A service interval refers to the frequency at which the service types are performed. For example, you could create a PM schedule for a piece of equipment that schedules a belt inspection every 5,000 hours and a mandatory belt replacement every 20,000 hours.
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4. ExxonMobil ($394 billion) â the Texas-based oil major is one of the most iconic oil companies, and it is the largest private company by production with 5.3 mb/d. When Exxon acquired Mobil in 1999 â both companies are descendants of John D. Rockefellerâs Standard Oil â it created the largest company on the planet.