How Come Different Materials For the Same Process Service - CR4 Discussion Thread

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anky60 Active Contributor Join Date: Dec 2012 Posts: 13	How Come Different Materials For the Same Process Service 09/06/2013 12:14 AM
	in comparison to the orientation above, the material on 3 immediately joined spools are different and are listed in the same sequence as follows: 103CS1P:process (CS:A106 ) rating 300 RT:5% ( downstream of checkvalve) 106SJ1P:process (SS:321) rating 600 RT:100% (upstream of checkvalve) 103CL2P:Process(AS: 5CrMo) rating 300 RT:100%. (downstream of cs line) here is my question; 1 ,why are 3 different materials selected for the same process service without going through any special units or any addition of some chemicals , 2, if the process service is demanding then why cs (A106) is put right between SS321 and 5CrMo 3, and the operating temp varies way too much eg op temp on SS321(in the middle) is 383'c while it's 80 on the other two. __________________ anky60
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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: how come different materials for the same process service 09/06/2013 3:16 AM
	More significantly, why wasn't the difference picked up dusing the last HazOp Study? What else did the study overlook? What was the piping designer's response when the question was asked there? This individual might be the best person to ask. After all, the forum doesn't know what is in the pipe, its temperatures and 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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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#2 Re: how come different materials for the same process service 09/06/2013 4:13 AM
	Maybe it's a corrosion comparison test loop. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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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: how come different materials for the same process service 09/06/2013 4:21 AM
	A galvanic corrosion experiment? Possibly! __________________ "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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IdeaSmith Guru Join Date: Mar 2012 Location: Out of your mind! Not in sight! Posts: 4424 Good Answers: 108	#4 Re: how come different materials for the same process service 09/06/2013 4:37 AM
	Honestly this is a question best brought up within the company and not here. There will maybe have to be a revision of said drawings and how would the designer know of it when it is presented here. I hope you raised this problem internally. All the best IS __________________ Common Sense Dictates
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IdeaSmith (1); PWSlack (2); Tornado (1)

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