PWHT for Sockolet/Weldolet Connection on Run pipe thk>19mm

[Bathula Raghuram (Mumbai - PIPING)]

Your under standing is correct both para 331.1.3 (a) and Fig 328.5.4D (1) are applicable in this case,

Also please note that PWHT is not required when weld throat thickness is equal or less than 16mm for P#1 materials (piping connections DN50 and smaller, it is DN40 in your case), regardless of base material thickness.

However it is general practice to carry out PWHT on all branch connections, when run pipe requires PWHT w.r.t to its nominal thickness.

Dimensions of self reinforced fittings, such as weldolet, sockolets can be found from respective manufacturer catalogue, one such is provided below for sockolet FYI.

Note: thou’ it is addressed to me thought of sharing in the forum for discussion, Appreciate more view on this from members

_____________________________________________
From: Undisclosed 
Sent: Thursday, January 03, 2008 6:28 PM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: PWHT in Weldolet welding?

Dear Raghuram,

  A quick question…….reply to me …pl add

Question:-   A sockolet ( say 1 ½” ) is welded to any PWHT pipe ( say a CS 6” Sch 80 thk 21.44 mm )  is welded .

Does this joint require PWHT ? Does the provisions of 331.1.3 (a ) is applicable.    if yes .what is the T(b) thickness in sketch one ( 325.5.4D sketch 1 ) for the scokolet. ???  Is it the actual thk ???    Where can I find the nominal thk. Of  the weldolet?  Pipedata pro doesn’t give the thk.

Best Regards,

[rajeshwar konna]

Dear Members

 

Can any one send me the basics of piping technology book/material.

 

regards

 

Konna

 

On 1/4/08, Bathula Raghuram (Mumbai - PIPING) <R.Ba...@ticb.com> wrote:

Your under standing is correct both para 331.1.3 (a) and Fig 328.5.4D (1) are applicable in this case,

Also please note that PWHT is not required when weld throat thickness is equal or less than 16mm for P#1 materials (piping connections DN50 and smaller, it is DN40 in your case), regardless of base material thickness.

However it is general practice to carry out PWHT on all branch connections , when run pipe requires PWHT w.r.t to its nominal thickness.

Dimensions of self reinforced fittings, such as weldolet, sockolet s can be found from respective manufacturer catalogue, one such is provided below for sockolet FYI.

Note: thou' it is addressed to me thought of sharing in the forum for discussion, Appreciate more view on this from members

_____________________________________________
From: Undisclosed  
Sent: Thursday, January 03, 2008 6:28 PM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: PWHT in Weldolet welding?

Dear Raghu ram,

  A quick question…….reply to me …pl add

Question:-   A sockolet ( say 1 ½" ) is welded to any PWHT pipe ( say a CS 6" Sch 80 thk 21.44 mm )  is welded .

Does this joint require PWHT ? Does the provisions of 331.1.3 (a ) is applicable.    if yes .what is the T(b) thickness in sketch one ( 325.5.4D sketch 1 ) for the scokolet. ???  Is it the actual thk ???    Where can I find the nominal thk. Of  the weldolet?  Pipedata pro doesn't give the thk.

Best Regards,

 

--
Regards



Rajeshwar.Konna

SABIC-E&PM

email:rajes...@sabic.com

Off:+966-3-340-1756

Mobile:+966563518676

[sajeev c.g]

PWHT is required w.r.t the nominal thickness of run pipe. As far as my interpretation you have to go for the calculation only if the run pipe thickness is less than or equal to 3/4inch.

 

The dimension Tb will be available from the sockolet manufacturer.

 

Sharing information

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[pjo...@technip.com]

Dear Raghu,

I have different interpretation. The para 331.1 reads as follows:

(a) In the case of branch connections, metal (other than weld metal) added as reinforcement, whether an integral part of a branch fitting or attached as a reinforcing pad or saddle, shall not be considered in determining heat treatment requirements. Heat treatment is required, however, when the thickness through the weld in any plane through the branch is greater than twice the minimum material thickness requiring heat treatment, even though the thickness of the components at the joint is less than the minimum thickness. Thickness through the weld for the details shown in Fig. 328.5.4D shall be computed using the following formulas:

Governing thickness for sketch (1) = Tb (O-let thickness at base) + tc (throat thickness)

As per the above para it is clear that for P=1, the heat treatment is required for governing thickness of 38mm (or 1.5-in. depending on the system followed) and above. Accordingl to this, the nominal thickness of Run pipe has nothing to do with PWHT. If you want to avoid the PWHT, you may use the above interpretation.

 

For above I referred 2004 ed. Of B31.3. And this moment, I do not know which is the latest one applicable. Other members may pl. contribute.

 

Best regards,

Prasad Joshi 
e-mail: pjo...@technip.com
Phone: +81-(0)45-506-4886

 

-----material...@googlegroups.com wrote: -----

To: material...@googlegroups.com
From: "sajeev c.g" <sajee...@yahoo.com>
Sent by: material...@googlegroups.com
Date: 08/01/2008 11:26PM
Subject: [MW:458] Re: PWHT for Sockolet/Weldolet Connection on Run pipe thk>19mm

PWHT is required w.r.t the nominal thickness of run pipe. As far as my interpretation you have to go for the calculation only if the run pipe thickness is less than or equal to 3/4inch.

The dimension Tb will be available from the sockolet manufacturer.

Sharing information

"Bathula Raghuram (Mumbai - PIPING)" <R.Ba...@ticb.com> wrote:

Your under standing is correct both para 331.1.3 (a) and Fig 328.5.4D (1) are applicable in this case ,

Also please note that PWHT is not required when weld throat thickness is equal or less than 16mm for P#1 materials (piping connections DN50 and smaller , it is DN40 in your case ) , regardless of base material thickness.

However it is genera l practice to carry out PWHT on all branch connections , when run pipe requires PWHT w.r.t to its nominal thickness.

Dimensions of self reinforced fittings, such as weldolet, sockolet s can be found from respective manufacturer catalogue, one such is provided below for sockolet FYI.

Note: thou ? it is addressed to me thought of sharing in the forum for discussion, Appreciate more view on this from members

_____________________________________________
From: Undisclosed  
Sent: Thursday, January 03, 2008 6:28 PM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: PWHT in Weldolet welding ?

Dear Raghu ram ,

  A quick question??.reply to me ?pl add

Question:-   A sockolet ( say 1 ½? ) is welded to any PWHT pipe ( say a CS 6? Sch 80 thk 21.44 mm )  is welded .

Does this joint require PWHT ? Does the provisions of 331.1.3 (a ) is applicable.    if yes .what is the T(b) thickness in sketch one ( 325.5.4D sketch 1 ) for the scokolet. ???  Is it the actual thk ???    Where can I find the nominal thk. Of  the weldolet?  Pipedata pro doesn?t give the thk.

Best Regards,

---

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[Ranasaria Shivanand Rajendra (NPCC)]

I also have the same interpretation for most of the common Olets where Sketch 1 of Fig. 328.5.4D is applicable

Thanks for sharing this.

 

However I feel Sketch 2 is applicable for Stub in type olets like sweepolets ( I have never used this type )  but I am not aware of any other type of Olet where Sketch 2 is applicable.

 

Normally So far I have preferred to specify PWHT for such branch fittings along with header

But In some cases Fabrication Yard has come back saying that they have missed PWHT of branch fitting I have indicated that it is not mandatory ( referring  the clause you have mentioned ) if it meets the sketch 1 fabrication detail.

 

Regards,

Rana

Shivanand R Ranasaria

Contact +971 2 502 2058

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[pjo...@technip.com]

The para 331.1.3 (a) is applicable to branch joints in general and not only to o-lets.

Sketch-2 will be applied to pipe-to-pipe joints which are normally stub-in type.

 

Best regards,

Prasad Joshi 
e-mail: pjo...@technip.com
Phone: +81-(0)45-506-4886

-----material...@googlegroups.com wrote: -----

To: <material...@googlegroups.com>
From: "Ranasaria Shivanand Rajendra (NPCC)" <ran...@npcc.ae>
Sent by: material...@googlegroups.com
Date: 09/01/2008 01:24PM
Subject: [MW:460] PWHT for Sockolet/Weldolet Connection on Run pipe thk>19mm

I also have the same interpretation for most of the common Olets where Sketch 1 of Fig. 328.5.4D is applicable

Thanks for sharing this.

 

However I feel Sketch 2 is applicable for Stub in type olets like sweepolets ( I have never used this type )  but I am not aware of any other type of Olet where Sketch 2 is applicable.

 

Normally So far I have preferred to specify PWHT for such branch fittings along with header

But In some cases Fabrication Yard has come back saying that they have missed PWHT of branch fitting I have indicated that it is not mandatory ( referring  the clause you have mentioned ) if it meets the sketch 1 fabrication detail.

 

Regards,

Rana

Shivanand R Ranasaria

Contact +971 2 502 2058

---

From: material...@googlegroups.com [mailto: material...@googlegroups.com ] On Behalf Of pjo...@technip.com
Sent: Wednesday, January 09, 2008 5:43 AM
To: material...@googlegroups.com
Subject: [MW:459] Re: PWHT for Sockolet/Weldolet Connection on Run pipe thk>19mm

Dear Raghu,

I have different interpretation. The para 331.1 reads as follows:

(a) In the case of branch connections, metal (other than weld metal) added as reinforcement, whether an integral part of a branch fitting or attached as a reinforcing pad or saddle, shall not be considered in determining heat treatment requirements. Heat treatment is required, however, when the thickness through the weld in any plane through the branch is greater than twice the minimum material thickness requiring heat treatment, even though the thickness of the components at the joint is less than the minimum thickness . Thickness through the weld for the details shown in Fig. 328.5.4D shall be computed using the following formulas:

= Tb (O-let thickness at base) + tc (throat thickness)

As per the above para it is clear that for P=1, the heat treatment is required for governing thickness of 38mm (or 1.5-in. depending on the system followed) and above. Accordingl to this, the nominal thickness of Run pipe has nothing to do with PWHT. If you want to avoid the PWHT, you may use the above interpretation.

 

For above I referred 2004 ed. Of B31.3. And this moment, I do not know which is the latest one applicable. Other members may pl. contribute.

 

Best regards,

Prasad Joshi 
e-mail:  pjo...@technip.com
Phone: +81-(0)45-506-4886

 

----- material...@googlegroups.com wrote: -----

[sajeev c.g]

Yes  it is correct my interpretation waswrong.

Sajeev

pjo...@technip.com wrote:

 

-----material...@googlegroups.com wrote: -----

Try it now.

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