On a bearing using an oiling ring as a means of static oil feed, how often should the bottom of the bearing sump be drained of impurities?

Correct Answer: Option C — Bimonthly

Standard marine maintenance schedules for oil ring bearings typically dictate a bimonthly interval for draining the sump. This frequency is sufficient to prevent the accumulation of sludge and water, which could otherwise compromise the bearing's lubrication film and lead to premature failure of the rotating equipment.