Engine: Engineering Safety

1. A pumping them into a settling tank for separation before pumping the oily-water residue overboard
2. B holding its slops onboard until they can be discharged to a shore side reception facility
3. C circulating them through the lube oil purifier to remove water and debris
4. D holding its slops onboard until they can be pumped into the city sewer system

Tip: press A-D to answer