Are there any requirements regarding the diameter of the pressure gauge dial?
Thread Content
In the now-replaced \"Regulations on Safety Technical Inspection of Fixed Pressure Vessels\" (TSG R0004-2009), section 8.4.1 Selection of pressure gauges (1) states that the pressure gauge selected shall be suitable for the medium contained within the pressure vessel； (2) For pressure vessels with a design pressure of less than 1.6 MPa, the accuracy of the pressure gauges used must be at least 2.5 grade; for pressure vessels with a design pressure of 1.6 MPa or more, the accuracy of such pressure gauges must be at least 1.6 grade ； (3) The scale limit value of the pressure gauge dial should be 1.5 to 3.0 times the maximum allowable operating pressure, and the diameter of the dial must not be less than 100 mm. However, according to Article 9.2.1.1 on the selection of pressure gauges in the \"Regulations on Safety Supervision of Fixed Pressure Vessels\" (TSG21-2016), (1) the pressure gauge selected shall be suitable for the medium present within the pressure vessel ； (2) For pressure vessels with a design pressure of less than 1.6 MPa, the accuracy of the pressure gauge used must be at least grade 2.5; for pressure vessels with a design pressure of 1.6 MPa or more, the accuracy of such pressure gauges must be at least grade 16 ； (3) The maximum scale value on the pressure gauge dial should be 1.5 to 3.0 times the operating pressure. The new version does not specify any requirements regarding the dial diameter; are there other documents that outline the dial diameter?
The diameter of pressure gauge dials with an accuracy of 1.6 grade or higher is ≥100 mm
The dial is small, so it’s difficult for the watchmaker to draw enough markings on it. Even if there are enough lines, the dial is small, making it difficult for the person using the watch to identify things visually. . . But the guy who specified what size the dial should be in the standards is simply an idiot! There’s no need to explain why he’s an idiot. :lol
View the specifications for the selection and design of instruments in the petrochemical industry