In what part of 33CFR can be found the recordkeeping requirements for specific machinery space operations onboard all ships of 400 gross tons or above other than a tanker that must be entered into an Oil Record Book?

Correct Answer: Option B — 33CFR Part 151.25

33 CFR 151.25 explicitly details the requirements for the Oil Record Book (ORB). It mandates that every ship of 400 gross tons or above, other than a tanker, must maintain an ORB to document all machinery space operations involving the handling of oil residues, sludge, and bilge water discharges.