Re: [MW:22376] Re: MATERIAL GROUPING IN API RP2A

In one of the Project (Subsea)CEQ was 0.42, We raised TQ, but disposition TOTAL asked do on same material WPQ and accepted based on the result.
Regards,
S.SENTHILKUMAR

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On Mon, 24/11/14, Sergio Antonio Muñoz Pinzón <seanmup@gmail.com> wrote:

Subject: [MW:22345] Re: MATERIAL GROUPING IN API RP2A
To: materials-welding@googlegroups.com
Date: Monday, 24 November, 2014, 1:54 PM

Ali,
0,45% CEq is not so high, it's an
intermediate value, cracking could appear in steels with
different CEq (low or high) if non adequate welding
procedure is used.Material selection for each
element depends on the particular design considerations
(loads, temperature, corrosion consideration, etc), if the
legs are going to be exposed to low temperatures design must
take this in consideration, choosing an improved toughness
material.
Sergio

El lunes, 24 de noviembre de 2014 03:19:08 UTC-5, Ali
Asghari escribió:Dear
SergioThank you for responding.
1-I think Carbon
equivalent ranges of up to 0.45% and higher is
permitted due to limitation of strength. because even
welding use low hydrogen in higher this range the
possibility of cracking is high. 2-Do
you have any design reference about category of redundancy
of structural member or critically of them. because in
previous projects acc. to AGIP or TOTAL spec. these items
are primary members and in 8.3.1,8.3.2 use of class A,B or
improved toughness property is recommended for
legs. 3- Do you have any example about
 application of 11.1.3 b(fabrication
sequence)?Regards.




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