Pre-straining of Pressure Vessels

[Dave06fea]

Hello,

Is there a guiline in terms of percentage of plastic strain to get in a pressure vessel during a pre-straining test in order to limit the plastic deformation during pressure test or operation?

Is there something about pre-straining in the ASME? If so, what reference?

Thank you.

Dave

 

[TGS4]

I have worked with pressure vessels and ASME for a long time and I have not yet heard the term "pre-straining". Please elaborate on what this is, the rationale for doing so, and what one would expect to achieve.

You're not talking about autofrettage, are you? What Section and Division of the Code are you referring to?

 

[metengr]

Look at ASME Section VIII, Div 1, Code Case 2596.

 

[metalonis]

I assume you are referring to autofrettage. Article KD-510 of Section VIII Division 3 states that “… the permanent tangential strain at the bore surface resulting from the autofrettage operation shall not exceed 2%.”

 

[Dave06fea]

Many thanks metengr and metalonis.