Nominal thickness for impact test 1

[svi]

What should be the nominal thickness to be used to determine whether impact testing is required or not, for WN flanges. In ASME B31.3 Fig 323.2.2A note 6 says, "For blind flanges and blanks, T shall be 1?4 of the flange thickness." Is it the hub end thickness or the flange thickness to be used?

 

[metengr]

Flange thickness....

T shall be 1?4 of the flange thickness

 

[svi]

Wonder why the code addressed only blind flanges and spacers in the note.

 

[svi]

I think there may be a reasoning for the code saying only blind and spacers. They are pressure containing components as against the ring of a WN flange and therefore the inclusion of only those components.

 

[trottiey]

See Appendix J: T-bar is the nominal wall thickness of pipe.

T-bar of blind flanges and blanks would be undefined if not for Note 6.