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


Submerged Seawater Lift Pump Elevation (below sea level)

Submerged Seawater Lift Pump Elevation (below sea level)

Submerged Seawater Lift Pump Elevation (below sea level)

I need to design a submerged seawater lift pump.
Can anyone tell me what should be a general "margins" for the lift pump bottom? I have the following design steps as below:

a. Find the lowest sea trough (in this case it is -9m)
b. Find the SW Lift Pump length (estimated 2m in this case)
c. Find the required NPSHr (assumed 2-4m in this case)
d. Find the pressure loss for SW lift pump inlet strainer (assumed 1m)
e. Find the pressure loss due to the SW lift pump caisson (assumed 1m)
f. Based on calculations, NPSHa is 20m which is more than NPSHr.

If I add up the above I have total required elevation of: 9 + 2 = 11m
I know we also need to find out the corresponding Seawater temperature at that elevation if it is suitable for our topsides cooling requirements. Let's simplified it here as this is a shallow water platform hence the SW temperature is not changing so much with elevation.

Can I then select the SW lift pump to be located at -11 or -12m?
I would like to know if I miss something 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!


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