Wholistic Integrity Management Approach to Temporarily Convert NG Pipelines into Water Service

Abstract Converting natural gas and emulsion pipelines into water service presents many unique challenges which require a comprehensive integrity plan (IP) to effectively mitigate risk. This methodology outlines the successful implementation of a wholistic, project specific IP to support the temporary conversion of a small diameter natural gas and oil emulsion pipeline system into water service for a six-month period. The implemented IP proved effective in reducing operational risk and pipeline degradation, which is demonstrated in in-line inspection (ILI) results following the conversion. Lessons learned from this project highlight the importance of a proactive and systematic approach to pipeline integrity management when repurposing existing infrastructure for alternate operation. This case study provides a framework for safely completing temporary service changes based on appropriate threat identification for proactive integrity management to effectively minimize risk to both the pipeline and the environment.