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Logging Differential Pressures on oil system filters can allow filters to be changed out at convenient shut-downs and also keeps a record of when the filter was last changed (this can be just as important on duplex filter).
In this example, prior to logging in this manner, the seal oil filter cartridge had never been changed-out and collapsed, contaminating the whole seal oil system.
A shutdown resulted because of damage to the mechanical seals caused by the cartridge.
