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| NO. | Causes | Sub-causes |
|
| 1 | Corrosion | |
| External Corrosion | Galvanic Corrosion, Stray Corrosion, Microbiological Corrosion, Selective Seam Corrosion, … |
| Internal Corrosion | Corrosive Commodity, Acid Water, Microbiological Corrosion, Erosion, … |
|
| 2 | Pipe/Weld Material Failure | |
| Construction, Installation or Fabrication Related | Weld Quality, Mechanical Damage in the Field, … |
| Original Manufacturing Related | Weld Quality, Manufacturing Defect, … |
| Environmental Related | Stress Corrosion Cracking, Deformation Related Cracking, … |
|
| 3 | Excavation Damage | |
| Operator’s Contractor (Second Party) | Excavation Practices not Sufficient, Locating Practices not Sufficient, Previous Damage, … |
| Third Party | Excavation Practices not Sufficient, Locating Practices not Sufficient, One-call Notification Practices not Sufficient, One-call Notification Center Error, … |
| Previous Damage due to Excavation Activity | One-call Notification Practices not Sufficient, Previous Damage, … |
|
| 4 | Natural Force Damage | Earth Movement, Heavy Rains/Floods, Lighting, Temperature, … |
|
| 5 | Incorrect Operation | Damage by Operator or Operator’s Contractor, Pipeline or Equipment Overpressure, Equipment not Installed Properly, … |
|
| 6 | Other Outside Force Damage | Damage by Cars, Boats, Nearby Industry or Fire/Explosion, … |
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