Re: [MW:17839] Radiographic Film Interpretation Excess Penetration..

Dear Friends,

Sorry for the delay replay, i have a problem for network error.

 

There is some lack of information in your inquiry email.

 

Question1: RT defect indication was of how much length in the film ? Was it a girth weld ? 

Answer 1 : Indication length 20mm, yes girth weld

 

Question2: The inspector who rejected the film, gave you the answer or justification that why he is rejecting or giving repair, can you explain his way of answer ?

 Answer 2: Yes he said the last movement pigging test is problem

Question3: As you have mentioned in your email that inspector has measured the defect with the use of ruler.

How he has mesured the dimension of the defect (that is widthwise or lenghwise across the film or by any calculation) ?

What was his conclusion / final measurement length / depth of weld reinforcement after measuring ?

Answer 3: He measured by like defect  excess penetration was 6mm. as per specification 3mm Allowed  

Question4: What was the welding process ?

Answer 4: Root SMAW (6010 cellulosic),+ hot,fill & Cap FCAW.

Question5: Was there any access in the inside of the pipe to measure actual weld reinforcement ?

 Answer 5: NO. that is 24" cross country pipeline 

Queston6: What was the pipe thickness ?

 Answer 6: 8.74mm

Please refer my reply point wise.

 

Point No.1: Rejection should always be based on some measurable basis / or by some written reference while referring the code.

Point No.2: Can anyone explain the technique, how the depth of weld reinforcement be measured from RT film ?

 

Point No.3: API 1104 is silent about RT acceptance criteria for weld reinforcement.

 

Point No.4: Refer Appendix A of API 1104 (A 5.1) for the limitations / inaccauaracy of RT for evaluating such defect. (Proper Justification is required from inspector for rejection)

 

Point No.5: If the inspector is unable to explain the calculation he made, I think he has no right to reject the film.

 

Point No.6: API 1104 is allowing some major welding defects like Incomplete penetration, Incom. Fusion etc., then the weld refinforcement would not be a cause of rejection only by assuming & if not measurable.

 

Point No.7: Clause no. 13.8.4 Rejection Based On Reinforcement, is for Automatic welding without filler metal addtions (e.g. flash butt welding process)  - Was pipe welding process is the same ?

On Thu, May 30, 2013 at 9:51 AM, bijoy joseph <bijoy.joseph1@gmail.com> wrote:

dear meisam,

Please explain your  secret technique to measure the 3 dimensional defect in RT 

rgds

On Mon, May 27, 2013 at 5:31 PM, meisam shokri arfaei <meisamshokri@gmail.com> wrote:

Dear friend,

At first look we should say it is not practical generally to measure the excess penetration from RT film because it is 2-dimensional. But some techniques may be employ to do this measurement by RT. Also some joints may be shown their excess penetration on RT film If you didn't use such techniques and your joint is simple butt joint, so your answer is NO. 

Regards

On Mon, May 27, 2013 at 12:54 PM, Dominic v.k.dominic <v.k.dominic@gmail.com> wrote:

Dear friend ,

that code is API 1104..

my question is excess penetration how is measuring the rt film like ruler scale..your knowledge it is possible

Thanks

Dominic V.K.  

On Mon, May 27, 2013 at 10:28 AM, Babur Khan <mbabur.bwp@gmail.com> wrote:

Dear friend,

1st you mention construction code which applicable if ASME B31.3-2008 then see Table 341.3.2 Acceptance Criteria for Welds and Examination Methods for Evaluating Weld Imperfections

as per this
L Height of reinforcement or internal protrusion [Note (8)] in For T w, mm (in.) Height, mm (in.)
any plane through the weld shall be within limits of
the applicable height value in the tabulation at right, ≤ 6 (1⁄4) ≤ 1.5 (1⁄16)
except as provided in Note (9). Weld metal shall merge > 6 (1⁄4), ≤ 13 (1⁄2) ≤ 3 (1⁄8)
smoothly into the component surfaces. > 13 (1⁄2), ≤ 25 (1) ≤ 4 (5⁄32)
> 25 (1) ≤ 5 (3⁄16)
M Height of reinforcement or internal protrusion [Note (8)] Limit is twice the value applicable for L above
as described in L. Note (9) does not apply.

so and same like API 1104 have criteria
 

On Mon, May 27, 2013 at 9:28 AM, Dominic v.k.dominic <v.k.dominic@gmail.com> wrote:

Dear Expertise,

I have this issue please anyone clarify me,

One QA/QC- Inspector 20 years Experience person  he rejected one 24" pipe line  RT film   because of excessive penetration by measuring the dimension with a ruler and required the joint to be repaired..

This is Acceptable or Not Acceptable.

if Acceptable where is mentioned the code?

Please clarify me, Because my management take this issue very serious  

Best Regards 

Dominic V.K.

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Regards

BABUR KHAN LASHARI

Welding Inspector

(QA/QC)

SATORP (JERP)

Mob: +966 (0) 56 2179280

         +92334 6186285  

Skype Id : babur.lashari

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