[MW:7130] RE: 7119] ASME B31.3 thickness Range Issue

Limesh,

 

A general clarification: 

 

ASME Section IX represents a generic set of rules for weld and weldor qualification.  These rules may be further restricted by the fabrication/design Codes that specify qualification in accordance with Sc IX.  When additional restrictions (or exemptions for that matter) exist, they take precedence to Sc IX  requirements.   In this case the qualified thickness rules are more restrictive and will apply in lieu of the requirements provided in  Sc IX QW-451.1 and Sc IX QW-403.6.  Customer requirements, other Codes or Standards are handled similarly.   When you are presented with this situation, it may be beneficial to write multiple WPSs based on the applicable PQR(s) – one or more WPSs for the specific design/fabrication Code(s) incorporating all the additional restrictions and a general WPS meeting the requirements of Sc. IX.   

 

Hope this helps.

 

John

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M
Sent: Tuesday, September 21, 2010 1:09 AM
To: Materials & Welding
Subject: [MW:7119] ASME B31.3 thickness Range Issue

 

Dear All,

I want to prepare a WPS,

Design code – ASME B31.3, Welding Code- ASME BPV SEC IX

Material used during PQR - ASTM A 333Gr6 (P No.1 Gr. 1) To ASTM A 350-LF2 (P No.1 Gr. 2)

Thickness of test coupon – 23.8mm

Process – GTAW+SMAW

PWHT – Yes (600⁰C± 10⁰C)

Weld coupon Impact Tested – Yes

I have reviewed ASME BPV 2010 edition, QW403.6 it says "The minimum base metal thickness qualified is the thickness of the test coupon T or 5/8 in. (16mm), whichever is less.However, where T is less than ¼ in. (6mm), the minimum thickness qualified is 1/2T"

Then I reviewed QW.171.1 General."Charpy V-Notch impact test shall be made when required by other sections.QW171.2 Acceptance."The acceptance criteria shall be in accordance with that section specifying impact requirements"

Then I reviewed ASME B31.3, 2008 edition Table 323.3.1 Impact testing for materials.

A-5

"(a) One piece, thickness T, for each range of material thickness from T/2 to T+ 6 mm(1/4in.)"

 

"(b) Unless required by the engineering design, pieces need not be made from each lot, nor

from material for each job, provided that welds have been tested as required by

Section 4 above, for the same type and grade of material (or for the same PNumber

and Group Number in BPV Code, Section IX), and of the same thickness

range, and that records of the tests are made available."

 

In this case, what is the maximum and minimum base metal thickness range qualified? Which code clause I have to follow ASME BPV SEC IX or ASME B31.3?

 

Regards,

Limesh

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