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 -

1287 views
Technical Discussions
krish
krish
12:07 May-06-2009
Acoustic emission testing of HIC affected pressure vessel

I would like to have the expert opinion about real time monitoring of Hydrogen Induced Cracking in a glass flake lined pressure vessel using Acoustic Emission Testing if condition favours to use the technique. Is it possible to detect step wise cracking & blister growth?

regards,

 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
17:08 May-06-2009
Re: Acoustic emission testing of HIC affected pressure vessel
In Reply to krish at 12:07 May-06-2009 (Opening).

Interesting question. I am no expert in this field, but what I understand is that Acoustic Emission listens to corrosion activity and hence translates to possible loss of metal or even leaks.
Its also interesting to know about Hydrogen Induced Cracking which normally happens in a non coated pressure vessel and how this can happen in a glass flake lined vessel.
For step wise cracking & blister growth, Ultrasonics would still be the best detection and monitoring procedure, and surely I would also like to know more of whether AE is also capable of doing this

 
 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
23:23 May-06-2009
Re: Acoustic emission testing of HIC affected pressure vessel
In Reply to bob sudharmin at 17:08 May-06-2009 .

I'm a 'user', not a subject expert.

Blister growth = Maybe

Stepwise, or any other crack propagation = Absolutely! This assumes that it is possible to stress the vessel, by pressuring it up to a psi at least 10% about the highest it has seen in the last year or so.

20 or 40% above the last highest pressure used at will give much better results. What you are doing is listening for flaws to propagate under the increased stress. The more [safe] stress, the better, and the smaller defects that can be identified.

 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 281

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
281
21:31 May-07-2009
Re: Acoustic emission testing of HIC affected pressure vessel
In Reply to Roger Duwe at 23:23 May-06-2009 .

There was a report on work I think published by NACE a number of years ago that looked at the ability of AE to detect activity from HIC. Basically any propogation of the blister towards a step or the step cracks themselves will generate AE. Since then a number of people have monitored vessels with some success. A large amount of the hydrocarbon industry vessel population is made for SA 516 Grade 70 and this is a 'quiet' steel so density and placement of sensors can be crucial. Be aware that permenet moniroing may be more effective for results than 'intervention' testing by raising pressure.

Interetsing that this is an internally lined vessel and you still have HIC. Since you presumably have access to teh external surface I would still wonder why you are not AUT mapping the affected area or is your suspected hydrogen charging rate so high you fear rapid propogation.

 
 Reply 
 
krish
krish
10:13 May-08-2009
Re: Acoustic emission testing of HIC affected pressure vessel
In Reply to John O'Brien at 21:31 May-07-2009 .

Thanks john and other for the expert comments.We did AUT scan and TOFD and found laminar type of indication at the mid wall of the plate close to the L-Seam/C-Seam welds.Originally the vesseal was coated with Coal Tar epoxy and latter it was upgraded with Glass flake vinyl ester.Thro AE we want to ensure whether the existing lamination/dense inclusion at the mid wall is growing or not in service.There is a possibility that it could be pre-existing manufacturing defect and hence it is operating under moderate H2S environment that we feels that the defective site will favor for hic to initiate.

 
 Reply 
 

Product Spotlight

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

Magnetic X-Ray Pipeline Crawler 6''-60''

Suitable to work in 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometer
...
s and provide the efficient inspection of the pipeline.
>

Scatter Correction for Industrial Cone-Beam Computed Tomography (CBCT)

Download our white paper on Scatter Correction for Industrial Cone-Beam Computed Tomography (CBCT)
...
Using 3D VSHARP, a fast GPU-Based Linear Boltzmann Transport Equation Solver here: http://bit.ly/2Y0t78P
>

Combination of Digital Image Correlation and Thermographic Measurements

The combination of measuring results from the digital image correlation (ARAMIS, DIC) and temperat
...
ure measuring data from infrared cameras permits the simultaneous analysis of the thermal and mechanical behavior of test specimens in the materials and components testing field.
>

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