×
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

Pump Design -Help

Pump Design -Help

Pump Design -Help

(OP)
I am trying to design a small pump for a set of condos (3-storey. I have been given the flow test on the water system in the area. Residual- 35psi, Static - 55psi pitot of 1500gpm. I mean there is alot of water in the area but the pressures are just not enough to meet 20psi for 1000gpm for fire flows. There is a total of 50 units.

Could anyone help with sizing the pump. I did the waterCAD analysis for the development but was having negative pressures at a fire hydrant I placed in the development.

Thanks

RE: Pump Design -Help

Get a set of candidate pump curves and put a pump into your WaterCAD model. When you find one that works correctly, take it to someone with experience to check your model and calculations.

RE: Pump Design -Help

I may not be understanding you correctly but did you say there was a residual pressure of 35 psi @ 1,500 gpm flow.  That is more than 1,000 gpm @ 20 psi.  

RE: Pump Design -Help

before you get too carried away, try and get another fireflow test and do it closer to your site.  It's not unusual to see variations from one test to another and you may be surprised to find out you have more pressure than you thought.  Then try bumping up the size of your fire line connection to the watermain. Use at least 8 inch and if it is a very long run, try 10.

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