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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).

Preview: Design Thickness of Pipe Blanks Calculator

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

Eq. 2
t_m = t + c

Eq. 3
P = ( t / d_g )² (16 · S ) / 3

Where:

t = pressure design thickness, in. (mm).
t_m = minimum required blind flange thickness, satisfying requirements for pressure and mechanical, corrosion, and erosion allowances, in. (mm)
d_g = 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

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Reference:

• ASME Code for Pressure Piping, B31.5, Refrigeration Piping and Heat Transfer Components, Paragraph 504.5.3