Selection of orifice plate flowmeters and provision of process conditions
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I would like to ask all colleagues in the industry: in actual operation, there is usually some deviation between the actual performance and the design specifications. Assuming that the orifice plate flow meters in use remain unchanged, what is the acceptable range for such flow rate deviations according to the design standards? My supervisor said it should be between 70% and 105%. Could you please tell me which document or standard specifies this?
What is the allowable range for flow deviation? It seems that this concept does not exist in flow meters. The normal flow rate should be between 60% and 80% of the full scale, while the minimum and maximum flow rates within the process should be between 10% and 90%.
Do you mean that the normal flow rate is within the range of the gauge? It is specified in the \"HG_T20507-2014 Specifications for the Design and Selection of Automated Instruments\".
Regarding what you mentioned, I have seen the relevant specifications; as mentioned earlier, HGT 20507 specifies the normal operating range for differential pressure flow. However, my supervisor told me that it depends on the conditions provided by the process, and I haven’t found any instrument specification that describes this in such terms.
Generally, the reliability of orifice plate flowmeters is low below 30%