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- since 1996 -

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Technical Discussions
Stuart Ogilvie
Stuart Ogilvie
08:23 May-05-2006
Subsea Crack Detection by ROV

I am looking for any information, websites or companies that may deal with subsea crack detection using a ROV. I am aware of ACFM techniques, which detect surface cracking, but would like to confirm if there is an NDT technique available that can detect fatigue cracking at the weld root of a subsea component. Are there any reliable UT probes that can do this by ROV?
Any help would be greatly appreciated. Thanks.


    
 
 
Simon Amallraja
Simon Amallraja
08:42 May-08-2006
Re: Subsea Crack Detection by ROV
----------- Start Original Message -----------
: I am looking for any information, websites or companies that may deal with subsea crack detection using a ROV. I am aware of ACFM techniques, which detect surface cracking, but would like to confirm if there is an NDT technique available that can detect fatigue cracking at the weld root of a subsea component. Are there any reliable UT probes that can do this by ROV?
: Any help would be greatly appreciated. Thanks.
------------ End Original Message ------------

Contact Mr. Jorgen Dam of Force Technology of Denmark, who are the Manufacturer's of P Scan, which is suitable for the application you have asked for.

www.force.dk

D.Simon Amallraja.


    
 
 
Peter Philipp
Consultant
PQS, United Kingdom, Joined Jan 2002, 7

Peter Philipp

Consultant
PQS,
United Kingdom,
Joined Jan 2002
7
01:40 Jul-01-2006
Re: Subsea Crack Detection by ROV
Guided waves can be used to find these cracks.

It is not an easy application and may need reference to a "good" weld as a fingerprint but it is possible.

We have equipment available and experience with both ROV and diver deployed tesing.

For more info and contact details see www.guided-ultrasonics.com

----------- Start Original Message -----------
: I am looking for any information, websites or companies that may deal with subsea crack detection using a ROV. I am aware of ACFM techniques, which detect surface cracking, but would like to confirm if there is an NDT technique available that can detect fatigue cracking at the weld root of a subsea component. Are there any reliable UT probes that can do this by ROV?
: Any help would be greatly appreciated. Thanks.
------------ End Original Message ------------




    
 
 
Manfred Ronald Richter
Manfred Ronald Richter
03:37 Jul-02-2006
Re: Subsea Crack Detection by ROV
See www.force.dk, they have some experience in underwater UT inspection through ROV.

----------- Start Original Message -----------
: I am looking for any information, websites or companies that may deal with subsea crack detection using a ROV. I am aware of ACFM techniques, which detect surface cracking, but would like to confirm if there is an NDT technique available that can detect fatigue cracking at the weld root of a subsea component. Are there any reliable UT probes that can do this by ROV?
: Any help would be greatly appreciated. Thanks.
------------ End Original Message ------------




    
 
 
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
03:19 Jul-03-2006
Re: Subsea Crack Detection by ROV
Peter,

Creeping Waves are very effective for detecting OD connected (and ID) cracks like Fatigue cracks

Also, I have developed some techniques using Phased Arrays with Creeping waves.

Both conventional and Phased Arrays are very effective for cracks with a depth of .005 inches in depth. S/N ratio of about 8 to 10 to 1.

Sincerely,

J. Mark Davis

----------- Start Original Message -----------
: Guided waves can be used to find these cracks.
: It is not an easy application and may need reference to a "good" weld as a fingerprint but it is possible.
: We have equipment available and experience with both ROV and diver deployed tesing.
: For more info and contact details see www.guided-ultrasonics.com
: : I am looking for any information, websites or companies that may deal with subsea crack detection using a ROV. I am aware of ACFM techniques, which detect surface cracking, but would like to confirm if there is an NDT technique available that can detect fatigue cracking at the weld rootof a subsea component. Are there any reliable UT probes that can do this by ROV?
: : Any help would be greatly appreciated. Thanks.
------------ End Original Message ------------




    
 
 
John Turner
John Turner
04:35 Jul-04-2006
Re: Subsea Crack Detection by ROV
----------- Start Original Message -----------
We have recently been involved in two subsea projects which involved us designing and manufacturing ultrasonic sensors to operate at enormous depths.

One project was to do with pipeline monitoring which required using sensors to withstand 2,000m of depth, while the other (completely different) project was the location of stiffeners on the deck of the sunken 'Prestige' Oil Tanker at 4,000m depth prior to removal of the remaining oil in 2004. The (immersion-type) transducers were scanned over the deck using a RoV and had to detect very small signals in B-scan mode. The digital signals were then transfered to the survey ship using well-known comms protocols.

The probes could stay at these depths for long periods and only experienced a 1 or 2 dB drop in sensitivity over the depth range 0 to 4,000m.

We have the capability to apply this technology to other types of subsea inspection using different transducer designs.

Phoenix ISL also make a wide range ofshear and compression wave probes for manual or automated testing at shallower depths and we have also done a lot of work on the use of creeping waves for OD and ID crack detection using both phased arrays and conventional probes.

Two papers were presented at the recent BINDT Advanced NDT mini-conference on both the subsea and creeping wave work.


    
 
 
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