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Technical Discussions
Sibusiso MZILA
Engineering, Pipeline integrity
Transnet SOC Limited, South Africa, Joined May 2004, 13

Sibusiso MZILA

Engineering, Pipeline integrity
Transnet SOC Limited,
South Africa,
Joined May 2004
13
02:52 Sep-25-2007
Pipeline field inspections

I am an integrity practitioner for a petroleum & gas underground pipeline network operator company - I am therefore a client to NDT providers.
After in-line inspections we always dig up the events and call on NDT personnel to verify the events.
The events include wall loss, crack features, laminations, etc. and may be located sub-surface, externally and internally. We ordinarily ask for MT, RT & UT which I feel are all relative to the operator, rendering them subjective forms of testing.
I am therefore wanting to view any available portable objective equipment on the market we can employ especially for sub-surface and internal events. Our pipelines include 6", 8", 12", 16", 18" & 20".
It would be interesting to hear from other pipeline operators as well.


    
 
 Reply 
 
chris s
chris s
02:54 Sep-25-2007
Re: Pipeline field inspections
----------- Start Original Message -----------
: I am an integrity practitioner for a petroleum & gas underground pipeline network operator company - I am therefore a client to NDT providers.
: After in-line inspections we always dig up the events and call on NDT personnel to verify the events.
: The events include wall loss, crack features, laminations, etc. and may be located sub-surface, externally and internally. We ordinarily ask for MT, RT & UT which I feel are all relative to the operator, rendering them subjective forms of testing.
: I am therefore wanting to view any available portable objective equipment on the market we can employ especially for sub-surface and internal events. Our pipelines include 6", 8", 12", 16", 18" & 20".
: It would be interesting to hear from other pipeline operators as well.
------------ End Original Message ------------

i would disagree that RT is subjective. try having an outside 3rd party interprete the film.


    
 
 Reply 
 
trex
trex
01:06 Sep-26-2007
Re: Pipeline field inspections
----------- Start Original Message -----------
: : I am an integrity practitioner for a petroleum & gas underground pipeline network operator company - I am therefore a client to NDT providers.
: : After in-line inspections we always dig up the events and call on NDT personnel to verify the events.
: : The events include wall loss, crack features, laminations, etc. and may be located sub-surface, externally and internally. We ordinarily ask for MT, RT & UT which I feel are all relative to the operator, rendering them subjective forms of testing.
: : I am therefore wanting to view any available portable objective equipment on the market we can employ especially for sub-surface and internal events. Our pipelines include 6", 8", 12", 16", 18" & 20".
: : It would be interesting to hear from other pipeline operators as well.
: i would disagree that RT is subjective. try having an outside 3rd party interprete the film.
------------ End Original Message ------------

tried Long Range UT?



    
 
 Reply 
 
Sibusiso MZILA
Engineering, Pipeline integrity
Transnet SOC Limited, South Africa, Joined May 2004, 13

Sibusiso MZILA

Engineering, Pipeline integrity
Transnet SOC Limited,
South Africa,
Joined May 2004
13
02:28 Sep-27-2007
Re: Pipeline field inspections
----------- Start Original Message -----------
: : : I am an integrity practitioner for a petroleum & gas underground pipeline network operator company - I am therefore a client to NDT providers.
: : : After in-line inspections we always dig up the events and call on NDT personnel to verify the events.
: : : The events include wall loss, crack features, laminations, etc. and may be located sub-surface, externally and internally. We ordinarily ask for MT, RT & UT which I feel are all relative to the operator, rendering them subjective forms of testing.
: : : I am therefore wanting to view any available portable objective equipment on the market we can employ especially for sub-surface and internal events. Our pipelines include 6", 8", 12", 16", 18" & 20".
: : : It would be interesting to hear from other pipeline operators as well.
: : i would disagree that RT is subjective. try having an outside 3rd party interprete the film.
: tried Long Range UT?
------------ End Original Message ------------

We ordinarily work on 'live' situations, i.e. pipeline full of flowing products and active cathodic protection.
RT works well in 'dead' situations.
Long range UT has not been tried, but question is what is the extent of the operator intepretation?



    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
03:48 Sep-27-2007
Re: Pipeline field inspections
I am not clear on what you might mean by "..I feel are all relative to the operator, rendering them subjective forms of testing."
If you represent the Owner then a well defined specification by your company should provide instructions to your service providers that can provide methods of quantitative assessment. As with any NDT examination there may be tolerances in the accuracy of the findings and SOME of these can be attributrable to operators. However, with well controlled parameters and a degree of mechanisation, these tolerances can be tightened to a relatively high degree. But do not be duped into expecting the impossible by unscrupuless service providers nor should you (as the specification writer) impose unreasonable expectations on "simple" NDT methods.
If you have been doing verification "digs" at suspect locations identified by pigging then you should not expect all locations to contain flaws. The pigging process itself may be at fault.


----------- Start Original Message -----------
: : : : I am an integrity practitioner for a petroleum & gas underground pipeline network operator company - I am therefore a client to NDT providers.
: : : : After in-line inspections we always dig up the events and call on NDT personnel to verify the events.
: : : : The events include wall loss, crack features, laminations, etc. and may be located sub-surface, externally and internally. We ordinarily ask for MT, RT & UT which I feel are all relative to the operator, rendering them subjective forms of testing.
: : : : I am therefore wanting to view any available portable objective equipment on the market we can employ especially for sub-surface and internal events. Our pipelines include 6", 8", 12", 16", 18" & 20".
: : : : It would be interesting to hear from other pipeline operators as well.
: : : i would disagree that RT is subjective. try having an outside 3rd party interprete the film.
: : tried Long Range UT?
: We ordinarily work on 'live' situations, i.e. pipeline full of flowing products and active cathodic protection.
: RT works well in 'dead' situations.
: Long range UT has not been tried, but question is what is the extent of the operator intepretation?
------------ End Original Message ------------




    
 
 Reply 
 
Michael Moles †2014 *1948
, Joined ,
00:19 Sep-28-2007
Re: Pipeline field inspections
----------- Start Original Message -----------
: I am an integrity practitioner for a petroleum & gas underground pipeline network operator company - I am therefore a client to NDT providers.
: After in-line inspections we always dig up the events and call on NDT personnel to verify the events.
: The events include wall loss, crack features, laminations, etc. and may be located sub-surface, externally and internally. We ordinarily ask for MT, RT & UT which I feel are all relative to the operator, rendering them subjective forms of testing.
: I am therefore wanting to view any available portable objective equipment on the market we can employ especially for sub-surface and internal events. Our pipelines include 6", 8", 12", 16", 18" & 20".
: It would be interesting to hear from other pipeline operators as well.
------------ End Original Message ------------

There is a lot of available pipeline inspection equipment on the amrket for you to review. Try Olympus's OmniScan and PipeSMART systems to start. There are also many monocrystal systems, e.g. EPOCH. Check our web site, or contact me directly.




    
 
 Reply 
 
Quintin Bower
Quintin Bower
03:27 Oct-01-2007
Re: Pipeline field inspections
Sonatest offers an extensive range of portable ultrasonic testing equipment, from conventional monoelement to multielement phased array units. Please visit www.sonatest.com for more information on equipment and distributors.


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

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
06:13 Oct-08-2007
Re: Pipeline field inspections
Are you saying that after excavation the conventional NDT does not provide results matching with the pig defect log? If so, ccuracy of tracing of the pigging location markers is paramount, other wise you may be digging in the wrong place.

My thought is that its not so much expensive latest computerised equipment which is a necessity (though it may help), but rather thorough training of all those involved (not just the NDT technicians) in pipeline inspection and assessment. Many pigging companies present their results and leave the field without the necessary "after-sales" service to assist the pipeline operator to make sense of the MFL/UT/ET locations or indications. This is left to the NDT technician who has most probably not seen the pigging indication nor had any training in pigging operations and has only his own skills and experience to work with.

One would assume that oil and gas producers would spare no time, effort or money to ensure an accurate assessment of the condition of their principal (sometimes only) means of getting their product to the market, but that is in my experience far from the case. So witness what happens on the North Slope and perhaps many other locations.



    
 
 Reply 
 

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