am not seeing where this table has 2 hours for bulk retail and apartments.
2 Comments
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  • Blog
  • Daily
  • Exam Prep
    • CFPS Tools
    • NICET Tools
    • PE Forum & Errata
    • PE Problems
    • PE Store
    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FIRE FLOW CALCULATOR*
    • FRICTION LOSS CALCULATOR
    • HANGER SPACER
    • IBC TRANSLATOR*
    • K-FACTOR SELECTOR
    • NFPA 13 EDITION TRANSLATOR ('19 ONLY)
    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
    • LIQUIDS ANALYZER*
    • OBSTRUCTION CALCULATOR
    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
    • TRAPEZE CALCULATOR
    • UNIT CONVERTER
    • VOLUME & COMPRESSOR CALCULATOR
    • WATER SUPPLY (US)
    • WATER SUPPLY (METRIC)
  • TOOLKIT
  • LOGIN
  • STORE
  • About