Table 1: Pipeline Inspection Prioritization Program Variables for Hazardous Liquid and Gas Transmission Pipelines
Table 1: Pipeline Inspection Prioritization Program Variables for Hazardous Liquid and Gas Transmission Pipelines
| For hazardous liquid pipelines: | For gas transmission pipelines: |
|---|---|
| 1. Number of hazardous liquid pipeline accidents reported per mile of pipeline | 1. Miles of coated, but unprotected, pipeline onshore |
| 2. Number of accidents due to corrosion | 2. Miles of bare unprotected steel pipeline onshore per mile of bare steel pipeline onshore |
| 3. Number of accidents caused by incorrect pipeline operating practices | 3. Miles of bare steel pipeline onshore per mile of steel pipeline onshore |
| 4. Number of accidents due to failed pipe | 4. Number of onshore leaks repaired per mile on onshore pipeline |
| 5. Number of accidents due to failure of field welds | 5. Known leaks scheduled for repair per mile of onshore pipe |
| 6. Number of accidents due to outside forces | 6. Miles of cast iron pipeline |
| 7. Number of failures of longitudinal welds | 7. Miles of "other" pipe |
| 8. Total number of barrels of hazardous liquid spilled | 8. Number of transmission incident reports |
| 9. Total injuries and deaths not caused by outside force | 9. Number of deaths or injuries not caused by third party damage |
| 10. Number of accidents due to corrosion on non-cathodically protected pipe | 10. Incidents due to corrosion per mile of onshore pipeline |
| 11. Incidents due to construction-related defects per mile of onshore pipeline | |
| 12. Number of incidents due to corrosion on onshore pipelines w/o cathodic protection |
SOURCE: U.S. Department of Transportation, Pipeline and Hazardous Materials Safety Administration, http://www.phmsa.dot.gov
NOTE: The difference between accidents (for liquid pipelines) and incidents (for natural gas pipelines) is simply one of terminology. The term “incidents” is often used for both pipeline sectors when a single term is used.