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!

*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.

Jobs

Fire Hydrant Modeling in EPANET 2.0

Fire Hydrant Modeling in EPANET 2.0

(OP)
I am tasked with determining the fire flow in two proposed hydrants, serving two new facilities, that are connected to an existing water system. I am performing this effort in EPANET 2.0, with which I have intermittent experience with; fire flow modeling is not in that category. I have flow tests for three existing hydrants and need to use these results to model the two proposed hydrants, and I am not sure how to correctly build the model(s) and incorporate the existing hydrants. Some of the variables that I have questions regarding are below:

1. Assume only one structure will have a fire demand. I imagine build separate models for each of the proposed hydrants?
2. Do I include all three existing hydrants in the model(s) and input their respective pump curves per their respective flow tests? Or do I include only one existing hydrant, and would this be the hydrant furthest from the new hydrants?

I have built models with three existing hydrants and only one existing hydrant, and the results are different (obviously). I am just not sure if the results can be considered acceptable, and I am hesitant to use them in my engineering report deliverable.

Any guidance on how to correctly build and model fire flows would be helpful!

Thanks to everyone in advance, and have a great weekend!

RE: Fire Hydrant Modeling in EPANET 2.0

Typically I would use the Flow Test nearest to your proposed hydrant(s), and use the curve from that test to simulate the existing system and its response to flow demand. If the two proposed hydrants are near each other and served by the same system, then you could keep them in the same model and just flow them independently for each analysis (with different demand patterns). I used the free add-on FireFlow from OptiWater to analyze available fire flow at each hydrant at minimum system pressure (typically 20 psi).

If the three flow tests are near each other and served by the same distribution system, same diameter mains, etc... then you should have seen similar results from all three. IF they are wildly different, then you may want to look for closed valves or something wrong with the system to cause that difference in results. If the differences are minor, then I would typically use the one closest to the proposed hydrants, or you could use the lowest results to be conservative.

A sketch of your distribution system would be helpful, and descriptions of any major elevation differences or water main size/types.

#

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close