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 -
907 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

Varex Imaging Large Field of View (FOV) Digital Detector Arrays (DDAs)

A larger FOV DDA can reduce the space and volume of the X-ray inspection system on the factory floor
...
, enable faster scanning times, better throughput and better resolution images at a lower dose. Customers can also save time and money. With these benefits in mind, Varex Imaging has designed a family of large FOV detectors (4343HE, XRD 1611, 4343DX-I, 4343CT) for our industrial imaging customers.
>

32:128PR PAUT & 2-ch TOFD Flaw Detector: SyncScan 2

●32:128PR PAUT with optional 2-ch TOFD to maximize your efficiency ●Support PR mode for corrosi
...
on inspection ●Multiple solutions for welds & corrosion ●Faster scan speed (Approximately 3 meters/minute) ●Light weight: 4kg only including battery
>

New PHAsis module for longitudinal weld seam inspection

PHAsis® Phased Array manual ultrasonic spot weld inspection device is now ideally suited for test
...
ing of longitudinally welded seams (e.g. Arplas® seam, short line seams) with a length of 3 to 12 mm.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

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