Blind thickness Calculation
Blind thickness Calculation
(OP)
Is there a formula for calculating the thickness of a piping blind (i.e. Flange, Fig 8, line blind, etc) ? If so, what is the appropiate formula for each type?
Carlos
Carlos
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Blind thickness Calculation
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Blind thickness CalculationBlind thickness Calculation(OP)
Is there a formula for calculating the thickness of a piping blind (i.e. Flange, Fig 8, line blind, etc) ? If so, what is the appropiate formula for each type?
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RE: Blind thickness Calculation
Look at B31.3, paragraph 304.5.3:
The minimum required thickness for a blank shall be calculated by the following equation:
Tm = dg * ((3*P /16*SE) + c)^0.5
Tm = mininum required thickness
dg = inside diameter of gasket for raised or flat face flanges
dg = the gasket pitch diameter for ring joint and fully retained gasket flanges
S = the allowable stress from Appendix A
E = the weld quality factor See Tables A-1A and A-1B
P = design pressure (psig)
and the weld strength factor must be applied if there is a weld in the plate.
RE: Blind thickness Calculation
C = the corrosion allowance. Also use "C" to allow for impingement abrasion or other wasting of the blank thickness.
RE: Blind thickness Calculation
Just for clarity the formula given by John is for a line blind fitted between two flanges. It does not apply to a Blind Flange which is subjected to bolting moments.
RE: Blind thickness Calculation
The B31.3 formula is based on the solution to the differential equation developed by Poisson a few years ago. Since the situation is actually highly nonlinear from both a geometrical and material perspective, the B31.3 formula is also quite conservative. More reading at ht
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