Which phase of operations does IG operations usually take place?

Inert Gas (IG) operations are typically associated with discharging activities. During this phase, the tanks need to be kept inerted to prevent the formation of flammable vapors and to minimize the risk of combustion, ensuring the safety of the crew and the vessel. As cargo is being discharged, the remaining vapor space in the tank must be filled with inert gas to maintain a safe environment. This practice is crucial to mitigate fire and explosion risks by preventing atmospheric contamination.

While loading activities also involve specific safety measures, the primary focus for IG operations is on maintaining a safe cargo tank environment during discharging, where there's a higher potential for vapors to be released as the cargo level within the tank decreases. The other choices involve conditions that may not necessitate the same level of inerting as discharge operations, particularly after tank inspections or prior to maintenance, when the focus is more on ensuring tank integrity rather than controlling vapors.