Regarding instrument calibration
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I seek guidance: Are the pressure gauges built into the instruments and equipment at natural gas station production sites, as well as the small pressure gauges (0.6 MPa) used for the instrument air in pneumatic valves, and the pressure gauges that display the pressure of the hydraulic oil in hydraulic systems, required to be calibrated? It is very difficult to disassemble, and there are no spare meters available on site as a replacement. What should I do when encountering such problems? Do chromatographs and water dew points need to be calibrated? What about bimetallic thermometers that do not involve process control?
It’s still about classification, based on **measurement standards; some companies require that all samples be sent for testing in accordance with their own corporate standards, anyway the managers don’t need to do it themselves.
You can search on Baidu for the range of pressure gauges subject to mandatory inspection. I’m not sure what the pressure gauge built into your device is used for; the small pressure gauges on pneumatic valves and those in hydraulic systems do not require calibration. If there are no spare gauges, it is necessary to purchase them as soon as possible. Pressure gauges that require calibration must have a calibration certificate attached to them once the calibration is completed, and this certificate should be recorded for keeping.
According to the **measurement standards, inspections should be carried out in a categorized manner; everything required by these standards must be inspected, while items that are less important can be inspected once a year or based on the actual conditions of use and maintenance
Pressure vessels must be inspected
It can be managed separately according to its purpose, but one’s own management system needs to be established； Instruments used in areas such as safety, environmental protection, trade settlement, and healthcare that are included in the **list of instruments subject to mandatory inspection are required to be tested by qualified inspection agencies at regular intervals ； Instruments that are important for things such as process data control and energy consumption can be calibrated. In principle, the calibration interval can be shortened or extended appropriately depending on factors such as the operating environment, but calibration must still be carried out ； As for instruments that merely serve as indicators with low data requirements, they only need to be calibrated once initially; there is no need for periodic calibration. They can be replaced when damaged.
The small air flow meter of the pneumatic valve does not require calibration.
Both the chromatograph and the water dew point need to be checked. The difference between calibration and verification can be found by searching on Baidu. Chromatography definitely requires a calibration gas; a water dew point analyzer cannot be equipped with a calibration gas – it must be sent to a third-party calibration facility or returned to the manufacturer. I specialize in various types of gas analyzers; other instruments also need to be sent for inspection or calibration on a regular basis