Skip to main content

Re: [MW:13320] Hydro testing failure

By Materials & Welding
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.
 
  
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.


--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.


Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more