It is recommended that every valve be cycled fully open and closed on an annual basis - and even more frequently, if possible. Prioritize work by selecting the valves that are crucial to the system’s operation and work toward the lower impact packages. Consider regular inspection and exercising all the valves in the system. Regular and consistent execution of a preventive maintenance program should be ensured.
Review and understand the valve manufacturers’ operation and maintenance procedures for various valve types. Start by evaluating the complete distribution system and identify each valve within the process. When properly implemented, the following recommendations can improve system reliability and performance. The benefits can increase productivity and reduce downtime Putting Planned Valve Maintenance to WorkĪ common question asked by valve users is: How often should a valve be cycled? Let’s address this concern and offer an outline for a planned-maintenance program. The system maintenance plan must be immediately upgraded to include a valve repair or replacement - and whatever prompted the valve operation must be dealt with as well.Ĭonsider implementing a valve-exercise program into your facility. This is not the time to discover you have a valve that will not operate. When the system requires maintenance, or an emergency occurs that requires a change in valve position, however, it is often then that inoperable valves are discovered. With the system in continual operation, it is understandable that operators and maintenance teams do not want to include cycling testing valves as part of periodic maintenance. This time can extend from months to - in some cases - years. As a result, many valves remain in either the open or closed position for prolonged periods. Oftentimes, the plant has no intention of cycling a valve, or system restrictions prevent the valve from being operated for extended periods. Chemical treatments, line sediment, particle shedding, corrosion, instrument air quality and unsatisfactory electrical connections are just a few issues that can affect a valve and, therefore, the system performance.
Many factors can affect a valve’s safe operation, and one of the major causes is lack of proper maintenance. When a situation arises that requires an operator to isolate a valve, users report that, on average, 20 percent of all valves are deemed inoperable, or reported as needing some form of maintenance. An inoperable valve can affect the performance of the entire system for which it is designed. Without proper periodic cycle testing, there is a probability that when the operator needs the valve to perform, it may fail.
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