×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Room Design Method

Room Design Method

Room Design Method

(OP)
I have a project that I am currently working on and have submitted to both the ahj and architect.  The ahj has approved my system and we have started to intall the systems.  There were some minor details I over looked in the inital design and once they were pointed out I took care of them.  On the inital submittal calcs I used the area/density method.  However since some other details are now available I would like to change one of the three calcs. to the room design method.  This is a school with a two story classroom  and single story kitchen and gym.  I have calced the kitchen and gym and the second floor.  The second floor is the area where I would like to do the room design method.  It has an art room and the opposite end of the building away from the riser.  This room has nine heads in it and the most any other room has is six.  What do you all think?

RE: Room Design Method

Are you apply hydraulic calculation rules or pipe schedule rules under NFPA 13? What is the occupancy hazard rating under NFPA 13?

RE: Room Design Method

(OP)
I have calced all three areas and the hazard is light in the area where I want to do the room design method
 

RE: Room Design Method

What is the ceiling height?  Assuming light hazard and you are more than 100 sq ft / head, then you have at least 900 sq ft.  If the ceiling is 10' or less, you can just use the QR reduction and calc 900 sq ft.  Depending on your spacing and such, the 900 sq ft may be less area than your room design method.

Be sure with room design that you have self closing doors, or you have to get up to 2 heads in the adjacent connecting rooms.

Travis Mack
MFP Design, LLC
www.mfpdesign.com
 

RE: Room Design Method

(OP)
I have a ceiling that is open from the 1st floor to the second floor which puts it at 23-0. So I cant do the 900 sq ft. All rooms in the adjacent rooms have two heads and or are small enough that is doesnt require two heads.

RE: Room Design Method

But, if you don't have protected openings as defined in NFPA 13, then you have to take heads in those adjacent rooms as well.  As long as you meet all of the criteria to use the room design method, there is no reason that you can't.

Travis Mack
MFP Design, LLC
www.mfpdesign.com
 

RE: Room Design Method

(OP)
Thank you.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources