The emergency drainage device is an important device in floating roof tank, used to drain the overloaded water accumulated on the floating roof to ensure a safety for oiltank.
In this paper, the dangerous spaces to be likely neglected in the cleaning or welding job of floating roof oiltank are given, some safety measures to be taken in these jobs are presented.
列出了外浮顶油罐容易被忽视的死角区域，提出了在清洗过程中应采取的安全措施。
3
Measurement errors of inner floating roof tank are commonly concerned problem to operators engaging in oil measurement.