Tambs Erling,Langenes Harald,Bergan Håkon F.,Kaasin Bård H.
申请号：
US201414304728
公开号：
US9567814(B2)
申请日:
2014.06.13
申请国别(地区):
美国
年份:
2017
代理人:
Eubanks PLLC
摘要：
Various hoisting systems with heave compensation are provided. In one embodiment, an apparatus includes a hoisting system having a crown block and a drawworks. The drawworks includes a rotatable drum for reeling in and reeling out a hoisting line that is wound on the rotatable drum and reeved over the crown block. The hoisting system includes active heave control at the drawworks and a passive heave compensation system. Additional systems, devices, and methods are also disclosed.
