Thursday, December 31, 2009

[MW:3936] WQT pipe dimensions

Can anybody please tell me what is the minimum required dimensions of test piece for the qualification of welders in 6G as per API 1104   



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Re: [MW:3935] RE: 3925] Filler metal SS316 to ASTM A106 Gr.B


Hi Vasanth,
 
We have specially ordered material of ASTM A106 Gr.B at -40 Deg Cel.
 
More over, -40 is the max temp may encountered otherwise the normal working temp is only -20 deg cel in my case.
 
Regards,
 
K.Babu
 
 
On Thu, Dec 31, 2009 at 3:51 PM, Chandra, Vasanthan (Lagos) <Vasanthan.Chandra@deltaafrik.com> wrote:

You can use E309Mo but ensure that A106 Gr B application at -40 Deg.C when impact is required (CS HAZ and CS BM side.) Why don't you consider SA 333 Gr 6?

 

Regards,
Vasanth


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of babu k
Sent: 30 December 2009 16:28
To: materials-welding@googlegroups.com
Subject: [MW:3925] Filler metal SS316 to ASTM A106 Gr.B

 

Hi gents,

 

On the basis of  metallurgical point of view, is there any effect of choosing E309Mo as the filler metal for the above combination of base metal.

 

Service temp is minus 40 (Max.) 

 

Regards,

 

K.Babu,

Singapore 

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[MW:3934] RE: 3925] Filler metal SS316 to ASTM A106 Gr.B

You can use E309Mo but ensure that A106 Gr B application at -40 Deg.C when impact is required (CS HAZ and CS BM side.) Why don’t you consider SA 333 Gr 6?

 

Regards,
Vasanth


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of babu k
Sent: 30 December 2009 16:28
To: materials-welding@googlegroups.com
Subject: [MW:3925] Filler metal SS316 to ASTM A106 Gr.B

 

Hi gents,

 

On the basis of  metallurgical point of view, is there any effect of choosing E309Mo as the filler metal for the above combination of base metal.

 

Service temp is minus 40 (Max.) 

 

Regards,

 

K.Babu,

Singapore 

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[MW:3933] RE: 3932] Boiler quality steel Vs. Structural quality steel

What type of steel it is? is it specified in UCS 23? , you may use steels like SA36, SA283 Gr A/B/C, provided conditions as specified in UCS6 (b)  are met for Section VIII div 1 vessels


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Agrawal Sunil (Mumbai -Stequ)
Sent: Thursday, December 31, 2009 12:55 PM
To: materials-welding@googlegroups.com
Subject: [MW:3932] Boiler quality steel Vs. Structural quality steel

What is the basic difference between Boiler quality steel and Structural quality steel.

Can we use Structural quality steel if it passes all test of ASME?

 

Best Regards,

Sunil Agrawal


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[MW:3931] RE: 3928] Welder Qualification

Yes, you can send for RT and Bend test. We have done so many welders qualification under this specification and faced few problems like below.

 

Note: This situation is bit different from ASME Sec IX QW 306 in which the weld metal is deposited by the welder or welders by pass/layer over another pass/layer. Whereas, the below situation is entirely different. We have convinced PDO to proceed further.

 

 

Regards,
Vasanth


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of roshan shan
Sent: 31 December 2009 07:22
To: materials-welding@googlegroups.com
Subject: [MW:3928] Welder Qualification

 

Dear all,

 

Here we have a situation,

 

1) welder qualification conducted on 24" pipe as per Sec IX and client requirement(PDO SP-1096) with two welders welding from opposite sides( one welder welds the half portion and the other half by another welder).

2) RT accepted for 1st half of the portion, but the other half fails to meet the requirement.

 

Question: Whether the test coupon shall be sent for bend testing to qualify the welder who welded the first half?

 

 

NB:RT & Bend test required as per Client requirement.

 

Regards

 

Roshan

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[MW:3932] Boiler quality steel Vs. Structural quality steel

What is the basic difference between Boiler quality steel and Structural quality steel.

Can we use Structural quality steel if it passes all test of ASME?

 

Best Regards,

Sunil Agrawal


Re: [MW:3930] Filler metal SS316 to ASTM A106 Gr.B

There should be no Problem using E309Mo below 300 degee centigrade, for metal SS316 to ASTM A106 Gr.B.
 
Regards
Chitturi
On Wed, Dec 30, 2009 at 7:28 PM, babu k <kbabupsg@gmail.com> wrote:
Hi gents,
 
On the basis of  metallurgical point of view, is there any effect of choosing E309Mo as the filler metal for the above combination of base metal.
 
Service temp is minus 40 (Max.) 
 
Regards,
 
K.Babu,
Singapore 

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RE: [MW:3929] Welder Qualification

Dear Roshan

As per Sex IX, QW306 Combination of Welding Processes

 

“Failure of any portion of a combination test  in a single test coupon constitutes failure of entire combination”

So if one welder out of two is failed, when the test is conducted in single test coupon then the entire test is considered as fail / fail to meet the requirements of Sec IX.

 

Thank you

Regards

Harikumar.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of roshan shan
Sent: Thursday, December 31, 2009 9:22 AM
To: materials-welding@googlegroups.com
Subject: [MW:3928] Welder Qualification

 

Dear all,

 

Here we have a situation,

 

1) welder qualification conducted on 24" pipe as per Sec IX and client requirement(PDO SP-1096) with two welders welding from opposite sides( one welder welds the half portion and the other half by another welder).

2) RT accepted for 1st half of the portion, but the other half fails to meet the requirement.

 

Question: Whether the test coupon shall be sent for bend testing to qualify the welder who welded the first half?

 

 

NB:RT & Bend test required as per Client requirement.

 

Regards

 

Roshan

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[MW:3928] Welder Qualification

Dear all,
 
Here we have a situation,
 
1) welder qualification conducted on 24" pipe as per Sec IX and client requirement(PDO SP-1096) with two welders welding from opposite sides( one welder welds the half portion and the other half by another welder).
2) RT accepted for 1st half of the portion, but the other half fails to meet the requirement.
 
Question: Whether the test coupon shall be sent for bend testing to qualify the welder who welded the first half?
 
 
NB:RT & Bend test required as per Client requirement.
 
Regards
 
Roshan

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Re: [Bulk] [MW:3927] WPS & PQR clarification

Before carrying out any welding, we should ensure that the resultant welding meet the requirements of code. That's why Welding procedure (WPS) is established. WPS contains all essential & non essential varibales as per referencing code, Based on WPS the test sample is welded and actual records of all essential variables are recorded. After completion of welding, the sample will go for Testing (tensile test, bend test). After successful completion of all testing, all details (welding variables) will be recorded on a form, that is called as Procedure qualification record (PQR).
 
PQR is actual welding record. This PQR  can be used to support many WPS.
 
With only Qualified WPS, we can go ahead with welding.
 
Hope this is clear.
 
Mhaskar Aly
Kuwait.


From: Chaitanya Purohit <chaitanya_purohit@yahoo.co.in>
To: materials-welding@googlegroups.com
Sent: Wed, December 30, 2009 5:01:18 PM
Subject: Re: [Bulk] [MW:3926] WPS & PQR clarification

In simple words in construction language I can explain WPS / PQR as follows....

there will be Drawing approved for Construction = WPS prepared in initial stage
Construction process as per approved Drawing = Qualifiying PQR and Testing
As built Preparation and using the approved drawing for Proto type items = Modified WPS based on PQR data, used during welding of similar welds in future

Hope I made it clear....

Regards.
C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector


2009/12/30 mahen dran <cbemahendar@yahoo.com>
Dear Group
 
 Good day,
--------------------------------------------------------------------------------------------------------------------------------
Still I have confusion on WPS and PQR terms.
 
1. WPS to be created  first , with respect to  selection of process, electrode and current  etc.
2. PQR is developed  after WPS ,by entering the the actual variation  relevant to the WPS.
 
|Corresponding reference numbers are to be entered  in each other.
 
This is the information  from ASME IX codes.
 --------------------------------------------------------------------------------------------------------------------------
But there is a controvercial  statement  from some of our colleques, PQR to be developed first and  Supporiting PQR  reference number is to be entered in the WPS.
 
Please clarify this confusion .
 
 
mahendra
KSA

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[MW:3924] strip Lamiflex Hayness Alloy 25

Dear All,

Can any one suggest about the Strip lamiflex Material Hayness Alloy 25 used as one of the parts shown in the Breechlock type exchangers installed at our unit ?

Kindly share the purpose of these strips and also alternative material.

TQ.


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Wednesday, December 30, 2009

[MW:3925] Filler metal SS316 to ASTM A106 Gr.B

Hi gents,
 
On the basis of  metallurgical point of view, is there any effect of choosing E309Mo as the filler metal for the above combination of base metal.
 
Service temp is minus 40 (Max.) 
 
Regards,
 
K.Babu,
Singapore 

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Re: [Bulk] [MW:3926] WPS & PQR clarification

In simple words in construction language I can explain WPS / PQR as follows....

there will be Drawing approved for Construction = WPS prepared in initial stage
Construction process as per approved Drawing = Qualifiying PQR and Testing
As built Preparation and using the approved drawing for Proto type items = Modified WPS based on PQR data, used during welding of similar welds in future

Hope I made it clear....

Regards.
C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector


2009/12/30 mahen dran <cbemahendar@yahoo.com>
Dear Group
 
 Good day,
--------------------------------------------------------------------------------------------------------------------------------
Still I have confusion on WPS and PQR terms.
 
1. WPS to be created  first , with respect to  selection of process, electrode and current  etc.
2. PQR is developed  after WPS ,by entering the the actual variation  relevant to the WPS.
 
|Corresponding reference numbers are to be entered  in each other.
 
This is the information  from ASME IX codes.
 --------------------------------------------------------------------------------------------------------------------------
But there is a controvercial  statement  from some of our colleques, PQR to be developed first and  Supporiting PQR  reference number is to be entered in the WPS.
 
Please clarify this confusion .
 
 
mahendra
KSA

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Re: [MW:3923] WPS & PQR clarification

Dear Mahendra,
If you are running WPS for the first time then follow what other friends (
Daniek & Sukamal)suggested. Start with draft WPS , run PQR and finalize
WPS.
If you have many PQR`s in records from previous jobs/project within the
required specs and parameters, then you can issue a WPS based on the
existing one (s) and no need for a fresh PQR.
Regards

Fereidoun


mahen dran
<cbemahendar@yaho
o.com> To
Sent by: materials-welding@googlegroups.com
materials-welding cc
@googlegroups.com
Subject
[MW:3917] WPS & PQR clarification
12/30/2009 04:31
PM


Please respond to
materials-welding
@googlegroups.com


Dear Group

Good day,
--------------------------------------------------------------------------------------------------------------------------------
Still I have confusion on WPS and PQR terms.

1. WPS to be created first , with respect to selection of process,
electrode and current etc.
2. PQR is developed after WPS ,by entering the the actual variation
relevant to the WPS.

|Corresponding reference numbers are to be entered in each other.

This is the information from ASME IX codes.

--------------------------------------------------------------------------------------------------------------------------
But there is a controvercial statement from some of our colleques, PQR to
be developed first and Supporiting PQR reference number is to be entered
in the WPS.

Please clarify this confusion .


mahendra
KSA


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w.r.t. applicable code/standard/contract documents.

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Re: [MW:3922] WPS & PQR clarification

Dear Friend,
Before doing a new PQR, you have to make a "DRAFT" WPS to run the PQR.
After qualifying the NEW PQR with all the required mechanical tests
and perameter, modify the DRAFT WPS in a correct WPS with supporting
the new PQR with all the correct essential,non essential &
supplimentary essential varialbles(if impact required) as per the PQR.

Regards,

On 12/30/09, mahen dran <cbemahendar@yahoo.com> wrote:
> Dear Group
>
>  Good day,
> --------------------------------------------------------------------------------------------------------------------------------
> Still I have confusion on WPS and PQR terms.
>
> 1. WPS to be created  first , with respect to  selection of process,
> electrode and current  etc.
> 2. PQR is developed  after WPS ,by entering the the actual variation
> relevant to the WPS.
>
> |Corresponding reference numbers are to be entered  in each other.
>
> This is the information  from ASME IX codes.
>  --------------------------------------------------------------------------------------------------------------------------
> But there is a controvercial  statement  from some of our colleques, PQR to
> be developed first and  Supporiting PQR  reference number is to be entered
> in the WPS.
>
> Please clarify this confusion .
>
>
> mahendra
> KSA
>
>
>
>
> --
> 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.
>


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Re: [MW:3921] WPS & PQR clarification

Hi Mahendra,

First of all ....before any Qulification WPS and PQR ......you have develop a Preliminary ...or proposed WPS ....which will be base on material ...welding process consumable....and the scope of your application ...
According with Proposed WPS ...you will perform ...qualification .welding test.... base on you will record all data per runs ...speed ...heat input. .interpass temp....
After the welding test piece was done...after RT .is gone for mechanical test ....and base on will be issued PQR......according with your satisfactory results ...will be issued final WPS that  will be applied to future production welding (on wps will be specified the PQR numer supported)

regards

On Wed, Dec 30, 2009 at 1:31 PM, mahen dran <cbemahendar@yahoo.com> wrote:
Dear Group
 
 Good day,
--------------------------------------------------------------------------------------------------------------------------------
Still I have confusion on WPS and PQR terms.
 
1. WPS to be created  first , with respect to  selection of process, electrode and current  etc.
2. PQR is developed  after WPS ,by entering the the actual variation  relevant to the WPS.
 
|Corresponding reference numbers are to be entered  in each other.
 
This is the information  from ASME IX codes.
 --------------------------------------------------------------------------------------------------------------------------
But there is a controvercial  statement  from some of our colleques, PQR to be developed first and  Supporiting PQR  reference number is to be entered in the WPS.
 
Please clarify this confusion .
 
 
mahendra
KSA
 
 
 

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Re: [MW:3920] WPS & PQR clarification

Hi,
 
in my opinion...first you will make a preliminary or proposed pWPS and as per the mentioned variables( please note that VARIABLES, which means they can vary) you will make test coupon. In PQR you will enter the actual (range) values which you will get during the PQR run. and if all the required tests are passed, the pWPS will be amended and it becomes the actual WPS.
 
If you run the PQR first, I can ask you a question " Which procedure you are going to qualify?"
 
regards,
Nandesh

--- On Wed, 30/12/09, mahen dran <cbemahendar@yahoo.com> wrote:

From: mahen dran <cbemahendar@yahoo.com>
Subject: [MW:3917] WPS & PQR clarification
To: materials-welding@googlegroups.com
Date: Wednesday, 30 December, 2009, 12:31 PM

Dear Group
 
 Good day,
--------------------------------------------------------------------------------------------------------------------------------
Still I have confusion on WPS and PQR terms.
 
1. WPS to be created  first , with respect to  selection of process, electrode and current  etc.
2. PQR is developed  after WPS ,by entering the the actual variation  relevant to the WPS.
 
|Corresponding reference numbers are to be entered  in each other.
 
This is the information  from ASME IX codes.
 --------------------------------------------------------------------------------------------------------------------------
But there is a controvercial  statement  from some of our colleques, PQR to be developed first and  Supporiting PQR  reference number is to be entered in the WPS.
 
Please clarify this confusion .
 
 
mahendra
KSA
 
 
 

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Re: [MW:3919] the substitute NDT

Dear Eng. Mostafa,
If you wants the permanent record as it is the requirement of ASME Sec. VIII Div. 2 ....................
You have following two choices.
1. RT with CO 60 - Since It seems available to and fullfill ther requirement of Code.
As you mentioned you are worried about ineficiency of RT for 80mm.
You can do manual UT 100% weld length as per ASME section V - Article 4 prior to RT.
You can surely find all type of defects like Lack of fusions, cracks, Slags.
If the detected defects not acceptable in UT get them repaired. And for code requirement you can do RT for permanent Record.
 
2. Auto UT ToFD or Phased Array is the best choice for it and accepted by Code case 2239.
It may expensive and as you mentioned not easily available. If your job quantity is more you will get it and may be it will cheaper for you. But in this case you should find a company finalise the financial matters and then get the AUT procedure approved for your job. Qualification of AUT procedure is required. I can help you to find the NDT company providing the AUT services and write up the ToFD procedure. Contact me in this regards.
 
These are the two options.
 
Best Regards,

Nilesh Pathare.

 
On Wed, Dec 30, 2009 at 1:55 PM, Eng/ Mostafa Kamel Hussein <mkh_200@yahoo.com> wrote:

I have material with 80mm thickness and it's known that RT is not applicable for application as NDT, so what is the substitute method for NDT and please give me the code case number for that?

Note1: the applied code ia ASME VIII Div II

Note2: If the substitute NDT is UT with permanent record but also it's difficult to get it what is substitute to get NDT with permanent record????

 

Eng/Mostafa Kamel

Senior Welding Engineer

SIEMENS

+20104410009


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Re: [MW:3918] the substitute NDT

you can have RT but for it you have to use strong curie try for it i have tried for SHell of 78mm and it works but in it i use double films for excellent film contrast( ASME INSPECTOR ALLOW ME TO ADOPT THIS METHOD)
if you not want RT then UT too has permanent record or go for TOFD (NEW FORM OF UT)

On Wed, Dec 30, 2009 at 2:55 PM, Eng/ Mostafa Kamel Hussein <mkh_200@yahoo.com> wrote:

I have material with 80mm thickness and it's known that RT is not applicable for application as NDT, so what is the substitute method for NDT and please give me the code case number for that?

Note1: the applied code ia ASME VIII Div II

Note2: If the substitute NDT is UT with permanent record but also it's difficult to get it what is substitute to get NDT with permanent record????

 

Eng/Mostafa Kamel

Senior Welding Engineer

SIEMENS

+20104410009


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SAQIB JALAL
Inspection Engineer
PakArab Fertilizer Limited
Khanewal Road , Multan
office number +92-61-9061 EXT 3110
mobile number +92-321-4043556

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[MW:3917] WPS & PQR clarification

Dear Group
 
 Good day,
--------------------------------------------------------------------------------------------------------------------------------
Still I have confusion on WPS and PQR terms.
 
1. WPS to be created  first , with respect to  selection of process, electrode and current  etc.
2. PQR is developed  after WPS ,by entering the the actual variation  relevant to the WPS.
 
|Corresponding reference numbers are to be entered  in each other.
 
This is the information  from ASME IX codes.
 --------------------------------------------------------------------------------------------------------------------------
But there is a controvercial  statement  from some of our colleques, PQR to be developed first and  Supporiting PQR  reference number is to be entered in the WPS.
 
Please clarify this confusion .
 
 
mahendra
KSA
 
 
 

[MW:3916] the substitute NDT

I have material with 80mm thickness and it's known that RT is not applicable for application as NDT, so what is the substitute method for NDT and please give me the code case number for that?

Note1: the applied code ia ASME VIII Div II

Note2: If the substitute NDT is UT with permanent record but also it's difficult to get it what is substitute to get NDT with permanent record????

 

Eng/Mostafa Kamel

Senior Welding Engineer

SIEMENS

+20104410009


[MW:3915] RE: 3914] Non-standard austenitic SS forgings_SA 336 Vs SA 965

Pls. note that addenda 09 of ASME section II part A now made it mandatory to use SA 965 in place of SA 336 for austenitic forgings.

Cl. 1.3 of SA 965 in ASME section II part A mentions the same.

 

S. Banerjee

Static Equipment Department (STEQU)

Tecnimont ICB House, Chincholi Bunder, 504, Link Road, Malad (W), Mumbai - 64

Tel : + 91-22-6777 7029/ Fax : +91-22-6694 5599

E-mail : s.banerjee@ticb.com

Website : www.ticb.com


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Agrawal Sunil (Mumbai -Stequ)
Sent: Wednesday, December 30, 2009 10:46 AM
To: materials-welding@googlegroups.com
Subject: [MW:3914] Non-standard austenitic SS forgings_SA 336 Vs SA 965

 

Further to below mail, I also come across a case where client ask for SA 965 for non-standard austenitic SS forgings. However, our normal practice is to adopt SA 336 material for non-standard austenitic SS forgings.

 

Can any one guide me when to use SA 965 inplace of SA 336? Difference between them? Is there any code interpretation?

 

Best Regards,

Sunil Agrawal

Tecnimont ICB


From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Thursday, December 03, 2009 9:10 AM
To: materials-welding@googlegroups.com
Cc: Bathula Raghuram (Mumbai - PIPING)
Subject: FW: [MW:3786] Tube sheet material for LTCS application SA350 Vs SA765

 

Dear  Forum Members,

 

I made a quick comparison  between the above materials.

 

SA-350 Gr.LF2 is generally used for low temperature applications for forgings for forged or ring-rolled flanges, forged fittings and valves  where notch toughness (Charpy Impact) testing is required, and had been a very well acceptable material for many years.

 

SA-765 Gr.2 is similar in content to SA-350 Gr.LF2, except that this specification was developed specifically  for various forging components  tube sheets, covers, channel barrels, integral forged channels, rings, nozzles, flanges,and similar parts.

 

For forged componenets,e.g a tube sheet, channel barrells etc and others  the correct and probably the most recent specification should be SA-765 Gr.2.

 

In lieu of SA-765 Gr.2., SA 350LF2 is very well acceptable. SA 350LF2  generally have a proven history in low temperature services.

 

Appreciate answers from the others.

 

 

Thanks

 

 

Pradip Goswami

Welding and Metallurgical Engineer/Specialist.

pradip.goswami@opg.com

 

 


 


Subject: [MW:3780] Tube sheet material for LTCS application SA350 Vs SA765
Date: Tue, 1 Dec 2009 16:03:00 +0530
From: R.Bathula@ticb.com
To: materials-welding@googlegroups.com

I have come across few client specifications where SA350 LF2 is prohibited for use as tube sheet/non std flange material (MDMT -29 to -48 °C), instead SA765 Gr II is selected.
Apart from the scope of SA765, which clearly indicates it is for use as non standard forgings, such as tubes sheets, barrels etc, where SA 350 is silent on this part
It is common to use SA350 LF2 as tube sheet material, and as large dia vessel body flanges (not covered by ASME B16.5/16.47), and never had any problem interms of weldability or toughness etc.
Any views or failure of SA 350 LF2,  if anybody come across please share.



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[MW:3914] Non-standard austenitic SS forgings_SA 336 Vs SA 965

Further to below mail, I also come across a case where client ask for SA 965 for non-standard austenitic SS forgings. However, our normal practice is to adopt SA 336 material for non-standard austenitic SS forgings.

 

Can any one guide me when to use SA 965 inplace of SA 336? Difference between them? Is there any code interpretation?

 

Best Regards,

Sunil Agrawal

Tecnimont ICB


From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Thursday, December 03, 2009 9:10 AM
To: materials-welding@googlegroups.com
Cc: Bathula Raghuram (Mumbai - PIPING)
Subject: FW: [MW:3786] Tube sheet material for LTCS application SA350 Vs SA765

 

Dear  Forum Members,

 

I made a quick comparison  between the above materials.

 

SA-350 Gr.LF2 is generally used for low temperature applications for forgings for forged or ring-rolled flanges, forged fittings and valves  where notch toughness (Charpy Impact) testing is required, and had been a very well acceptable material for many years.

 

SA-765 Gr.2 is similar in content to SA-350 Gr.LF2, except that this specification was developed specifically  for various forging components  tube sheets, covers, channel barrels, integral forged channels, rings, nozzles, flanges,and similar parts.

 

For forged componenets,e.g a tube sheet, channel barrells etc and others  the correct and probably the most recent specification should be SA-765 Gr.2.

 

In lieu of SA-765 Gr.2., SA 350LF2 is very well acceptable. SA 350LF2  generally have a proven history in low temperature services.

 

Appreciate answers from the others.

 

 

Thanks

 

 

Pradip Goswami

Welding and Metallurgical Engineer/Specialist.

pradip.goswami@opg.com

 

 


 


Subject: [MW:3780] Tube sheet material for LTCS application SA350 Vs SA765
Date: Tue, 1 Dec 2009 16:03:00 +0530
From: R.Bathula@ticb.com
To: materials-welding@googlegroups.com

I have come across few client specifications where SA350 LF2 is prohibited for use as tube sheet/non std flange material (MDMT -29 to -48 °C), instead SA765 Gr II is selected.
Apart from the scope of SA765, which clearly indicates it is for use as non standard forgings, such as tubes sheets, barrels etc, where SA 350 is silent on this part
It is common to use SA350 LF2 as tube sheet material, and as large dia vessel body flanges (not covered by ASME B16.5/16.47), and never had any problem interms of weldability or toughness etc.
Any views or failure of SA 350 LF2,  if anybody come across please share.



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Tuesday, December 29, 2009

[MW:3913] Re: Stress Corrosion Cracking in expansion joints

Dear Alzoubi,

Stainless steel austenitic grades are susceptible to stress corrosion
cracking because of their Ni% content (range between 10 - 30%). You
should substitute the 304 for a duplex grade (like 2205) or a nickel
alloy, following recommendations of Mrs. Bagchi.

The presence of Cl / F (a few mg / l) will increase the probability of
pitting corrosion mech; These mechanisms (pitting and scc) acting
together represent a very severe operating condition. Molybdenum
alloys have best pitting resistance (eg.: 316L has 2-3% Mo and its
PREN ranges 24 versus 18 of 304).

A think you should check the presence of halogens again.

Note: PREN - Pitting resistance equivalent number (higher is better).


On Dec 21, 3:09 am, snbag...@aol.in wrote:
> Dear
> ENG. Ryiad Alzoubi
> A simpler and cost effective solution could be to electro-plate or (better) clad the inside surface of the bellows with nickel or clad with Monel/Inconel type corrosion resistant alloys. For more options and details, you can contact me at snbag...@ymail.com.
>
> Regards,
> S.N.Bagchi.
>
> -----Original Message-----
> From: Tirumala B N Tagore <tagore....@gmail.com>
> To: materials-welding@googlegroups.com
> Sent: Sun, 20 Dec 2009 11:26 pm
> Subject: Re: [MW:3856] Stress Corrosion Cracking in expansion joints
>
> 1.Expansion joints lateral deflections are to be verified whether they are in range. Axial expansions are normally catered. Lateral deflections do have confined limitations.
> In the first stage you need to examine at least one expansion joint for metallurgical evaluation.
>
> 2.since the failure is noticed from inside to outside, please look in to steam being handled (inside fluid) whether it has some traces of Chloride as well as sulphur compounds.
>
> 3.Normally expansion joints can have some condensates collected during turn arounds and / or during some process upsets and this collected condensate , if with chloride / sulphide , then you have this problem . However you can suspect this if failure is at bottom portion on horizontal lines.If this is the case, you may mitigate the next failure if drain connections are provided.
>
> 4. SS duplex or Incoloy Expansion bellows to be choosen , when you can replace in stages. for duplex, you MUST establish that the root cause is stress corrosion cracking only.
> Tagore
>
> On Sun, Dec 20, 2009 at 4:45 AM, rzoubi <rzo...@just.edu.jo> wrote:
>
> Dear Forum Members,
>
> We have consructed a high temperature hot water disrict heating system early in the year 2000,the initial insallation of the system was not so good -there were some axial and lateral deflection in the system- .The expansion joints are made fromS.S304,after 3 to 4 years of operation ,we noticed cracks in the bellows ,starting from inside to outside the layers(9 layers).When refering this prblem to some experts in our country, they called it stress corrosion cracking related to chloride content in the sarrounding envr..W e asked an expert to ckeck the presence of chloride in the envr., he found no traces of this gas.As we have no budget to replace all the expansion joints in the future,we are obliged to replace the defected exp.joint when the joint starts to leak.In order to vercome this problem we are thinking to paint these joints with a high temp. resisiting paint up to 200degree c,as the max.operating temp. is 150degree.(the operating pressure is around 20 bar).
> Plase advise whether this idea is right,if not please give us another solution.
>
> Thank you in advance
> ENG.RIYAD ALZOUBI
>
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Monday, December 28, 2009

Re: [MW:3912] Regarding CSWIP EXAM

Hi Vinit,
 
Good decision....
 
You can go directly 3.2 (Senior Certified Welding Inspector), provided you have to show atleast 05 years documented experience related to inspection.
 
I strongly advice you to go for CSWIP 3.1(Welding Inspector ) first and aquire 02 years' experience and do 3.2.
 
FOR MORE DETAILS VISIT WWW.CSWIP.COM AND WWW.TWI.CO.UK
 
REGARDS,
Nandesh Kumar A
--- On Sun, 27/12/09, saqib jalal <sakib321@gmail.com> wrote:

From: saqib jalal <sakib321@gmail.com>
Subject: Re: [MW:3909] Regarding CSWIP EXAM
To: materials-welding@googlegroups.com
Date: Sunday, 27 December, 2009, 6:39 PM

ya you can appear directly in 3.2 but i prefer you to do CSWIP 4.0
for further detail visit twi website
On Sun, Dec 27, 2009 at 12:25 PM, vinit vani <vinit_vani@yahoo.co.in> wrote:
Dear ALL
        I am BE Mechanical with 9 years experience .I have 8 years experience  in projects .I want to achieve certification in CSWIP (Welding Insp). I want to know  that whether i can go directly for CSWIP 3.2 ? What is the basic difference between CSWIP 3.1 & 3.2. Also as I am near to Mumbai,please provide me the all necessary details including fees to achieve this certification at the earliest.
        Thanks in advance.
        Regards
         Vinit


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SAQIB JALAL
Inspection Engineer
PakArab Fertilizer Limited
Khanewal Road , Multan
office number +92-61-9061 EXT 3110
mobile number +92-321-4043556
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[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

Hello,   Please see the response below.   Regards.   P. Goswami, P. Eng, IWE.   From: materials-welding@googlegroups.com <materials-weld...