Dear Meisam,
Thanks for your advice. Actually our designer consultant already specify this. His suggestion is to use WPHY 65 instead of 60. But our contractor require to use WPHY 60 with some argument as per below:
1. Point selection for material design should be based on SMYS not SMTS. Stress occurs in the material due to design pressure is not expected until at SMYS point, because if it gets to the point SMYS then the designer has failed. Its meaning that the material is deformed plastically and will not return to its original shape.
2. Barred tee to be installed on a pipeline section with material D2 (rating 600#), where this class material using pipes API5L Grade X60 which has a value of SMYS 60 ksi, so the flange & fitting material (included barred tee) should have a similar grade to the material that will be on joint pipe, the grade WPHY 60 for fittings and grade F60 for the flange, that both have a value 60 ksi also
Regarding your advice that 5 MPa below the pipeline SMTS (it means less than 1%) will not affect the job due to safety factor often has been used, can you give me some reference (standard or international literature)? Thanks in advance.
Regards,
Lukman Hakim
(QA/QC Engineer)
Dari: meisam shokri arfaei <meisamshokri@gmail.com>
Kepada: materials-welding@googlegroups.com
Dikirim: Selasa, 19 November 2013 11:43
Judul: Re: [MW:19300] Barred tee WPHY 60 joint to API 5L X60
Dear Friend,
Usually the designer should specify this, because he knows the consideration which lead to selecting a specific material or grade. First of all ask him but in your case, I think just 5MPa below the pipeline SMTS (it means less than 1%) will not affect the job due to safety factor often has been used.
Regards
On Mon, Nov 18, 2013 at 11:04 AM, lukman hakim <lukman_hakim1981@yahoo.com> wrote:
--Dear Expert,Can material barred tee grade WPHY 60 (SMYS: 415 MPa, SMTS: 515) joint to linepipe API 5L grade X60 (SMYS: 415 MPa, SMTS:520)? Or we shall use WPHY 65 (SMYS: 450 Mpa, SMTS: 530 Mpa) since SMTS barred tee below SMTS linepipe. Thanks in advance for any advice.Regards,
Lukman Hakim
(QA/QC Engineer)
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M. Shokri Arfaei
ISA-ISTS - Metallurgy Lab. Manager
ASNT NDT Level III
International Welding Engineer
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