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 -
841 views
Technical Discussions
RP Bhan
Engineering,
HPCL Refinery, India, Joined Jul 2003, 11

RP Bhan

Engineering,
HPCL Refinery,
India,
Joined Jul 2003
11
01:41 Sep-20-2003
NDT for checking under insulation corrosion

Can I know which technique is most reliable & established for checking corrosion under insulation for pipelines ,


 
 Reply 
 
Robert Nottoli
Robert Nottoli
08:23 Sep-22-2003
Re: NDT for checking under insulation corrosion
----------- Start Original Message -----------
: Can I know which technique is most reliable & established for checking corrosion under insulation for pipelines ,
------------ End Original Message ------------
Please look at the two sites listed and respond with questions.





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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
09:52 Sep-22-2003
Re: NDT for checking under insulation corrosion
There are a number of techniques with varying degrees of success/cost/benefit

Small Bore Piping the LIXI profiler is a relatively low cost and simple device.
4" and above Guided Wave Ultrasonics is a suitable technique at medium cost but requires removal of a 12" band of insulation at typically 40 Metre intervals.
Flash radiography is a low cost technique but may have poor resolution.
Digital Radiography is a higher cost option but does have good resolution with no disturbance of insulation.

First option is to conducte a good visual and susceptibility assessment in line with API 570 guidance.


 
 Reply 
 
Kåre Johansson
Kåre Johansson
08:42 Sep-23-2003
Re: NDT for checking under insulation corrosion
----------- Start Original Message -----------
: : Can I know which technique is most reliable & established for checking corrosion under insulation for pipelines ,
: Please look at the two sites listed and respond with questions.
------------ End Original Message ------------

There is only one sure way: remove the insulation and do visual inspection.

All other techniques have their limitations which the suppliers don't usually tell you till afterwards. Guided ultrasonic can work well on 2" pipe (we have reached 60m under perfect conditions)but usually have problems due to interference from supports and branches. INCOtest can work on larger diameter pipes under some circumstances, and not others. Neutron radiography can detect wet insulation.

Whatever you decide to do: verify the results by stripping.
Regards
Kåre Johansson

We have tried several of the techniques mentioned, but the only one that has given us confidence so far is stripping insulation.


 
 Reply 
 
mohamed kream
mohamed kream
00:16 Nov-26-2004
Re: NDT for checking under insulation corrosion
----------- Start Original Message -----------
: : : Can I know which technique is most reliable & established for checking corrosion under insulation for pipelines ,
: : Please look at the two sites listed and respond with questions.
: There is only one sure way: remove the insulation and do visual inspection.
: All other techniques have their limitations which the suppliers don't usually tell you till afterwards. Guided ultrasonic can work well on 2" pipe (we have reached 60m under perfect conditions)but usually have problems due to interference from supports and branches. INCOtest can work on larger diameter pipes under some circumstances, and not others. Neutron radiography can detect wet insulation.
: Whatever you decide to do: verify the results by stripping.
: Regards
: Kåre Johansson
: We have tried several of the techniques mentioned, but the only one that has given us confidence so far is stripping insulation.
------------ End Original Message ------------




 
 Reply 
 

Product Spotlight

NDT Master Lecturer

In the program both university professors and practitioners will give lectures, which guarantees the
...
oretical depth and practical inside. Academic Director: Prof. Dr. Christian Boller
The following lecturers are not complete: Prof. Tadeusz Stepinski, Prof. Wieslaw Staszewski, Prof. Frank Walther, Prof. Giovanni Bruno, Prof. Gerd Dobmann, Prof. Philippe Guy
>

NovaScope 6000

The all-digital Novascope 6000 is a portable, ultra-high precision thickness gauge for high-speed
...
thickness measurement. Novascope 6000 has unmatched capabilities and unique features including: •Superior Resolution with high contrast, high-speed color RF display •High pulser voltage •Real-time video output •Increased internal/external data storage •Programmable SetUp features •Battery & AC Powered
>

GUL QSR1® Scanning

How do you measure pipe wall thickness without direct access to the area? QSR® Scanning - Guide Wav
...
e Quantitative Short Range Scanning.
>

Aerospace Systems - Automated Ultrasonic Inspection

USL are specialists in the design and manufacture of turnkey ultrasonic inspection systems for aer
...
ospace applications. From monolithic composites to complex honeycomb structures. This video shows just a few examples of what is possible, find out more at: www.ultrasonic-sciences.co.uk
>

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