Operators are the eyes, ears and manipulators of switches and valves in their plants. They often receive training from a two-year associate degree program or on-the-job training. Their training may or may not cover how their equipment works or the significance of pump performance curves. Effectively training plant operators is crucial for maximizing plant uptime and minimizing maintenance and repair problems. Operators are expected to both identify and troubleshoot problems. They are trained to start, operate and shut down the plant. However, without understanding how the equipment should operate and the basics of a pump curve, troubleshooting will be difficult. Many operators feel that they have little control over the process and are subject to its whims. For example, they know when a pump experiences cavitation, but they may not feel that they have any control of the cavitation. They may identify the problem but feel they have no power to do anything about it. They may not realize that they have some limited control.
With the correct tools and knowledge, these employees can provide solutions for chronic field problems.
10/08/2014
Operators need to understand the operating characteristics of their pumps. (Images courtesy of the authors)
For example, if the pump takes suction from a tank, can the tank level be raised? Can the tank be pressurized? Can the flow be decreased to lower the net positive suction head required (NPSHR)? These are parameters that operators control, and altering them may eliminate the cavitation completely. Remember, if a process removes more from a pump, it must put more into it in the form of higher net positive suction head available (NPSHA).
A fishbone chart is one of many tools for determining the root cause of a problem.