×
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

Domestic demand vs. fire demand

Domestic demand vs. fire demand

Domestic demand vs. fire demand

(OP)
I have a college laboratory building with a combined fire/domestic water supply entering the building and then splitting.

Fire demand is governed by 2 standpipes at 750 gpm.
Sprinkler demand is O1 which ends up less than the standpipes.

Domestic demand for the building is also 750 gpm.

Does the sprinkler designer add the domestic demand to the fire demand, or can it be ignored?  Would the combined demand be 1500 gpm or is 750 gpm sufficient?

I am a consulting engineer and my goal is only to size the combined service on the plans for bidding purposes.

Thanks for any responses.

Chaz

RE: Domestic demand vs. fire demand

depends on how many people will be flushing toilets while the place burns...  Size for the maximum of the two.

RE: Domestic demand vs. fire demand

Usually sprinkler designers don't include domestic water use in their calculations unless the building is designed per NFPA #13R where it is mandated.

In the event of a fire, with fireman coming up stairwells, alarms sounding off and sprinklers discharging I doubt anyone will stick around to finish their shower or continue an experiment.

Unless told otherwise I doubt a single sprinkler designer out here would include any sort of domestic demand for a building designed per NFPA #13.  I wouldn't.

RE: Domestic demand vs. fire demand

(OP)
Thanks for your responses, much appreciated.

Chaz

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