Prepare for safety before calibration

Equipment status inspection: Before calibration, it is necessary to confirm whether the calibrated pressure gauge and standard (such as piston pressure gauge, digital pressure gauge) are within the valid calibration period, and whether there is any damage to the appearance (such as dial rupture, interface deformation), in order to avoid measurement errors or accidents caused by the use of unqualified equipment. At the same time, check whether the connecting pipelines and valves are aged or cracked, and whether the sealing gaskets are intact to prevent medium leakage during pressurization.

Medium safety control: If liquid (such as silicone oil, water) is used as the pressure transmission medium, it is necessary to ensure that the medium is clean, non corrosive, and avoid damaging the internal components of the pressure gauge; If gas (such as nitrogen, compressed air) is used, it is necessary to confirm that the gas source is free of oil and moisture, and that the gas is non flammable and non-toxic. It is strictly prohibited to use flammable and explosive gases such as oxygen and acetylene directly as pressure transmission media to prevent explosions.

Environmental safety confirmation: The calibration site should be well ventilated and kept away from sources of fire, heat, and flammable and explosive materials. If calibrating a high-pressure gauge (such as exceeding 10MPa), it needs to be done on a dedicated pressure resistant workbench, with safety warning signs set up around it, and unrelated personnel are not allowed to approach.

Strictly standardize the calibration operation process

Pressurization and depressurization should be stable: slowly adjust the pressure source (such as hand cranked pumps, electric pressure pumps) to avoid pressure shock caused by rapid pressurization, which may damage the internal spring tube, pointer, and other components of the pressure gauge. At the same time, prevent the medium from splashing and injuring people due to impact. When reducing pressure, it is also necessary to operate slowly and avoid sudden pressure relief to prevent the pressure gauge pointer from jumping violently and affecting accuracy or causing equipment damage.

Prevent over range calibration: Before calibration, clarify the range of the calibrated pressure gauge, closely observe the pressure value during the pressurization process, and strictly prohibit exceeding its maximum range, otherwise it may cause permanent damage to the pressure gauge, and even dangerous situations such as spring tube rupture and medium ejection.

Avoid operating connecting components under pressure: When installing or removing pressure gauges or replacing connecting pipelines, all pressure in the system must be removed first, and the pressure must be confirmed to be zero before operation to prevent medium spraying and injury or equipment damage caused by disassembly under pressure.

Strengthen personnel protection and emergency response

Personal protective measures: Operators are required to wear protective goggles to prevent media leakage from splashing into their eyes; If calibrating high-pressure or corrosive media, it is also necessary to wear acid and alkali resistant gloves and protective clothing to avoid skin contact with the media causing injury.

Emergency response plan: In case of medium leakage, immediately stop pressurization, close the pressure source, and clean up the leaked material while ensuring safety. If the leaked medium is toxic, it is necessary to evacuate to a well ventilated area and wear a gas mask if necessary. If there is an emergency situation such as a pressure gauge bursting, it should be quickly moved away from the equipment and further processing should be carried out after confirming safety.

Calibrated safety closure

Pressure relief and cleaning: After calibration, slowly relieve all pressure, disconnect the pressure gauge from the pressure source, and then clean the surface and connection interface of the pressure gauge to prevent residual media from corroding the equipment.

Equipment relocation and recording: Properly store standards, pressure sources, and other equipment, and organize calibration tools. At the same time, record whether there are any abnormal situations (such as leaks, pressure fluctuations) during the calibration process, providing a basis for subsequent equipment maintenance.

In short, the safety core of calibrating stainless steel pressure gauges lies in "preventing leakage, overpressure, and misoperation". By standardizing operating procedures and taking protective measures, it can not only ensure personnel safety, but also ensure the accuracy of calibration results and the integrity of equipment.