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 well was equipped with a blowout preventer, but key parts of that device - blocks of steel known as "blind rams" - did not fully close.
22 inherited "a ticking time bomb." Documents show, for example, that the machine that operated the balky blind rams on the well's blowout preventer "was improperly maintained and in a state of severe disrepair," the lawsuit says.