Table 4: Significant Variables in the Inherent Risk Models for Gas Transmission and Hazardous Liquid Pipelines
Table 4: Significant Variables in the Inherent Risk Models for Gas Transmission and Hazardous Liquid Pipelines
(negative sign indicates a negative correlation with risk)
| 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.