If you're an on-site machinist, you may be expected to work across a variety of industries - often carrying out in-situ jobs such as flange facing, hot tapping or pipe cutting. It goes without saying that the most important thing is to get the job done efficiently and effectively. But if you can demonstrate your knowledge of what goes on at the plant then your credibility can be enhanced - potentially leading to more work in the future.
Oil refining plants create a huge amount of on-site machining work, so having a grasp of the main process involved will put you in a good position. The graphic we've created for you below shows the principle behind a fractionating column used to refine crude oil.