Recently when sizing a storage tank, found that the required thickness will be 51mm (2"), over the limit 45mm (1-3/4") thick as set in section 4.2.1.4 of API 650. The question is whether the maximum plate thickness 45mm is mandatory? If not, what additional requirements? If so, what is the...
Hi All,
Where can I find the exact requirement for the VT criteria in the Code? I checked Sec VIII, Div 1, Sec V and Sec IX, seems there is NO clear criteria for the visual examination. I mean that if there is quantitative requirements for the imperfection on the welds/seams such as undercut...
Hey folks,
Sometimes we noticed that the requirement of the MAWP limited by shells or heads instead of discontinuities like nozzles is stated either explicitely or indirectly.
What do you guys think of it? Please present whatever your thoughts from experiences.
Thanks in advance,
As recommended in API 650, the minimum design metal temperature is the lowest one-day temp plus 8 dC. However, does it apply to an electrically heat traced or immersion heater heated tank? Seems too conservative if there is temperature gauge installed to monitor the temperature.
Any comments or...
Anyone can help me find the frequecy formula for a spherical shell? Actually, it's just like a ball, supported by a skirt.
I can do a rough calc for the beam mode frequecy but not shell mode. Since there is no software and reference book, so need your help.
Thanks in advance,
Hi Guys,
What is the L-Grade S.S?
Why is it unnecessary to ask PMI testing for L-Grade S.S?
I am totally layman and need your guys help.
Thanks in advance,
In accordance with the code, if the half apex angle of a cone head or section is greater than 30 deg and without knuckle, special analysis needs to be done to prove the local stress (bending & membrane) is ok.
So is there anyone who did such special analysis based on the...
Hello Tom,
A question about how to use COMPRESS:
I am trying to design a vertical vessel with an internal conical section at the bottom 2:1 SE head.
The reason why I don't use a conical head at the bottom is the half cone angle is too big, almost 60 deg. So, in order to satisfy the process...
Hello,
Could anyone tell me how to design a conical section inside a cylindrical vessel?
As an internal part, the cone is not a pressure retaining part and located close to the bottom 2:1 SE head (estimated conical depth is close to the depth of elliptical head).
Note: in Compress, the cone...
