where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
2589 views
Technical Discussions
nkvon
Vietnam, Joined Oct 2015, 5

nkvon

Vietnam,
Joined Oct 2015
5
23:55 Oct-29-2015
Requirement to apply panoramic

I have a question, any spec or code mention requirement to applied panoramic technique ex: dia, thk,
I have 1 pipe dia: 305, thk 38.5, May I apply this technique for RT shoot to reduce the exposure time, distance pipe end to weld joint around 4 meter, I could use guide to orient source,
Thanks so much

 
 Reply 
 
Rooney
NDT Inspector,
Vietnam, Joined Jun 2013, 25

Rooney

NDT Inspector,
Vietnam,
Joined Jun 2013
25
02:14 Oct-30-2015
Re: Requirement to apply panoramic
In Reply to nkvon at 23:55 Oct-29-2015 (Opening).

As long as your Ug in the limited range per ASME V (If ASME V is your procedure).

 
 Reply 
 
jon wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

jon wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
08:05 Oct-30-2015
Re: Requirement to apply panoramic
In Reply to nkvon at 23:55 Oct-29-2015 (Opening).

As well as UG, you will need to be able to see the required wire or hole in your IQI.
If your guide tube is long enough you can fix it to a pole and measure on the outside the length from the edge of the open end to the weld and mark it on the pole. You will need a "spider" which is a centering device to ensure that the guide tube ends in the middle of the pipe. If your guide tube is too short you could put the isotope container on a trolley, find the middle of the pipe, fix the end piece and push the trolley to the required position leaving the wind-out hanging out of the pipe.
If you can't achieve sensitivity this way you could make eccentric exposures which will increase your source-object distance, a bit difficult to position the isotope end piece but not impossible.
All tried and tested tricks of the trade.

 
 Reply 
 
Babu
India, Joined Oct 2015, 8

Babu

India,
Joined Oct 2015
8
13:50 Oct-30-2015
Re: Requirement to apply panoramic
In Reply to nkvon at 23:55 Oct-29-2015 (Opening).

Dear nkvon,

As per calculation for given thick & Dia. Ug=0.6mm

But requirement as per T-274.2 (article-2 sec-5)
Ug=0.51mm for mtrl. thick<50mm.

So, you can not use the panoramic method for that component.

 
 Reply 
 
Leo
NDT Inspector,
Norway, Joined May 2008, 104

Leo

NDT Inspector,
Norway,
Joined May 2008
104
17:07 Oct-30-2015
Re: Requirement to apply panoramic
In Reply to Babu at 13:50 Oct-30-2015 .

How do you calculate Ug, if you don't know source size?

 
 Reply 
 
Shankar arumugam
Shankar arumugam
05:09 Oct-31-2015
Re: Requirement to apply panoramic
In Reply to nkvon at 23:55 Oct-29-2015 (Opening).

As per your requirement for panoramic technique, for the Ug value of 0.51mm, your effective source size should be 1.4 mm as per ASME Sec-V, Article 2 - T-274.2.

It is mentioned in ASME Sec-I, PW51.1 that "the requirements of T274 are to be used as a guide but not for rejection of radiographs unless the geometric unsharpness exceeds 0.07in (1.8mm)".

As per ASME Sec-VIII - UW51, "the final acceptance of the radiographs shall be based on the ability to see the prescribed IQI image and the specified hole of the designated wire of a wire IQI".

So you can go for panoramic technique, if you achieved the required sensitivity and within the max Ug value.

 
 Reply 
 
nkvon
Vietnam, Joined Oct 2015, 5

nkvon

Vietnam,
Joined Oct 2015
5
01:49 Nov-01-2015
Re: Requirement to apply panoramic
In Reply to Shankar arumugam at 05:09 Oct-31-2015 .

Dear Sir,
Thanks very much for help me, Focus size was 3.0, Panoramic was not achieve UG as ASME V, May I applied SWSI, so that UG=0.4,
A little Out of it, if panoramic, source not center of Pipe, will have any effect to film, Is it acceptable or not ?

 
 Reply 
 
Oliviero
NDT Inspector,
Quality Control srl, Italy, Joined Oct 2008, 414

Oliviero

NDT Inspector,
Quality Control srl,
Italy,
Joined Oct 2008
414
21:12 Nov-01-2015
Re: Requirement to apply panoramic
In Reply to nkvon at 01:49 Nov-01-2015 .

Hi Nkyon,
radiographic examination need to be performed achieving the contractual requirements, but it should be eprformed also to examine the object as necessary.
For ASME BPVC the Ug value is not every time mandatory. Anyway if you use a techinique which shall achive the Ug values the radiographic examination should be better.
When the source is out of center in a panoramic technique, the films shall be different in density (the films closer to the source shall be darker) and the Ug shall be different for each area (for darker films Ug shall have a higher value).
The acceptability of the technique shall be evaluated according to the documents applicable to the contract.

1
 
 Reply 
 
Shane Feder
, Quality Co-ordinator (SubSea)
Thailand, Joined Dec 2014, 89

Shane Feder

, Quality Co-ordinator (SubSea)
Thailand,
Joined Dec 2014
89
13:07 Nov-02-2015
Re: Requirement to apply panoramic
In Reply to Oliviero at 21:12 Nov-01-2015 .

Maximum Geometric Unsharpness is a recommendation as per ASME V - it is not a mandatory requirement.
Unless your specific fabrication code gives you a maximum Ug then all you need to worry about is complying with the correct density and sensitivity values.
Cheers,
Shane

 
 Reply 
 
jon wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

jon wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
14:05 Nov-02-2015
Re: Requirement to apply panoramic
In Reply to Oliviero at 21:12 Nov-01-2015 .

The idea of examining the weld with the eccentric technique is not to make one but two or three exposures. The advantage being that you are still shooting through one wall but you are increasing the source - object distance.
If you look at ISO-17636-1 Fig. A2 or A4 you can work out how many exposures are required (this applies to this norm of course).

 
 Reply 
 

Product Spotlight

HD-CR 35 NDT Computed Radiography System

Portable high-resolution CR scanner for all radiography applications - weld testing, profile images
...
and aerospace. No matter what type of radiographic testing you are performing, the unique TreFoc Technology of the HD-CR 35 NDT imaging plate scanner always guarantees the highest image quality.
>

OmniScan™ X3 flaw detector

The OmniScan X3 flaw detector is a complete phased array toolbox. Powerful tools, like total focus
...
ing method (TFM) images and advanced visualization capabilities, enable you to complete your inspection with greater confidence.
>

Magnetic X-Ray Pipeline Crawler 6''-60''

Suitable to work in 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometer
...
s and provide the efficient inspection of the pipeline.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window