Bureau of Transportation Statistics (BTS)
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Table 4: Significant Variables in the Inherent Risk Models for Gas Transmission and Hazardous Liquid Pipelines

(negative sign indicates a negative correlation with risk)

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Gas transmission model Hazardous liquid model
+ Total Miles + Total Miles
+ Miles offshore + Miles from 26 to <28” diameter
+ Miles from 4 to <10” diameter + Miles pre-1920
+ Miles from 20 to <28” diameter + Offshore >20% SMYS
- Miles from 0 to <4” diameter + Onshore <20% SMYS
- Miles installed 2000-2009 + Regulated gathering lines
  + Total barrel-miles
  + HVL barrel-miles
  - Miles from 8 to <10” diameter
  - Miles from 22 to <24” diameter
  - Miles from 24 to <26” diameter
  - Miles from 30 to <32” diameter
  - Miles >36” diameter
  - Anhydrous ammonia barrel-miles

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, http://www.bts.gov.
Research and Innovative Technology Administration (RITA) • U.S. Department of Transportation (US DOT)
1200 New Jersey Avenue, SE • Washington, DC 20590 • 800-853-1351 • E-mail RITA

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