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- since 1996 -
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Technical Discussions
Vicky
NDT Inspector, Blue Star Limited
IE , India, Joined May 2009, 29

Vicky

NDT Inspector, Blue Star Limited
IE ,
India,
Joined May 2009
29
10:35 Nov-20-2009
Hydrogen induced damages

Hello,
Can anyone tell me about Hydrogen induced damages their nature the way they develop and is their any technique that might detech the same.

 
 Reply 
 
Ingo
Engineering, NDT Inspector & Sales
ec-works GmbH, Germany, Joined Apr 2000, 30

Ingo

Engineering, NDT Inspector & Sales
ec-works GmbH,
Germany,
Joined Apr 2000
30
11:13 Nov-20-2009
Re: Hydrogen induced damages
In Reply to Vicky at 10:35 Nov-20-2009 (Opening).

Hi Vicky,

I'm not an HIC expert, but I know one real good NDT company which is specialized in HIC detection. You should go to "www.verkadendt.de" This is a Dutch / German company and they are real experts in UT HIC detection.

regards

Ingo

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
12:06 Nov-20-2009
Re: Hydrogen induced damages
In Reply to Ingo at 11:13 Nov-20-2009 .

API 571 Damage Mechanisms of fixed equipment in oil refineries, Section 5.1.2.3 Wet H2S damage includes HIC (stepwise cracking) formation mechanism, susceptible materials and operating condiitons with example photos.

Googling your subject reference gives many references as does searching on ndt.net
Detection is best with UT.

 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
17:14 Nov-20-2009
Re: Hydrogen induced damages
In Reply to Nigel Armstrong at 12:06 Nov-20-2009 .

And the best UT method is Phased array, scanning from 45 deg to 70 deg, either manually or using a positioner. I'd probably hand-scan.

 
 Reply 
 
luis ganhao
Engineering,
USA, Joined Sep 2008, 25

luis ganhao

Engineering,
USA,
Joined Sep 2008
25
18:16 Nov-20-2009
Re: Hydrogen induced damages
In Reply to Vicky at 10:35 Nov-20-2009 (Opening).

The best technique to detect and size HIC is TOFD and Corrosion Mapping, I have experience in detect this type of degradation in some vessels in PDVSA-Venezuela and my experience with both techniques was very accurate and fast.

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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
10:28 Nov-21-2009
Re: Hydrogen induced damages
In Reply to luis ganhao at 18:16 Nov-20-2009 .

I have to disagree that TOFD is the best way to examine for HIC. For a start you need to do an assessment as to which morphology is most likely plain HIC or SOHIC. SOHIC is much more complex and very often badly over called by TOFD. The best approach and please read NACE texts developed over many years is to employ a zero degree with 45 degree shear wave scanning at 180 degree orientation.
A similar comment applies to employing PA techniques unless you employ probes focussed in two directions you will certainly mis-size and possibly miss small instances of HIC.
One of the earlier posters referred to Verkade who in my more than 30 years of doing this is one of the best proponents of this examination anywhere in the world and he was doing this most successfully with manual techniques years before TOFD or PA was ever mentioned.
I cite an examination performed with TOFD calling gross HIC in pressure vessels which when inspected manually showed nothing. One vessel was removed from service and sectioned and sure enough no HIC.
Of course the really critical fcator as with any of the techniques is having samples containing HIC and SOHIC to train people whatever the technique.

 
 Reply 
 
Abbas Bombaywala
NDT Inspector
Free Lance, India, Joined Jul 2007, 92

Abbas Bombaywala

NDT Inspector
Free Lance,
India,
Joined Jul 2007
92
15:24 Nov-21-2009
Re: Hydrogen induced damages
In Reply to John O'Brien at 10:28 Nov-21-2009 .

I would suggest that if possible to carry out ToFD + PA and Back Scattering technique with 0 deg. The combination of this three techinques might gave u a clear picture about the cracking, As ToFD is very sensitve in the lower part of the test material it would give u an good indications from surface defects at the other end PA will be useful because u have range of angles so at any one of the angle u are going to hit the crack perpendicularly and which will give u the maximum amplitude, Back scattering is one more techinque which was used from the time before introduction of ToFD & Phassed Array, in this technique we scan the suspected area with backwall @ 80 fsh + 30 db and look for small peaks in front of back wall, Also one more to mention is Velcoity Ratio Measurments , if the suspected area be inspected with all this techniques then we have more clear picture about the HIC. I hope this might solve ur question

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
15:49 Nov-21-2009
Re: Hydrogen induced damages
In Reply to John O'Brien at 10:28 Nov-21-2009 .

As John suggests NACE literature is an excellent resource. As a starter may I suggest obtaining NACE RP0296 Wet H2S.

 
 Reply 
 

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