boom derrick crane 支臂桅杆起重机
derrick boom 起货吊杆 ; 吊杆 ; 起重杆 ; 吊货杆
derrick boom rest 吊杆托架
light derrick boom 轻型吊杆
slewing angle of derrick boom 吊杆最大偏角
inboard derrick boom 舱口吊杆
two derrick boom cargo handling 联杆吊货法
derrick boom for dipper [机] 铲斗吊杆
The derrick boom rests to be renewed as Chief Officer requirement because the rests are too high and too thin and not safety for navigation. Also the deformed positions to be corrected.
吊杆支座应按大副要求换新，因为支座太高、太薄不能满足安全航行，同时需纠正变形。
The opening hatch cover method also not to be satisfied that using the warping head of cargo gear not through derrick boom open the hatch cover because using derrick boom is not safe.
开舱盖的方法不令人满意，起货设备传动轮弯头在开舱时不穿过吊杆，原因为使用吊杆不安全。
Chief Officer: The derrick boom on hatch No. 1 is not safe, and it may be harmful for navigation. Second, could you check it tomorrow?
大副： 1舱吊杆不安全，可能影响安全航行，二副，你明天检查一下。
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