RE: [MW:5260] Thickness for impact testing

B31.3 thicknesses applicable for PTC and ASME for PQR. Both shall be satisfied.

-----Original Message-----
From: manpreet
Sent: 26/05/2010 12:01:46 pm
Subject: [MW:5253] Thickness for impact testing

Dear All

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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