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Conference unifix::sailing

Title:	SAILING
Notice:	Please read Note 2.* before participating in this conference
Moderator:	UNIFIX::BERENS

Created:	Wed Jul 01 1992
Last Modified:	Mon Jun 02 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2299
Total number of notes:	20724

1159.0. "Exhaust System Needed" by RAIN::WHITCOMB () Thu Mar 23 1989 20:10

  
    	Has anyone out there ever fabricated an exhaust system out
    of stainless steel?  If so, I need your expertise and a few 
    questions answered. 
    
    	First what type of stainless should I use? The plumbing
    supply house I patronize has #304 and the owner assures me
    that it has the same characteristics as #316.
    
    	Second, will stainless take the type of heat produced
    by diesel exhaust or will it break down or something? It will
    have to be welded together so it should be able to stand some
    heat.
    
    	Third, will I need special welding rods to weld it and
    can I weld to it specialised flanges that already exist that are 
    not made of stainless? If so, will these joints be subject
    to corrosion because they will be of disimilar metals? 
    
        I guess I could go ahead and fabricate what I need out of
    regular steel but the last one only lasted a little over five
    years and I really dont want to go thru this but once. Thus,
    any help will be greatly appreciated.
    
    
    John W.

T.R Title User Personal
Name Date Lines

1159.1 DNEAST::OKERHOLM_PAU Tue Apr 18 1989 13:13 42

T.R	Title	User	Personal Name	Date	Lines
1159.1		DNEAST::OKERHOLM_PAU		`Tue Apr 18 1989 13:13`	42
	I am no expert but I was involved in solving some welding problems prior to joining DEC. Please take my response as quasi-knowledgeable. First what type of stainless should I use? The plumbing supply house I patronize has #304 and the owner assures me that it has the same characteristics as #316. <<The difference I believe is in the amount of nickel in the alloy. >> <<There is a difference in corrosion protection with 316 being better>> <<but I think 304 is good enough for this application ... certainly >> <<better than store bought exhaust systems. >> Second, will stainless take the type of heat produced by diesel exhaust or will it break down or something? It will have to be welded together so it should be able to stand some heat. <<No problem>> Third, will I need special welding rods to weld it and can I weld to it specialised flanges that already exist that are not made of stainless? If so, will these joints be subject to corrosion because they will be of disimilar metals? <<You will need special rods. They should be readily available >> <<at any good welding supply house. You could even torch weld >> <<if you prefer. >> <<You should fabricate SS flanges. >> <<The heat effected zone of the weld will be more susceptible >> <<to corrosion. I don't know if passivation would help or not.>> I hope this helps, Paul P.S. If you can find a good technical library I think the ASME and others put out volumes of reference manuals which would answer all your questions.

	I am no expert but I was involved in solving some welding problems
prior to joining DEC. Please take my response as quasi-knowledgeable.


    	First what type of stainless should I use? The plumbing
    supply house I patronize has #304 and the owner assures me
    that it has the same characteristics as #316.

	<<The difference I believe is in the amount of nickel in the alloy.  >>
	<<There is a difference in corrosion protection with 316 being better>>	
        <<but I think 304 is good enough for this application ... certainly  >>
	<<better than store bought exhaust systems. 			     >>

    	Second, will stainless take the type of heat produced
    by diesel exhaust or will it break down or something? It will
    have to be welded together so it should be able to stand some
    heat.
    
	<<No problem>>

    	Third, will I need special welding rods to weld it and
    can I weld to it specialised flanges that already exist that are 
    not made of stainless? If so, will these joints be subject
    to corrosion because they will be of disimilar metals? 
    
	<<You will need special rods. They should be readily available >>
	<<at any good welding supply house. You could even torch weld  >>
	<<if you prefer.					       >>

	<<You should fabricate SS flanges. >>

	<<The heat effected zone of the weld will be more susceptible >>
	<<to corrosion. I don't know if passivation would help or not.>>

	I hope this helps,
	Paul


	P.S.  If you can find a good technical library I think the ASME 
	and others put out volumes of reference manuals which would answer 
	all your questions.