Hydro Test of Lines - CR4 Discussion Thread

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saggitarius Participant Join Date: Sep 2012 Posts: 1	Hydro Test of Lines 09/20/2012 6:20 AM
	During hydro testing of process lines,which type of valves will be excluded and which valve will b included in test pack?
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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: hydro test of lines 09/20/2012 7:02 AM
	Exclude the ones that don't need to be leak-tested. __________________ "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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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: hydro test of lines 09/20/2012 7:25 AM
	__________________ "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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CaptMoosie Guru Join Date: May 2009 Location: Red Hook, New York (Mid-Hudson River Valley) Posts: 4362 Good Answers: 179	#3 Re: Hydro Test of Lines 09/20/2012 9:17 AM
	Check with the applicable standards. If it's water system process piping, check the AWWA (or similar) standards. If it's petroleum processing, I believe the API standards apply. Etc etc etc __________________ "Veni, Vidi, Vici"; hendiatris attributed to Gaius Julius Caesar, 47 B.C.
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Anonymous Poster #1	#4 Re: Hydro Test of Lines 09/21/2012 8:58 AM
	wadid..... It has been my experience dealing with ASME B31.1 and B31.3 power and process chemical lines, that most valves are included in the hydrotest program.....and most of the testing done on these valves is in the open position. The only type of valve that should be excluded from piping system hydrotesting are safety and relief valves. The flanged connection should be blanked off. Rupture disks, of course, should not be included in the test. It is important to point out that many valves CANNOT form part of the hydrotest boundary if they are to be used in the CLOSED POSITION ! (i.e. pressure on one side of the valve) This is a common newbie mistake ! The same valve can be safely hydotested if open. Consult the valve manufacturer's specifications for more information.
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Anonymous Poster (1); CaptMoosie (1); PWSlack (2)

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