Valve failure in the instrument air piping network
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What should be done on-site and at the control room when a valve in the instrument air pipeline network fails?
It depends on the type of operation for your control valve – whether it is air-operated shut or air-operated open
If the instrument air valve is fully open, the impact is likely to be minimal, as there is still an air supply to ensure its operation. However, if all valves are closed, things will become more complicated both on-site and at the control panel. On-site, it is necessary to verify the actual status of each valve; generally, important valves come equipped with pressure retention systems that ensure their position remains unchanged for a certain period of time even in the absence of wind, thus providing assurance for their reuse later. At the control panel, it is necessary to check the various process parameters of the equipment as well as its operating condition.
What is needed is to wait, to wait for the pipeline network to be repaired. Faults in the instrument air supply were taken into account during the engineering design, as well as whether the valves should open in case of an accident, close in such a situation, or maintain their current position. There are also emergency plans in place, prepared according to the requirements of the manufacturing process.
Check whether the valve is direct-acting or reverse-acting