Method for volumetric inspection for full pene corner weld joint 2

[Tasutasu]

Dear all,
I am requested to perform volumetric inspectin(RT) on full penetration corner weld(not butt) such as category D weld(weld to flange and shell) ASME SEC.VIII DIV.2 by customer.
But as mentionded on some standard(ASME SEC.VIII div.1,2 , ASME B31.3),
it is difficult to perform RT on this weld and also it is not required to perform RT on this weld as per some standard.
So I don't know why customer require this RT and I can not find and prepare the suitable prcedure for this RT.
Could you help me and please tell me if you have same situation and how to solve it?

 

[r6155]

"So I don't know why customer require this RT......": Consult the customer.
Try with Ultrasonic Test (UT)

Regards
r6155

 

[Tasutasu]

Dear r6155,
thank you for reply.

Now, I am planning to prepare the procedure for UT in stead of UT.
But, I think it is difficult to perform UT/RT on entire volume of welding(that is 100% volumetric inspection.)
Of course, I am planning to inform the customer of this problem and
discuss to solve it on Kick of meeting.

But I have no experience to solve this problem and
If you have the same situation, please tell me how to solve it.

best regards,

Tasutasu.

 

[SnTMan]

Tasutasu, are you sure your customer is not really requiring that these joints be butt welds such that they can be RT'd?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[racookpe1978]

Well, a full penetration "corner weld" has 3 butt welds (each with a V-prep probably) intersecting at the corner. All but the very last corner (the plate thickness really) can be RT inspected with traditional techniques. There is some overlap anyway, so your RT tech's need to wrap the film around the outside, and then place the source inside at the corner as deep as it can go. Then expose the wrapped film. Think "wrapping" like a Christmas present package. Overlap is fine.

 

[Tasutasu]

Dear all,

Thanks all for several comments.

For more discussion, Please kindly see attached photo as welding joint form.

This joint is such as olet weld(Pipe to Pipe/ Pipe to shell) and
This portion is changing thickness.

I understand that it is difficult to perform RT on changing thickness such as above joint.
Detail of difficult reason is as follows.
1. select the IQI as per ASME Sec.VIII DIV.2 UW-51.
2. Locate the source of radiation and film as per Geometric unsharpness of ASME Sec.VIII DIV.2 UW-51.

Do anyone know me that my understand is correct or not, and how to resolve above problem.

--Each comments reply--
>Dear SnTMan
Thank you.
I will confirm this issue to customer with on KOM.
Now situation,
As mentioned on customer spec.,
Full penetration weld is 100%RT and if possible, I can offer the 100% UT procedure.
Here, Customer spec isn't described whether full pene include butt weld and other weld
(such as corner weld).

>racookpe197
Thank you.
If possible, please tell me your mentioned weld is met to uploaded photo?
Sorry, I understand your mentioned weld.
" a full penetration "corner weld" has 3 butt welds (each with a V-prep probably) intersecting at the corner"
--Each comments reply--

 

[r6155]

Procedure of NDE and personnel performing nondestructive examinations shall be qualified and certified.
See ASME VIII and V

Regards.
r6155

 

[JR97]

Tasutasu,

What size nozzle bore diameter are we talking about? If the nozzle bore is large enough, put the film cassette inside the nozzle and position the source about 15 degrees above the shell. As far as penetrameters, it can be based on average thickness, but the easiest is to place the appropriate wire set across the weld. You should be covered for multiple thicknesses that way. If the nozzle bore is too small to place the film cassette inside, you may need to consider a re-design to a plug type design versus the current paste on design. As long as you have access to the inside of the shell there shouldn't be any issues with a plug type nozzle

JR97

 

[r6155]

Tasutasu
Please ¿can you tell us dimensions of the parts to be welded?

Regards
r6155

 

[Tasutasu]

Dear all,

Detail of flange is as follows and as per attached.

[Material]
Body: Super duplex stainless steel(SDSS)
Flange: SDSS
Weld metal: SDSS
[Flange 1]
Flange class: ASME 2500Lb-250A R.J
Weld leg size: Both 35mm×35mm
Material thickness:50mm

[Flange 2]
Flange class: ASME 2500Lb-250A R.J
Weld leg size: Both 28mm×28mm
Material thickness:32mm

Distance from Flange 1 to Flange 2 is about 340mm.
If source size is out side to shell,
It is difficult to perform RT with suitable geometric unsharpness to influence the other flange.

So please inform me of more comments and opinion.

By the way, NDE.net issue the following PAUT technical document in Online workshop on sep. 2010.

URL link:

https://www.ndt.net/search/docs.php3?id=9613&content=1

https://www.ndt.net/search/docs.php3?id=9614&content=1

If I perform the above PAUT, What I need to prepare the test?
Any TP and/or UT facility and/or PC software ? cost is more expensive than general UT?

 

[r6155]

Tasutasu
Fillet welds as showed in your drawing are excessive: see UW-16

I consider that you are not in conditions / experience for this kind of pressure vessel.
I suggest:
1) contact a pressure vessel engineer
2) contact a welding engineer
3) instead of UT or RT on nozzles a better way is Acoustic Emission Test (during hydrostatic pressure test).

Regards
r6155

 

[DekDee]

You have an ID of 210 mm so that is easily big enough to place films internally and shoot from the outside.
If you can't get access to shoot 100% due to location of the other nozzle then explain that to your client.
Then they either decide whether possibly 80/85/90 % coverage is sufficient or you have to look at UT.
If you have 100% clean film then you have a strong arguement.
If you have weld issues on the available films then you have a problem with the uninspected area.
Regards,
Shane

 

[weldstan]

While I would never had allowed you to use this joint when RT was specified, RT or UT of it is difficult to meet any Code requirements. Whereas Code does not require volumetric examination, I would discuss with the Owner that RT or UT be considered for information only.