where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

Phoenix Inspection Systems Limited
Design and manufacture ultrasonic Transducers, Scanners and Custom Solutions for NDT inspections. Innovators in NDT technology
1141 views
Technical Discussions
daniel
daniel
00:16 May-21-2006
inspection methodes for pipe line has been working over pressure

hello
i need information how to inspect a line that was subject for short period by over pressure around 3500 psi - 6" schedule 80 -flange rate 600
thanks


 
 Reply 
 
Rich Roberts (Quest TruTec)
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Rich Roberts (Quest TruTec)

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
08:10 May-22-2006
Re: inspection methodes for pipe line has been working over pressure
Good Day,

You may want to consider applying the "ultrasonic" based FTIS Intelligent Pigging technology. The FTIS system can clearly detect and quantify damages such as: Bulging, Swelling, Ovality in addition to Corrosion, Erosion & Pitting.

Regards, Rich Roberts
Quest TruTec




 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
01:14 May-23-2006
Re: inspection methodes for pipe line has been working over pressure
On a rough calculation you have exceeded maximum allowable pressures on both pipe and flanges by a factor of 2.

You do not indicate how long the over pressurisation was for or what the current working pressure is. You also do not indicate temperature and fluid service and whether the pipe is aboveground or buried.

You need to consider a risk assessment looking at all these factors plus was this a one time deal or have you been cycling the piping system.

Consider likelihood and consequences of failure, impact on operations, environment etc.

First is a visual to look for visible signs of damage, leaking flanges, loose bolts, deformation, misalignment, stressed pipe supports etc. API RP 574 can be used for guidance.

If this first go around looks good then you may have mitigated your risk of an immediate release.

Then consider long term operation, how long, what pressure, fluid service, future pressure excursions.

If there remains a high concern then you may need to proceed to the approach suggested by Rich Roberts or it may be more cost eefective to schedule a replacement.




 
 Reply 
 
Robert Davis
Robert Davis
08:46 May-29-2006
Re: inspection methodes for pipe line has been working over pressure
Please be clear, is this a design pressure or operating pressure. Even if design let's back out of the analysis and look at the uncertianty with the stress. Then look at the actual design numbers, generally you will find that you never went above yeild. OK once this has been looked at, now find a reference for the creep properties. Using the NDE results for maximum flaw size apply the flaw diameter and determine the Kic.

RBD


 
 Reply 
 

Product Spotlight

HD-CR 35 NDT Computed Radiography System

Portable high-resolution CR scanner for all radiography applications - weld testing, profile images
...
and aerospace. No matter what type of radiographic testing you are performing, the unique TreFoc Technology of the HD-CR 35 NDT imaging plate scanner always guarantees the highest image quality.
>

FAAST-PA! OEM Patented phased Array for high speed UT inspection

Multiangle, Multifocus, Multifrequency, Multibeam. Instead of stacking UT electronics and having m
...
any PA probes, FAAST-PA is able to transmit all delay laws within ONE single shot in Real time.
>

Research and Applications Development For NDT

The Research and Applications Development (RAD) group is a newly formed team within Acuren dedicat
...
ed to tackling challenging inspection problems. Our focus is the development of novel, field deployable, advanced inspection techniques for use in cases where standard NDT methods are ineffective. We don't wait for new innovations, we engineer them. From concept to commissioning.
>

TraiNDE UT

TraiNDE UT is a virtual tool associated with a signal database which simulates real inspection con
...
ditions for numerous applications (Type A/V1 block, DAC block, welds and plates).
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window