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 -

2059 views
Technical Discussions
Paul Robertson
,
Netherlands, Joined Jun 2003, 12

Paul Robertson

,
Netherlands,
Joined Jun 2003
12
02:41 Oct-23-2007
Tank Floor Inspections

I'd like to get some views from the forum and their opinions/experiences regarding MFE/MFL versus LFET tank floor inspections and related level of confidence/cost factor.
Be good to hear from you.

Paul Robertson.


 
 Reply 
 
Andre van Vuuren
Andre van Vuuren
03:52 Oct-24-2007
Re: Tank Floor Inspections
I think SLOFEC should also be mentioned. Its an eddy current technique that can differentiate between top & bottom side corrosion through a coating. Check out www.innospection.com

----------- Start Original Message -----------
: I'd like to get some views from the forum and their opinions/experiences regarding MFE/MFL versus LFET tank floor inspections and related level of confidence/cost factor.
: Be good to hear from you.
: Paul Robertson.
------------ End Original Message ------------




 
 Reply 
 
Geert Bontekoe
Geert Bontekoe
04:21 Oct-24-2007
Re: Tank Floor Inspections
To make a good estimate of the different systems, you should include the INTANK system. It uses the UT technique for the floor inspection. The mayor difference is that it can do the inspection WITH PRODUCT in the tank. This has some mayor advances like; no need to move the product, no cleaning needed, less or no sludge to be removed/processed, safety(no people needed to work in the tank), lower emmissions of vapors.


For more information visit techcorr.com

regards Geert


----------- Start Original Message -----------
: I'd like to get some views from the forum and their opinions/experiences regarding MFE/MFL versus LFET tank floor inspections and related level of confidence/cost factor.
: Be good to hear from you.
: Paul Robertson.
------------ End Original Message ------------




 
 Reply 
 
Floyd Atkinson
NDT Inspector
American Inspection Society, Inc., USA, Joined Jun 2004, 10

Floyd Atkinson

NDT Inspector
American Inspection Society, Inc.,
USA,
Joined Jun 2004
10
05:49 Oct-25-2007
Re: Tank Floor Inspections

When you get to doing vacuum box inspection on tank floor section welds let me know. Been there done that. It can be inexpensive and a two man crew can do a tank in fast time. The second man is to hold the explosion proof flash light and keep the air hose out of the way. Corner welds no problem if you have a 90 degree vacuum box configuration.

Good luck.

----------- Start Original Message -----------
: I'd like to get some views from the forum and their opinions/experiences regarding MFE/MFL versus LFET tank floor inspections and related level of confidence/cost factor.
: Be good to hear from you.
: Paul Robertson.
------------ End Original Message ------------




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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
01:49 Oct-29-2007
Re: Tank Floor Inspections
----------- Start Original Message -----------
: I'd like to get some views from the forum and their opinions/experiences regarding MFE/MFL versus LFET tank floor inspections and related level of confidence/cost factor.
: Be good to hear from you.
: Paul Robertson.
------------ End Original Message ------------
Paul

its a question that is never ending. A number of oil companies ran a round robin evaluation of various scanner technologies, contractors with the same technology and operators with the same scanners. I believe that the results of this was not so much the difference between the technologies but the way they are operated in terms of competancy and prove up. It was clear you can take any MFL scanner with a good company and good operator and get excellent results. You give the scanner to a different less expereinced operator and the results decline dramatically. the same applies to LFET, SLOFEC, InTank etc etc.

You need to prove up indications with UT and that part of the trials produced even less confidence than the floor scanners. API has just held a pilot of the UT plate thickness prove up UT test and the results confirm other performance demonstration tests that approx 60%+ of manual UT thickness technicians cannot pass a thickness test where accuracy is set at +/- 0.050" just over 1 mm on a 6 mm plate.

These results are what led to API 653 developing Appendix G which outlines an approach for test operators performing tank bottom evaluations. The API committee is currently reviewing this Appendix to add additional information on testing and qualifying UT prove up technicians.

if you want to idnetify the good contractors set up an Appendix G test. On one I ran 21 companies applied and we ended up with 3 who achieved an acceptable standard. Note you need to test on old plate with real wall loss. new plate and machined flaws proves absoloutely nothing other than that the scanner works.

Based on all this therefore its not the technology that is the most critical item but procedures, methods, training and experience that leads to good results.

On a cost basis getting the best people always costs more so the cheaper the examination the less likely you are to get good results.



 
 Reply 
 

Product Spotlight

ISONIC 3510

Very Powerful Superior Performance Extremely Portable Smart Phased Array Ultrasonic Flaw Detector an
...
d Recorder with 2 Conventional UT and TOFD Channels uniquely combines PA, single- and multi-channel conventional UT, and TOFD modalities providing 100% raw data recording and imaging. Suitable for all kinds of every-day ultrasonic inspections
>

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.
>

FMC/TFM

Next generation for Phased Array UT is here now with FMC/TFM! Have higher resolution imaging, impr
...
oved signal to noise ratio, characterize, size and analyze defects better with access to several wave mode views and save raw FMC data for higher quality analysis.  Some of the benefits are:
  • Beautiful Image! Easier to understand what you're looking at
  • Completely focused in entire image or volume
  • Much easier to define setups before inspection
  • Easier to decipher geometry echoes from real defects
  • Oriented defects (e.g. cracks) are imaged better
  • See image from different wave modes from one FMC inspection
  • FMC data can be reprocessed/analyzed without going back to the field
>

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
>

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