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They close the<br />
annular space outside<br />
the string of pipe in a<br />
well or open hole, by<br />
moving rams from a<br />
retracted position<br />
clear of the bore into<br />
a position where they<br />
close around the<br />
pipe.<br />
Rams operate in pairs<br />
and seal space below<br />
them closed.<br />
Ram-type<br />
preventers