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Technical Discussions
kutty
kutty
05:33 May-31-2009
Dent in a pipeline

Is there any limit on dent in a pipeline(flow line)?

    
 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
14:06 May-31-2009
Re: Dent in a pipeline
In Reply to kutty at 05:33 May-31-2009 (Opening).

All dents that affect the curvature of the pipe at the longitudinal weld or any cicumferential weld shall be removed.
All dents that exceed a maximum depth of 1/4" in pipe NPS 12 shall not be permitted in pipelines or mains intended to operate at hoop stress levels of 40% or more of the specified minimum yield strength.
When dents are removed, the damaged portion of the pipe shall be cut out as a cylinder.
Insert patching and pounding out of the dents is prohibited.

    
 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
18:11 May-31-2009
Re: Dent in a pipeline
In Reply to kutty at 05:33 May-31-2009 (Opening).

How you manage a dent in a pipeline can vary temendously based on the actual dent and the location and/or service of the pipeline. Your regulatory regime may also dictate what you have to do.

You should consider a fitness for service approach and there are methodologies available though the PDAM (Pipeline Damage Assessment Manual Group), Pipelien Research Council International (PRCI) and many other published works such as kiefner et al.

    
 
 Reply 
 
Juan Bermúdez
Juan Bermúdez
18:16 Sep-21-2011
Re: Dent in a pipeline
In Reply to kutty at 05:33 May-31-2009 (Opening).

Hello,

How I can obtain dent curvature through depth and lenght of a dent?

    
 
 Reply 
 

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