2. System Overview
The Emergency Push Button is a critical safety component of the LPG leakage detection system. Upon activation, it is designed to:
• Immediately close the LPG solenoid valve
• Activate audible alarms (sirens)
• Provide a manual emergency shutdown of gas supply
3. Observed Faults
During inspection, the following issues were identified:
1. Faulty Internal Mechanism of Push Button
o The internal logic/mechanism of the push button was damaged.
o The push button failed to generate output signal upon activation.
2. Incorrect Wiring Configuration
o Wiring connections to the push button were found to be improper and not as per standard/control logic.
o Signal transmission from the push button to the control panel was not achieved.
3. System Response Failure
o Pressing the push button did not result in:
Solenoid valve closure
Siren activation
4. Rectification Procedure
The following corrective actions were carried out systematically:
4.1 System Inspection
• Complete inspection of push button, wiring, and associated control loop conducted.
• Continuity and signal path verification performed.
4.2 Wiring Rectification
• Identified incorrect wiring connections and deviations from control logic.
• Rewired the push button circuit as per approved system design and standard wiring practices.
• Ensured proper termination and secure connections.
4.3 Push Button Replacement
• Removed the faulty push button unit.
• Installed a new, fully functional emergency push button.
• Verified internal contact operation and signal output.
4.4 Functional Testing
• Conducted complete functional testing of the system:
o Activated push button manually.
o Verified instant closure of solenoid valve.
o Verified activation of siren/alarm system.
• Confirmed proper communication with control panel.
5. Current Status
• Emergency Push Button is fully operational.
• System response is 100% functional and compliant:
o ✔️ Solenoid valve closes immediately upon activation
o ✔️ Siren activates as per safety requirement
• Wiring is corrected and secured as per standard.
• System tested and verified under operational conditions.
6. Conclusion
The identified faults in the Emergency Push Button system, including incorrect wiring and internal device failure, have been successfully rectified. The system is now operating as per the intended safety design and meets functional requirements.
The LPG safety system at Restaurant Lisa is fully functional, and there are no safety concerns related to the emergency shutdown mechanism.
7. Recommendation
• The system is safe for continued operation.
• No restriction on gas supply is required.