Monday, June 23, 2008

[MW:881] clarification reg root gap

It appears that the problem is with the mismatch / ovality and not with the root gap, with 1.5 or 2.0mm root gap or equal to dia of filler wire used (which normally we recommend on paper) you can achieve a good weld penetration, but practically, when you start welding with a 2mm root gap and finishes 180° the root gap will close to zero due to distortion during welding the other half.

That is why most welders prefer wider root gap than recommended, and it should left to welder judiciously (of course all welders can’t be same and depends on their skill), you can try out few joints with various root gaps.

You can overcome with it by using pipe clamps for fit up.

 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Anil Kumar
Sent: Sunday, June 22, 2008 3:17 PM
To: materials-welding@googlegroups.com
Subject: [MW:880] clarification reg root gap

 

Dear Friends,

My Name is Anil Kumar working as a Quality Control Inspector in Qatar, for Decon for an Oil Refinery project. I Joined the company recently and during my regular visits to site and also reviewing various data sheets I found that most of the defects are Root undercut, LOP and LOF, the welding used for the production is TIG welding with 2.4mm filler wires for all SS, CS and LTCS materials the Dia of the pipes ranges from 2inch to 24 inch and yeah there is lot of problem with the material reg the mismatch and ovality in the pipe apart from this another prob I observe that the root gap used for the welding is mostly 4+ mm for all the joints , I strongly recommended for 2.5 to 3.5 mm at the max for the Root gap but some of the welders complaining that they are finding difficulty in moving the electrode.

I request you to kindly suggest me what is the root gap for the above said materials and what are the other possibilities for the above said repairs and the corrective action required to be taken for the same.

I thank you one and all very much for creating such a beautiful group

 

Thanking you,

 

Regards

Bathula Anil Kumar

Visakhapatnam




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Sunday, June 22, 2008

[MW:880] clarification reg root gap

Dear Friends,

My Name is Anil Kumar working as a Quality Control Inspector in Qatar, for Decon for an Oil Refinery project. I Joined the company recently and during my regular visits to site and also reviewing various data sheets I found that most of the defects are Root undercut, LOP and LOF, the welding used for the production is TIG welding with 2.4mm filler wires for all SS, CS and LTCS materials the Dia of the pipes ranges from 2inch to 24 inch and yeah there is lot of problem with the material reg the mismatch and ovality in the pipe apart from this another prob I observe that the root gap used for the welding is mostly 4+ mm for all the joints , I strongly recommended for 2.5 to 3.5 mm at the max for the Root gap but some of the welders complaining that they are finding difficulty in moving the electrode.

I request you to kindly suggest me what is the root gap for the above said materials and what are the other possibilities for the above said repairs and the corrective action required to be taken for the same.

I thank you one and all very much for creating such a beautiful group

 

Thanking you,

 

Regards

Bathula Anil Kumar

Visakhapatnam



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[MW:879] Re: 867] pressure testing - with attachment

Please refer para B 31.3 345.9 where it is clearly mentioned that the
conditions are stated in 345.1(c). And in 345.1(c) refers that both
the conditions (1) & (2) must be fulfilled to waive a hydrotest.
In general, testing in manufacturers premises are not normally taken
care unless it is witnessed by the purchaser and that is also for
specific requirements.

RB

On Jun 20, 11:12 pm, "Tirumala B N Tagore" <tagore....@gmail.com>
wrote:
> If the pipe is procured as per  materials pecification and  duly hydro
> tested at mills and  pipe line segments are tested individually at works ,
> then field NDE would suffice and  end user  may waive off field hydro test.
> exception to this is any PWHT for field welds done , in such cases exception
> to Hydro test/ Pneumatric test is not recommended.
> Pneumatic test can be done in lieu of  Hydro test subjected to proper
> precautions, tieing in at various locations are done for safety reasons
> based on energy calculations.
> Tagore
>
>
>
> On Thu, Jun 19, 2008 at 10:53 PM, Rituraj Bose <boser2...@gmail.com> wrote:
>
> > Dear Mr. Subramanium,
>
> > Please note that RT or any NDT cannot replace Hydro or Pneumatic test.
> > It can only certify the welded joint, not the whole pipe line.
>
> > R. Bose
>
> > On Jun 16, 10:21 am, "shiva.subramanium" <shiva.subraman...@wsiko.com>
> > wrote:
> > > Dear Members, Mr. Surya and Mr. Raghuram
>
> > > Due to water problem, you cannot go for pneumatic test based on TP = 110%
> > of
> > > DP) because the hazard of energy release.
>
> > > Just calculate the pneumatic pressure for the system
>
> > > Hydrotest = 60 KG/cm2, so design pressure is around 40 Kg/cm2
>
> > > For pneumatic test, pressure shall be around 44 kg/cm2.
>
> > > Imagine the hazard of energy release with reference to the
> > > attachment(attached previous message of Criticality of Hydrotest pressure
> > vs
> > > pneumatic pressure)
>
> > > So, better you can go for 100% RT/UT for all Butt joints and PT/MPT for
> > > attachment weld as per B31.3 para 345.9.
>
> > > S. Siva Subramanian
> > > World Services Italia S.p.A., Kuwait Operations,
> > > P.O. Box : 28928 - Safat : 13151 - Kuwait.
> > > Tel : +965 3262945 / 3260338 / 3263987 / 3263691/92, Ext.\ 207
> > > Mobile - 00965 632 7395
> > > E-mail :  shiva.subraman...@wsiko.com
>
> > > -----Original Message-----
> > > From: materials-welding@googlegroups.com
>
> > > [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula
> > Raghuram
> > > (Mumbai - PIPING)
> > > Sent: Monday, June 16, 2008 10:44 AM
> > > To: materials-welding@googlegroups.com
> > > Subject: [MW:867] pressure testing
>
> > > Assuming your design code is B31.3, refer para 345 for the creteria (TP
> > > is 110% of DP)
>
> > > Also refer earlier message posted in this group titled  "Criticality of
> > > Pneumatic pressure test vs Hydrostatic on piping system"
> > > we should always remember that is necessary to evaluate
> > > the design aspects of material selection for piping lines to be
> > > submitted to pneumatic test: in these cases ASME B 31.3 require that the
> > > materials be guaranteed against their brittleness at the ambient
> > > temperature during pneumatic test.
> > > Typical cases are the plants where the ambient temperature could reach
> > > even minus 50^C (e.g. some parts of Russia).
>
> > > -----Original Message-----
> > > From: gajjalla surya prakash [mailto:gajja...@gmail.com]
> > > Sent: Monday, June 16, 2008 12:32 PM
> > > To: materials-welding@googlegroups.com
> > > Subject: pressure testing
>
> > > dear members,
>
> > > we are doing hydrotest for the piping systems and now facing the
> > > problem of water scarcity ,and our customer praposes to perform the
> > > pneumatic test .
>
> > > for example hydrotest pressure is 60kg/cm2 what should be the
> > > pneumatic pressure . where can we get this information.
>
> > > surya prakash gajjalla.
>
> > >  Scanned_ (2).pdf
> > > 141KDownload- Hide quoted text -
>
> > > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

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Saturday, June 21, 2008

[MW:878] FW: 876] Re: 867] pressure testing - with attachment

Dear Friends,

Sometimes even pneumatic test also is not the correct substitution. e.g,
Storage spheres, Mounded bullets etc.)

Regards,

S.Mathusoothanan,

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Rituraj Bose
Sent: 20 June, 2008 8:54 AM
To: Materials & Welding
Subject: [MW:876] Re: 867] pressure testing - with attachment


Dear Mr. Subramanium,

Please note that RT or any NDT cannot replace Hydro or Pneumatic test.
It can only certify the welded joint, not the whole pipe line.

R. Bose

On Jun 16, 10:21 am, "shiva.subramanium" <shiva.subraman...@wsiko.com>
wrote:
> Dear Members, Mr. Surya and Mr. Raghuram
>
> Due to water problem, you cannot go for pneumatic test based on TP = 110%
of
> DP) because the hazard of energy release.
>
> Just calculate the pneumatic pressure for the system
>
> Hydrotest = 60 KG/cm2, so design pressure is around 40 Kg/cm2
>
> For pneumatic test, pressure shall be around 44 kg/cm2.
>
> Imagine the hazard of energy release with reference to the
> attachment(attached previous message of Criticality of Hydrotest pressure
vs
> pneumatic pressure)
>
> So, better you can go for 100% RT/UT for all Butt joints and PT/MPT for
> attachment weld as per B31.3 para 345.9.
>
> S. Siva Subramanian
> World Services Italia S.p.A., Kuwait Operations,
> P.O. Box : 28928 - Safat : 13151 - Kuwait.
> Tel : +965 3262945 / 3260338 / 3263987 / 3263691/92, Ext.\ 207
> Mobile - 00965 632 7395
> E-mail :  shiva.subraman...@wsiko.com
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram
> (Mumbai - PIPING)
> Sent: Monday, June 16, 2008 10:44 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:867] pressure testing
>
> Assuming your design code is B31.3, refer para 345 for the creteria (TP
> is 110% of DP)
>
> Also refer earlier message posted in this group titled  "Criticality of
> Pneumatic pressure test vs Hydrostatic on piping system"
> we should always remember that is necessary to evaluate
> the design aspects of material selection for piping lines to be
> submitted to pneumatic test: in these cases ASME B 31.3 require that the
> materials be guaranteed against their brittleness at the ambient
> temperature during pneumatic test.
> Typical cases are the plants where the ambient temperature could reach
> even minus 50^C (e.g. some parts of Russia).
>
> -----Original Message-----
> From: gajjalla surya prakash [mailto:gajja...@gmail.com]
> Sent: Monday, June 16, 2008 12:32 PM
> To: materials-welding@googlegroups.com
> Subject: pressure testing
>
> dear members,
>
> we are doing hydrotest for the piping systems and now facing the
> problem of water scarcity ,and our customer praposes to perform the
> pneumatic test .
>
> for example hydrotest pressure is 60kg/cm2 what should be the
> pneumatic pressure . where can we get this information.
>
> surya prakash gajjalla.
>
>
>
>  Scanned_ (2).pdf
> 141KDownload- Hide quoted text -
>
> - Show quoted text -

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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.
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Friday, June 20, 2008

[MW:877] Re: 867] pressure testing - with attachment

If the pipe is procured as per  materials pecification and  duly hydro tested at mills and  pipe line segments are tested individually at works , then field NDE would suffice and  end user  may waive off field hydro test. exception to this is any PWHT for field welds done , in such cases exception to Hydro test/ Pneumatric test is not recommended.
Pneumatic test can be done in lieu of  Hydro test subjected to proper precautions, tieing in at various locations are done for safety reasons  based on energy calculations.
Tagore

On Thu, Jun 19, 2008 at 10:53 PM, Rituraj Bose <boser2006@gmail.com> wrote:

Dear Mr. Subramanium,

Please note that RT or any NDT cannot replace Hydro or Pneumatic test.
It can only certify the welded joint, not the whole pipe line.

R. Bose

On Jun 16, 10:21 am, "shiva.subramanium" <shiva.subraman...@wsiko.com>
wrote:
> Dear Members, Mr. Surya and Mr. Raghuram
>
> Due to water problem, you cannot go for pneumatic test based on TP = 110% of
> DP) because the hazard of energy release.
>
> Just calculate the pneumatic pressure for the system
>
> Hydrotest = 60 KG/cm2, so design pressure is around 40 Kg/cm2
>
> For pneumatic test, pressure shall be around 44 kg/cm2.
>
> Imagine the hazard of energy release with reference to the
> attachment(attached previous message of Criticality of Hydrotest pressure vs
> pneumatic pressure)
>
> So, better you can go for 100% RT/UT for all Butt joints and PT/MPT for
> attachment weld as per B31.3 para 345.9.
>
> S. Siva Subramanian
> World Services Italia S.p.A., Kuwait Operations,
> P.O. Box : 28928 - Safat : 13151 - Kuwait.
> Tel : +965 3262945 / 3260338 / 3263987 / 3263691/92, Ext.\ 207
> Mobile - 00965 632 7395
> E-mail :  shiva.subraman...@wsiko.com
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram
> (Mumbai - PIPING)
> Sent: Monday, June 16, 2008 10:44 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:867] pressure testing
>
> Assuming your design code is B31.3, refer para 345 for the creteria (TP
> is 110% of DP)
>
> Also refer earlier message posted in this group titled  "Criticality of
> Pneumatic pressure test vs Hydrostatic on piping system"
> we should always remember that is necessary to evaluate
> the design aspects of material selection for piping lines to be
> submitted to pneumatic test: in these cases ASME B 31.3 require that the
> materials be guaranteed against their brittleness at the ambient
> temperature during pneumatic test.
> Typical cases are the plants where the ambient temperature could reach
> even minus 50^C (e.g. some parts of Russia).
>
> -----Original Message-----
> From: gajjalla surya prakash [mailto:gajja...@gmail.com]
> Sent: Monday, June 16, 2008 12:32 PM
> To: materials-welding@googlegroups.com
> Subject: pressure testing
>
> dear members,
>
> we are doing hydrotest for the piping systems and now facing the
> problem of water scarcity ,and our customer praposes to perform the
> pneumatic test .
>
> for example hydrotest pressure is 60kg/cm2 what should be the
> pneumatic pressure . where can we get this information.
>
> surya prakash gajjalla.
>
>
>
>  Scanned_ (2).pdf
> 141KDownload- Hide quoted text -
>
> - Show quoted text -




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[MW:874] Info on access to this group on web

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For Gmail subscribers

 

Just click the above link and use your Google ID and password if have subscribed with your gmail

 

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From: Prashant Barodia [mailto:ppbdhatumitra@yahoo.co.in]
Sent: Friday, June 20, 2008 1:02 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:873] RE: 872] Welding Tolerance

 

Dear Sir,

 

any body advise e how to login in this? 

Warm Regards,

Prashant P Barodia

 

Cell No: +919825121539

Dhatu Mitra Engineers,
D-39, Vedashrya Duplex,
Nr. Mother's School,
ISKON Temple road,
Vadodara. 390015.







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[MW:876] Re: 867] pressure testing - with attachment

Dear Mr. Subramanium,

Please note that RT or any NDT cannot replace Hydro or Pneumatic test.
It can only certify the welded joint, not the whole pipe line.

R. Bose

On Jun 16, 10:21 am, "shiva.subramanium" <shiva.subraman...@wsiko.com>
wrote:
> Dear Members, Mr. Surya and Mr. Raghuram
>
> Due to water problem, you cannot go for pneumatic test based on TP = 110% of
> DP) because the hazard of energy release.
>
> Just calculate the pneumatic pressure for the system
>
> Hydrotest = 60 KG/cm2, so design pressure is around 40 Kg/cm2
>
> For pneumatic test, pressure shall be around 44 kg/cm2.
>
> Imagine the hazard of energy release with reference to the
> attachment(attached previous message of Criticality of Hydrotest pressure vs
> pneumatic pressure)
>
> So, better you can go for 100% RT/UT for all Butt joints and PT/MPT for
> attachment weld as per B31.3 para 345.9.
>
> S. Siva Subramanian
> World Services Italia S.p.A., Kuwait Operations,
> P.O. Box : 28928 - Safat : 13151 - Kuwait.
> Tel : +965 3262945 / 3260338 / 3263987 / 3263691/92, Ext.\ 207
> Mobile - 00965 632 7395
> E-mail :  shiva.subraman...@wsiko.com
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com
>
> [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram
> (Mumbai - PIPING)
> Sent: Monday, June 16, 2008 10:44 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:867] pressure testing
>
> Assuming your design code is B31.3, refer para 345 for the creteria (TP
> is 110% of DP)
>
> Also refer earlier message posted in this group titled  "Criticality of
> Pneumatic pressure test vs Hydrostatic on piping system"
> we should always remember that is necessary to evaluate
> the design aspects of material selection for piping lines to be
> submitted to pneumatic test: in these cases ASME B 31.3 require that the
> materials be guaranteed against their brittleness at the ambient
> temperature during pneumatic test.
> Typical cases are the plants where the ambient temperature could reach
> even minus 50^C (e.g. some parts of Russia).
>
> -----Original Message-----
> From: gajjalla surya prakash [mailto:gajja...@gmail.com]
> Sent: Monday, June 16, 2008 12:32 PM
> To: materials-welding@googlegroups.com
> Subject: pressure testing
>
> dear members,
>
> we are doing hydrotest for the piping systems and now facing the
> problem of water scarcity ,and our customer praposes to perform the
> pneumatic test .
>
> for example hydrotest pressure is 60kg/cm2 what should be the
> pneumatic pressure . where can we get this information.
>
> surya prakash gajjalla.
>
>
>
>  Scanned_ (2).pdf
> 141KDownload- Hide quoted text -
>
> - Show quoted text -

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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
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[MW:875] Diffusible H2 content and Hydrogen cracking study


Here we need to consider a point is that basically these Cr-Mo steels
are used for high temperature applications along with creep
resistance. Therefore ,selection of welding consumbales are also
important and the responsibility of welding engineer with respect to
Strength,Chemical Composition,Service condition and application etc..
Hence, carbon steel electorde E6013 is not appropriate for welding cr-
mo steels beacause of above said reasons..

--
Regards

Vasanth
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[MW:873] RE: 872] Welding Tolerance

Yes you can, refer fig 328.4.3 in ASME B31.3 and/or ASME B16.25 (Butt welding ends)


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Zameer Mohammed
Sent: Thursday, June 19, 2008 1:16 PM
To: materials-welding@googlegroups.com
Subject: [MW:872] Welding Tolerance

 

Dear Friends,

We want to weld a 24'' SS PIPE A358 GR 321, 6.53 mm THK, to a Fitting / Pipe with same size and specification but with a Thickness of 9.53mm and 12.70 mm.

Can we do the welding of these items? What is the accepted tolerance as per ASME B31.3? Where can I find these details in ASME B313.3?

Thank you,

Regards,



Sabir


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Thursday, June 19, 2008

[MW:872] Welding Tolerance

Dear Friends,

We want to weld a 24'' SS PIPE A358 GR 321, 6.53 mm THK, to a Fitting / Pipe with same size and specification but with a Thickness of 9.53mm and 12.70 mm.

Can we do the welding of these items? What is the accepted tolerance as per ASME B31.3? Where can I find these details in ASME B313.3?

Thank you,

Regards,



Sabir
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Wednesday, June 18, 2008

[MW:871] Stainless pipes shipped without tests

5 June 2008 (Source: sswnews.com)

 

Nisshin Steel Co. confirmed that it had shipped 550,000 stainless steel pipes without conducting required non-destructive testing for detecting defects and tests for ability to withstand hydraulic pressure and air pressure. The Nisshin Steel plant in Amagasaki of the western Japan prefecture of Hyogo failed to carry out the testing, mandatory under Japanese Industrial Standards and fabricated test data for some steel pipes manufactured at the plant in the past five years. A Nisshin Steel in house investigation of test data found that a total of 480,665 stainless steel pipes were shipped without non-destructive inspections or tests on hydraulic pressure out of 4,311,205 subject to such tests. Tests were also not conducted on 71,756 stainless steel pipes of 2,485,458 subject to air pressure resistance testing. Nisshin Steel is the third Japanese steelmaker at which testing data fabrication has been revealed, following similar cases late May at JFE Steel Corp and Nippon Steel Corp.

 


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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.
-~----------~----~----~----~------~----~------~--~---

Monday, June 16, 2008

[MW:868] Re: pressure testing


In addition to the code,site condition and material issues, unfortunately the Process commissioning engineer has the final say if the line can be pressure tested by hydro/pneumatic/any other liquid, as they define the type of test to be performed for that fluid process system...not a construction or material engineer.

The apex person to over rule all these is the plant owner's process engineer.

So there is every possiblity that the line need not been performed with any kind of pressure test at all with the right knowledge of the process/piping system. So pnuematic in lieu of hydro due to scarcity of water may not be justified for acceptance, though both tests are intended to ensure the integrity of the system as a whole and of all types of joints of the system.

With regards,
Kannan.




"Bathula Raghuram \(Mumbai - PIPING\)" <R.Bathula@ticb.com>
Sent by: materials-welding@googlegroups.com

16/06/2008 09:43

Please respond to
materials-welding@googlegroups.com

To
<materials-welding@googlegroups.com>
cc
Subject
[MW:867] pressure testing






Assuming your design code is B31.3, refer para 345 for the creteria (TP
is 110% of DP)

Also refer earlier message posted in this group titled  "Criticality of
Pneumatic pressure test vs Hydrostatic on piping system"
we should always remember that is necessary to evaluate
the design aspects of material selection for piping lines to be
submitted to pneumatic test: in these cases ASME B 31.3 require that the
materials be guaranteed against their brittleness at the ambient
temperature during pneumatic test.
Typical cases are the plants where the ambient temperature could reach
even minus 50^C (e.g. some parts of Russia).

-----Original Message-----
From: gajjalla surya prakash [mailto:gajjalla@gmail.com]
Sent: Monday, June 16, 2008 12:32 PM
To: materials-welding@googlegroups.com
Subject: pressure testing


dear members,


we are doing hydrotest for the piping systems and now facing the
problem of water scarcity ,and our customer praposes to perform the
pneumatic test .


for example hydrotest pressure is 60kg/cm2 what should be the
pneumatic pressure . where can we get this information.



surya prakash gajjalla.


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[MW:870] RE: 867] pressure testing - with attachment

Dear Members, Mr. Surya and Mr. Raghuram

Due to water problem, you cannot go for pneumatic test based on TP = 110% of
DP) because the hazard of energy release.

Just calculate the pneumatic pressure for the system

Hydrotest = 60 KG/cm2, so design pressure is around 40 Kg/cm2

For pneumatic test, pressure shall be around 44 kg/cm2.

Imagine the hazard of energy release with reference to the
attachment(attached previous message of Criticality of Hydrotest pressure vs
pneumatic pressure)

So, better you can go for 100% RT/UT for all Butt joints and PT/MPT for
attachment weld as per B31.3 para 345.9.


S. Siva Subramanian
World Services Italia S.p.A., Kuwait Operations,
P.O. Box : 28928 - Safat : 13151 - Kuwait.
Tel : +965 3262945 / 3260338 / 3263987 / 3263691/92, Ext.\ 207
Mobile - 00965 632 7395
E-mail : shiva.subramanium@wsiko.com

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram
(Mumbai - PIPING)
Sent: Monday, June 16, 2008 10:44 AM
To: materials-welding@googlegroups.com
Subject: [MW:867] pressure testing


Assuming your design code is B31.3, refer para 345 for the creteria (TP
is 110% of DP)

Also refer earlier message posted in this group titled "Criticality of
Pneumatic pressure test vs Hydrostatic on piping system"
we should always remember that is necessary to evaluate
the design aspects of material selection for piping lines to be
submitted to pneumatic test: in these cases ASME B 31.3 require that the
materials be guaranteed against their brittleness at the ambient
temperature during pneumatic test.
Typical cases are the plants where the ambient temperature could reach
even minus 50^C (e.g. some parts of Russia).

-----Original Message-----
From: gajjalla surya prakash [mailto:gajjalla@gmail.com]
Sent: Monday, June 16, 2008 12:32 PM
To: materials-welding@googlegroups.com
Subject: pressure testing


dear members,


we are doing hydrotest for the piping systems and now facing the
problem of water scarcity ,and our customer praposes to perform the
pneumatic test .


for example hydrotest pressure is 60kg/cm2 what should be the
pneumatic pressure . where can we get this information.

surya prakash gajjalla.


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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.
-~----------~----~----~----~------~----~------~--~---

[MW:867] pressure testing

Assuming your design code is B31.3, refer para 345 for the creteria (TP
is 110% of DP)

Also refer earlier message posted in this group titled "Criticality of
Pneumatic pressure test vs Hydrostatic on piping system"
we should always remember that is necessary to evaluate
the design aspects of material selection for piping lines to be
submitted to pneumatic test: in these cases ASME B 31.3 require that the
materials be guaranteed against their brittleness at the ambient
temperature during pneumatic test.
Typical cases are the plants where the ambient temperature could reach
even minus 50^C (e.g. some parts of Russia).

-----Original Message-----
From: gajjalla surya prakash [mailto:gajjalla@gmail.com]
Sent: Monday, June 16, 2008 12:32 PM
To: materials-welding@googlegroups.com
Subject: pressure testing


dear members,


we are doing hydrotest for the piping systems and now facing the
problem of water scarcity ,and our customer praposes to perform the
pneumatic test .


for example hydrotest pressure is 60kg/cm2 what should be the
pneumatic pressure . where can we get this information.

surya prakash gajjalla.

--~--~---------~--~----~------------~-------~--~----~
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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.
-~----------~----~----~----~------~----~------~--~---

[MW:869] pressure testing

dear members,


we are doing hydrotest for the piping systems and now facing the
problem of water scarcity ,and our customer praposes to perform the
pneumatic test .


for example hydrotest pressure is 60kg/cm2 what should be the
pneumatic pressure . where can we get this information.

surya prakash gajjalla.

--~--~---------~--~----~------------~-------~--~----~
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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.
-~----------~----~----~----~------~----~------~--~---

Sunday, June 15, 2008

[MW:866] Re: API 5L Material poperties

for mechanical  properties ref: API 5L (2000) line pipe specifications,6.1 and 6.2

 

Babu.P.R

--- On Fri, 6/13/08, asmat ullah <aubajwa@gmail.com> wrote:

From: asmat ullah <aubajwa@gmail.com>
Subject: [MW:861] API 5L Material poperties
To: "Materials & Welding" <materials-welding@googlegroups.com>
Date: Friday, June 13, 2008, 4:16 AM

Hi friend,  could any body let me know where i can find mechanical properties (other than tensile and yield strength) of API 5L A, B, X42, X52, X60.., .....material?  I am interested in properties like poisson ratio, modulus of elasticity (young's modulus)... etc..  please help  Best Regards, Asmat Ullah          
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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.
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Saturday, June 14, 2008

[MW:865] PED Harmonised Standard for Design

Just the below link for more information, interesting one
http://www.unm.fr/en/general/en13445/

published hormonised stanadrds for Directive 97/23/EEC can be seen at
http://ec.europa.eu/enterprise/newapproach/standardization/harmstds/reflist/equippre.html
and
http://www.newapproach.org/Directives/ProductFamilies.asp?97/23/EC

The attached list contains references to harmonised standards for pressure equipment and harmonised supporting standards for materials used in manufacturing pressure equipment.

The follwoing pretext taken from a CEN link may be helpful
A harmonised standards is a standard considered by the European Commission as satisfying some of the directives essential safety requirements.

Harmonised standards are covered by three types of European Standard:-

* Harmonised Product Standards
These are application codes that cover the design and manufacture of Pressure Vessels, Boilers and Pipework

* Harmonised Support Standards
Welding, NDT and other standards that supplement the application codes.

* Harmonised Material Standards
A material specified in a harmonised standard will satisfy the requirements of the directive in terms of ductility, toughness and strength but does not guarantee that the material will be suitable for a specific application.


Each harmonised standard will contain an annex stating which essential safety requirements it satisfies. The advantage of using these standards is that no additional justification is required that essential safety requirements have been met and providing the standards have been correctly applied the design of the equipment can not be challenged.

Another advantage of using Harmonised Standards is that they provide an interpretation of the directive. For example if a pressure vessel is to operate below zero the impact tests on the material and welding procedures have to be carried out the lowest operating temperature the vessel will experience according to ESR 7.5. This is not current practice as far as either PD5500 or ASME VIII is concerned as both these standards permit, under certain circumstances, warmer impact test temperatures.

Harmonised Standards are not essential, any appropriate standard can used but the satisfaction of essential safety requirements must proved. Both PD5500 and ASME VIII have produced annexes stating how and which essential safety requirements they claim to satisfy, these annexes have not been approved by the European commission and therefore neither standard can claim to be harmonised.

Note PD5500 has nothing to do with the PED, it is simply the latest revision of BS5500, it no longer has the status of a British Standard because it will conflict with BSEN13445. It is now a Published Document rather than a standard, This will make no difference to it as it will continue to be supported as long as its popularity remains

The harmonised standard for the qualification of welding personnel is EN ISO 9606, for operating procedures it is EN ISO 15614. (Note EN ISO 15614 only satisfies the requirements of E.S.R 3.1.2 it does not satisfy the requirements for welding consumables stated in E.S.R 4)


-----Original Message-----
From: PED2000@googlegroups.com on behalf of Rajesh
Sent: Sat 14/06/2008 17:37
To: Process Equipment Design
Cc: estamd@graphiteindia.com
Subject: [PED:93] PED Harmonised Standard for Design

Dear All,

I undrstand that Harmonised Standard For pressure vessel design for
PED is being published. BSEN13445. I have some querries.

- If this help us in selection of material.
- When this standard is likely to be published.

Regrads

Rajesh

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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.
-~----------~----~----~----~------~----~------~--~---

Friday, June 13, 2008

[MW:864] Re: Site welding & heat treatment for ASTM A 387 Gr 22 CL1

Best would be provide electrical heating pads for the joints so that the minimum preheat can be maintained during the entire welding cycle




Date: Wed, 11 Jun 2008 23:30:04 -0700
From: tagore.tbn@gmail.com
To: materials-welding@googlegroups.com
Subject: [MW:860] Re: Site welding & heat treatment for ASTM A 387 Gr 22 CL1

Basically Cr-Mo steels need Pre heating and  post heating when ever there are breaks for lunch, tea , shift changes. Interpass temperature maintenance is a MUST . Therfore even in site , the whole weld zone shall be in an enclosed environment so that there are no wind  effects . For that matter any welding in an open wind environment is not advised.
Regards,
Tagore

On Wed, Jun 11, 2008 at 8:15 PM, <Sudipto_Banerjee@fwuk.fwc.com> wrote:

Pls. let me know if there should be any potential concerns of a reactor
made of ASTM A 387 Gr 22 CL1 in SITE ASSEMBLY with regards to welding, site
heat treatments and others.
If there is, then pls. let me know what are the points to be taken care by
the vendor.

Thanking you.


Best Regards,
Sudipto Banerjee
Man. no. B 4512
Equipment Engg. Department
Office no. 0091-(0)44-6622 2947
Mobile 1 (official) : 0044- 0 7733287865
Mobile 2 (personal) : 0091-9930005960


=======================================================
Confidentiality Notice

This communication and the information it contains:-
(a) Is intended for the person(s) or organisation(s) named above and for no other person(s) or organisation(s).
(b) May be confidential, legally privileged and protected in law. Unauthorised use, copying or disclosure of any of it may be unlawful. If you have received this communication in error, please contact us immediately by email at Postmaster@fwuk.fwc.com.
=======================================================





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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.
-~----------~----~----~----~------~----~------~--~---

[MW:863] Re: [MW:821]


Dear Paresh,
 
How are you & your family?
 
Warm regards,

Gurudas D. Madye

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-~----------~----~----~----~------~----~------~--~---

[MW:862] RE: 861] API 5L Material properties

Modulus of elasticity is direct relation of stress vs strain, that you need to calculate based on the load acting on that object.

Similar way poisson ratio also comes from displacement strain, that is what I remember from the text we read few decades back at college, thou I have never used it in my career till now.

I don't know(think) there will a fixed value for the grades mentioned below, members please share really is there any tabulated values (possible) in any of the hand books.

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of asmat ullah
Sent: Friday, June 13, 2008 4:16 AM
To: Materials & Welding
Subject: [MW:861] API 5L Material poperties

 

Hi friend,

 

could any body let me know where i can find mechanical properties

(other than tensile and yield strength) of API 5L A, B, X42, X52,

X60.., .....material?

 

I am interested in properties like poisson ratio, modulus of

elasticity (young's modulus)... etc..

 

please help

 

Best Regards,

Asmat Ullah

 

 


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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.
-~----------~----~----~----~------~----~------~--~---

[MW:861] API 5L Material poperties

Hi friend,

could any body let me know where i can find mechanical properties
(other than tensile and yield strength) of API 5L A, B, X42, X52,
X60.., .....material?

I am interested in properties like poisson ratio, modulus of
elasticity (young's modulus)... etc..

please help

Best Regards,
Asmat Ullah

--~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

Thursday, June 12, 2008

17-4PH cracking.


People involved in the valve application, take care before placing order to know the component materials of the valve. The 17-4PH usually used in the stem construction have failed like the below. Tyco valves has observed similar failures in thier inhouse research and has reported the same on using 17-4PH. And are not recommending this material unless specifically asked for.

As all suppliers and buyers do not take much interest in the small components of the valve, it will be the responsibility of the buyer to take note of these before ordering and the complete knowledge of the service involved. Alternatives would be FXM19, F51, F6a Cl4 depending on temp. and service.(17-4PH is 17Cr-4Ni-Pricipatation Hardened)

http://www.hghouston.com/x/25.html

(Photo attached for members not having net access.)



Nomarski intereference contrast photograph of the microstructure of a 17-4PH stainless steel sleeve bearing overlayed with sintered tungsten carbide. A hydrogen embrittlement crack has initiated at the overlay/base metal interface. A mechanical crack in the overlay permitted access of a corrosive downhole environment to the 17-4PH stainless steel base metal. Vilellla's etch. (~65X)

With regards,
Kannan.

[MW:860] Re: Site welding & heat treatment for ASTM A 387 Gr 22 CL1

Basically Cr-Mo steels need Pre heating and  post heating when ever there are breaks for lunch, tea , shift changes. Interpass temperature maintenance is a MUST . Therfore even in site , the whole weld zone shall be in an enclosed environment so that there are no wind  effects . For that matter any welding in an open wind environment is not advised.
Regards,
Tagore

On Wed, Jun 11, 2008 at 8:15 PM, <Sudipto_Banerjee@fwuk.fwc.com> wrote:

Pls. let me know if there should be any potential concerns of a reactor
made of ASTM A 387 Gr 22 CL1 in SITE ASSEMBLY with regards to welding, site
heat treatments and others.
If there is, then pls. let me know what are the points to be taken care by
the vendor.

Thanking you.


Best Regards,
Sudipto Banerjee
Man. no. B 4512
Equipment Engg. Department
Office no. 0091-(0)44-6622 2947
Mobile 1 (official) : 0044- 0 7733287865
Mobile 2 (personal) : 0091-9930005960


=======================================================
Confidentiality Notice

This communication and the information it contains:-
(a) Is intended for the person(s) or organisation(s) named above and for no other person(s) or organisation(s).
(b) May be confidential, legally privileged and protected in law. Unauthorised use, copying or disclosure of any of it may be unlawful. If you have received this communication in error, please contact us immediately by email at Postmaster@fwuk.fwc.com.
=======================================================





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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.
-~----------~----~----~----~------~----~------~--~---

[MW:859] Re: 835] Re: Clarification on Heat treatment / PWHT -Reg.

For Cr -Mo steels the most important factor is the tempering temperature of  the procured  materials. If he materials are procured in Normalized & tempered condition, and  if the PWHT temperature as occured is lesser than the TEMPERED temp. of the procured state , then it should pass the mechnaical tests . As suggested by mr.Sachin, PQR needs to be established and  at the same time the parent materials also needs to be tested for tensile, yield in general and  impact test if  the specification of  project vis-a-vis MDMT call so.

Regards,
tagore

On Wed, Jun 11, 2008 at 8:47 AM, Muhammed Ibrahim <ibratech@gmail.com> wrote:

Dear Sachin,
 
Code says about the increase or decrease of time at a temperature. atleast 80 percent of the PQR shall be in production. I am not clear about the time it discuss.
 
2008/6/11 sachin sankhe <sachin.sankhe@rediffmail.com>:

 
Dear Rishi,

Hardness wont be suffucient to accept since we have changed grain structure to certain extent by exceding PWHT temp.resulting in change in mechanical properties.

In that case you need to re-qualify the procedure with new PWHT temperature and all mechanical test to be done as per relevant specification requirement.
If the test passes then we can accept the production joint
If it fails then analysis of failure to be done and results to be conveyed to client.
Based on criticality of the job,let client decide wether to reject or do PHWT gain.
If they propose PWHT again then subsequently we have to qualify procedure with 2 times PWHT.

OTHER MEMBERS ARE ALSO WELCOME TO GIVE THEIR OPINION.

Regards
Sachin.Sankhe


On Wed, 11 Jun 2008 Singh Rishi Raj(Tasnee Site) wrote :


>Dear Friends,
>
>Staying with the subject line of heat treatment, I wanted to know (since
>long ) --------
>
>
>
>What should be done if the temperature while doing PWHT exceeds the
>range mentioned in WPS ??
>
>
>
>For example lets say-
>
>A weld between A335 P11 ( P 4  Gr 1) , thickness 17mm.  WPS ( & B 31.3
>) has the PWHT temp as 704-746 deg C.
>
>If the temp of  PWHT cycle exceeds the higher value by 40deg.
>Centigrade, what should be done?
>
>Can the joint be accepted based on the hardness value?
>
>
>
>Please also provide references with your answer.
>
>
>
>Best Regards,
>
>Rishi Raj Singh
>
>________________________________
>
> From: materials-welding@googlegroups.com
>[mailto:materials-welding@googlegroups.com] On Behalf Of Prabhakar h
>Sent: 09 June 2008 16:25
>To: materials-welding@googlegroups.com
>Subject: [MW:835] Re: Clarification on Heat treatment-Reg.
>
>
>
>Dear Shabbir,
>
>
>
>Thanks a lot for your prompt response and sorry even i cud not catch up
>quite a while as i was held up with my ASME Audits.
>
>
>
>Your Explanation was usefull and it would be better if you cud tell us
>at what conditions we go for the HT and how the same is selected???
>
>
>
>Prabhakar.H
>
>
>
>On 5/4/08, shabbir ahmad <shabbir.ahmad7@gmail.com> wrote:
>
>Dear Prabhakar,
>
>
>
>Nortmalizing: The steel is heated 50 deg. cent grade beyond the upper
>critical tempreture( generally 900 to 940), once the calculated soaking
>time has elapsed the steel is removed from the furnce to cool in still
>air, This produce smaller n fine grain structure that has high toughness
>n strength.In short u can say normalizung makes steel tougher n strong.
>
>
>
>Stress Reliving: Steel heated upto 550-650 d.c..The plastic flow of
>sresses increased as tempr. rises, relieving locked in elastic residual
>welding stress.
>
>
>
>Tempering: The steel is re-heated after hardening and the balance of
>hardness & toughness is adjusted as the temp range 200 - 723deg. cent.
>
>
>
>at 723 d.c. all the martensite has been tempered removing the
>brittleness 7 returning the toughness and some ductility. Normally
>tempering carried out to rebalance the propertied of thermally hardened
>steels.
>
>
>
>solution Annealing : generally carried out on Stainless steel, this
>produces large n coarse grain.Heating the steel above 1040 deg.centi
>grade and quench in oil.
>
>
>
>Thanks
>
>
>
>shabbir
>
>
>
>On 5/3/08, Prabhakar h <hb.prabhakar@gmail.com> wrote:
>
>
>
>      Dear all,
>
>
>
>      Can anyone let me know what is the difference bet'n
>Normallising/Stress releiving/Tempering/Solution anneling..
>
>
>
>      I always get confussed and cudnt get a better idea....
>
>
>
>      Is there anyone to help it out....?
>
>
>
>      Prabhakar.H
>
>      </div
>
>
>>

Sachin.Sankhe
Engineer-Inspection
Aker Kvaerner-Malaysia
Mobile:012-2896901
Email1:Sachin.Sankhe@akerkvaerner.com
Email2:Sachin.sankhe@rediffmail.com


Amity



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[MW:858] 857] Diffusible H2 content and Hydrogen cracking study

Dear Mr.Ragu,

Thanks for warning me. I just forget that Codes & standards should not be
copied in any form.

Thanks once again.

Regards,

S.Mathusoothanan

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram
(Mumbai - PIPING)
Sent: 12 June, 2008 8:01 AM
To: materials-welding@googlegroups.com
Subject: [MW:857] Diffusible H2 content and Hydrogen cracking study


Dear Mr Mathusoothanan

Apriciate your posting, but I have to approve this message without the
attchements, since it is agianst the rules of this group (and all
members are requested to not post any codes/standards as attachements
in the group)

Thanking you for your co operation!

-----Original Message-----
From: mathu.subramanian [mailto:mathu.subramanian@kharafinational.com]
Sent: Thursday, June 12, 2008 10:20 AM
To: materials-welding@googlegroups.com
Subject: 851] Diffusible H2 content and Hydrogen cracking study

Dear friend,

E6013 is not the compatible electrode to weld Cr-Mo steels and it is
normal
carbon steel electrode. In Cr-Mo steels so many grades are there. Gr.1,
Gr.11, Gr.22, Gr.5, Gr.9, Gr.91. Please refer attached ASME Specs for
Electrodes & Materials. According to grade of material welding
electrodes is
to be selected.

As said by Mr Raghuram, two different AWS classifications can not be
compared for
diffusible hydrogen level. Two hydrogen levels of same AWS
classification
should be selcted.

I think the material grade you have selected might be Grade 9.

Regards.

S.Mathusoothanan

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula
Raghuram
(Mumbai - PIPING)
Sent: 12 June, 2008 6:31 AM
To: materials-welding@googlegroups.com
Subject: [MW:851] Diffusible H2 content and Hydrogen cracking study


What type of Cr-Mo steel it is?
What is the basis of selecting E6013 for Cr-Mo steel?
Why diffusion hydrogen level required for E6013, when it is not a low
hydrogen electrode?
One can't compare the stress value with two different AWS
classifications; instead you can study by taking two different batches
of E9015B9 electrodes with different diff H2 levels (not comparing with
E6013) and test it!

Members please share your thoughts

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of mech
Sent: Wednesday, June 11, 2008 7:49 PM
To: Materials & Welding
Subject: [MW:846] on preheating effect


dear sir
i am a welding engg student and doing project on hydrogen cracking
of cr-mo steel by using implant test method.
the following result were observed

electrode diff hydrogen
level critical stress

E6013 (ruttile type) 5
ml 456 mpa
E9015 B9
10.6ml 500 mpa
according to theory if hydrogen level increases critical cracking
stress will decreases but in my exp critical cracking stress is coming
more in low level of hydrogen

i would like to have your comment on this result

--~--~---------~--~----~------------~-------~--~----~
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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.
-~----------~----~----~----~------~----~------~--~---

[MW:857] Diffusible H2 content and Hydrogen cracking study

Dear Mr Mathusoothanan

Apriciate your posting, but I have to approve this message without the
attchements, since it is agianst the rules of this group (and all
members are requested to not post any codes/standards as attachements
in the group)

Thanking you for your co operation!

-----Original Message-----
From: mathu.subramanian [mailto:mathu.subramanian@kharafinational.com]
Sent: Thursday, June 12, 2008 10:20 AM
To: materials-welding@googlegroups.com
Subject: 851] Diffusible H2 content and Hydrogen cracking study

Dear friend,

E6013 is not the compatible electrode to weld Cr-Mo steels and it is
normal
carbon steel electrode. In Cr-Mo steels so many grades are there. Gr.1,
Gr.11, Gr.22, Gr.5, Gr.9, Gr.91. Please refer attached ASME Specs for
Electrodes & Materials. According to grade of material welding
electrodes is
to be selected.

As said by Mr Raghuram, two different AWS classifications can not be
compared for
diffusible hydrogen level. Two hydrogen levels of same AWS
classification
should be selcted.

I think the material grade you have selected might be Grade 9.

Regards.

S.Mathusoothanan

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Bathula
Raghuram
(Mumbai - PIPING)
Sent: 12 June, 2008 6:31 AM
To: materials-welding@googlegroups.com
Subject: [MW:851] Diffusible H2 content and Hydrogen cracking study


What type of Cr-Mo steel it is?
What is the basis of selecting E6013 for Cr-Mo steel?
Why diffusion hydrogen level required for E6013, when it is not a low
hydrogen electrode?
One can't compare the stress value with two different AWS
classifications; instead you can study by taking two different batches
of E9015B9 electrodes with different diff H2 levels (not comparing with
E6013) and test it!

Members please share your thoughts

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of mech
Sent: Wednesday, June 11, 2008 7:49 PM
To: Materials & Welding
Subject: [MW:846] on preheating effect


dear sir
i am a welding engg student and doing project on hydrogen cracking
of cr-mo steel by using implant test method.
the following result were observed

electrode diff hydrogen
level critical stress

E6013 (ruttile type) 5
ml 456 mpa
E9015 B9
10.6ml 500 mpa
according to theory if hydrogen level increases critical cracking
stress will decreases but in my exp critical cracking stress is coming
more in low level of hydrogen

i would like to have your comment on this result

--~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

[MW:853] Clarification on Heat treatment / PWHT -Reg.

In addition to what Mr Sachin wrote, Refer para F331 (Appendix F), you could land up in re tempering the material (of course re qualification of your procedure too), also the salvage is depends on operating temperature (max) and the holding time at higher temp during HT.

Its definitely not an easy solution.


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sachin sankhe
Sent: Wednesday, June 11, 2008 8:06 PM
To: materials-welding@googlegroups.com
Subject: [MW:848] Re: 835] Re: Clarification on Heat treatment / PWHT -Reg.

 

 
Dear Rishi,

Hardness wont be suffucient to accept since we have changed grain structure to certain extent by exceding PWHT temp.resulting in change in mechanical properties.

In that case you need to re-qualify the procedure with new PWHT temperature and all mechanical test to be done as per relevant specification requirement.
If the test passes then we can accept the production joint
If it fails then analysis of failure to be done and results to be conveyed to client.
Based on criticality of the job,let client decide wether to reject or do PHWT gain.
If they propose PWHT again then subsequently we have to qualify procedure with 2 times PWHT.

OTHER MEMBERS ARE ALSO WELCOME TO GIVE THEIR OPINION.

Regards
Sachin.Sankhe


On Wed, 11 Jun 2008 Singh Rishi Raj(Tasnee Site) wrote :
>Dear Friends,
>
>Staying with the subject line of heat treatment, I wanted to know (since
>long ) --------
>
>
>
>What should be done if the temperature while doing PWHT exceeds the
>range mentioned in WPS ??
>
>
>
>For example lets say-
>
>A weld between A335 P11 ( P 4  Gr 1) , thickness 17mm.  WPS ( & B 31.3
>) has the PWHT temp as 704-746 deg C.
>
>If the temp of  PWHT cycle exceeds the higher value by 40deg.
>Centigrade, what should be done?
>
>Can the joint be accepted based on the hardness value?
>
>
>
>Please also provide references with your answer.
>
>
>
>Best Regards,
>
>Rishi Raj Singh
>
>________________________________
>
> From: materials-welding@googlegroups.com
>[mailto:materials-welding@googlegroups.com] On Behalf Of Prabhakar h
>Sent: 09 June 2008 16:25
>To: materials-welding@googlegroups.com
>Subject: [MW:835] Re: Clarification on Heat treatment-Reg.
>
>
>
>Dear Shabbir,
>
>
>
>Thanks a lot for your prompt response and sorry even i cud not catch up
>quite a while as i was held up with my ASME Audits.
>
>
>
>Your Explanation was usefull and it would be better if you cud tell us
>at what conditions we go for the HT and how the same is selected???
>
>
>
>Prabhakar.H
>
>
>
>On 5/4/08, shabbir ahmad <shabbir.ahmad7@gmail.com> wrote:
>
>Dear Prabhakar,
>
>
>
>Nortmalizing: The steel is heated 50 deg. cent grade beyond the upper
>critical tempreture( generally 900 to 940), once the calculated soaking
>time has elapsed the steel is removed from the furnce to cool in still
>air, This produce smaller n fine grain structure that has high toughness
>n strength.In short u can say normalizung makes steel tougher n strong.
>
>
>
>Stress Reliving: Steel heated upto 550-650 d.c..The plastic flow of
>sresses increased as tempr. rises, relieving locked in elastic residual
>welding stress.
>
>
>
>Tempering: The steel is re-heated after hardening and the balance of
>hardness & toughness is adjusted as the temp range 200 - 723deg. cent.
>
>
>
>at 723 d.c. all the martensite has been tempered removing the
>brittleness 7 returning the toughness and some ductility. Normally
>tempering carried out to rebalance the propertied of thermally hardened
>steels.
>
>
>
>solution Annealing : generally carried out on Stainless steel, this
>produces large n coarse grain.Heating the steel above 1040 deg.centi
>grade and quench in oil.
>
>
>
>Thanks
>
>
>
>shabbir
>
>
>
>On 5/3/08, Prabhakar h <hb.prabhakar@gmail.com> wrote:
>
>
>
>      Dear all,
>
>
>
>      Can anyone let me know what is the difference bet'n
>Normallising/Stress releiving/Tempering/Solution anneling..
>
>
>
>      I always get confussed and cudnt get a better idea....
>
>
>
>      Is there anyone to help it out....?
>
>
>
>      Prabhakar.H
>
>      </div
>
>
>>

Sachin.Sankhe
Engineer-Inspection
Aker Kvaerner-Malaysia
Mobile:012-2896901
Email1:Sachin.Sankhe@akerkvaerner.com
Email2:Sachin.sankhe@rediffmail.com

Amity</Table


 


--~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

[MW:854] RE: 845] Re: Thanx & STT welding procedur

We have used STT welding in Jamnagar phase-I refinery at Fabrication
shops,to facilitate SAW machine welding. But we have faced root porosity
problems severely. It was difficult to avoid due to heavy wind from the
downstream side of the fabrication shops and air from the inside of
piping.

We have shifted to E6010/GTAW root during the next phases of expansion
and STT machines were not used significantly.

STT is a good process provided your welding environment could be
controlled.

Regards,

P.M.Ganesan

Site QC Manager

QA&C Department

Kharafi National

P.O. Box: 24081, Safat - 13101, Kuwait

Mob: +965.7202358

Email: p.ganesan@kharafinational.com

Website: www.kharafinational.com
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of gajjalla surya
prakash
Sent: 11 June, 2008 6:22 AM
To: materials-welding@googlegroups.com
Subject: [MW:845] Re: Thanx & STT welding procedur

please find the attached qualified procedure for STT welding ,STT
welding is sucessfully used in reliance petroleum jamnagar .


surya prakash gajjall

ASSOCIATED ENGINEERING SERVICES
www.aesinspections.net.

On 6/10/08, Fly Yalung <fly_ma_alkawari@yahoo.com> wrote:
>
> Dear Sir S. N. Dave,
> Thank yoy for giving us the information. I have another query this
regarding
> STT welding process, does this effecient to use? Does S. Aramco will
require
> another procedure to be approve? If it will require can you help me to
> gother information to make a procedure to STT welding process.
> Thank you very much for the cooperation.
>
> Best Regards,
> Fly L. Yalung - Material Engineer
> M. A. Al-Kawari Est.
> Ph: 03-5721079
> fax: 03-5721471
> fly_ma_alkawari@yahoo.com
>
>
>
> ----- Original Message ----
> From: shailesh dave <snd2988@yahoo.com>
> To: materials-welding@googlegroups.com
> Sent: Sunday, June 8, 2008 6:23:06 AM
> Subject: [MW:832] Re: STI Welding
>
> Do you mean STIR WELDING?
>
> REGARDS,
>
> S.N.DAVE
>
> QA/QC MANAGER
>
> TATA PROJECTS LIMITED
>
> IWPP-III, SHAUIABAH, SAUDI ARABIA
>
> fly_ma_alkawari@yahoo.com wrote:
>
> Whom it may concern;
> Has anyone had encountered STI welding?
>
>
>
> >
>

--~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

Re: [MW:34832] Inquiry about Single Bevel with Back Grinding

Dear Uday, As per your question that one is called with backing only,Simple both side you are welding it is backing with strip or without st...