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Technical Discussions
Boy Jurong
Boy Jurong
00:26 Jul-12-2007
NDT of stainless steel pipes

Hi all,
I'm evaluating a series of stainless steel pipes and is wondering what are the practicle evaluation method (NDE) to assess pitting corrosion and stress corrosion cracking in S/S pipes?

Thanks


 
 Reply 
 
Grant
Consultant, Specialized Inspection
Tuboscope, Saudi Arabia, Joined Jun 2002, 1

Grant

Consultant, Specialized Inspection
Tuboscope,
Saudi Arabia,
Joined Jun 2002
1
02:40 Jul-12-2007
Re: NDT of stainless steel pipes
Good Day Boy

Can you please give more info the type of SS pipes. Looking at diameter, wall thickness and type of SS. Also where the pipe is being used.

Regards
----------- Start Original Message -----------
: Hi all,
: I'm evaluating a series of stainless steel pipes and is wondering what are the practicle evaluation method (NDE) to assess pitting corrosion and stress corrosion cracking in S/S pipes?
: Thanks
------------ End Original Message ------------




 
 Reply 
 
J. Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J. Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
03:36 Jul-12-2007
Re: NDT of stainless steel pipes
I would ask the same question as Grant.

But some some considerations:

What is the carbon content.

What is the grain size.

Is this cast SS materials.

Is this SA 347 SS?

Generally, Refarcted L-waves are th best for examining SS materials. The desired frequency will depend upon grain size.

J. Mark Davis


----------- Start Original Message -----------
: Hi all,
: I'm evaluating a series of stainless steel pipes and is wondering what are the practicle evaluation method (NDE) to assess pitting corrosion and stress corrosion cracking in S/S pipes?
: Thanks
------------ End Original Message ------------




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

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
05:50 Jul-13-2007
Re: NDT of stainless steel pipes
What amount of SS pipe? Is this corrosion you are already aware of (you say assess) or are you seeking to determine IF there is any corrosion in a system? Bear in mind also that ultrasonics of forged SS pipe and of SS weldments have different parameters - equiaxed grains for forged, columnar grains for weld deposit.

If akready detected corrosion then what is its location - if its root erosion or HAZ attack then can you detect it without traversing through the weld deposit? If not then refracted longitudinal twin-crystal will be least "bent" by the columnar grains, if remote from welds then zero degree compression wave thickness inspection for corrosion pitting and bimodal for SCC.

If the second case, then have your corrosion engineer do a risk assessment along with the process and operating engineers. Take into account any possible "upsets".

Use an RBI methodology to spend effort on those areas most susceptible and of highest impact if failure occurs.


----------- Start Original Message -----------
: I would ask the same question as Grant.
: But some some considerations:
: What is the carbon content.
: What is the grain size.
: Is this cast SS materials.
: Is this SA 347 SS?
: Generally, Refarcted L-waves are th best for examining SS materials. The desired frequency will depend upon grain size.
: J. Mark Davis
:
: : Hi all,
: : I'm evaluating a series of stainless steel pipes and is wondering what are the practicle evaluation method (NDE) to assess pitting corrosion and stress corrosion cracking in S/S pipes?
: : Thanks
------------ End Original Message ------------




 
 Reply 
 

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