12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
(OP)
I received a request for a 400 barrel storage tank set at a 5 psi pressure rating. The original design code specified API 12D. I explained that his code does not cover a 400 BBL tank and definitely not a tank with a 5 psi working pressure. I suggested that this piece of equipment be treated as a pressure vessel and be constructed to the set of codes governing this design.
I inquired if anyone had submitted a tank designed to 5 psi and there was one. The design code was a API 12F/650/620. I don't believe you can mix and match these codes to suit a specific project.
I realize that 12F and 650 cannot be used to design a tank to 5 psi pressure. And as I interpret API 620, it is for large storage tank with low internal pressures, so a small tank such as this would not meet the requirements as laid out in the specification.
Sorry, to ramble on. I am just wondering if my interpretation of these codes is correct and to confirm if I led this gentleman in the right direction. Any addition suggestions or interpretations would certainly be appreciated.
Thank you.
I inquired if anyone had submitted a tank designed to 5 psi and there was one. The design code was a API 12F/650/620. I don't believe you can mix and match these codes to suit a specific project.
I realize that 12F and 650 cannot be used to design a tank to 5 psi pressure. And as I interpret API 620, it is for large storage tank with low internal pressures, so a small tank such as this would not meet the requirements as laid out in the specification.
Sorry, to ramble on. I am just wondering if my interpretation of these codes is correct and to confirm if I led this gentleman in the right direction. Any addition suggestions or interpretations would certainly be appreciated.
Thank you.





RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
Then again, I'm married to an attorney, so maybe I'm just hung up on looking for loopholes. :)
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
400 barrels eh ?.... Hmmmmmm thats about 17,000 gallons which would fit (about) in a horizontal tank 12' diameter and about 20 feet long......a shop built tank
You could get such a tank designed, tested and certified in accordance with API 620 OR designed, fabricated and tested to ASME VIII (without the ASME code stamp)
The price, either way would be about the same....
Talk with the people at Modern Welding in Newark, Ohio (www.modweldco.com) and they will help you out. A nice guy by the name of Tom Griggs has been very helpful to me...
Good luck
MJC
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
Would a 12ft dia. x 24ft long, full of water, atmospheric, saddle supported, be made of .140in thick stainless 304 typical plate? For heads, conical, 75 deg. half-apex angle, and full rings are used over and between the saddles, to avoid ovalling.
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
In my experience, a tank your size made from CS is slightly cheaper if it is built to ASME Section VII rather than API 620, even if it is code stamped. Also, I found that if you use 3/8" plate and get the design pressure high enough, your relief valve is much smaller and you can use an existing LP header for a fire size case rather than a huge discharge line and atmospheric vent pole.
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
Buried somewhere in API-620 is a statement that it may also be used for horizontal tanks. It's hard to find, but it's there.
Steve Braune
Tank Industry Consultants
www.tankindustry.com
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
www.mass.gov/dfs/osfm/fireprevention/cmr/527009.pdf
RE: 12'-0" diameter 400 BBL Storage Tank set @ 5psi working pressure
The more you learn, the less you are certain of.