Blowout Preventers - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/blowout-preventers
WEBJul 3, 2012 · The BOP stack is the assembly of drilling-control equipment connected to the top of the casing head. The basic items of the BOP stack are blind ram preventer, pipe ram preventer, annular preventer, drilling spool, kill line, choke flowline, bell nipple, and fill line. Fig. 2.17 shows a typical BOP stack arrangement with basic equipment.
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