blind ram

blind ram

[′blīnd ′ram]
(petroleum engineering)
A ram on a blowout preventer that acts as the closing element on an open hole; its ends do not fit around the drill pipe, but seal each other and shut off the space below completely.
References in periodicals archive ?
The RAM type BOP can be of three types- Pipe RAM, Blind RAM, and Shear RAM.
Ram blowout preventer are of four major types: pipe rams, blind rams, shear rams and blind shear rams.