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- since 1996 -

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Technical Discussions
Prasad
Director, NDT Consultant
Energy Workforce Group of Companies, Malaysia, Joined Aug 2003, 12

Prasad

Director, NDT Consultant
Energy Workforce Group of Companies,
Malaysia,
Joined Aug 2003
12
01:33 May-28-2004
NDT method selection on SS Vessels

Dear All,

Could you all please advise me suitable NDT methods and their detailed specifications for the surface and near surface crack detection of pressure vessels made of made of SS304L and SS316L materials and operating at 65-80 deg. C temperature range

Thanks,

Prasad




 
 Reply 
 
D.Simon Amallraja
D.Simon Amallraja
04:58 May-31-2004
Re: NDT method selection on SS Vessels
----------- Start Original Message -----------
: Dear All,
: Could you all please advise me suitable NDT methods and their detailed specifications for the surface and near surface crack detection of pressure vessels made of made of SS304L and SS316L materials and operating at 65-80 deg. C temperature range
: Thanks,
: Prasad
------------ End Original Message ------------

Dear Mr. Prasad,

Give your complete postal address with telephone nos, so we can contact you and discuss with your requirement. We can also suggest you suitable equipment and guide you.

D.Simon Amallraja.
Asst.Manager -NDT,
Mahindra Intertrade Ltd,
1-7-1,Parklane, Secunderabad - 500003.
Ph: 0 98480 43309.


 
 Reply 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 307

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
307
08:23 Jun-01-2004
Re: NDT method selection on SS Vessels
----------- Start Original Message -----------
: Dear All,
: Could you all please advise me suitable NDT methods and their detailed specifications for the surface and near surface crack detection of pressure vessels made of made of SS304L and SS316L materials and operating at 65-80 deg. C temperature range
: Thanks,
: Prasad
------------ End Original Message ------------
Dear Prasad,
Perhaps you could provide some more details for the NDT community out there.
What do you mean by "Near Surface".
What do you want to inspect? Welds and H.A.Z. only or entire vessel?
I assume that the vessel will be at normal temperature and access inside when you want to inspect. Can you please confirm. Also that any necessary insulation will be removed prior to inspection.

Regards,

Godfrey Hands




 
 Reply 
 
R J Chaudhari
Director,
CALTECH ENGINEERING SERVICES, India, Joined Mar 2003, 13

R J Chaudhari

Director,
CALTECH ENGINEERING SERVICES,
India,
Joined Mar 2003
13
03:56 Jun-02-2004
NDT method selection on SS Vessels
Dear Prasad,
Best NDT Method will be Field Metallography. You can confirm not only cracks but also microstructure of pressure vessel without distroying material. You can also get photographs and replicas for your records and expert evaluations, decisions.

Regards,

R J Chaudhari


----------- Start Original Message -----------
: : Dear All,
: : Could you all please advise me suitable NDT methods and their detailed specifications for the surface and near surface crack detection of pressure vessels made of made of SS304L and SS316L materials and operating at 65-80 deg. C temperature range
: : Thanks,
: : Prasad
: Dear Prasad,
: Perhaps you could provide some more details for the NDT community out there.
: What do you mean by "Near Surface".
: What do you want to inspect? Welds and H.A.Z. only or entire vessel?
: I assume that the vessel will be at normal temperature and access inside when you want to inspect. Can you please confirm. Also that any necessary insulation will be removed prior to inspection.
: Regards,
: Godfrey Hands
------------ 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
01:59 Jun-02-2004
Re: NDT method selection on SS Vessels
Prasad,

One of the best "NDT" methods for SS vessels is using ID and OD Creeping Waves. These waves travel along the ID and OD surfaces (longitudinal waves velocities) to detect flaws which are perpendicular to the surfaces.

I have demonstrated detection of ID and OD cracks as small as 0.001 inches in depth.

One concern is the type of SS material. What is the grain size. When the grain size approaches "1" or "O" in size Creeping waves generation on the ID surface may not be generated. What is the thickness?

Another consideration is the carbon content and what type of crack you might be looking for.

For a explanation of ID and OD Creeping Waves go to the publications section of ndt.net and see review The Advanced Ultraosnic Sizing Handbook I wrote.

Sincerely,

J. Mark Davis

----------- Start Original Message -----------
: Dear Prasad,
: Best NDT Method will be Field Metallography. You can confirm not only cracks but also microstructure of pressure vessel without distroying material. You can also get photographs and replicas for your records and expert evaluations, decisions.
: Regards,
: R J Chaudhari
:
: : : Dear All,
: : : Could you all please advise me suitable NDT methods and their detailed specifications for the surface and near surface crack detection of pressure vessels made of made of SS304L and SS316L materials and operating at 65-80 deg. C temperature range
: : : Thanks,
: : : Prasad
: : Dear Prasad,
: : Perhaps you could provide some more details for the NDT community out there.
: : What do you mean by "Near Surface".
: : What do you want to inspect? Welds and H.A.Z. only or entire vessel?
: : I assume that the vessel will be at normal temperature and access inside when you want to inspect. Can you please confirm. Also that any necessary insulation will be removed prior to inspection.
: : Regards,
: : Godfrey Hands
------------ End Original Message ------------




 
 Reply 
 

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