Vacuum for Storage Tank API 650 and API 620?

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cxcxcx0505 Associate Join Date: Mar 2012 Posts: 34	Vacuum for Storage Tank API 650 and API 620? 10/24/2013 11:31 PM
	Hi All, Does API 650 and API 620 allow atmospheric storage tank to be design with full vacuum? Thanks.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Vacuum for storage tank API 650 and API 620? 10/25/2013 12:15 AM
	What do you think? Have you analyzed the requirements of each? Here's what I think: Railroad Tank Car Implosion Experiment If it isn't done right.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: Vacuum for storage tank API 650 and API 620? 10/25/2013 3:30 AM
	Well, if it were an <...atmospheric storage tank...> under API650, then it wouldn't be rated for vacuum at all. So change the process requirements before the Mechanical Engineering to follow it up sends the Engineer doo-lally. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#3 Re: Vacuum for storage tank API 650 and API 620? 10/25/2013 4:13 AM
	Why would they prevent anyone from designing a tank even more stringently than needed? __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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MJCronin Power-User Join Date: Oct 2009 Location: Central Midwest Posts: 455 Good Answers: 38	#4 Re: Vacuum for storage tank API 650 and API 620? 10/25/2013 7:13 AM
	cxcx..... I am guessing here that this is your first involvement with tanks. API 650 and 620 are design codes for economical flat bottomed tanks If you need to store liquids at near atmospheric pressures, then API 650 and 620 should be followed. If your process design truly needs storage at more that a couple of inches of vacuum, then you should consider the more expensive tanks built to ASME Section VIII (or similar code)with dished ends. Lets make sure that you are not being misled by PIDs from newbie process engineers who do not understand plant equipment design __________________ We have met the enemy....and he is us. POGO
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user-deleted-1100 Commentator Join Date: Aug 2007 Posts: 97 Good Answers: 3	#5 Re: Vacuum for Storage Tank API 650 and API 620? 11/26/2013 6:07 AM
	If I could understand the meaning of vacuum is the place with absence of air or gas. API 650 and 620 are made to store liquid, more specifically crude oil, furnace oil, diesel oil etc. If the tank is half filled or left 2" empty on the top, it cannot be called that unfilled tank is under vacuum. Either air or gas produced by the liquid would fill the space and there would be no vacuum in the tank. If you create vacuum in the tank, it might implode, depending up on shell plate thickness.
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