OS Environmental Standards 5

Question 1

Ballast water exchange by the sequential method must replace at least what percentage of the ballast water by volume?

Accepted Answer

95%

Answer

The D-1 standard requires at least 95% volumetric exchange.

Question 2

When ballast is exchanged by the flow-through (pumping-through) method, how many times the tank volume must be pumped through?

Accepted Answer

Three times

Answer

Pumping through three times the tank volume is treated as meeting the 95% exchange standard.

Question 3

Which of these is in a MARPOL special area, where garbage and oil discharge rules are stricter?

Accepted Answer

Mediterranean Sea

Answer

The Mediterranean is a MARPOL special area, as are the Baltic, Black Sea, Red Sea, Gulfs area and Wider Caribbean.

Question 4

Under the revised MARPOL Annex V, what is the rule for discharging dunnage, lining and packing materials that float?

Accepted Answer

Prohibited at sea

Answer

Since 2013, Annex V has prohibited discharge of all garbage, including dunnage, except a few listed exceptions such as food waste.

Question 5

Which MARPOL annex regulates noxious liquid substances carried in bulk, such as chemicals in chemical tankers?

Accepted Answer

Annex II

Answer

Annex II covers the control of pollution by noxious liquid substances carried in bulk.

OS - Ordinary Seaman Exam Practice Test