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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...70-30 COPPER NICKEL PIPE AND FITTINGS70-30 COPPER NICKEL PIPE AND FITTINGS
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2/24/2004 9:00 AM
 
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I WORK ON THE DDG PROGRAM AT INGALLS SHIPYARD FOR THE US NAVY CIVIL SERVICE QA.RECENTLY A CHANGE WAS MADE IN THE FIRE MAIN AND SEA WATER PIPING SYSTEMS. THEY SWITCHED FROM 90-10 COPPER NICKEL TO 70-30 COPPER NICKEL[PIPE AND FITTINGS].THEY CHANGED BOTH IN THE FIRE MAIN SYSTEM.HOWEVER IN THE SEA WATER SYSTEM THEY CHANGED THE PIPE TO 70-30 COPPER NICKEL BUT LEFT THE ELBOWS AND FITIINGS 90-10 COPPER NICKEL IT SEEMS TO ME SOME BODY GOOFED BY NOT MAKING ALL THE PIPE AND FITTINGS IN BOTH SYSTEMS 70-30 COPPER NICKEL. WHAT DO YOU FOLKS OUT THERE HAVE TO SAY? DON KUMPUNEN QA SPECIALIST SHIP BUILDING US NAVY
 
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2/25/2004 9:00 AM
 
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Don: We cannot think of a rationale for changing piping to 70-30 Cu-Ni and leaving fittings 90-10 Cu-Ni except for cost reasons. Perhaps someone is counting on the extra wall thickness of elbows, etc. for additional corrosion allowance? Hope this helps! David Hendrix The Hendrix Group Inc.
 
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2/26/2004 9:00 AM
 
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THIS ALSO POSES ANOTHER PROBLEM.THE PIPE FITTERS IN THIS SHIP YARD MAKE MISTAKES ON VALVE INSTALLATION, USING THE WRONG PIPE MATERIAL,ETC.PICKING AND CHOOSING WHERE TO USE 70-30 COPPER NICKEL WILL CREATE MORE CONFUSION AND DEFICIENCIES. WILL A 90-10 ELBOW ON THE DISCHARGE SIDE IN A FIRE MAIN SYSTEM BE THICK ENOUGH TO LAST AS LONG AS THE 70-30 CU-NI PIPING? DON KUMPUNEN
 
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