Analysis of the maintenance and calibration process of fire pressure gauge

1. Spring aging and failure effects
The spring of the fire pressure gauge is in a high-pressure environment for a long time, and metal fatigue and chemical corrosion will cause the elasticity to decrease. Spring aging will cause deviations in the pressure gauge readings and fail to accurately reflect the actual pressure. Misjudgment of the pressure gauge readings may delay the timing of fire extinguishing or cause overpressure pipe burst accidents. Minor aging can be restored by sandpaper polishing or tension adjustment, and severe deformation requires replacement of springs of the same specification.

2. Maintenance and preventive measures
The fire pressure gauge should be set upstream of the check valve (to avoid interference from the high-level water tank pressure) and equipped with a buffer device. Check the pointer swing stability weekly and clean the valve core fouling monthly
In coastal or chemical environments, it is recommended to use gold-plated contacts or epoxy resin encapsulated pressure gauges to extend the service life.

3. Calibration technology and cycle management
Tool preparation: manual pressure pump, standard digital pressure gauge (accuracy level 0.4), adapter.
Multi-point test: pressurize at 20%, 40%, 60%, and 80% of the range points and record the error.
Pressure maintenance verification: maintain full-scale pressure for 3 minutes and observe the stability of the pointer.
Strong inspection cycle: pressure gauges used for safety protection need to be calibrated once every six months, and ordinary process monitoring gauges can be extended to 1 year.
Data management: establish electronic files to record calibration results and dynamically analyze error trends.