Safety is always the number one focus of the pipeline industry. This paper will discuss how Double Block & Bleed (DB&B) maximizes safety during a pipeline isolation. In addition to safety, DB&B also maximizes project efficiency, which results in minimizing project and maintenance costs.

The goal of DB&B for both safety and efficiency is to approach 100 percent success in achieving a seal with no detectable seepage.

Pipeline isolations are frequently utilized for maintenance such as replacement of leaking block valves, cut out and repair of third party damage, and cut out and replacement of imperfections identified during inline inspection runs.

This paper will begin with a review of laboratory testing and calculation of DB&B efficiency, followed by one or more field case studies.

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