Tuesday, August 30, 2011

Re: [MW:12325] Code Explanations

Philip,

I just finished working on a project with the same material specification (USAN Project)

You did not mention the welding process you intend to use as that will determine the choice of consumable. API 2W Gr. 50 (TMCP) is design to have an improved Impact property at low temperature.

With reference to your query,

1.      The thickness combination especially the T1 (Bevelled) will be selected in other to cover the thickness ranges in production. If the project specification refers you to AWS D1.1 code as a reference code without additional conditions, then refer to AWS D1.1 table 4.2 for your thickness selection. Using the standard pipe 8" sch. 80/sch. 140 (refer to figure 4.27) will qualify tubular diameter of 4" and above with thickness of 5mm to unlimited, but i know that your client specification might over ride this clause. Note that the thickness selected has little to do with the impact property but rather, your choice of consumable and the welding parameters will greatly influence the Impact values. AWS D1.1 clause 5.8 state that PWHT shall be carried out when required by contract document and clause 3.14 (2) stated that PWHT shall not be carried out on TMCP materials.

Note also that according to API 2W paragraph 1.2 stated "Due to the inherent characteristic of TMCP method, plates manufactured to this spec cannot be form or Post weld heat treated at temperatures above 1100°F (595°C) without some risk of sustaining irreversible and significant losses in strength and toughness".

2.       YES, this qualification will qualify welding on API 2MT1 gr. 50 because, they are both in the same group AWS D1.1 table 3.1 and their delivery condition is the same (TMCP). Both also have same weldability.

3.      Yes you can use a lower thickness. Note that according to ASME sec IX, the weld metal thickness t deposited during qualification qualified for 2t in production.

 

Regards,

Rems Okonkwo

Welding Engineer

Nigerdock Nig. PLC-FZE

Snake Island Integrated Free Zone

Apapa, Lagos, Nigeria



On Mon, Aug 29, 2011 at 10:16 AM, Philip, Taiye (Lagos) <Taiye.Philip@deltaafrik.com> wrote:

Hello Gents,

 I want to  carry out  a welding  procedure qualification testing for  welding jackets structural members, the applicable construction code is AWS D1.1. Project  material is API 2W Gr 50 pipe rolled from TMCP plates, and job  maximum thickness is 76.2mm,and project  requires  CVN testing at (-40°C).

1.      What will  be  the best combination of thickness ( T1 & T2 )for the pipes  to produce a TKY joint that will pass CVN testing at the above job required CVN testing temperature ?  will PWHT be applicable as per code? Also specify code references.

2.      Will these qualification qualifies welding on API 2MT1 Gr 50  pipes rolled from TMCP plates  with thickness 50.8mm with CVN requirement of (-30°C).

3.       I am required to make  a procedure for welding pressure vessel of thickness 75mm as per ASME VIII DIV 1,  project material is ASTM A 516 Gr 70 N  and project requires cvn testing at (-30°C), will it be possible  to qualify these procedure with a lesser thickness of the same material, will it  meet  the impact requirement  as per applicable  code? Please help with your contributions and provide applicable code references


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