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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

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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.

Updated: Sunday, May 21, 2017