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 -

GB Inspection Systems Ltd.
A leading UK manufacturer of Ultrasonic Probes, Accessories, Supplier of NDT Equipment and more.
1721 views
Technical Discussions
samit
samit
12:51 Dec-20-2009
pipe surface crack
zoom image

Please check the attach pic 47 and 53, as asked for pic. Please give your comments. Note that this is a seam less pipe of 9.5mm thick.Although these cracks are visible visually, they are only in surface(no depth, allmost less than 1mm).
In pic. 45, the two lines are crack? Look like a seam in a seam less pipe?

Please provide your experience and knowladge about these.

    
 
 Reply 
 
aldo
Engineering
Italy, Joined Jan 2009, 39

aldo

Engineering
Italy,
Joined Jan 2009
39
15:45 Dec-20-2009
Re: pipe surface crack
In Reply to samit at 12:51 Dec-20-2009 (Opening).

can be a stupid question that i make to you: which NDT methods has been used for this tube?

    
 
 Reply 
 
Andreas
NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh, Germany, Joined Oct 1999, 129

Andreas

NDT Inspector, Specially in the oilfield
Tuboscope Vetco(Deutschland)Gmbh,
Germany,
Joined Oct 1999
129
16:21 Dec-20-2009
Re: pipe surface crack
In Reply to samit at 12:51 Dec-20-2009 (Opening).

Only the middle picture is clear ,thr other to picture looks out off focus.
The 2 line are most properly a false indication ,looks like mechanical scraches from the mill.
In a seamless pipe when new you will find most of the longitudial orientated defects like seams and three dimensional like overlaps and roll ins.

Regards

Andreas

    
 
 Reply 
 
Phil
NDT Inspector, Radiation Safety
BINDT, MIAQP, United Kingdom, Joined Mar 2009, 151

Phil

NDT Inspector, Radiation Safety
BINDT, MIAQP,
United Kingdom,
Joined Mar 2009
151
10:23 Dec-22-2009
Re: pipe surface crack
In Reply to aldo at 15:45 Dec-20-2009 .

Hi Samit,

The middle picture looks like you have carried out MT on the pipe is that correct.

As the first picture is a little blurred, but looks like it could be mill marks but not being able to see them properly can not comment further.

Regards,

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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
13:05 Dec-24-2009
Re: pipe surface crack
In Reply to Phil at 10:23 Dec-22-2009 .

The indications seem too regular to be anything other than mechanical.
Have you done any PMI across the area to look at chemical changes, also polish and etch for microstructure. Its possible depending upon where and when the pipe was bought its not really seamless and was long seam welded and ground (has occurred in past). Possible that there was a QC problem and the area has been mechanically worked leaving longitudnal roll marks.
You need to go back to the original pipe specs including the actual addition to see if these were detected at the mill and called mechanical marks rather than cracks if they would have been acceptable.

    
 
 Reply 
 

Product Spotlight

MUSE Mobile Ultrasonic Equipment

The MUSE, a portable ultrasonic imaging system, was developed for in-field inspections of light-weig
...
ht structures. The MUSE consists of a motor-driven manipulator, a water circulation system for the acoustic coupling and a portable ultrasonic flaw detector (USPC 3010). The MUSE provides images of internal defects (A-, B-,C- and D-scan).
>

Cygnus 6+ PRO Multi-Mode Ultrasonic Thickness Gauge

The Cygnus 6+ PRO thickness gauge is the most advance gauge within the Cygnus range with key featu
...
res including: comprehensive data logging; A-scan and B-scan display; manual gain control; Bluetooth connectivity; and much more. With its unique dual display and three measuring modes (Multiple-Echo, Echo-Echo and Single-Echo), this surface thickness gauge offers maximum versatility for inspections.
>

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

HARDNESS TESTER TKM-459CE combi

TKM-459CE combi applies 2 methods of hardness control: UCI and Leeb. It provides high-accuracy tes
...
ting of metals and alloys as well as items of different sizes and configurations, their hardened layers and galvanic coatings. Device represents results in HB, HRC, HV and others. Shock-, dust- and water-proof housing with intuitive software make this gauge easy to use in all working conditions.
>

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