减震
Remove peak loads in crane and rigging.
Operational Challenges
Dynamic load on crane or load at lift-off for lifts in air.
Limited operational weather window because of harsh weather conditions.
Any operation where peak loads may arise, in air and subsea.
Potential re-entry of load being lifted represents a significant risk.
Cranemaster Benefits
Increasing the operational weather window of the lifting operation.
Protection of crane and lifted structure in all lifting phases by reducing the dynamic amplification factor (DAF).
Immediate response to potential dangerous loads.
Enabling crane to maintain its lifting capacity at increased wave height.
Cranemaster® protects the crane and the lifted structure by reducing the dynamic amplification factor (DAF) in all lifting phases.
Offloading from a supply vessel or barge with and without Cranemaster®
Manifold weight: 50T • Significant wave height (Hs): 2.0m • Wave period (Tz): 8sec. • Hoisting speed: 0.3 m/s.
This Orcaflex simulation shows a lift-off situation from a barge. The crane is sitting on a fixed platform, but the principles are the same also if the crane is mounted on a moving vessel.
Without Cranemaster® (to the left):
Significant snap load during lift-off, in this case around 85T. This corresponds to a DAF of 1.7.
With Cranemaster® (to the right):
Snap load is avoided and the DAF is reduced to around 1.1.
For cranes with a slow lifting speed, there may be a risk of re-contact between the structure and the barge. Some Cranemaster® units can be equipped with a quick-lift system which will pull in the piston and thereby avoiding the re-contact.
Shock absorption since 1983
The first applications of Cranemaster® units back in the early 1980s were related to shock absorption and since then small units with SWL of a few ton up to large units with SWL of 500 ton have been developed.
Please contact us for discussions of specially designed Cranemaster® units used for shock absorption.
MOB boats, lifeboats and NORSOK R-002
Over the years Cranemaster has delivered a number of different units for deployment/retrieval of MOB, work boats, and lifeboats. In the NORSOK R-002, edition 2. issued in September 2012 there are strict rules for shock absorption during lifting of MOB boats and lifeboats.
Cranemaster® is an excellent solution to these requirements, and is well suited in cases where the use of elastic pennant is impractical or does not give sufficient dampening.
Featured References – 减震
平台模块的转移升降机
客户挑战： 将平台结构物从驳船提升到平台上。 Cranemaster 解决方案： 两个 Cranemaster® 装置串联，SWL 为 400 公吨，伸缩量为 4.3 米。 使用了 Cranemaster® Quick Lift 功能避免提升后再次接触。
新西兰残骸拆卸操作
客户挑战： MV Rena 在丰盛湾的 Otaiti (Astrolabe Reef) 触礁后，此事故成为新西兰最严重的海上环境灾难之一。 清理过程不但困难而且有风险。 Cranemaster 解决方案： Cranemaster 在清理残骸之前协助进行了计算和起重模拟。 实际操作时，在切割和起吊残骸住宿区的上半部分时使用了两个 Cranemaster® 被动型海浪补偿器（SWL 400 吨）对船只移动进行补偿。 操作期间 Cranemaster 还为服务技术人员提供了协助。 详情： 关于 Rena 沉船清理工作的更多信息请见 www.renaproject.co.nz。 [...]
STL 浮标系统定制减震器
客户挑战： 将装载浮标提升到船舶停靠舱时，起重装置会因船舶运动产生峰值负载。 Cranemaster 解决方案： 为缓解和避免 过量负载，Cranemaster 设计了一个特殊装置，可作为过载保护装置永久性地安装在装载浮标的顶部。 负载超过预设压力时，Cranemaster® 减震器会随之伸缩。 这保证了装载浮标实现平稳且安全的停靠。 详情： 这些装置 现已经运行多年，执行了认证机构要求的检查和检修。 Cranemaster® 减震器 安装在 Vincent 和 Reliance 油田的 APL 装载浮标上。