The petroleum refining industries holds the most important part in the modern global economy. The industry is constantly in close contact with raw materials that are distilled through columns and pipes, regulated by valves which control the flow, pressure, etc. The finished product is most likely so important, although their market values are rapidly fluctuating, they are still reported every day on television, radio, Internet, and newspapers. Therefore, they have very valuable assets and have to conduct control valve repair once in certain period to make sure that everything goes well without any rooms for errors which could lead to product failure.
It is important to have the control valves checked once in awhile. Control valve repair is also necessary to be done whenever an error or problem is found. This is to make sure that the refinery will keep the proper performance of products. The process of refining itself has many phases from gathering crude oil and other raw materials before it is processed and ready to be used as our daily needs. There are three major control valve repair and maintenance methods which assures the machine will have uninterruptable performances during the processing phase of raw materials.
The first and the basic method is called the reactive maintenance. This maintenance allows slight errors in control valve repair to go unnoticed and untreated, just because there is no clear indication of a problem. Important control valves could be ignored until there is a severe leakage or failure to function. In certain cases, the production team would give feedbacks to the maintenance dept so that they could take action before the condition develop into something more serious. But if there is a suspicion of malfunction among the valves, they might be removed for further inspection and replacement. This process could end in decreasement of productivity and wasting the time of production.
The second method is the predictive maintenance. Besides conducting the maintenance procedures on a control valve in a routine, the person who is in charge for maintenance should have thorough knowledge of the construction and operation of the valve. Without this knowledge, it could result in damaged equipment or injury on the maintenance personnel. The personnel should pay extra attention to the sectional drawing of equipment which has been provided to help understanding the process of the equipment and identifying the parts. Commonly, among all major types of control valves, the actuator produces force to place a movable valve plug, ball, or disk which is related to a stationary seat ring or sealing surface. The movable part should be responding to changes in actuator force. Failure to take enough measurements before maintaining a valve could result in personal injury or equipment damage.
The last is the preventive maintenance. Generally, this represents a significant improvement. However, because they have been able to obtain information on valves that are operating maintenance schedules, many refineries often conduct maintenance of all control valves simply on a rotating schedule. Such method result in repairing some valves that actually don’t need repairing or adjustments and leaving others in the system long after they have stopped operating efficiently.