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

Flexible Drop with Smaller K-Factor?

7/24/2019

5 Comments

 
I was reviewing a sprinkler plan using flexible house from an arm over. The head had a k factor of 5.6 and the flexible hose had a k-factor of 4.86 with the pressure and flow at the head. This seems like a mistake. Wouldn't you want a flexible hose with a k-factor of 5.6 or larger?

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5 Comments
Wayne Ammons
7/24/2019 06:45:56 am

Can you share what model flexible hose was used and where you saw a K-factor of 4.86?

Reply
PETE
7/24/2019 10:52:41 am

You're probably looking at the equivalent K factor of the head with the UL/FM 1" Schedule 40 equivalent feet of loss for the flexible hose assembly added. K for the hose and head would use the same Q required for the head per it's UL listing, and a P value that is some higher value than the head by itself to account for the friction loss in the flexible hose. Since K=Q/sqrt(P), an increase in P will correspond to some K lower than the K factor of the head by itself.

Reply
Max Newton
7/24/2019 08:54:17 pm

As Pete said the equivalent k factor of the flex drop at branch pipe will always be less than the sprinkler k factor. Flex drops are useful to lower over-discharge by maintaining smaller k factors.

Reply
John
12/5/2019 08:33:14 pm

Can a NFPA13R multi-residental apartment building use commercial concealed pendent sprinklers with standard response instead of quick response?

Reply
MODERATOR
12/6/2019 08:48:52 am

Hi John - see here for your question as a new daily post:

https://www.meyerfire.com/daily/nfpa-13r-use-standard-concealed-in-lieu-of-qr

Thanks!

Reply



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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)
    • COMING SOON
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
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