Assertion: drilling riser | /r/ObjectUse | used by floating drilling vessels
Facets:
value: generally
type: MANNER
Source sentences:
text: Drilling risers are categorised into two types: marine drilling risers used with subsea blowout preventer (BOP) and generally used by floating drilling vessels; and tie-back drilling risers used with a surface BOP and generally deployed from fixed platforms or very stable floating platforms like a spar or tension leg platform (TLP).