An emergency repair was done to plug a hole in the seal flush line and the equipment was shut down to make the repair. Four days later the work request and work order was created and no attention was given to the actual dates because the process did not demand having these dates. The CMMS/EAM downtime is 0 hours while the historian downtime is 5 hours.
A repair was made on a valve but the valve did not go out of service when the repair was made. However, the technician records on his time sheet when the maintenance started and ended. The CMMS/EAM downtime is 11 months while the historian downtime is 0 months.
A low priority leak was detected and the planner decided to make the repair at the next planned shutdown scheduled for more than a year later. The planner forgot to set the maintenance start date on the work order to the start date of the planned shutdown. The CMMS/EAM downtime is 21 months while the historian downtime is 11 days.
A pipe is leaking in a hard to reach location and scaffolding needs to be built to get to it and install a clamp. Building the scaffolding starts a week before operations has the opportunity to shut down the leaking pipe. The CMMS/EAM downtime is 7 days while the historian downtime is 9 hours.
There is a severe water leak on a pump that needs to be fixed immediately by the on-call crew. A paper work order is written that is entered the next day into the CMMS/EAM system. The clerk entering the work order does not bother to enter the maintenance start and completion dates. The CMMS/EAM downtime is unknown while the historian downtime is 3 hours.