Y-Shevy
Mechanical
- Aug 1, 2018
- 6
Hi folks,
I am currently calculating the required thickness for a a custom blind flange (test plate) for our internal hydro shell test (1.5xDP). I normally refer to 12516-2 section 8.2 to determine the thickness (hc) either when the plate is with or without concentric opening (8.2.2 & 8.2.3 respectively). I was pleased with the calculation however, I can't meet the first condition as per 8.2.1:
"The following formulae apply to plates with a plate thickness hc / diameter dD ratio ≤ 1/4.".
My calculation is giving a ratio of approx. 0.4, which is way off the mark. My question is; why is this condition required? I would of thought that the thicker the plate the more rigid (less rounding) and less likely to leak during test (or operation)? I can't change the seal diameter (RTJ) and hc is the resulting calcution (min required thickness).
Ref; The valve flange is a custom high pressure design (beyond the scope of ASME B16.5 flange standard).
I am currently calculating the required thickness for a a custom blind flange (test plate) for our internal hydro shell test (1.5xDP). I normally refer to 12516-2 section 8.2 to determine the thickness (hc) either when the plate is with or without concentric opening (8.2.2 & 8.2.3 respectively). I was pleased with the calculation however, I can't meet the first condition as per 8.2.1:
"The following formulae apply to plates with a plate thickness hc / diameter dD ratio ≤ 1/4.".
My calculation is giving a ratio of approx. 0.4, which is way off the mark. My question is; why is this condition required? I would of thought that the thicker the plate the more rigid (less rounding) and less likely to leak during test (or operation)? I can't change the seal diameter (RTJ) and hc is the resulting calcution (min required thickness).
Ref; The valve flange is a custom high pressure design (beyond the scope of ASME B16.5 flange standard).
