Problems with pressure gauge testing

According to the \"Guidelines for Mandatory Calibration\" published by the State Bureau of Technical Supervision of the People’s Republic of China, safety pressure gauges used in the following equipment are subject to mandatory calibration: 1. Pressure measurement in the main gas tanks and water supply systems of boilers; 2. Pressure measurement in the air reservoirs and main pipes of fixed air compressors; 3. Oil pressure measurement in steam turbines and generators; 4. Pressure measurement with alarm functions; 5. Pressure measurement in sealed, pressurized containers; 6. Pressure measurement of media that are toxic, harmful, or highly corrosive. Other pressure gauges are considered non-mandatory for calibration. For items subject to mandatory inspection, inspections are carried out every six months; for those not subject to mandatory inspection, inspections are conducted once a year. Now, **although the inspection of pressure gauges has been made free, the time frame for such inspections is too long. Reducing the number of mandatory inspections was done to save effort, but now that many companies set up their own measurement laboratories, these problems are gradually decreasing. It should be clear that when a company sets up its own metrology laboratory, it does not create its own standards.

I don’t quite understand. For pressure gauges whose testing standards are established by the companies themselves, as I’ve encountered before, there should be a master table with reference parameters, right? That master table must be sent for inspection compulsorily.

Meters subject to mandatory inspection refer to those used in the areas of safety protection, medical and health care, environmental monitoring, and trade settlement, and are listed in the \"Catalogue of Meters Subject to Mandatory Inspection in the People’s Republic of China\". Pressure gauges that meet these two requirements fall under the category of meters subject to mandatory inspection; otherwise, they are not subject to such inspection. After establishing measurement standards, enterprises can carry out the verification or calibration of measuring instruments that are not subject to mandatory inspection. For measuring instruments that are required to be inspected mandatorily, such verification can also be carried out upon authorization from the technical supervision authorities; however, all these activities are intended for internal use only and cannot be conducted on an external scale.

To determine whether a meter is a meter subject to mandatory inspection, it must first be classified. For mandatory inspection, the inspection is now **free of charge; companies do not need to pay anything. For something that’s free, **why pay money for it? It’s like pulling a tooth out of one’s own hand – surely companies can’t just decide that certain instruments fall under the category of those requiring mandatory inspection, right?** , I guess **some evaluation agency will conduct a qualitative assessment, right?**

I agree with love861204; I didn’t realize before that pressure gauges were required to undergo mandatory inspections. Now we have to send them to a specialized inspection agency for testing every six months, which is really very troublesome

This post was last edited by ssln123 on 2019-10-16 08:31. How much does the entire process of setting up markers cost approximately? Has anyone done it?

1. For the mandatory inspection of pressure gauges, they need to be sent to a \"qualified\" institution for testing; after meeting the relevant standards, one’s own organization also becomes a \"qualified\" institution, so it is certainly possible to conduct the testing oneself； 2. With constraints such as toxicity, flammability, pressure (for containers, pipelines, equipment), and trade measurement, few pressure gauges available to a single unit can escape strict inspection.

So the test still needs to be done: lol