Distance between center tank stringer scallop &drain hole is 60mm. Scallop to be covered by WT lug. Refer to IACS table 7.3&9.3, other ways in table 9.3 are OK.

• 油轮中舱平台过焊孔和旁边的流水孔相距60，过焊孔用水密补板封死。参考IACS表7.；3和9