Thickness for impact testing
manpreet
My case is
Material- Low carbon steel
Applicable code: ASME B 31.3
According to ASME IX QW-403.6, the minimum base metal thickness qulified is the thickness of test coupon T or 0.625" (5/8"), whichever is less. That is 0.5". Therefore, the thickness range 0.25"-0.5" is not qualified.
But the vendor pointed out the the qualified thickness range can based on fabrication code B31.3 Table 323.3.1 which indicates that qualifed thickness range is T/2 to T+0.25".
In this case, what is the minimum qulified thickness: 0.25" or 0.5"? Please advise.
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raghura...@gmail.com
B31.3 thicknesses applicable for PTC and ASME for PQR. Both shall be satisfied.
Prabhu Kumar L
Please note that for LTCS piping, it is mandatory to comply the requirements of Table 323.2.1 (Welding procedure qualification) and Table 323.3.1 (Weld production testing) like pressure vessels as per Sec. VIII Div. 1.
For your case, please refer to Note -2 of Table 323.2.2, which indicates that production weld testing can be preformed as a part of welding procedure qualification, provided it shall meet all the requirements as stated in Table 323.3.1 including thickness limitations i.e. T/2 to T+6mm.
You need to segregate the thickness ranges involved for LTCS piping and accordingly you need to qualify or support the existing PQR to meet the above thickness limitation.
Regards,
L. Prabhu kumar,
Sr. Principal Engineer,
Equipments & Materials Dept.,
Saipem India Projects Limited,
Nungambakkam High Road, Chennai - 600 034, India.
Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,
Mobile Ph. No.: +91 9003010978.
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of manpreet
Sent: Wednesday, May 26, 2010
12:02 PM
To: material...@googlegroups.com
Subject: [MW:5253] Thickness for
impact testing
Dear All
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Shashank Vagal
Manpreet,
Sec IX when referred to for procedure qualification by proving weld inegrity with applicale quality tests is meant for any welding done with the parameters as collected from the PQR. (pWPS -> PQR -> WPS). What ranges you see there (dia, thkns, P, G, F etc) are meant for the welder. So, in your case, to enable the welder to weld 0.25" to 0.5" you have to select a test coupon of 0.25" thick and test him to the parameters of the WPS.
In short, for the present, your WPS is qualified but not the welder.
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B.Vaithiyanathan
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With Best Regards
B.Vaithiyanathan