How to Determine Test Pressure

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Humph Active Contributor Join Date: May 2008 Posts: 13	How to Determine Test Pressure 04/03/2009 5:28 AM
	I need to carry out hydrotest on an AGO surface storage tank whose thickness, diameter and length are known. How can I determine the test pressure?
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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	#1 Re: Test Pressure 04/03/2009 7:20 AM
	The working pressure will be stated on the manufacturer's plate attached to it. The test pressure will be found on the insurance company's engineer/surveyor's report, which will be found in the General Register. __________________ "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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Humph Active Contributor Join Date: May 2008 Posts: 13	#2 Re: Test Pressure 04/03/2009 8:09 AM
	The tank in question is an old tank. There is no other information except that of thickness, diameter and length. I think a relationship between the wall thickness and working pressure might help.
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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	#3 In reply to #2 Re: Test Pressure 04/03/2009 9:16 AM
	If the test pressure is greater than about +2m of H₂O then involve the engineer/surveyor from the site's insurance company at the earliest opportunity. Get them to assess the tank and advise on test pressures. __________________ "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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XMech Power-User Join Date: Jan 2009 Location: Western Canada Posts: 295 Good Answers: 51	#4 In reply to #2 Re: Test Pressure 04/03/2009 11:37 PM
	Is the tank open or closed roof? What style of roof (conical, hemispherical, .. )? I hope it is welded construction and not old enough to be riveted? Atmospheric or pressurized? What does/did the tank contain? Do you know the code it was constructed to? API 650, API 620, AWWA, EN 14015, ................? What do you propose to store in this tank now? (Basically what I am trying to say is - there is no way we can give you an answer, especially with the limited information you have given us. It would be best to speak with your jurisdiction/insurer as PWSlack has proposed.) __________________ A little knowledge is a dangerous thing.
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Humph (1); PWSlack (2); XMech (1)

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