×
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

Sea Water Intake Lines

Sea Water Intake Lines

Sea Water Intake Lines

(OP)
hi all, i'm mechanical engineer at bp operation in tangguh LNG, papua. i wanna ask a question about sea water intake line material, is it safe if we are using the GRE pipe,or I should use a super duplex material, and does anybody has an information about the price of super duplex material, thx

Bilal Adi Akbar
Mechanical Engineering Challenger
BP Tangguh Operation

RE: Sea Water Intake Lines

Size, diameter, design pressure, design temperature, buried, submerged, criticality, impact risk, etc etc?  Your first reference point might be ETP GP 36-10.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: Sea Water Intake Lines

I would look at options such as precast concrete and cement lined steel before I looked at super duplex.  The cost would be huge.
What diameter, length and pressure are you dealing with?

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Sea Water Intake Lines

(OP)
the diameters are 12" and 10" the operating pressure is 25 kg/cm2 and the existing line is using CS cement lined, after 2 years operation there were some leakages at the pipe fittings, it was suspected due to cement bonding quality.the pipe length is about 10 m long, and it's the discharge line of the sea water pump  

Bilal Adi Akbar
Mechanical Engineering Challenger
BP Tangguh Operation

RE: Sea Water Intake Lines

But you need to know the seawater temperature before diving into super duplex!

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: Sea Water Intake Lines

(OP)
ooo yes,sorry i forgot, the temperature of the sea water is about 30 celcius

Bilal Adi Akbar
Mechanical Engineering Challenger
BP Tangguh Operation

RE: Sea Water Intake Lines

SJones

In my experience 30°C is the limit for the application of Superduplex (PREN >40) in seawater.

S

Corrosion Control
 

RE: Sea Water Intake Lines

(OP)
well, after i read in many literature, especially in ETP GP,i have decided to change it with super duplex,now does anybody has the info about the price of super duplex S32760?thx before

Bilal Adi Akbar
Mechanical Engineering Challenger
BP Tangguh Operation

RE: Sea Water Intake Lines

Steve

It was not a lucky guess but just a simple suggestion based on the assumption that if the service is a Sea Water Intake Lines then the operating temperature should be quite "low"...
and as i said it was just a suggestion not a material selection report..

have a nice and lucky day

S
 

Corrosion Control
 

RE: Sea Water Intake Lines

Vitt,

My point was:  a recommendation without knowing the service conditions is a lucky shot.  Tangguh is in tropical waters and will be very close to the generally adopted limit for super duplex.  In all probability, the seawater may, on occasion, exceed 30 deg C.  

Best to get complete data before making firm recommendations.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: Sea Water Intake Lines

Steve,

Experience is something that is not possible to teach.. You're right, i didn't think that in some areas of the world the  seawater temperature can reach that values...

thanks for your help

all the best

Vitt



 

Corrosion Control
 

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