NDT method for detecting tight cracks

kareem.021181 · **Posted:** Sat Feb 06, 2010 10:04 pm

which is the best NDT method for detecting a tight crack (Stress corrosion cracking) on the HAZ of the bottom plate of inservice tank ?.

Material SS304L,thick 6mm plate.

DPT was not sucessful.

leem817 · **Posted:** Mon Feb 08, 2010 8:02 pm

best NDT method for detecting a tight crack

Have you tried Phased Array UT or any UT method will work on tight crack.

Good luck,

leem

sooeey2u · **Posted:** Tue Nov 09, 2010 7:52 pm

leeme is right about UT.

Another method of detecting tight cracks in HAZ might be MT if the material if ferrous.

To detect minute cracks I have even sprayed PT developer on the area to be examined and it really enhances the red particles when using AC yoke continuous method MT.

Best of luck to you,
Robert P.

Gonzaga · **Joined:** Sat Dec 15, 2001 1:00 am **Posts:** 610

leem817 wrote:

best NDT method for detecting a tight crack

Have you tried Phased Array UT or any UT method will work on tight crack.

Good luck,

leem

On a 6 mm thk.??
Mauro

Inspectengr · **Joined:** Thu Oct 28, 2010 11:09 am **Posts:** 2

If applicable u can use PiNPOiNT Colormetric Leak Testing as per
"Ammonia Developer Standard Test Method for Ammonia Colorimetric Leak Testing"
ASTM E1066

These are a very effective in case of Stainless steel, if u are able to fill ammonia / nitrogen mixture gas at one side. we effectively use in Urea Reactor.

Best of luck

dukenukemQA · **Joined:** Fri Sep 16, 2011 2:43 am **Posts:** 4

Type I liquid pentrant would be the most sensitive for detecting tight cracks open to the surface. I am not very familiar with it but I know alot of tank floors are inservice inspected using Magnetic flux leakage. If type I liquid pentrant cant find it nothing can,

NDT method for detecting tight cracks

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