IMC-2008 23rd International Maintenance Conference - Dec 8-11 - Hyatt Coconut Point Bonita Springs Florida Join or Manage Your Profile Posting Boards Maintenance and Reliability Root Cause Analysis Failure of Under ground CLosed drain Pipeline
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Dear Members,
Recently we had a failure in under ground closed drain line. There was a hole as shown in the photo (looks like perfectly drilled hole). It is from external source. There are some grooving in the pipe at isolated locations. The soil is wet and near by sea. No CP is provided. The material is carbon steel. Your comments? Jayapal  IMG_2459.jpg (590 Kb, 42 downloads) Closed Line Failure |
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Looks like corrosion from a rock or similiar item laying up against it. Rust finally penetrated the thickness of pipe.
Dave |
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Jayapal,
Can you please measure the potential of the pipe with respect to the surrounding soil? Even where there is no CP, stray currents picked up from elsewhere can exit at preferred locations, usually wet soil. Regards, V.Narayan (Vee) Lead Author, 100 Years of Maintenance: Practical Lessons from Three Lifetimes, Industrial Press.NY ISBN-13: 978-0831133238 Author, Effective Maintenance Management: Risk and Reliability Strategies for Optimizing Performance, 2004, Industrial Press NY ISBN-13: 978-0831131784 |
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Provide wrapping-coating throughout the length of the pipe. This is a standard practice being followed for underground piping to avoid its corrosion . Normally anodic structures corrode in this way. |
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Akhtar,
I am afraid I disagree with you. It is important to know why the problem has occurred before proposing a solution. We must gather supporting evidence first, prove our theory about the failure mechanism and only then can we think of solutions. Regards, V.Narayan (Vee) Lead Author, 100 Years of Maintenance: Practical Lessons from Three Lifetimes, Industrial Press.NY ISBN-13: 978-0831133238 Author, Effective Maintenance Management: Risk and Reliability Strategies for Optimizing Performance, 2004, Industrial Press NY ISBN-13: 978-0831131784 |
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Vee, what I said may be a probable reason and certainly not a conclusion. I think, you will not disagree that corrosion is one of the prominent reasons for undeground pipelines failure. One more aspect, I have seen at least 10 failures of buried piping in a period of 2 years. The problem was that the pipeline was not seamless and the lines had been laid out such that the seam welding was around 6 O' clock position resulting in deposition of sludge along the welding thereby further aggravating the corrosion. This is yet another possibility. |
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Akhtar,
You are absolutely right. External corrosion is indeed a very common reason for pipeline failure. But it is not the ONLY cause of such failures. These include, e.g., internal corrosion, erosion, weld cracks, impressed current or stray current exits. My point is that we need to know what exactly caused this particular problem, and apply a solution that matches the specific failure mechanism that applies in this case. For example, if stray currents caused the failure, external wrapping if applied has to be 100% holiday-free for the forseeable future. That stray current will exit at the first 'holiday' and cause a hole in the new location. Such a situation can occur a few days, weeks, months or years after the initial installation. I hope I am making myself clear. Regards, V.Narayan (Vee) Lead Author, 100 Years of Maintenance: Practical Lessons from Three Lifetimes, Industrial Press.NY ISBN-13: 978-0831133238 Author, Effective Maintenance Management: Risk and Reliability Strategies for Optimizing Performance, 2004, Industrial Press NY ISBN-13: 978-0831131784 |
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IMC-2008 23rd International Maintenance Conference - Dec 8-11 - Hyatt Coconut Point Bonita Springs Florida Join or Manage Your Profile Posting Boards Maintenance and Reliability Root Cause Analysis Failure of Under ground CLosed drain Pipeline
Join or Manage Your Profile Posting Boards Maintenance and Reliability Root Cause Analysis Failure of Under ground CLosed drain Pipeline
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