Mandatory calibration of mass flow meters
Thread Content
Those working measuring instruments listed in the \"Catalogue of Measuring Instruments Subject to Compulsory Verification in the People’s Republic of China\" that are used for trade settlement, safety protection, medical and health care, and environmental monitoring are subject to compulsory verification. I would like to ask whether mass flow meters used in chemical processing plants fall under the category of devices that require mandatory inspection For example, mass flow meters for inflow and outflow at various devices, as well as those in the loading system. If the reading from the loading mass flow meter is used for batch control rather than for final trade settlement (with the scale being used for the final calculation), is it necessary to conduct mandatory calibration? Please, experts, provide an analysis! ! Thank you~~~
Mass flow meters must undergo mandatory calibration for settlement purposes, but calibration is not required if they are used for statistical purposes； During the mandatory calibration of mass flowmeters, all standard tanks are calibrated.
Mass flow meters must undergo mandatory calibration for settlement purposes, but calibration is not required if they are used for statistical purposes； During the mandatory calibration of mass flowmeters, all standard tanks are calibrated.
Measuring instruments that are not used for trade settlement are not subject to mandatory inspection.
Mandatory strict inspection for trade settlements. But it seems that DN300 and above aren’t necessary (I heard this from someone; I’ve never seen pipes of that size).
Regardless of the diameter, any item involved in trade settlements must undergo mandatory inspection; as for the rest, it depends on the efficiency considerations of the respective units. Large factories that are concerned about the quality of product composition will request to have their products inspected on their own.
In principle, foreign trade settlements do indeed require mandatory calibration according to the specified time intervals. However, many large petrochemical companies that operate on a continuous basis have long maintenance cycles, which do not meet the required calibration intervals. In such cases, as long as both parties involved in the trade settlement agree with the accuracy of the flow meter in question and deem it suitable for use in measurements and settlements, they can issue an official document signed and sealed, thereby allowing the calibration interval to be extended! There’s no need to strictly follow the **required inspection cycle!
This requires mandatory calibration, and the determination of whether it is used for trade settlement is not based on the installation location or function of the flow meter. Others cannot determine whether you rely on the scale or the flow meter