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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Pinhole leaks on stainless domestic water supplyPinhole leaks on stainless domestic water supply
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7/21/2004 9:00 AM
 
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I have a problem with pinhole leaks on a 6 inch domestic water supply line. The piping is welded stainless, the holes are developing on the upstream side of the weld, about 3/4 of an inch from the weld. The piping has only been in use for about 18 months. The water supply going through the line is softened city water (nothing else). Any assistance will be appreciated. Can you provide some direction?
 
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7/24/2004 9:00 AM
 
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Mike: Tough to say with your limited description of the water chemistry. However, you should investigate the usual suspects, i.e., deposits, chlorides, residual chloride and SRB's. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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7/25/2004 9:00 AM
 
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Thank you for the info. I will get you an update on our findings.
 
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9/3/2004 9:00 AM
 
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Sounds like the pipe may not have been passivated. The heat affected zone right next to the weld is the weakest part of the pipe and most prone to corrosion. If there was not passivation after welding you could see the kind of result you describe. Any corrosion that occurs in that zone can quickly accelerate into a pinhole.
 
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