×
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

pipe roll

pipe roll

pipe roll

(OP)
Hello,
I would like to get some information about pipe roll (rotation of the pipeline when installed subsea) and the ways to prevent it when installing tees or valves.

Regards,

 

RE: pipe roll

In what manner?  What exactly are you doing?

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

RE: pipe roll

(OP)
Hello,

Actually I would like to know the ways used in industry to stop this happening.

Regards,
 

RE: pipe roll

Ya I'm sure, but there might be different ways to avoid it, depending on what you're doin' out there.

Are you towing out, lowering in... cutting into existing ?????

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

RE: pipe roll

(OP)
Hello,
Actually, I am interested in the ways of stopping it during deep S-lay installation.
 
Regards,

RE: pipe roll

(OP)
Well this is a phenomenon which happened as the pipeline tries to minimise the work done due to the reverse bending at the sag bend.This cases problems when installing valves and tees as it change the orientation

 

RE: pipe roll

Interesting.  Is anybody trying to that now?

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

RE: pipe roll

(OP)
trying what?

RE: pipe roll

Don't they just allow them to roll and then use special flange to connect them together?

RE: pipe roll

Thats why Swivels are used!!

Siddharth
These are my personal views/opinions and not of my employer's.

RE: pipe roll

Humm.... you both mean Swivel Flanges, I presume.

But those are for the connection, not trying to control it during laying.  I think that's what S0606 is aftera.  I don't know if anyone is trying to control it during laying, except by holding tension and not letting it overbend too much.

 

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

RE: pipe roll

"This cases problems when installing valves and tees as it change the orientation"

BigInch,
Yes  meant Swivel flanges. I cant get what exactly S0606 is looking for!

Siddharth
These are my personal views/opinions and not of my employer's.

RE: pipe roll

Seems nobody get's it... so far.

I've always included a misalignment fitting "ball-socket type" in my tie-ins.  It accepts a few degrees angular misalignment and rotates to any angle to match flange bolt holes, but that's for tie-ins, not during laying.

 

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

RE: pipe roll

(OP)
Thanks for you comment but what I am looking for is controlling during the laying process not at the tie-in. Actually, there are ways to do this such as attaching a bouncy tanks to valves to stop it roll and stay in the right direction.
I am looking for more information on the subject of rectifying this problem
 
 

RE: pipe roll


 I have seen flotation sections attached to the upper section of the pipe as it is being runout, this keeps it orientated.  

Offshore Engineering&Design

RE: pipe roll

I am assuming he has appurtanences (sp?) on the pipe, such as inline tees, valves, plets etc which cause the pipe to become 'unbalanced' when laid.  

RE: pipe roll

Isn't it easier to lay the pipes, then come back, and lower in and connect tie-in assemblies?  We never did a layoff with a valve rolling down a stinger and that was in what I'm sure must have been much shallower water than is typical these days.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain

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