×
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

Fixture Unit Counts for Uniform Plumbing Code (UPC)

Fixture Unit Counts for Uniform Plumbing Code (UPC)

Fixture Unit Counts for Uniform Plumbing Code (UPC)

(OP)
I am attempting to use fixture counts to determine the demand in my water model. However, for the flushometer valves (water closets)there are two tables in the Code, one is in Chapter 6 table 6-5, and another one in Appendix A table A-2. The two give very different values for the same fixture being flushometer valves. I need help in trying to determine which table I should use?

I read through the code, but can't find any clear description about why I would use one table over another. Thank you, for any assistance!

RE: Fixture Unit Counts for Uniform Plumbing Code (UPC)

You need to be very careful when trying to equate plumbing fixture units to civil gpm in a model. Fixture units are statistically derived values which relate probability of use to flow. 100 fixture units in an office building will give you a much different flow than 100 fixture units for a sports stadium.

Example is 10 water closets is roughly 100 fixture units. Using Hunter's curve (statistical evaluation of flow), which the UPC is based upon, you would expect the peak flow to be around 67.5 gpm, which is a bit more than 2 water closets flushing at the same time. In the stadium, you could have all 10 water closets flushing simultaneously, which could require a peak flow of 250 gpm.

If you are going to use them, use the table in Chapter 6 since it is in the requirements and the appendix is not.

RE: Fixture Unit Counts for Uniform Plumbing Code (UPC)

(OP)
Thank you, for your response!

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