Thursday, December 31, 2020

Re: [MW:31890] B91 material

FOR Gr 91- ER90S- B9, ER9015-B91  consumables ,  minus 20 Deg C = 40 J can not be achieved due to Cr  Mo Nb V weld metal chemistry.
  Plus 20 Deg C =  40 J   is the requirement so as to have good toughness to weld metal.
This is the requirement that is specified by most of the Customer Specifications.
 
Minus 20  Deg C just can not be met.



On Thu, Dec 31, 2020 at 8:37 AM Jamie Reyes <jamiejrmachineco@gmail.com> wrote:
Honestly, to many variables involved. To the welding process used, to the weldor's technique, just to many variables to give you an educated answer. One would be guessing. Maybe you can post the WPS used? Sorry I couldn't be more helpful. More information is needed.....

Regards,
Jamie Reyes
J.R. Machine Company, Inc.


On Wed, Dec 30, 2020 at 8:26 PM Pravin Poornachandran <htcispravin@gmail.com> wrote:
Dear expert, 

I have B91 material to be weld, 6mm and 10mm thickness, however project requirement need to test -20degC impact which I don't really agree due to Cr-Mo is not intended for low temperature application. 

I performed PWHT 770degC x 1hr but unable to achieve desired charpy, I was wondering if I extend holding time for 6hr, is it possible to achieve -20degC? (Average 40J). 

Welding Process: SMAW and GTAW 

Could anyone advise and guide how to achieve desired impact ? 

Best regards,
Pravin 

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Re: [MW:31889] B91 material

Honestly, to many variables involved. To the welding process used, to the weldor's technique, just to many variables to give you an educated answer. One would be guessing. Maybe you can post the WPS used? Sorry I couldn't be more helpful. More information is needed.....

Regards,
Jamie Reyes
J.R. Machine Company, Inc.


On Wed, Dec 30, 2020 at 8:26 PM Pravin Poornachandran <htcispravin@gmail.com> wrote:
Dear expert, 

I have B91 material to be weld, 6mm and 10mm thickness, however project requirement need to test -20degC impact which I don't really agree due to Cr-Mo is not intended for low temperature application. 

I performed PWHT 770degC x 1hr but unable to achieve desired charpy, I was wondering if I extend holding time for 6hr, is it possible to achieve -20degC? (Average 40J). 

Welding Process: SMAW and GTAW 

Could anyone advise and guide how to achieve desired impact ? 

Best regards,
Pravin 

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Wednesday, December 30, 2020

[MW:31888] B91 material

Dear expert, 

I have B91 material to be weld, 6mm and 10mm thickness, however project requirement need to test -20degC impact which I don't really agree due to Cr-Mo is not intended for low temperature application. 

I performed PWHT 770degC x 1hr but unable to achieve desired charpy, I was wondering if I extend holding time for 6hr, is it possible to achieve -20degC? (Average 40J). 

Welding Process: SMAW and GTAW 

Could anyone advise and guide how to achieve desired impact ? 

Best regards,
Pravin 

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Monday, December 28, 2020

Re: [MW:31887] Tubes expansion beyond drum thickness.

Please refer to literature on boiler tube expansion on www.venus- boiler. com
Regards

On Mon, 28 Dec, 2020, 3:07 pm Neeraj Yadav, <neeru25oct@gmail.com> wrote:

Any reference for expansion beyond drum thickness is not acceptable as per ASME Standards/IBR.


This is specifically mentioned in TEMA that expansion length shall be the tubesheet/drum thickness minus 1/8" (3.2 mm) and no expansion of tubes beyond drum/tubesheet thickness is acceptable.

However these standards are being followed for Heat exchangers (Heaters, condensers, coolers & re-boilers) only and our boiler is designed as per ASME Sec-1 and IBR.  


On Mon, Dec 28, 2020 at 10:37 AM Prasad Ghanekar <prsgne@gmail.com> wrote:
Expanded beyond shell thickness is not acceptable. There will be a notch formation on tube at edge of shell. Tubes are likely to be sheared at this point.

Prasad G.

On Sun, 27 Dec 2020, 10:31 Neeraj Yadav, <neeru25oct@gmail.com> wrote:

Min-8% to Max-20%
On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:
What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Thanks & Regards


Neeraj Yadav

M.No.:+91-9457487464, 7017375440

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Re: [MW:31886] Tubes expansion beyond drum thickness.

Any reference for expansion beyond drum thickness is not acceptable as per ASME Standards/IBR.


This is specifically mentioned in TEMA that expansion length shall be the tubesheet/drum thickness minus 1/8" (3.2 mm) and no expansion of tubes beyond drum/tubesheet thickness is acceptable.

However these standards are being followed for Heat exchangers (Heaters, condensers, coolers & re-boilers) only and our boiler is designed as per ASME Sec-1 and IBR.  


On Mon, Dec 28, 2020 at 10:37 AM Prasad Ghanekar <prsgne@gmail.com> wrote:
Expanded beyond shell thickness is not acceptable. There will be a notch formation on tube at edge of shell. Tubes are likely to be sheared at this point.

Prasad G.

On Sun, 27 Dec 2020, 10:31 Neeraj Yadav, <neeru25oct@gmail.com> wrote:

Min-8% to Max-20%
On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:
What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Thanks & Regards


Neeraj Yadav

M.No.:+91-9457487464, 7017375440

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Re: [MW:31885] Tubes expansion beyond drum thickness.

there is bulging immediate outside drum thickness, is it acceptable

THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE,  CSWIP 3.1,
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International Welding Engineer. 
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349


On Mon, Dec 28, 2020 at 10:37 AM Vishwas Keskar <vvkeskar123@gmail.com> wrote:
20 %  expansion - seems on higher side. Normal is @8-12 %
Advice - 
Check thinning  and find out tube thickness .
Check this much thk after thinning this much  is acc to Engineering .


On Sun, Dec 27, 2020 at 9:01 AM Neeraj Yadav <neeru25oct@gmail.com> wrote:

Min-8% to Max-20%
On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:
What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Sunday, December 27, 2020

Re: [MW:31883] Tubes expansion beyond drum thickness.

Expanded beyond shell thickness is not acceptable. There will be a notch formation on tube at edge of shell. Tubes are likely to be sheared at this point.

Prasad G.

On Sun, 27 Dec 2020, 10:31 Neeraj Yadav, <neeru25oct@gmail.com> wrote:

Min-8% to Max-20%
On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:
What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Re: [MW:31883] Tubes expansion beyond drum thickness.

20 %  expansion - seems on higher side. Normal is @8-12 %
Advice - 
Check thinning  and find out tube thickness .
Check this much thk after thinning this much  is acc to Engineering .


On Sun, Dec 27, 2020 at 9:01 AM Neeraj Yadav <neeru25oct@gmail.com> wrote:

Min-8% to Max-20%
On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:
What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Saturday, December 26, 2020

Re: [MW:31882] Tubes expansion beyond drum thickness.


Min-8% to Max-20%
On Saturday, 26 December 2020 at 13:14:34 UTC+5:30 Vishwas Keskar Welding Manager WELDING wrote:
What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru...@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Re: [MW:31881] Tubes expansion beyond drum thickness.

What is  expansion % ?


On Fri, Dec 25, 2020 at 3:57 PM Neeraj Yadav <neeru25oct@gmail.com> wrote:
Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Friday, December 25, 2020

[MW:31881] ‘DESIGN PRESSURE’ VS. ‘MAWP’ FOR PRESSURE VESSELS

Source: The Pressure news (This newsletter is a publication of
ABSA) Volume 25, Issue 4, December 2020

One issue that is commonly seen on submitted pressure vessel drawings is the indication of a 'design pressure' for the vessel, in addition to the vessel's maximum allowable working pressure (MAWP). Although from a process engineering perspective, a 'design pressure' for the vessel may have been initially important in specifying the vessel's minimum purchase parameters, from a regulatory point of view and within the scope of the ASME code, the vessel's initially-specified 'design pressure' loses its relevance, and indicating it on a vessel drawing has the potential to cause problems.
From the process engineering perspective, when a pressure vessel is required to be designed for a certain MAWP, this minimum required working pressure is referred to as the vessel's 'design pressure'. The pressure vessel is then designed to suit the specific application: although the vessel is designed to accommodate this minimum specified MAWP, materials are typically chosen based on available plate thicknesses, and parts chosen based on supplier availability. Once material thicknesses, vessel geometry, and detailed component designs are finalized, the vessel can often be shown to be suited to a higher MAWP than the purchaser had originally specified. Quite often, the manufacturer seeks design registration for this higher MAWP, and marks it on the vessel's required nameplate and Manufacturer's Data Report. This does not present a problem, because in order to do this, the vessel must be fully suited to this designated MAWP, exceeding the purchaser's specified requirements.
Once a vessel has a designated MAWP, that designated MAWP for all intents and purposes is the vessel's MAWP, and the vessel must meet all applicable code and regulatory requirements with respect to this actual designated MAWP – the minimum MAWP that had previously been required by the purchaser is no longer relevant with respect to the vessel's required compliance with the code and associated regulations. Any revisions to the vessel's design, along with any future alterations made to the vessel, must meet all requirements with respect to the vessel's designated MAWP. Indicating the purchaser's originally-specified MAWP on the vessel drawing and identifying it as the vessel's 'design pressure' can then be a source of problems.
The main danger in indicating a 'design pressure' on a vessel drawing is that it is typically lower than the vessel's MAWP, and can be mistaken for the vessel's MAWP when that drawing is relied upon for subsequent repairs and alterations. There are known cases in the past where alterations have been made to suit a vessel's 'design pressure' based on a value shown on the vessel drawing, rather than its MAWP, leading to the vessel inadvertently being derated for the lower pressure. This can turn out to be more than a minor inconvenience to equipment owners, as overpressure protection may have been selected to suit the vessel's MAWP rather than its lower 'design pressure', or there may have been modifications made to the surrounding process to take advantage of the vessel's higher original MAWP. Fixing the problem in these instances could involve undertaking an additional alteration of the vessel to return it to its previous MAWP, or making new adjustments to the process in order to suit the vessel's lower, as-modified pressure capacity.
Confusion can also come from the fact that although ASME Section VIII-1 does not define 'design pressure' for a vessel as a whole, it does define the term with respect to a vessel component, or with respect to a location within the vessel: the 'design pressure' for a vessel component is required to be at least equal to the MAWP of the vessel, with additional allowance provided for any pressure caused by static liquid head at the location being considered. This 'design pressure' that is within the scope of the vessel code is thus required to be at least equal to the vessel's MAWP, whereas the 'design pressure' parameter from the process engineering perspective is a minimum specified MAWP, and thus it is typically less than the vessel's MAWP. This creates an apparent paradox between the terms that has led to some confusing discussions over the years.
A 'design pressure' specified by a purchaser as the vessel's minimum required MAWP ideally should not be included on a vessel drawing or Manufacturer's Data Report, or marked directly on the vessel, as it is no longer relevant to code compliance of the vessel once the vessel design is finalized. Experience has shown that indication of this purchase parameter on official vessel documentation or on the vessel itself can contribute to errors that can lead to unsafe situations and potential rework. If such a parameter is required to be placed on a vessel drawing, it should be clearly labeled as a "process design pressure" or "minimum MAWP required by purchaser", and kept away from the drawing's design data block in order to avoid potential confusion. Appropriate word choice and careful planning of drawing contents can serve a vessel owner well, by helping to avoid the potential for confusion and costly mistakes. 

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[MW:31879] Tubes expansion beyond drum thickness.

Dear experts,

We are executing a project for 35 TPH Natural Gas fired Auxiliary Boiler designed for max. working pressure of 60 kg/cm2 and steam temperature of 392 Deg .Cel.

All water tubes of boiler are connected to steam( 63 mm Thk) & Mud drum(40mm Thk) with expanded design of construction.

In mud drum it is observed that tubes ( 51X4 mm) are expanded upto 30mm more than the drum thickness and indicating as bulged. we have checked the OD at bulged part and observed 1-2 mm flared and thickness around 3.5 mm

Kindly advise weather it is acceptable or we have to replace the se tubes with reference to code. Code of construction is ASME Sec-1/IBR.

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Tuesday, December 22, 2020

Re: [MW:31878] E316L -15for Type 304L SS welding -cryogenic services

Well! the reason behind E3016L -15 recommendation is :
SMAW = E306L -  15 - It has lower  FN and in turn  better Notch Toughness values at -196   Deg C .
- 15 covering produce much cleaner weld metal( lesser Oxygen , Nitrogen) that is must for  achieving Notch Toughness values at -196   Deg C .


On Tue, Dec 22, 2020 at 9:11 AM sela <mechselastine@gmail.com> wrote:
Experts

Below  requirement given in one LNG project... 

Welding Consumables:
1. SMAW Consumables for Type 304L Stainless Steel Impact Tested at -196°C (-320°F).
Consumable:
ASME Specification SFA 5.4 in Part C, Section II Material Specification
- AWS Classification E316L-15
Certification and Testing:
ASME Specification SFA 5.01 in Part C, Section II Material Specification
- Lot Classification - C5
- Level of testing - Schedule K
Testing Requirements for each Lot of electrode:
Each Lot of electrode shall be certified with the minimum following testing:
- Chemical analysis of weld metal to meet the requirements for classification E316L
except the maximum phosphorus shall be 0.03% and the maximum sulphur shall be
0.02%.
- Delta ferrite determination per paragraph A6.9 of SFA 5.4. The weld metal shall be
a maximum Ferrite Number of 2 FN.
- Charpy V-notch impact test shall be performed on the weld metal in accordance
with SFA 5.4, paragraph A9.3.1. The weld test assembly shall be prepared and
welded with CVN specimens removed as per paragraph A9.3.5 of SFA 5.4. Five
impact specimens shall be tested at -196°C (-320F). The lowest and highest values
obtained shall be disregarded. The three remaining values shall be equal to, or
exceed, 20 mils of lateral expansion. The energy in ft-lbs and the percent ductile
fracture areas shall be reported for information.

Question
1) what is the technical  Reason behind for E316L -15 for Type 304L SS welding  SMAW process -cryogenic , however for GTAW process ER308L specified for Type 304L welding.  

Regards
sudhakar

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[MW:31877] E316L -15for Type 304L SS welding -cryogenic services

Experts

Below  requirement given in one LNG project... 

Welding Consumables:
1. SMAW Consumables for Type 304L Stainless Steel Impact Tested at -196°C (-320°F).
Consumable:
ASME Specification SFA 5.4 in Part C, Section II Material Specification
- AWS Classification E316L-15
Certification and Testing:
ASME Specification SFA 5.01 in Part C, Section II Material Specification
- Lot Classification - C5
- Level of testing - Schedule K
Testing Requirements for each Lot of electrode:
Each Lot of electrode shall be certified with the minimum following testing:
- Chemical analysis of weld metal to meet the requirements for classification E316L
except the maximum phosphorus shall be 0.03% and the maximum sulphur shall be
0.02%.
- Delta ferrite determination per paragraph A6.9 of SFA 5.4. The weld metal shall be
a maximum Ferrite Number of 2 FN.
- Charpy V-notch impact test shall be performed on the weld metal in accordance
with SFA 5.4, paragraph A9.3.1. The weld test assembly shall be prepared and
welded with CVN specimens removed as per paragraph A9.3.5 of SFA 5.4. Five
impact specimens shall be tested at -196°C (-320F). The lowest and highest values
obtained shall be disregarded. The three remaining values shall be equal to, or
exceed, 20 mils of lateral expansion. The energy in ft-lbs and the percent ductile
fracture areas shall be reported for information.

Question
1) what is the technical  Reason behind for E316L -15 for Type 304L SS welding  SMAW process -cryogenic , however for GTAW process ER308L specified for Type 304L welding.  

Regards
sudhakar

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Monday, December 21, 2020

Re: [MW:31876] PWHT required after Preheat for CS or LTCS

Mr. Jose Juan Jimenez,
 I agree wholeheartedly, but you need to remember also that the people that are asking these questions are not in tuned with every aspect that is needed.  Now that you brought it to their attention, I'm sure they will understand now, and like I stated previously, I agree with everything you stated. It frustrates me a lot, but I always take a step back and remember what I just mentioned above. Out of all the forms that I belong to, I would have to say that this is the least structured but nonetheless, I am here to help where ever and whenever need be. Keep educating, and stay blessed......

On Sun, Dec 20, 2020 at 7:22 PM José Juan Jiménez Alejandro <jjjimeneza@gmail.com> wrote:
I think it is extremely important that colleagues who ask a question in this forum structure it in the most complete way possible, because those of us who are here in the forum cannot be guessing many of the variables of the problem posed, many assume that some issues are taken for granted, but the truth is that we are not facing the problem you are presenting and therefore we cannot measure the magnitude of this problem, hence the importance of asking exact questions, giving all possible details, these They are: Exact material specifications, building code if any, customer specifications, type of service and a thousand other things that will serve us and will shed light on the nature of the problem and this will give us more data to help them in the most efficient way. possible, you see the problem live, we will have a more or less clear idea as you provide the largest and best amount of information ion, WE DON'T GUESS FOR MANY YEARS THAT WE HAVE EXPERIENCE.
Thanks for understanding.
Cheers!.

El vie, 18 dic 2020 a las 22:39, Ramin Kondori (<raminkondori@gmail.com>) escribió:
Dear Thanh,

Aside from code requirements, it depends on toughness requirements for the job (Impact test).
The welding procedure qualification for LTCS materials (e.g. A333) normally includes impact testing (e.g. at -48C); and without PWHT, it is not easy to pass this test and in the end, you have to perform PWHT to have your PQR approved. Most probably, you have to perform PWHT on all thicknesses. 

Regards  
Ramin  Kondori
Sr. QA/QC & Welding Engineer
-----------------------------------------------------------
PG-Dip. in Welding Engineering (IWE  AT  0070)
BSc. in Civil Engineering (IUT)
BGAS Painting Inspector
ASNT Level I&II
                        
IIW-Logo-Colour-small


On Thu, Dec 17, 2020 at 7:17 AM thanh tung Nguyen <tungexp.268@gmail.com> wrote:
Dear Experts,

Hope you all are well.

I have a question is about the weld of the base material of CS (or Low temp. CS) with wall thickness greater than 25mm, Do we still required PWHT if we applied a preheating process before, or PWHT is no longer mandatory?

And which reference can be found?

Thank you & best regards./.

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Jamie Reyes
J.R. Machine Company, Inc.

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Sunday, December 20, 2020

Re: [MW:31874] Storage of Stainless Steel Materials (Spool , pipes)

The bigest risk is to get in contact with carbon Steel or copper alloys

Στις Παρ, 18 Δεκ 2020, 06:37 ο χρήστης ilkinhasanov <ilkinhasanov.91@gmail.com> έγραψε:
Hi Gents,

Is there any specific Standard or Guideline , where I can find storage requirements for Stainless Steel materials (Spool and pipes)?

Is there any potential hazards regarding contamination of pipes/spools when they stored in the open air (sometimes under rain-on the wood pallets)??

Regards,
Ilkin Hasanov  

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Saturday, December 19, 2020

Re: [MW:31874] PWHT required after Preheat for CS or LTCS

I think it is extremely important that colleagues who ask a question in this forum structure it in the most complete way possible, because those of us who are here in the forum cannot be guessing many of the variables of the problem posed, many assume that some issues are taken for granted, but the truth is that we are not facing the problem you are presenting and therefore we cannot measure the magnitude of this problem, hence the importance of asking exact questions, giving all possible details, these They are: Exact material specifications, building code if any, customer specifications, type of service and a thousand other things that will serve us and will shed light on the nature of the problem and this will give us more data to help them in the most efficient way. possible, you see the problem live, we will have a more or less clear idea as you provide the largest and best amount of information ion, WE DON'T GUESS FOR MANY YEARS THAT WE HAVE EXPERIENCE.
Thanks for understanding.
Cheers!.

El vie, 18 dic 2020 a las 22:39, Ramin Kondori (<raminkondori@gmail.com>) escribió:
Dear Thanh,

Aside from code requirements, it depends on toughness requirements for the job (Impact test).
The welding procedure qualification for LTCS materials (e.g. A333) normally includes impact testing (e.g. at -48C); and without PWHT, it is not easy to pass this test and in the end, you have to perform PWHT to have your PQR approved. Most probably, you have to perform PWHT on all thicknesses. 

Regards  
Ramin  Kondori
Sr. QA/QC & Welding Engineer
-----------------------------------------------------------
PG-Dip. in Welding Engineering (IWE  AT  0070)
BSc. in Civil Engineering (IUT)
BGAS Painting Inspector
ASNT Level I&II
                        
IIW-Logo-Colour-small


On Thu, Dec 17, 2020 at 7:17 AM thanh tung Nguyen <tungexp.268@gmail.com> wrote:
Dear Experts,

Hope you all are well.

I have a question is about the weld of the base material of CS (or Low temp. CS) with wall thickness greater than 25mm, Do we still required PWHT if we applied a preheating process before, or PWHT is no longer mandatory?

And which reference can be found?

Thank you & best regards./.

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SUMMIT MÉXICO - TPI

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Móvil +52 1 812 352 4606

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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...