API 650 Appendix F Internal Pressure requirement issue

[mechanicaldude400]

Hello,

I was wondering if someone could could help me out with a API 650 code issue I am having in regards to appendix F, designing tanks with small internal pressures:


I am designing a tank where the internal pressures exceed the weight of the shell, roof, and framing but do not exceed 18 kPa. Does this mean that only the requirements in F.7 are applicable and the requirements in F.3 through F.6 are not applicable?

Any help is appreciated.

Thanks,

 

[JStephen]

Generally so. What is it specifically you're wondering about?

Once you get into F.7, it refers you back to API-620, so you have some similar requirements for area and all. To design the anchorage, you need to calculate a failure pressure, and if you don't use the method in F.6, then the standard leaves you without any guidance on how to do it.

 

[hsevp]

What is the outlook/ expected trend for api tank repair over the next 5-10 years? Have the regulatory changes in 2004, etc. started to drive more inspections thus more repairs?