Testing a Nitrogen Pipeline

7 comments

Rate

Anonymous Poster	Testing a Nitrogen Pipeline 05/18/2009 8:04 AM
	Hi gurus, Can i test the pipe line with nitrogen as per allowable hydrostatic pressure to avoid hydrotesting,which precuation i need to be taken and which standard allow me to do?
	Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

These comments received enough positive votes to make them "good answers".

user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#1 Re: Testing of pipe line with Nitrogen to avoid hydrotesting 05/18/2009 8:16 AM
	Surely the point of hydrostatic testing is that it's safer than using a gas? Gas can give you an explosion as it expands...A hydrostatic failure can still be nasty but you are more likely to get a gush or a flood or a crack rather than a bang... Please correct me if I'm wrong someone. Del __________________ health warning: These posts may contain traces of nut.
	Reply Good Answer (Score 2)

saleem arain Participant Join Date: May 2009 Location: pakistan Posts: 1	#2 In reply to #1 Re: Testing of pipe line with Nitrogen to avoid hydrotesting 05/18/2009 8:43 AM
	hi, thanks for reply.i agree with you that nitrogen can be caused of burst and can i say it is unpractical due to safety point of view but think about it that if suppose it is gas line then it will work on working pressure.then what???????
	Reply Off Topic (Score 5)

user-deleted-1105 Guru Join Date: May 2007 Location: Harlow England Posts: 16512 Good Answers: 670	#3 In reply to #2 Re: Testing of pipe line with Nitrogen to avoid hydrotesting 05/18/2009 8:47 AM
	D'uh? The whole point of testing with something safe at a pressure which exceeds the working pressure, is to avoid a failure when the line is actually working with gas. Someone help me out here please...fast! Del __________________ health warning: These posts may contain traces of nut.
	Reply Off Topic (Score 5)

Bill Guru Join Date: Dec 2005 Location: Clemson, South Carolina Posts: 1722 Good Answers: 18	#5 In reply to #3 Re: Testing of pipe line with Nitrogen to avoid hydrotesting 05/18/2009 10:46 AM
	"D'uh" says it pretty well. Nitrogen gas compresses -- water doesn't (much); when bursts occur, water quits blowing out after pressure is released (almost immediately) -- nitrogen does not quit blowing out when rupture occurs; it only quits blowing out when pressure inside pipe is same as outside pipe. Size of hole and pressure of nitrogen determines speed at which one gets head cut off by blow-out. Leaks show up easily with water -- leaks do not show up easily with nitrogen. __________________ We have met the enemy and he is us . . . Walt Kelly
	Reply Off Topic (Score 5)

Anonymous Poster	#4 Re: Testing a Nitrogen Pipeline 05/18/2009 9:57 AM
	No, no. You're doing fine. We'll just be sitting quietly over here, watching the proceedings.
	Reply

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	#6 Re: Testing a Nitrogen Pipeline 05/19/2009 4:00 AM
	The whole point of hydraulic testing is to prove the assembly will withstand the maximum operating pressure plus a healthy safety margin, before the operating fluid is introduced. Google photographs of "boiler explosions" to see what sort of damage can ensue otherwise. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Reply

Bill Guru Join Date: Dec 2005 Location: Clemson, South Carolina Posts: 1722 Good Answers: 18	#7 In reply to #6 Re: Testing a Nitrogen Pipeline 05/19/2009 8:10 AM
	Boiler explosions . . . I remember from my youth (somewhere around 55 years ago ) that a laundry's boiler exploded about two miles away. The "boom" was incredibly loud, considering how far away it was, and it rattled the windows in the house. My father and brother and I jumped in the car and headed toward where the sound came from and found that it was the laundy that our family used for dry cleaning and with whose owners we were friends. There were broken windows in homes and other buildings as far as two city blocks away. The rear half of the laundry building was blown to smitherines. __________________ We have met the enemy and he is us . . . Walt Kelly
	Reply

These comments received enough positive votes to make them "good answers".

Copy to Clipboard

Anonymous Poster (1); Bill (2); PWSlack (1); saleem arain (1); user-deleted-1105 (2)

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (75 right now) Show Members