Water Washing During Shutdown

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clperera Commentator Join Date: May 2010 Posts: 63	Water Washing During Shutdown 10/24/2011 2:14 AM
	The past practice in our LPG processing plant is to use raw water from the fire water system to clean pressure vessels of carbon steels during shutdowns. Although we have not experienced any serious corrosion issues for the past 30 years the internal trays have been observed with rust scales. The process is recovery of Propane, Butane and Naphtha from Associated gas. What is the best water quality to be used for cleaning pressure vessels during shutdowns. What damge can the raw water cause? Appreciate your expert advice please.
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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: Water Wasing During Shutdown 10/24/2011 7:15 AM
	It's not the water that is the problem, it's the stuff in it. What is the pH of this water? Has it had corrosion inhibitors dosed into it? What is the Total Settleable Solids? What is the particle size? __________________ "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: Water Washing During Shutdown 10/24/2011 10:35 AM
	Rust has no structural strength, so it is quite in order to flush it out with high pressure water jetting. __________________ "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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ChaoticIntellect Guru Join Date: Aug 2010 Posts: 714 Good Answers: 38	#3 Re: Water Washing During Shutdown 10/24/2011 2:40 PM
	Although we have not experienced any serious corrosion issues for the past 30 years... This sounds like a case of looking for a problem where there isn't one!! If the current practice has worked for 30 years, it sounds like an acceptable practice. __________________ Sometimes my thoughts are in a degree of order so high even I don't get it...
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Abdel Halim Galala Guru Join Date: Feb 2007 Location: Cairo, Egypt Posts: 1733 Good Answers: 248	#4 Re: Water Washing During Shutdown 10/24/2011 11:50 PM
	You can use the water for hydrotest, cleaning and flushing of LPG systems, but immediately after finishing the job you have to extremely discharge all water followed by drying with pressurized air until removing any moisture, then followed by purging with nitrogen before starting operation of plant. __________________ It is better to be defeated on principles, than to win on lies!
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vargaalex Power-User Join Date: Dec 2010 Location: Tulsa, OK Posts: 184 Good Answers: 2	#5 Re: Water Washing During Shutdown 10/25/2011 9:16 AM
	Since the system has been operational over 30 years, the rust could be associated with formation over time inside the vessels not from the pressure washing. I agree that pH and other factors in the water may help the rust formation, I believe that with rust cleaners and inhibitors and a good drying out it may work out for another 30 years.
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