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### Thickness of Pipe Blanks Caps Formula and Calculator

Design Thickness of Pipe Blanks Caps Formula and Calculator per. ASME B31.5

The pressure design thickness of permanent blanks (see Fig. 1, 2 and 3) shall be calculated in accordance with eqs. (1) and (2).

Eq. 1
t = [ 3 P / ( 16 S ) ]1/2

Eq. 2
tm = t + c

Eq. 3
P = 16 S t2 / 3

Where:

t = pressure design thickness, in. (mm).
tm = minimum required blind flange thickness, satisfying requirements for pressure and mechanical, corrosion, and erosion allowances, in. (mm)
ds
= inside diameter of gasket for raised or flat (plain) face flanges, or the gasket pitch diameter for retained gasketed flanges, in. (mm).
P = internal design pressure , psi (kPa), or external design pressure , psi (kPa).
S = applicable allowable stress, psi (MPa).
c = sum of the mechanical, corrosion, and erosion allowances, in. (mm) ASME Blank Type 1 ASME Blank Type 2 ASME Blank Type 3

Related:

Reference:

• ASME Code for Pressure Piping, B31.5, Refrigeration Piping and Heat Transfer Components