×
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

Inland Underwater Pipe Installation

Inland Underwater Pipe Installation

Inland Underwater Pipe Installation

(OP)
I am working on a budgetary cost estimate (apx 30%). I have to deliver 250 cfs of water out of a river appx 3 miles to the toe of a dam where it will attach to and outlet from the downstream side of the dam through a sluice pipe. About 2 miles is under about 100 feet of water in a long, narrow reservoir, located off Hwy 70 (a long windy road) in the Sierra Nevada mountain range (CA).

I would like to know what equipment (along with mobilization and construction costs) will be necessary to lay the pipe on the bottom, which will require some dredging to keep a consistant slope for gravity flow. There is about 100 feet of head.

Thanks.

RE: Inland Underwater Pipe Installation

Clam-shell bucket with barge mounted crane,($2500/day plus mobe).

RE: Inland Underwater Pipe Installation

Re "pipe on the bottom, which will require some dredging to keep a consistant slope for gravity flow."

You don't need a constant slope for gravity flow. Can go up & down by siphon effect (as long as no significant leaks).
The section of the LA Aqueduct, completed ca. 1913 (some work continued to 1916):
 

'The south end of the Jawbone Siphon, an 8,095 foot steel pressure siphon.'

RE: Inland Underwater Pipe Installation

Kenvlach
On land air release valves are placed at high points. They are not normally used underwater due to maintenance considerations. Therefore it is advisable to have a fall, albeit not constant, underwater.

UConDoIt
Use a HDPE pipe with concrete weight collars, which can be launched as it is welded together and then installed by the S-Lay or Float Flood method. Being in a reservoir you will not need very big collars as the wave forces are low.

Stephen Argles
Land & Marine
www.landandmarine.com

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