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Technical Discussions
Luis Marques
Luis Marques
09:37 Jun-17-2005
CUI-Corrosion Under Insulatio

Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?

To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.

Thanks to the forum




    
 
 
Nasrul Salman
Nasrul Salman
06:16 Jun-19-2005
Re: CUI-Corrosion Under Insulatio
True enough CUI is a very persistent probelm in the oil and gas industry. Current methods(NDT) that we use include LRUT and neutron backscatter. This avoids opening up the insulation and zones the CUI and wet areas for further inspection.
Its a start to a comprehensive corrosion prevention programme.

Pulsed Eddy current is useful if there are not many branches so it does not leads to leakage.


    
 
 
Godfrey Hands
Engineering,
PRI Nadcap, United Kingdom, Joined Nov 1998, 289

Godfrey Hands

Engineering,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
289
02:41 Jun-19-2005
Re: CUI-Corrosion Under Insulatio
----------- Start Original Message -----------
: Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?
: To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: Thanks to the forum
------------ End Original Message ------------

Dear Luis,
There are several techniques available as another message has indicated.
Our company promote and market Guided Wave Ultrasonics as a technique for detecting significant corrosion, especially in pipelines.
There are currently 3 well known manufacturers of Guided Wave Ultrasonics, two from the UK and one from the USA.
Both of the UK based systems operate by having a collar of Piezo transducers manufactured to fit the specific pipe outer diameter, and then applying it to test for corrosion and cracks.
NDT Consultants promote the system developed in the USA by South West Research Institute (SWRI) in San Antonio, Texas. This uses a low cost transducer assembly which can be permanently installed and left under insulation, making repeat inspections very simple and economical.

All of the guided wave applications are able to indicate significant corrosion under insulation which reduces the overall pipe cross section by something in the order of about 1% to 4%. None of them are able to directly pinpoint it, but can accurately show where along the length of pipe that the corrosion is located (usually within about 20 to 30 cms).
Most of the systems can test elevated pipework over distances of 10 metres or more, and tests with the SWRI system have shown detection of defects at distances on 150 metres in some cases.

Please contact me for more information. We would recomment an inspection service which our company can provide for you.

Regards,

Godfrey Hands
Godfrey@ndt-consultants.co.uk



    
 
 
Terry Rettig
Terry Rettig
01:57 Jun-21-2005
Re: CUI-Corrosion Under Insulatio
----------- Start Original Message -----------
: : Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?
: : To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: : Thanks to the forum
: Dear Luis,
: There are several techniques available as another message has indicated.
: Our company promote and market Guided Wave Ultrasonics as a technique for detecting significant corrosion, especially in pipelines.
: There are currently 3 well known manufacturers of Guided Wave Ultrasonics, two from the UK and one from the USA.
: Both of the UK based systems operate by having a collar of Piezo transducers manufactured to fit the specific pipe outer diameter, and then applying it to test for corrosion and cracks.
: NDT Consultants promote the system developed in the USA by South West Research Institute (SWRI) in San Antonio, Texas. This uses a low cost transducer assembly which can be permanently installed and left under insulation, making repeat inspections very simple and economical.
: All of the guided wave applications are able to indicate significant corrosion under insulation which reduces the overall pipe cross section by something in the order of about 1% to 4%. None of them are able to directly pinpoint it, but can accurately show where along the length of pipe that the corrosion is located (usually within about 20 to 30 cms).
: Most of the systems can test elevated pipework over distances of 10 metres or more, and tests with the SWRI system have shown detection of defects at distances on 150 metres in some cases.
: Please contact me for more information. We would recomment an inspection service which our company can provide for you.
: Regards,
: Godfrey Hands
: Godfrey@ndt-consultants.co.uk
------------ End Original Message ------------
We have several pulsed eddy current systems and use them on a routine basis with excellent results. We have applied it to many systems including feedwater heater shells, all types of piping, boiler tubing, sphere legs, coal handling systems, intake channels, etc. If you would like more information please feel free to contact me.
Terry Rettig
Vice President
Aptech Engineering Services
408 745-7000




    
 
 
Rich Roberts
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Rich Roberts

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
05:59 Jun-21-2005
Re: CUI-Corrosion Under Insulation
Dear Luis Marques,

Have you consider using Ultrasonic (UT) Intelligent Pigs to inspect the plant pipe lines? Quest TruTec’s FTIS UT Intelligent Pig technology is now being applied in plants around the world to inspect in plant piping which is buried below ground, insulated, under road crossings, etc. The fact that it is UT based technology, you obtain a 100% 3-Dimensional (3D) image of the line when it is complete so that you not only see the flaws, you also have the ability to better understand the patterns so that design changes can be made to prohibit the damage from happening to the new replacement piping.

Regards, Rich

----------- Start Original Message -----------
: Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?
: To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: Thanks to the forum
------------ End Original Message ------------




    
 
 
Jim Kovarik
Engineering
Lixi, Inc., USA, Joined Nov 1998, 39

Jim Kovarik

Engineering
Lixi, Inc.,
USA,
Joined Nov 1998
39
07:30 Jun-21-2005
Re: CUI-Corrosion Under Insulatio
----------- Start Original Message -----------
: Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?
: To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: Thanks to the forum
------------ End Original Message ------------

Dear Luis,
The Lixi GadScope works well for locating CUI under "loose" types of insulation like fiberglass. If the insulation material is rigid, then it will not allow corrosion product to migrate into the insulation material and it willnot be detected. The only exception to this is when corrosion product on a horizontal line falls to the 6 o'clock position and a gap exists between the pipe and the insulation. In this case, CUI residue may be detected, but not as a location directly on the pipe.
The Lixi Profiler is capable of penetrating through the diameter of the pipe and insulation. The Profiler is essentially a density gage and can locate CUI as a relative reduction in density. If you are interested, please contact me directly and I will forward an applications document which may assist you in better understanding the capabilities and limitations of the Profiler.


    
 
 
Terry Oldberg
Engineering, Mechanical Electrical Nuclear Software
Consultant, USA, Joined Oct 1999, 42

Terry Oldberg

Engineering, Mechanical Electrical Nuclear Software
Consultant,
USA,
Joined Oct 1999
42
09:01 Jun-25-2005
Re: CUI-Corrosion Under Insulation
Do the pulsed eddy current systems reference a statistical population such that one can estimate the probabilities of false negative and false positive error? If not, how can you say they produce "excellent results"?

: We have several pulsed eddy current systems and use them on a routine basis with excellent results. We have applied it to many systems including feedwater heater shells, all types of piping, boiler tubing, sphere legs, coal handling systems, intake channels, etc. If you would like more information please feel free to contact me.
: Terry Rettig
: Vice President
: Aptech Engineering Services
: 408 745-7000
------------ End Original Message ------------





    
 
 
Ron Olson
R & D, Aerospace
The Best Aviation Company In The World, USA, Joined Feb 2005, 23

Ron Olson

R & D, Aerospace
The Best Aviation Company In The World,
USA,
Joined Feb 2005
23
04:27 Jun-29-2005
Re: CUI-Corrosion Under Insulation
IOW, how reliable is the pulsed eddy current systems, Mr. Rettig?

----------- Start Original Message -----------
: Do the pulsed eddy current systems reference a statistical population such that one can estimate the probabilities of false negative and false positive error? If not, how can you say they produce "excellent results"?
: : We have several pulsed eddy current systems and use them on a routine basis with excellent results. We have applied it to many systems including feedwater heater shells, all types of piping, boiler tubing, sphere legs, coal handling systems, intake channels, etc. If you would like more information please feel free to contact me.
: : Terry Rettig
: : Vice President
: : Aptech Engineering Services
: : 408 745-7000
------------ End Original Message ------------




    
 
 
James Gauthier
NDT Inspector, Operations Manager
GE Inspection Services, USA, Joined Nov 2007, 25

James Gauthier

NDT Inspector, Operations Manager
GE Inspection Services,
USA,
Joined Nov 2007
25
05:44 Jun-29-2005
Re: CUI-Corrosion Under Insulation
GE Inspection Services offers a comprehensive CUI Inspection plan that utilizes several techniques/technologies. We offer INCOTEST, LIXI Profiler, Computed and Digital Radiography, etc. If anyone should need more information please contact me by email and I will be happy to explain the differences between the techniques.

Regards,

Jamie Gauthier


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

Peter Philipp

Consultant
PQS,
United Kingdom,
Joined Jan 2002
7
03:26 Jul-27-2005
Re: CUI-Corrosion Under Insulatio
Dear Luis,

We are Guided Ultrasonics Ltd, and we manufacture a Guided Wave pipe screening system called Wavemaker and are presently offering the Wavemaker G3 which is third generation Guided Wave equipment.

Our previous equipment the Wavemaker SE16 has approximately 40 systems working worldwide.

Most of our equipment users have experience of working in refineries and the technique is accepted by major operators such as Shell, Exxon and BP.

Shell in the US have in fact purchased one of our G3 units for their own development purposes.

Your application if looking CUI is precisely what it was developed for and involves removing a short length of insulation say 500mm long say every 30 to 60m depending on range of each test which itself is dependant on the general condition and contents of the pipe.

You can look at our website and contact us directly from it www.guided-ultrasonics.com

We are not service providors but can provide you with a list of service providors you could appoach.


----------- Start Original Message -----------
: Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?
: To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: Thanks to the forum
------------ End Original Message ------------




    
 
 
Geert Bontekoe
Geert Bontekoe
07:04 Aug-01-2005
Re: CUI-Corrosion Under Insulatio
Luis if you can take the pipelines offline for a while and the lines have at least 1.5D bends you could do an inline UT inspection. It wil give you very good results on all the area´s save for the bends. It also wil measure the remaining wall thickniss on the supports. You could ask Dacon hailand for a quote.
Regards Geert


----------- Start Original Message -----------
: Dear Luis,
: We are Guided Ultrasonics Ltd, and we manufacture a Guided Wave pipe screening system called Wavemaker and are presently offering the Wavemaker G3 which is third generation Guided Wave equipment.
: Our previous equipment the Wavemaker SE16 has approximately 40 systems working worldwide.
: Most of our equipment users have experience of working in refineries and the technique is accepted by major operators such as Shell, Exxon and BP.
: Shell in the US have in fact purchased one of our G3 units for their own development purposes.
: Your application if looking CUI is precisely what it was developed for and involves removing a short length of insulation say 500mm long say every 30 to 60m depending on range of each test which itself is dependant on the general condition and contents of the pipe.
: You can look at our website and contact us directly from it www.guided-ultrasonics.com
: We are not service providors but can provide you with a list of service providors you could appoach.
:
: : Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi or Xetec? And what about pulsed eddy currents?
: : To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: : Thanks to the forum
------------ End Original Message ------------




    
 
 
René Krutzen
NDT Inspector,
Intero Integrity Services B.V., Netherlands, Joined Oct 1999, 4

René Krutzen

NDT Inspector,
Intero Integrity Services B.V.,
Netherlands,
Joined Oct 1999
4
09:13 Aug-02-2005
Re: CUI-Corrosion Under Insulation
Dear Luis,

At A. Hak Industrial Services, The Netherlands, we have performed many in-line ultrasonic inspections of pipelines and furnace tubes ranging from 4" to 40" in diameter by sending an ultrasonic inspection tool (i.e. pig) through the pipeline or tubes. Our inspection pig is capable of negotiating 1.5D bends in pipelines and 1.0D bends in furnace tubes. It is not necessary to remove the insulation in order to apply our inspection system.
For more information you can visit our website at www.a-hak-is.nl or contact us.

Regards,

René Krutzen
A. Hak Industrial Services B.V.


----------- Start Original Message -----------
: Our oil refinery processes 10 million ton. Per year, it is located in Portugal at Sines town, south west coast versus the Atlantic Ocean about 150 Km south of Lisbon. Our refinery is 25years old; 5 years ago we implement a systematic program to determine the extent of corrosion under insulation. Has anyone got good results with real time radiography such as Lixi orXetec? And what about pulsed eddy currents?
: To remove the insulation for CUI Inspection using traditional methods is an expensive job and it takes a long time to do it. It was good for us to know about others practices and about proven new technologies used for cui detection.
: Thanks to the forum
------------ End Original Message ------------




    
 
 
Terry Oldberg
Engineering, Mechanical Electrical Nuclear Software
Consultant, USA, Joined Oct 1999, 42

Terry Oldberg

Engineering, Mechanical Electrical Nuclear Software
Consultant,
USA,
Joined Oct 1999
42
03:53 Aug-16-2005
Re: CUI-Corrosion Under Insulation
Does GE's technology reference a statistical population? If not, how would one establish its reliability?
----------- Start Original Message -----------
: GE Inspection Services offers a comprehensive CUI Inspection plan that utilizes several techniques/technologies. We offer INCOTEST, LIXI Profiler, Computed and Digital Radiography, etc. If anyone should need more information please contact me by email and I will be happy to explain the differences between the techniques.
: Regards,
: Jamie Gauthier
------------ End Original Message ------------




    
 
 
Inna Krivenko
Inna Krivenko
07:20 Nov-25-2006
Re: CUI-Corrosion Under Insulatio
----------- : Dear Sirs,
We would greatly appreciate, if you provide us a commercial offer for the delivery of the Wavemaker G3 system for testing pipeline.
With best regards,
Inna Krivenko


    
 
 
Godfrey Hands
Engineering,
PRI Nadcap, United Kingdom, Joined Nov 1998, 289

Godfrey Hands

Engineering,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
289
02:07 Nov-29-2006
Re: CUI-Corrosion Under Insulatio
----------- Start Original Message -----------
: ----------- : Dear Sirs,
: We would greatly appreciate, if you provide us a commercial offer for the delivery of the Wavemaker G3 system for testing pipeline.
: With best regards,
: Inna Krivenko
------------ End Original Message ------------

We have tried to send you a commercial offer for a system similar to Wavemaker, but we are unable to get the email to your email account.
Please email me at Godfrey@ndt-consultants.co.uk with mail address and fax number.
Thanks
Godfrey Hands



    
 
 

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