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It is also possible<br />
(available), to use<br />
rams that can be<br />
closed around<br />
different drill pipe<br />
diameters: from 88,9<br />
mm (3 ½˝) to 127,0<br />
mm (5");<br />
That is just to avoid<br />
the necessity to change<br />
the rams in preventer,<br />
when the drill pipe<br />
diameter is changed.
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