Hi All,
One problem we have here is we have a vessel designed to 10.2Mpa at 38 degree C, fitted with CL600 A105 WN flange. You may notice this vessel is designed at max flange design pressure as per B16.5.
Now the problem is that client want to increase the design temp to 60 degree C. Where according to B16.5 CL600 A105 flange is only rated at 9.3 Mpa.
I have done my calculation as per AS1210 for flanges(very similar calculation to ASME appendix 2 calculation), with the assumption of no external load, surprisingly this CL600 A105 flange is ok to use at 10.2Mpa at 60 degree.
The question is, there are external loading on the nozzles,
Fx, Fy, Fz and Mx, My, Mz.
I have done some search, suggesting convert external load to an equivalent pressure:
Pe=4*F/Pi*G^2+16*M/Pi*G^3
for F to be used in the equation, should I just use axial tensile load Fy?
Where shear force Fx and Fz, at flange face won't have impact on the calculation result?
for M, I am confused which value to use, I think torsional moment My will have no impact on this case, and should use M=Mx+Mz, as they are both bending moment.
Please correct me if I am wrong at any point.
Thanks in advance
Regards
Spoonful.
One problem we have here is we have a vessel designed to 10.2Mpa at 38 degree C, fitted with CL600 A105 WN flange. You may notice this vessel is designed at max flange design pressure as per B16.5.
Now the problem is that client want to increase the design temp to 60 degree C. Where according to B16.5 CL600 A105 flange is only rated at 9.3 Mpa.
I have done my calculation as per AS1210 for flanges(very similar calculation to ASME appendix 2 calculation), with the assumption of no external load, surprisingly this CL600 A105 flange is ok to use at 10.2Mpa at 60 degree.
The question is, there are external loading on the nozzles,
Fx, Fy, Fz and Mx, My, Mz.
I have done some search, suggesting convert external load to an equivalent pressure:
Pe=4*F/Pi*G^2+16*M/Pi*G^3
for F to be used in the equation, should I just use axial tensile load Fy?
Where shear force Fx and Fz, at flange face won't have impact on the calculation result?
for M, I am confused which value to use, I think torsional moment My will have no impact on this case, and should use M=Mx+Mz, as they are both bending moment.
Please correct me if I am wrong at any point.
Thanks in advance
Regards
Spoonful.