Water Line Valves

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Sumit Basu Participant Join Date: Apr 2018 Posts: 3	Water Line Valves 04/27/2018 12:38 AM
	I am in the above industry. I find that most of the standards across the globe specify allowable stresses as 1/3 of YP to 1/5 of UST Many of these are old standards....but many of the valve components are cast. Considering the environmental issues I consider revision of these. Similar efforts on structural use of steel is on and moving rapidly. With rapid acceptance and validation of FEA think we must minimize use of energy guzzling cast iron
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truth is not a compromise Guru Join Date: Apr 2011 Posts: 8006 Good Answers: 286	#1 Re: water line valves 04/27/2018 3:57 AM
	"Energy guzzelling cast iron" Could you elaborate? Here are some estimates of energy required to produce vatious materials. It says nothing of part longevity, which obviously can have a large impact on ongoing cost. __________________ Eternal vigilance is the price of knowledge. - George Santayana
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phoenix911 Guru Join Date: Aug 2007 Posts: 23647 Good Answers: 420	#5 In reply to #1 Re: water line valves 04/27/2018 12:47 PM
	This was interesting, I had to check of what was told to me. Aluminum (from 100 % recycled aluminum): 11.35-17MJ (3,150 to 4,750 watt-hours) Aluminum (from a typical mix of 80% virgin and 20% recycled aluminum): 219 MJ (60,800 watt-hours) Aluminum (from bauxite): 227-342MJ (63,000 to 95,000 watt-hours) What was told to me, that it took more energy to produce aluminum from recycled aluminum that from bauxite. I'm always had a hard time believing that, but I never check... and now its settled. __________________ “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
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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 line valves 04/27/2018 4:41 AM
	_{Comment withdrawn.} __________________ "Did you get my e-mail?"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	#3 Re: Water Line Valves 04/27/2018 8:52 AM
	"The wonderful thing about <...standards...> are that there are so many to choose from." _{- Anonymous Poster #0} If a standard warrants revision then the correct course of action would be to contact the standards control body directly and seek involvement with like-minded peers when the revision date for the standard approaches. Lobbying/moaning at other CR4 readers would seem an unlikely strategy to yield any result. <unsubscribes> __________________ "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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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#4 Re: Water Line Valves 04/27/2018 12:40 PM
	From TINAC's table, in case you didn't look: Steel (from recycled steel): 6-15MJ (1,665 to 4,170 watt-hours). Iron (from iron ore): 20-25MJ (5,550 to 6,950 watt-hours) Steel (from iron): 20-50MJ (5,550 to 13,900 watt-hours)
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Jpfalt Guru Join Date: May 2016 Posts: 1746 Good Answers: 87	#6 Re: Water Line Valves 04/30/2018 3:36 PM
	I had an experience in the Navy with something like this. ASME code was considered too conservative, so an alternate standard similar to what you proposed was tried. The result was that the valve pressure boundary parts deflected under pressure and the valves failed to function due to loss of internal geometric dimensional control. You are deflection limited for proper function, not pressure boundary limited for pressure boundary integrity.
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