OREDA is a reliability database for the oil industry, which has been in use for more than ten years. It contains data from ten different oil companies, and consists of three parts:
Inventory - contains description of equipment units. This includes technical data such as the capacity and size of a unit, operating data such as operating mode. And finally environmental data, such as the climate where the unit is kept.
Failure - contains all failure events reported. A record is stored for each failure. The failure event is related to one or several inventory items. Failures can be discovered during inspection, testing or maintenance.
Maintenance - contains preventive and corrective maintenance carried out. This can be related to inventory if the maintenance is preventive, or to failure, if the maintenance is corrective.
Most features in the database are composed of a number of codes which for instance describe types of failures. Text strings that can give further information are usually provided. There are several missing feature values in the database.