Re: [MW:7924] Re: [MW: 7921] MW: 7874- PWHT

Hi, Throat thickness = not less than 6mm or 0.7xt (Minimum) (t - thickness of header pipe) Thanks & regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Fri, 10/29/10, Ganesan s/o Nallamthamby <ganesan.qad@jspl.com.sg> wrote: From: Ganesan s/o Nallamthamby <ganesan.qad@jspl.com.sg> Subject: [MW:7923] Re: [MW: 7921] MW: 7874- PWHT To: materials-welding@googlegroups.com Date: Friday, October 29, 2010, 11:12 AM Dear Pradip Is there standard formula to calculate throat Thichness for sit-on / sit-in branch connections? Thanks With Best Regards Ganesan QA Engineer Mobi - 1707 HP - 9189 6531 -----Original Message----- From: "pgoswami" <pgoswami@quickclic.net> To: materials-welding@googlegroups.com Date: 29/10/2010 11:58 Subject: [MW:7921] MW: 7874- PWHT Redouane, In B-31.3 code,for branch connection PWHT criteria is as follows:- 331.1.3 Governing Thickness for Heat Treatment.When components are joined by welding, the thickness to be used in applying the heat treatment provisions of Table 331.1.1 shall be that of the thicker component measured at the joint, except as follows: (a)In the case of branch connections, whether anintegral part of a branch fitting or attached as a reinforcingpad or saddle, heat treatment is required, as follows:- ( 1)Heat treatment is not required for P-No. 1 materials when weld throat thickness is 16 mm ( 5⁄8 in.) or less, regardless of base metal thickness. (2)not required for P-No. 3, 4, 5, or 10A materials when weld throat thickness is 13 mm (1⁄2in.) or less, regardless of base metal thickness, provided that not less than the recommended preheat is applied, and the specified minimum tensile strength of the base metal is less than 490 MPa (71 ksi). For weldolet, the weld joint would be a groove and fillet weld. Hence the throat thickness is important. Assuming the material of construction is Carbon Steel,if the throat thickness exceed the above , PWHT is necessary.   Thanks. Pradip Goswami,P.Eng. Welding & Metallurgical Specialist & Consultant Email-pgoswami@sympatico.ca, pgoswami@quickclic.net -----Original Message----- From: materials-welding@googlegroups.com [ mailto:materials-welding@googlegroups.com] On Behalf Of Brl Pp Sent: Wednesday, October 27, 2010 7:04 AM To: Materials & Welding Subject: [MW:7874] PWHT Good morning, Please see below the data of piping line for erection: - Diameter of pipe: 48" - Produced: liquefied natural gas. - Piping class: D41A - Piping thickness: 38mm. - Weldolet thickness : 15mm. - Design code: ASME B31. 3. 2008 Edition. - PWHT: By code. According to your experience, for this case we use the PWHT? If yes, please share your experience. Thanks in advance. My best regards. Redouane (Project engineer) Algeria -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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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.