The maximum pressure resistance of the factory gas source pressure gauge varies depending on the application scenario, medium type and industry specifications. The following is a specific analysis:
1. common withstand voltage range
- compressed air system:
- GENERAL STANDARDS: The highest pressure resistance of the compressed air pressure gauge in the factory is usually 1.0~1.6 MPa between.
- Special Scene: Certain high-pressure processes (e. g., oil extraction, airtight testing) may require 10~100 MPa high pressure gauge.
- Inert gas system:
- low Pressure Demand: such as nitrogen, carbon dioxide, pressure gauge pressure range is usually 0~0.1 MPa.
- Industrial Gas Systems:
- oxygen: Pressure gauge pressure range is mostly 0.2~0.4 MPa.
- acetylene: Higher pressure resistance is required, and the range is 0.6~1.2 MPa.
2. industry standards and specifications
petrochemical industry:
according to Code for Design of Instrument Gas Supply in Petrochemical Industry (SH/T 3020-2013), the pressure range of outlet header of gas source device is 600 kPa(G)~1 MPa(G) the pressure at the input of the instrument varies according to the type of equipment. 140 kPa(G)~600 kPa(G) between.
stationary pressure vessel:
according to the Safety and Technical Supervision Regulations for Stationary Pressure Vessels (TSG 21-2016), the limit value of the scale of the pressure gauge dial shall be the working pressure. 1.5~3.0 times.
Key Factors of 3. Selection
- media characteristics:
- corrosive medium: Need to use corrosion-resistant materials (such as stainless steel) pressure gauge.
- high temperature medium: Need to choose high temperature resistant model, avoid spring tube deformation.
- pressure fluctuation:
- stable pressure: The measured value does not exceed the full scale 2/3.
- pulsating pressure: Seismic pressure gauge should be selected and the pressure resistance level should be improved appropriately.
- Accuracy Class:
- general industrial scenario selection 1.5 level or 2.5 level pressure gauge can meet the demand.
- Environmental Adaptability:
- explosion-proof environment: Use explosion-proof pressure gauge.
- Vibration environment: Seismic pressure gauge (such as glycerin filled type) shall be selected.
4. use recommendations
- periodic calibration pressure gauges need to be tested regularly to ensure accuracy and safety.
- Avoid overpressure: Long-term overpressure use may cause permanent deformation of the spring tube, affecting the accuracy of measurement.
- On-demand selection: Select the pressure gauge according to the actual pressure requirements of the equipment to avoid "big horse-drawn cart" or "small horse-drawn cart".
By comprehensively considering the medium type, pressure range, environmental conditions and industry standards, the factory air source pressure gauge can be reasonably selected to meet the requirements to ensure the safe and efficient operation of the equipment.
