【2025 Specification Requirements】Specifications for the installation and use of on-site pressure gauges
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This post was last edited by The one on 2025-12-29 09:48. Pressure gauges serve as the \"eyes\" for the operation of chemical pipelines and equipment; improper installation or selection not only affects production but also poses risks of safety accidents such as overpressure, vacuum conditions, and pressure fluctuations. Therefore, the proper installation, selection, and use of pressure gauges are key to establishing a solid safety barrier.
According to Article 6.1.1 of GB 50093-2013 \"Code for Construction and Quality Acceptance of Automatic Instrumentation Projects\", the installation location of pressure gauges should have sufficient lighting to facilitate operation and maintenance； The display instrument should be installed in a location where the readings can be easily observed ； Meters should not be installed in locations subject to vibration, humidity, mechanical damage, strong electromagnetic interference, high temperatures, extreme temperature fluctuations, or corrosive gases.
According to Article 7.5.1 of SH/T 3551-2024 \"Code for Construction and Acceptance of Petrochemical Instrumentation Projects\", the installation location of pressure tapping components should be in a straight pipe section where the flow of the medium is stable; it should not be placed at points where the pipeline bends or where the flow forms vortices.
According to Article 7.5.4 of SH/T 3551-2024 \"Specifications for the Construction and Acceptance of Petrochemical Instrumentation Projects\", the installation location of the pressure gauge transducer on horizontal or inclined pipelines should be in the upper half of the pipeline when measuring gases； When measuring liquids, it should be done at an angle of 0°–45° below the horizontal centerline of the pipeline.
According to Article 7.5.5 of SH/T 3551-2024 \"Code for Construction and Acceptance of Petrochemical Instrumentation Projects\", pressure gauges should be placed near the pressure sampling point. When the temperature of the medium is above 60°C, it is necessary to extend the measurement pipeline or install cooling devices between the pressure gauge and the shut-off valve, such as condensation elbows or condensation coils.
According to Article 7.5.7 of SH/T 3551-2024 \"Code for Construction and Acceptance of Petrochemical Instrumentation Projects\", when the pressure of the medium being measured by the pressure gauge fluctuates greatly, buffer measures should be taken for such gauges.
According to Clause 6.2.2 A of SH/T 3005-2016 \"Specifications for the Selection and Design of Automation Instruments in the Petrochemical Industry\", special pressure gauges shall be used for measuring acetylene, ammonia, and media containing ammonia.
According to Article 6.1.3 of SH/T 3005-2016 \"Specifications for the Selection and Design of Automation Instruments in the Petrochemical Industry\", the principle for selecting the range of a pressure gauge is that, when measuring a steady pressure, the normal operating pressure should be between 1/3 and 2/3 of the gauge’s range.
According to Article 9.2.1.2 of TSG21-2016 \"Regulations on Safety Technical Inspection of Fixed Pressure Vessels\", the calibration and maintenance of pressure gauges shall comply with the relevant regulations of the metrology authorities. Pressure gauges must be calibrated before installation, and a red line indicating the operating pressure shall be marked on the dial, along with the date for the next calibration. A pressure gauge should be sealed with a lead seal after calibration.
According to Article 6.3.1.2 of GB 17681-2024 \"Technical Specifications for Safety Monitoring of Major Hazard Sources of Hazardous Chemicals\", the installation location of the pressure gauge should ensure that it can measure the gas phase pressure at the highest liquid level, and should also facilitate observation and maintenance.
According to Article 9.2.1.3(2) of TSG21-2016 \"Regulations on Safety Technical Inspection of Fixed Pressure Vessels\", a tee stopcock or needle valve shall be installed between the pressure gauge and the pressure vessel, and no fittings or connections for other purposes shall be attached.