Aside from maintaining a liquid level and making the tank bottom plate thicker, what other methods have been used to resist bottom vacuum on a vertical tank designed to API 650?
-MrTank
ôI have not failed. I've just found 10,000 ways that won't work.ö
-Thomas A. Edison
Are you trying to put a rathole on the shell to be able to weld the annular ring butt joints? I've never seen it done before.
-MrTank
ôI have not failed. I've just found 10,000 ways that won't work.ö
-Thomas A. Edison
You have to identify the moments and forces acting on the nozzle. Annex P does not care how these loads were created. You then have to identify the actual stresses and compare to your allowable stresses. You will be able to know if you need to add additional reinforcement or not.
-MrTank
ôI...
Thank you for your input guys. This is not a job but rather it is just for my own curiosity. In case I get asked, I already know what to answer based on your feedback. So feel free to answer.
Weldstan,
Yes I understand the concept of pressure head. Thanks.
JStepehen,
I have no problem hiring...
Thanks. What about the pressure? I assume it will be designed under API 620 as API 650 maxed out at 2.5 psi internal.
-MrTank
ôI have not failed. I've just found 10,000 ways that won't work.ö
-Thomas A. Edison
ASME VIII-I has a combo course for training. I would search through their website calendar for upcoming events. In 2012, they had it in New Orleans, LA (1 week).
API 650 also has a week training. Check their calender.
Also, do you use a commercial software? I know Compress also have seminars...
Hi Experts,
If natural gas is liquefied (methane CH4) at -260F and the transport pressure is 4 psi, should the mdmt be -260F and design pressure be higher than 4 psi?
-MrTank
ôI have not failed. I've just found 10,000 ways that won't work.ö
-Thomas A. Edison
IFR is correct. In addition, the temperatures can be found on API 650 Figure 4.2.
-MrTank
ôI have not failed. I've just found 10,000 ways that won't work.ö
-Thomas A. Edison
Fyi, before you use sa-36 for pressure vessel, read UCS-6. Sa-36 is not allowed for lethal service.
-MrTank
“I have not failed. I've just found 10,000 ways that won't work.”
-Thomas A. Edison
First of all, what is the software that you are using?
A higher computed MDMT means that you have specified a lower MDMT input in your design. You would have to read more on UG-20 and UCS 66 to fully understand this topic. Depending on the situation, you can get away with lower MDMT by doing...
First of all, you have to tell us what you mean by " deviations from STANDARDS stipulated in ASME B31.3". You have to be a little bit more precise in this area. I can not say yes or no in the deviation as I do not know particularly which case are you talking about.
-MrTank
“I have not failed...
In my experience, jurisdiction is always the king. Check the 2013 National Board Synopsis of Boiler and Pressure Vessel Laws, Rules and Regulations adapted by each state of the United States and provinces in Canada . Read the link that I have provided below and check the specific state or...
Agree. But be careful which SA350 LF2 to use as it has 2 classes. Class 1 is rated for -50 F and Class 2 is 0 F.
-MrTank
“I have not failed. I've just found 10,000 ways that won't work.”
-Thomas A. Edison
Nice job gsail. I would have done the same. It's more work but it is the right kind of work. How close were the nozzles and rings to each other? The third party firm might have produced questionable results too. I am not saying that they are wrong but until you visually inspect yourself that the...
