Several issues regarding the red line on pressure gauges
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In what operating conditions must pressure gauges have a red upper limit indicator? Does every pressure gauge need to have an upper limit mark, and do pressure gauges on pressure regulators and reducers also need such marks?
From a safety management perspective, wherever there are requirements regarding operating within specific pressure ranges, it is recommended to install upper and lower limit markers to enable on-site personnel to detect and address any abnormalities promptly； If conditions permit, it is advisable to use remote automatic control and alarm systems for pressure monitoring as well.
Generally, there are upper and lower limits
Theoretically, the range of a pressure gauge should be its upper and lower limits; yet now there are red markers indicating these limits, and such markers have become almost mandatory. Does anyone know why? Please share your opinions.
It’s not that complicated; we usually mark a red line on pressure gauges that are subject to strict inspection, and red lines are used on those pressure gauges whose process parameters are important
This question isn’t meaningful; it’s just a reference marker. The safety supervision department simply demands that it be implemented; you have no control over that.
The range of the pressure gauge should be adjusted at any time according to the changed operating conditions; theoretically, it should be set between 1/3 and 2/3 of the maximum value. The upper and lower limits serve merely as a means to prevent overload or for visual management purposes.
On boilers, pressure vessels, and pressure pipelines, a red line indicating the maximum allowable working pressure must be marked for warning purposes.