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Technical Discussions
Rory
Rory
16:42 Jan-04-2019
NDT Testing on Economizer Tubes (U bend)

Hi Everyone ,

Hope everyone has started their new year well, in good health and with good expectations !

I would like to inquire whether anybody has any recommendations of what method of NDT to imploy for testing the interior of inservice economizer tubes ( just the U bend ), from the exterior.

The client experienced a tube leak on one of their tubes. They assume it resulted from very small internal pits. We have a sample of the U bend, Evidentally there are very apparent small individual and grouped pits. However, the smallest is 1mm.

OD: 40mm - 50mm
Material : Carbon Steel TU 37 C

IRIS and RFET is really out of question.

Does anyone suggest Phaysed Array ?

Thanks Guy's

    
 
 
Emmanuel
Emmanuel
08:55 Jan-05-2019
Re: NDT Testing on Economizer Tubes (U bend)
In Reply to Rory at 16:42 Jan-04-2019 (Opening).

You can use Olympus FlexoFORM Scanner and probe for Small-diameter elbows or pipes from 1.3 in. OD up to 4 in. OD. see link https://www.olympus-ims.com/en/scanners/flexoform/#!cms[tab]=%2Fscanners%2Fflexoform%2Fscanning-option

    
 
 
James
R & D,
United Kingdom, Joined Dec 2018, 1

James

R & D,
United Kingdom,
Joined Dec 2018
1
16:05 Jan-05-2019
Re: NDT Testing on Economizer Tubes (U bend)
In Reply to Rory at 16:42 Jan-04-2019 (Opening).

zoom image
Hello Rory,

For an automated scanning solution (external), a magnetic crawler with a reciprocating rack may be suitable for mapping the geometry (please see attached image).

Although an internally deployed probe may not be your preferred approach, there are solutions to deploy probes internally via an inspection stub rather than cutting into the header; see link for more info ...

https://www.linkedin.com/pulse/using-novel-technique-hrsg-tube-inspection-james-ireland/

Regards, James
    
 
 
Vignesh Sivanandam
Vignesh Sivanandam
18:53 Jan-05-2019
Re: NDT Testing on Economizer Tubes (U bend)
In Reply to Rory at 16:42 Jan-04-2019 (Opening).

Acoustic Pulse Reflectometry (APR) shall be used for such inspection of economizer tubes that has multiple bends . APR uses only sound waves abs hence its material and configuration independent . For more info : visit www.talcyon.com

    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 822

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
822
04:15 Jan-10-2019
Re: NDT Testing on Economizer Tubes (U bend)
In Reply to Rory at 16:42 Jan-04-2019 (Opening).

Rory,

I don't know how much access you have to the area of inspection, but simply wiping down the tubes with a solvent and applying a coat of developer could do the trick assuming the tubes are filled with fluid. Just a taught.

    
 
 
Creed
NDT Inspector,
n.n., Joined Jul 2009, 21

Creed

NDT Inspector,
n.n.,
Joined Jul 2009
21
07:22 Jan-10-2019
Re: NDT Testing on Economizer Tubes (U bend)
In Reply to Rory at 16:42 Jan-04-2019 (Opening).

Hi,
Can you have a try profile RT with few difference directions to see if there is internal pitting?

    
 
 

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