Engine 2014: Engineering Safety

1. A slowly operating the bilge pump at half capacity so that it  never completely dewaters the bilges
2. B circulating them through the lube oil purifier to remove water and debris
3. C holding its slops onboard until they can be discharged to a shore side reception facility
4. D pumping them into a settling tank for separation before pumping the oily water residue overboard

Tip: press A-D to answer