Charpy impact test values for A 694 Gr 65 material

[AshaPatel]

Does body knows form where we get the requirement values for minimum average absorbed energy and minimum individual absorbed energy for ASTM A 694 Gr.65 flange material? The values are not specified in the ASTM A 694 specification.

 

[SJones]

So get them from the fabrication or construction code, MSS SP-44, or ISO 15590-3.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[AshaPatel]

I refered both the code but it is not specified.

 

[metengr]

OR you provide your own acceptance impact values for design conditions and test the material for acceptance.

 

[SJones]

OK, so let's wind this back a bit. Which document is asking for a Charpy test, and who specified that this document be used?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[nickypaliwal]

Can we use ASTM Grades as A694 for ISO flanges? Are there additional requirements that need to be checked?

 

[SJones]

If the customer orders a flange to meet ISO 15590-3 requirements, they will expect to see compliance with ISO 15590-3 on the inspection documents. Seeing just ASTM A694 will not make them happy. So, someone will have to check the requirements of both standards and ascertain whether it can be dual certified. I wish them well in that task.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[weldstan]

There was an old Battelle equation linking required minimum Charpy absorbed energy values to SMYS. While I forget the specific equation, the minimum absorbed energy would be approximately 25/20 ft-lbs at a specified temp.

 

[SJones]

@weldstan

Was it simply ((SMYS in MPa)/10) Joules?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[weldstan]

If memory serves, I think it was SMYS - 10Ksi / 2 as an approximation in ft-lbs minimum average. It's been over 35 years since I last used the data and I was more involved at that time using other equations for determining minimum absorbed energy to preclude ductile shear fracture in gas pipelines.

I believe that I also saw your equation as well.