Variable Bore Ram

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Closing and sealing component in a ram blowout preventer that is capable of sealing on a range of tubular sizes.

Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards

A pipe ram that seals on more than one pipe size.

Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards

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