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A FORUM FOR FIRE PROTECTION QUESTIONS & PE EXAM PROBLEMS | SUBSCRIBE NOW

When Use Standpipe Pressure Reducing Valves?

11/29/2019

3 Comments

 
On a combination Class I standpipe/sprinkler riser with automatic standpipes, what is your process to determine exactly where pressure reducing valves should be used?

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3 Comments

Standpipe Demand OK Over Fire Pump Rating?

8/9/2019

4 Comments

 
NFPA 20 permits the demand for a suppression system to be between 90% and 140% of a fire pump's rated capacity (NFPA 20-2019 4.10.1 and Annex A.4.10.1). The pressure demand must always be less than the pressure supplied by the pump's performance curve along this range.

Does this concept apply to standpipes? For instance, could a 750 gpm pump provide 1,000 gpm demand for standpipes since it would be running at 133% of its rated flow?

If it can be done, is it good practice?

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4 Comments

Does ADA Apply to Standpipe Hose Connections?

6/12/2019

4 Comments

 
For standpipe hose connections within stairwells, does ADA (Americans with Disabilities Act) restrictions apply to the dimensions of hose valves coming off pipe? 

ADA - 2010 Standard

307.2 Protrusion Limits. Objects with leading edges more than 27 inches (685 mm) and not more than 80 inches (2030 mm) above the finish floor or ground shall protrude 4 inches (100 mm) maximum horizontally into the circulation path.


307.3 Post-Mounted Objects. Free-standing objects mounted on posts or pylons shall overhang circulation paths 12 inches (305 mm) maximum when located 27 inches (685 mm) minimum and 80 inches (2030 mm) maximum above the finish floor or ground. 
​

In particular, I'm wondering if the 4" protrusion limit applies to standpipe hose connections off of a vertical standpipe, and if it does, if it only applies if the standpipe hose connection is pointed into the path of egress?

I would imagine there's some life safety experts that could explain this better than I surely am.

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4 Comments

Distance from FDC to the Nearest Hydrant?

5/20/2019

14 Comments

 
For years on my code calls I have asked the Authority Having Jurisdiction what the maximum distance the nearest hydrant is allowed to be away from a building's fire department connection. I get answers that range from 50 feet to 400 feet or even more.

I was looking into the code basis behind this question, and the only applicable section that I found is the International Fire Code, Section 507.5.1.1 that addresses hydrant locations for standpipe systems:

"Buildings equipped with a standpipe system installed in accordance with Section 905 shall have a fire hydrant within 100 feet (30 480 mm) of the fire department connections. Exception: the distance shall be permitted to exceed 100 feet (30 480 mm) where approved by the fire code official."

Is there any relevant requirement for hydrants near fire department connections for sprinkler-only systems?

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14 Comments

Full Flow Test Required for Manual Standpipes?

5/8/2019

2 Comments

 
NFPA 14 requires standpipes to be full flow tested for the acceptance testing.

Automatic standpipes are fairly straightforward to test, but how have you seen this applied for manual standpipes in mid-rise buildings?

Is this a worthwhile test that will uncover design/installation flaws?

Also, is there any compromised method to meet this requirement?

Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
2 Comments
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The views, opinions, and information found on this site represent solely the author shown 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. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a commission for orders placed elsewhere.
  • Blog
  • Daily
  • Exam Prep
    • CFPS Tools
    • NICET Tools
    • PE Forum & Errata
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    • PE Tools
    • PE Prep Series
  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • COMING SOON
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
    • FLAMMABLE & COMBUSTIBLE LIQUIDS
    • FRICTION LOSS CALCULATOR
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    • K-FACTOR SELECTOR
    • NFPA 13 Translator
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