Impact testing 1

[qaqcmanager]

When I have an accumulator design ASME with a design temperature -39/+80°C is it than necessary to do impact testing on -40°C or is impact testing on -20° enough or is impact testing anyhow required? (and where can I find it?)
The material is 34CrMo4 (SA372GR.E CL70).

I hope anybody can give me an answer!

Regards,
Paul de Roij
Heijmans Industrieservice/Roks Montage Holland

 

[robsalv]

Refer to the exemption curves in the relevant ASME code, presumably ASME VIII. Thickness is the important parameter.

Cheers

Rob

 

[weldtek]

Please confirm the material type. Per ASME Sec II Part A, the nominal chemical composition of SA372 GrE Cl 70 is
.3 C/ .65 Mn/ 1 Cr / .2Mo

 

[metengr]

The impact testing for the accumulator tank would fall under ASME Section VIII, Div 1, Part UCS, UCS-66. Since SA-372 is the "Specification for Carbon and Alloy Steel Forgings for Thin-walled Pressure Vessels", and Grade E, Class 70 material is not listed under Curves B thru D in Figure UCS-66, Curve A would apply. You need to obtain the design wall thickness of the accumulator tank to determine if impact testing is exempted.