Re: [MW:13339] Hydro testing failure

Dear Mr. Shankar,

 

The porosity can be caused, by the following causes;

1) dirty or not clean piping or filler rod

2) unsufficient gasprotection  from the torch

3) unsufficient backing gas

other causes may be excluded.

 

best regards,

 

Dick Overkleeft

2011/12/27 Dinesh Ravi Shankar <dinesh_ravi2001@yahoo.com>

Thank you jesti.

 

I already verified PMI reports,but it is 2" line so we cannot check pmi under root pass.& may be after 2/3 days RT taken after welding.

 

yes thru PT one round indication found on capping...after some grinding also its going like pin hole. thats y i m asking that in GTAW process,how pin holes will occur..? we have to avoid such a things during welding. 

 

Thank you & Best Regards,

S. Dinesh Ravi Shankar.
Mechanical Inspector,
Saudi Aramco Project Inspection Division (SAPID),
Manifa Core Hydrocarbon Facilities Project.

Kingdom of Saudi Arabia.,

Mobile : +966 562944695,

Tel      : +966 3 379 2018.

 

  
 

From: jesti fer <jesti_fer@yahoo.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Tuesday, December 27, 2011 8:05 AM
Subject: Re: [MW:13320] Hydro testing failure

Dear Mr. Shankar,

Is it possible to check the PMI in root weld, (the welder may use CS filler wire for root pass) and what is the time duration between completion welding and RT. You are getting any indication in PT?

 

Best regards

K>M>H

From: Muhammad Ashraf <mohdashrafr@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, December 26, 2011 1:35 PM
Subject: Re: [MW:13313] Hydro testing failure

IT MIGHT BE DUE TO (Microbiologically Influenced Corrosion) MIC. LET ME KNOW IF YOU HAVE CARRIED OUT FLUSHING AFTER HYDROTEST AS RESIDUAL WATER, AT LOW POINTS IN THE 300 SERIES PIPING, LEADS TO SUCH FAILURES.

 

 

RANA

 

 

On Mon, Dec 26, 2011 at 8:57 AM, Dinesh Ravi Shankar <dinesh_ravi2001@yahoo.com> wrote:

 Thank you Mr.Karanth for excellent information.

 

Anyway as per catagory we cannot cover 100% RT,but we have to avoid such a things during welding.In GTAW process,how pin holes will occur..?

 

Dinesh.

   

From: shankar narayan karanth <karanthequipments@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, December 25, 2011 4:57 PM
Subject: Re: [MW:13308] Hydro testing failure

Dear Shankar,

  It looks that there are pin holes  which you might have considered them to be rounded indication with in the limits of acceptance while Radiography interpretation.When optical density of rounded indication is quite high, you have to suspect them to be pin holes and had you carried PT on them it is quite likely that you have detected the defects.It is quite likely that very small rounded indications may not get picked up while carrying out MT. Hope this has answered your query.

P.S.Karanth
98251 29987

On Sun, Dec 25, 2011 at 5:41 PM, Dick Overkleeft <dick.overkleeft@gmail.com> wrote:

Dear Mr. Shankar,

 

Could you please sent some more information?

Can you inform us what kind of stainless steel you applied.

What welding process you used, and which filler material.

Is it plate or tube welding.

What kind of water ( is there any chlorid in the water) did you use for hydrotesting and did you air test before hydrotesting.

What kind of defects did you see on the X-ray?

 

After this we might be able to give an answer on your question.

 

bets regards,

 

Dick Overkleeft EWE

Bureau Veritas

2011/12/24 Dinesh Ravi Shankar <dinesh_ravi2001@yahoo.com>

 

Dear friends,

 

During hydro testing of stainless steel, recently 2 tests leak occurred at welded joint area. I verified RT films, PMI reports...etc.Just I want to find root cause.

 

Please advise me that what proactive surveillance need to take of further hydro test failure & how it is happening..?

 

 

 

Thank you & Best Regards,

S. Dinesh Ravi Shankar.
Mechanical Inspector,
Saudi Aramco Project Inspection Division (SAPID),
Manifa Core Hydrocarbon Facilities Project.

Kingdom of Saudi Arabia.,

Mobile : +966 568059765,
Tel      : +966 3 379 2018.

 

  

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