Maximum process pressure of vortex flow meter
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I would like to ask everyone: On Emerson’s vortex flowmeter labels, it is indicated that \"the maximum process pressure at 38°C is 10.34 Mpa\". Why is 38°C specified? Thank you!
Is the maximum pressure at 38°C 10.34 MPa?
The maximum operating pressure of the instrument is related to temperature; as the temperature rises, the maximum operating pressure decreases. This marking indicates a maximum pressure of 10.34 MPa at 38°C.
The allowable stress of metals changes with temperature; generally, as the temperature rises, the allowable stress decreases. For the corresponding gauge chamber, the manufacturer provides a reference value at 38 degrees; the higher the temperature of the working fluid or the environment, the lower the pressure resistance.
Thank you all for your answers! Why is it necessary to specify the voltage tolerance at 38°C?
During testing in the factory, it was exposed to an environment of 38°C and a pressure of 10.34 MPa; it worked fine. But when more pressure was applied, it broke.
The load-bearing capacity of metals is related to temperature; as the temperature rises, their rated load-bearing capacity decreases. This marking indicates the maximum load-bearing capacity at 38 degrees
Most instruments or valves abroad will indicate the pressure value at the corresponding temperature on the equipment’s nameplate, which represents the range of application. When selecting flanges, we also take into account the maximum allowable operating pressure at the corresponding highest or lowest temperatures; exceeding this value can affect the proper functioning of the flange. You can read the corresponding content in HG/T20592-615/2009.
“\"Maximum process pressure at 38°C: 10.34 Mpa\" means a pressure resistance of 10.34 MPa at 38°C. It can be understood that at room temperature, PN=100 (or PN=10 MPa); generally, as the temperature increases by one level, the allowable pressure decreases by one level ； Depending on the different temperature grades of the material, they are generally classified into normal temperature, ≤120°C, ≤260°C, ≤420°C, and ≤650°C. (This data is merely an empirical classification for materials that require inspection.)