According to 33 CFR's, an oceangoing ship of over 400 gross tons must be fitted with a standard discharge shore connection. What size bolt circle diameter is required for this shore connection to transfer oily ballast to a shore side reception facility?

Correct Answer: Option B — 183 mm

33 CFR 155.430 mandates that vessels over 400 gross tons must be equipped with a standard discharge connection to facilitate the transfer of oily bilge water to shore reception facilities. The required bolt circle diameter for this flange is 183 mm, ensuring compatibility with international port equipment.