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Defining Double Block and Bleed

By Greg Peterson, Executive Director - Midstream/Upstream Valves & Automation, MRC Global
April 11, 2017 Tags: Valves, Double Block and Bleed, DBB, DIB, Double Isolation and Bleed

A common question we hear from many of MRC Global’s customers concerns the definition of a double block-and-bleed valve. There is confusion because there are many interpretations of the term double block-and-bleed (DBB) when describing valve functionality. It seems that almost every end user and manufacturer has a different idea of what the term means for valve selection, which can result in the wrong specifications or valve type.

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