You look at the PID’s (Piping and Instrumentation Diagram) of the factory. This is a schematic illustration of the process showing exactly how pipes run and how the equipment is connected. You search for a possible cause of the clogging. During the process, for example, a damper could have opened as a result causing resistance and the equipment to drain more slowly.

When you have identified the possible causes, you go to the factory to investigate where it has actually gone wrong. Often you cannot see this on the surface and will need to make an x-ray, or look inside with a camera to find out what has gone wrong. When you and the team have found the solution, you pass it on to maintenance.