Ch 6- Tank cleaning (c)

Question 1

What does COW stand for?

Answer 1

Crude Oil Washing

Question 2

What is Crude Oil Washing?

Answer 2

A system whereby oil tanks on a tanker are cleaned out between voyages with crude oil

Question 3

What size ships must be fitted with COW cleaning systems (according to MARPOL Annex 1)?

Answer 3

20,000 tons DWT and above

Question 4

When does Crude Oil Washing occur?

Answer 4

During loaded voyage/ Discharge

Question 5

When must each tank receive COW (according to MARPOL Annex 1)?

Answer 5

Every 4 months

Question 6

What are advantages of Crude Oil Washing (5)?

Answer 6

1. Commercial (better outrun)
2. Commercial (prevents contamination)
3. Operational (for gas freeing)
4. Maintenance(less clinging)
5. Prevention of pollution

Question 7

What does MARPOL stand for?

Answer 7

International Convention for the Prevention of Pollution from Ships

Question 8

Procedures and precautions for Crude Oil Washing (7)

Answer 8

1. Planning (Cargo and COW sequence)
2. Discharge rate (inform terminal before/during/after)
3. Manpower (trained)
4. O2 (% or less)
5. Fire safety precautions
6. Regular rounds
7. Follow procedures given in the ship’s Operations and Equipment Manual