×
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

Standpipe Backwash

Standpipe Backwash

Standpipe Backwash

(OP)
I am having a real hard time wrapping my mind around this concept.  I am working with a filter manufacturer who likes to backwash with the use of a standpipe.  This is for an industrial waste water process where water is pumped from a wet well through the filters and back out to drain.  The backwash water is taken directly from a filter discharge and is sent through an adjacent filter in backwash mode.  

I've been on the phone with their engineer, but there is a communication gap.  My understanding of the concept is that there is an open standpipe on the discharge side of the filter bank.  The water level in the pipe is several feet higher than the top of the filters.  I am told that this insures enough head to backwash the filters (one at a time).  

Here's my problem, the only way to raise the water up in the standpipe is to pump it up there, right?  So if I have enough pump head to raise the water up, I have enough pump head to backwash the filters, right?  If that's true, then what do I need an open standpipe for?  It seems to me that the potential for disaster is great with an open pipe on the discharge side of the pump.  Wouldn't I be better off maintaining a pressure on the discharge side of the filters so that I will have enough to backwash?    

What am I missing here?  

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