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Technical Discussions
API Inspector
API Inspector
00:18 Mar-29-2007
API 1104 UT inspection

Does someone has already used a Phased Array UT procedure in lieu of a conventional UT one to comply with API Standard 1104?

As Phased Array system can obviously detect the same defects than a conventional system, would it be possible to use a PA instrument if a Level III does the proof that the procedure is reliable?

Thanks


    
 
 Reply 
 
EM
EM
05:58 Mar-31-2007
Re: API 1104 UT inspection
----------- Start Original Message -----------
: Does someone has already used a Phased Array UT procedure in lieu of a conventional UT one to comply with API Standard 1104?
: As Phased Array system can obviously detect the same defects than a conventional system, would it be possible to use a PA instrument if a Level III does the proof that the procedure is reliable?
: Thanks
------------ End Original Message ------------

Phased Array is already used on pipelines all over the world.



    
 
 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
06:15 Mar-31-2007
Re: API 1104 UT inspection
Phased Array UT has been in use on pipelines around the world for nearly 10 years now. In 1997 PRCI ran a research programme to confirm and demonstrate that phased arrays could perform as well as multiprobe units. With the results of this programme as the foundation, the first construction project using phased array UT systems with the zonal discrimination technique was made by Canspec and OIS in 1999 on the Maritime Northeast Pipeline. Since then the concepts have been used world wide. Presently there are nearly 100 phased array systems being used on pipeline construction.
Regards
Ed

----------- Start Original Message -----------
: Does someone has already used a Phased Array UT procedure in lieu of a conventional UT one to comply with API Standard 1104?
: As Phased Array system can obviously detect the same defects than a conventional system, would it be possible to use a PA instrument if a Level III does the proof that the procedure is reliable?
: Thanks
------------ End Original Message ------------




    
 
 Reply 
 
API Inspector
API Inspector
04:45 Apr-02-2007
Re: API 1104 UT inspection
Thank you for your answer,

What is surprising me, is that even thought Phased Array is widely used since the last decade, there is no clear mention of phased array (PA) in the API 1104 edited in 2005! According to your anwser, it seems evidence that PA can be used and the demonstration has been done with the PRCI. Should I understand that we can use PA in lieu of conventional UT without restriction if a procedure is done by a level III?

Regards


----------- Start Original Message -----------
: Phased Array UT has been in use on pipelines around the world for nearly 10 years now. In 1997 PRCI ran a research programme to confirm and demonstrate that phased arrays could perform as well as multiprobe units. With the results of this programme as the foundation, the first construction project using phased array UT systems with the zonal discrimination technique was made by Canspec and OIS in 1999 on the Maritime Northeast Pipeline. Since then the concepts have been used world wide. Presently there are nearly 100 phased array systems being used on pipeline construction.
: Regards
: Ed
: : Does someone has already used a Phased Array UT procedure in lieu of a conventional UT one to comply with API Standard 1104?
: : As Phased Array system can obviously detect the same defects than a conventional system, would it be possible to use a PA instrument if a Level III does the proof that the procedure is reliable?
: : Thanks
------------ End Original Message ------------




    
 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
02:08 Apr-02-2007
Re: API 1104 UT inspection
API 1104 like many other standards is concerned about setting essential minimum control paarameters not promoting specific technologies. If you read 1104 closely it is about minimum requirements to ensure performance and then determine a fcator for inspection error to be used in ECA calculations. It is this lack of detail that has led to the zonal ASTM document and other AUT qualification exercises such as those outlined in DNV FS 101.

You must also consider the application whilst one level of performance may be acceptable for pipelines and flowlines it may not be acceptable for fatigue sensitive sections such as SCR risers or offshore oil loading lines (OOL).

Whilst Phased Array as well as zonal techniques have been widely used around the world as correctly discussed by others it does not automatically follow that they will be able to perform to your specific required criteria.

The codes are about ensuring you understand the performance limitations of the proposed technique and its relationship to your detection, sizing and acceptance criteria.

Qualify your techniques should be your approach.


    
 
 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
05:01 Apr-06-2007
Re: API 1104 UT inspection
Zigmut:
API 1104, in the 19th edition, made several changes to the UT Inspection section (11.4). But as John O'Brien pointed out, you have to consider the application requirements and select (and demonstrate) the method you choose.
That being said, I see you have simply asked if phased array options can be used in lieu of "conventional" UT. If conventional (single or multiprobe) UT was appropriate and could be demonstrated successfully there is no reason to doubt that a phased array option could probably do a similar job.

But API 1104 is a very general Standard. You will note that it applies to both construction and in-service applications. The zonal method used in construction (by both conventional multi-probe and phased array systems) was developed to provide a very rapid method of data collection and analysis to keep up with the automated welding production rates (typically 5 minutes per weld).

If this is not the application you are looking at then options other than the zonal discrimination method may be suitable and adequately demonstrated in accord with API 1104, Section 11.4.4.

Regards
Ed

----------- Start Original Message -----------
: Thank you for your answer,
: What is surprising me, is that even thought Phased Array is widely used since the last decade, there is no clear mention of phased array (PA) in the API 1104 edited in 2005! According to your anwser, it seems evidence that PA can be used and the demonstration has been done with the PRCI. Should I understand that we can use PA in lieu of conventional UT without restriction if a procedure is done by a level III?
: Regards
:
: : Phased Array UT has been in use on pipelines around the world for nearly 10 years now. In 1997 PRCI ran a research programme to confirm and demonstrate that phased arrays could perform as well as multiprobe units. With the results of this programme as the foundation, the first construction project using phased array UT systems with the zonal discrimination technique was made by Canspec and OIS in 1999 on the Maritime Northeast Pipeline. Since then the concepts have been used world wide. Presently there are nearly 100 phased array systems being used on pipeline construction.
: : Regards
: : Ed
: : : Does someone has already used a Phased Array UT procedure in lieu of a conventional UT one to comply with API Standard 1104?
: : : As Phased Array system can obviously detect the same defects than a conventional system, would it be possible to use a PA instrument if a Level III does the proof that the procedure is reliable?
: : : Thanks
------------ End Original Message ------------




    
 
 Reply 
 

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