Subsea piping installation

[amyped]

Dear All,

I have a job to install piping including with actuated valve at PLEM (Pipeline end manifold)which is located at seabed (80m depth from sea level) but I have no experience in subsea piping installation & testing.

Could you please give me suggestion or any information that you may have and sharing your experience to me? I would like to know about the technical and criteria of consideration. What I have to concern and so on?

It would be great if you have any reference technical data and give its to me.

Many Thanks,
amyped
contact me: amyped@hotmail.com

 

[sjohnr]

Generally, the same materials are used subsea as are used in surface applications, the main difference is in the external coating. You would need specialist advice on that.

Additionally, some form of cathodic protection may be required, this is usually implemented using sacrifical anodes, Impalloy make the ones we have used in the past.

The piping materials obviously need to cope with the product being transported (e.g. sour service).

 

[SJones]

For materials and corrosion issues, look at EEMUA 194. What design code are you working to?

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[amyped]

Dear Steve Jones & sjohnr,

Thanks for you advised.

The disign code is ASME B31.4.
Now I'm looking for the procedure to replace the piping spool & actuated valve at seabed. I'm quite not sure what I've to concern and how to do it. Could you please advise??

Best Regards,
amyped
Mechanical & Piping Engineer

 

[DrillerNic]

The best way to see how you replace the spool is to talk to a subsea engineering contractor: Subsea Seven, CSO, Stolt etc. They will be able to suggest whether you can pull the line to surface and to the work there and then reinstate the line (proabaly the simplest way to do it, but maybe not possible in 80m of water) or doing it subsea- is the spool welded or bolted? I hope it's bolted as hyperbaric welding is expensive....