? Diesel Storage Tanks interstitial monitoring systems
sensor placement · vacuum/pressure · alarm processing · routine testing
Strategic Sensor Placement at the Lowest Point
- Lowest point of the gap – optical or capacitive probes must be installed at the absolute bottom of the detection sump, where gravity draws any escaping fluid.
- Earliest detection – this precise placement ensures the fastest possible leak warning, critical for safety integrity.
Vacuum & Pressure Monitoring Systems
- Continuous negative pressure – maintaining a slight vacuum in the interstitial space allows active monitoring of pressure fluctuations.
- Dual‐wall breach indication – pressure drop indicates outer wall breach; pressure rise indicates inner tank leak, providing early warning before liquid reaches the sensor.
Centralized Alarm & Data Processing
- Intrinsically safe cabling – sensors connect to a central control panel that continuously processes signals and distinguishes fluid types.
- Immediate alerts and outputs – upon detection of a leak or malfunction, the panel triggers visual/audible alarms and can output relay signals to shut down pumps or valves.
Mandatory Routine Testing & Maintenance
- Periodic functional tests – typically quarterly or biannually, using specialised test fluids to verify sensor accuracy and alarm triggering.
- Inspection of electrical connections – all connections and sealed junction boxes must be checked for moisture ingress or physical damage to prevent false readings.
● always follow API 653 and local inspection requirements ● document all test results for regulatory compliance ●