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• SCHEDULE 1 • <br />DRILLING BLOWOUT PREVENTION SYSTEMS -CLASS I (ROTARY) <br />FOR WELLS WITHOUT 1st CONTROL STRING SET <br />HYDRAULIC CONTROL SYSTEM <br />BLOWOUT PREVENTION STACK <br />FOR MUD DRILLING <br />ling Valve <br />it 75mm Throuohout <br />To Flare Pit <br />t Extend 30m <br />n Well <br />ead <br />Minimum Nominal <br />100mm Throughout <br />Line To Flare <br />Pit 30m <br />1 Drill <br />ve 4000kPa <br />Nominal SOmm <br />BLOWOUT PREVENTION STACK <br />FOR AIR DRILLING <br />Poge 3 <br />