当钻井下沉时，海底立管在顶部附近破裂，另一端还连在防喷阀上。 在随后的倒塌中，它像脆饼一样弯曲。
When the rig sank, the riser broke near the top while remaining attached to the blowout preventer at the bottom, bending itself like a pretzel in its subsequent collapse.
拆卸阀罩顶部的两个螺丝，然后拆卸阀罩。
阀门的优点：用金属横膈膜代替人造橡胶衬垫在阀门和阀杆的顶部机件处给予了这种阀门出众的泄漏完整性。
Valve Advantages: The replacement of elastomeric packings by metal diaphragms gives this valve superior leak integrity at the top works of the valve and stem.
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