Reducing Risk by Implementing Gas Crossbore Investigations

Risk associated with the increased use of trenchless technology for both new and replacement construction of natural gas distribution systems must be addressed to comply with recently enacted Distribution Integrity Management Program (DIMP) regulations adopted by the USDOT. DIMP regulations require that all gas operators rank system risks and define actions to mitigate these risks. Most gas operators currently utilize trenchless construction methods due to the reduction in construction cost and the minimal impact to surface features. Adoption of a comprehensive crossbore inspection program is critical for utility companies to comply with DIMP regulations. Due to recent incidents nationwide associated with this issue, several major gas distribution companies have instituted inspection programs to mitigate the related risk and insure the safety of their customers. This paper addresses components that should be addressed when either initiating or modifying existing crossbore inspection programs.