Paddle Blind Thickness per ASME VIII UG-34
Calculates minimum thickness for skillets (paddle blinds), spectacle blinds, and line blanks used for positive isolation in piping systems. Based on flat plate bending under uniform pressure per ASME Section VIII Div 1.
Design Parameters
psig
psi
Per ASME II Part D: S = SMYS ÷ 4 at design temperature
in
Formula (ASME VIII UG-34)
t = d × √(C × P / S)
t = Min. Thickness (in)
d = Inside Diameter (in)
C = Attachment Factor
P = Design Pressure (psig)
S = Allowable Stress (psi)
C-Factor (UG-34):
0.13 = Bolted, gasket inside bolt circle
0.30 = Full-face gasket to edge
0.33 = Welded or integral edge
📚 Learn the Theory
Detailed guide to blind flange design per ASME VIII, flat plate stress analysis, and material selection for line blanks.