×
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

Seawater Intake

Seawater Intake

Seawater Intake

(OP)
Does anybody knows why the designer of this intake, decided to have a above-ground discharge for seawater pumps, first, and then let them going U/G after some meters?
Let consider it in another way. If the outlet run U/G from the begining, then we have shorter pump, and therefore less material for it (cheaper pumps).
FYI i download the picture by googling.

RE: Seawater Intake

this is a typical installation and makes it much easier for maintenance of the pumps, motors, valves and gauges on the discharge line. Also keeps the motors up higher which helps to protect them from flooding. May also reduce the depth of the pump cans. Size of the pumps would not change. Assuming you do not want your electric motor below ground in a vault but prefer it above ground, then the drive shaft would be much longer and that would result in a more expensive pump.

RE: Seawater Intake

(OP)
Thank you cvg for your reply.
Let see it from this point of view.if take a look to the picture again it seems the piping is not CS. it resembles more to the HDPE (or GRP), which is weak in shear comparing to the CS. in this regard i think settlement of concrete intake is main reason to have A/G discharge to avoide direct shear in piping, and change it to tension and comopression at some meters away.Am i right?  

RE: Seawater Intake

I serously doubt this is HDPE. If I had to guess, I would say this is either steel or ductile, but probably steel. I would never recommend HDPE pipe in an above ground pump discharge header and for multiple reasons not counting shear or bending strength of the pipes. I have not used GRP for pressure applications so cannot comment on the suitability of that particular type of pipe in this application. I would hope that the design accounted for settlement.

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