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F-35-70 blowout preventer unit has nominal I.O. of 346.1mm and normal working pressure up to 70Mpa.The unit is composed of Annular Blowout Preventer (NWP 35 Mpa ), single ram blowout preventer , dual-ram preventer and cross joint (NWP70 Mpa ).The unit is designed and built for deep well drilling as well as offshore self-elevating drilling.

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