×
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

Double suction pumps piping

Double suction pumps piping

Double suction pumps piping

(OP)
I'm routing 12" or larger piping to (2) double suction pumps with 10" nozzle and a top/top configurations.  I also have control valve, basket strainer and the block valves immediately upstream of the suction nozzle and running the suction piping perpendicular to the pump shaft centerline.

However, I cannot stack the piping components because of the piping configuration (vessel nozzle height, control valve access, etc.).

I need place an elbow right before the pump suction so that I can run my piping.  So, would I also need to provide a 5-10 diameter straight run prior to the elbow?

Would it be better to place the reducer on the vertical run then place the elbow or place the elbow first, then install the reducer on the horizontal run?
 

RE: Double suction pumps piping

Running the suction piping perpendicular to the pump shaft center line your options (Starting from the Pump suction and working back upstream):
A). Place the reducer on the vertical run then place the elbow as in 10" Flange, 12 x 10" Concentric Reducer then 12" elbow.

or

B). Place the elbow first, then install the reducer on the horizontal run as in  10" flange, 10" elbow then a 12" x 10" Eccentric Reducer

I would go with option "A".
 

RE: Double suction pumps piping

I also prefer the reducer in the vertical run.  I am curious why you have a control valve in the suction line.  This is generally not a good idea.  If you must regulate the flow, it should be done on the discharge only.  

In our standards, we would require a minimum 5 pipe diameters (preferred 10 diameters) straight run between the pump and the elbow.  Starting at the pump, it would be concentric reducer, straight pipe, elbow, strainer, valves.  
 

Johnny Pellin

RE: Double suction pumps piping

Suggest you get a copy of ANSI/HI 9.8 or the book pumping station design by sanks.

"Sharing knowledge is the way to immortality"
His Holiness the Dalai Lama.

http://waterhammer.hopout.com.au/

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