According to the Coast Guard Pollution Prevention Regulations (33 CFR), what is the minimum number of bolts required in a temporarily connected standard ANSI coupling?

Correct Answer: Option D — 4 bolts

33 CFR 156.130 mandates that all bolts must be installed in a flange connection. For a standard ANSI coupling, if the bolt holes are provided, every hole must be utilized. A minimum of four bolts is the regulatory baseline for ensuring a secure, leak-proof connection during cargo transfer operations.