How To: Testing Proof of Closure Safety
Learn how to test the Proof of Closure (POC) Safety on a steam boiler. In this video, we walk through the procedure for testing the proof of closure device and verifying that it confirms the gas valve is fully closed before allowing the burner sequence to proceed.
The proof of closure safety is a critical component of the boiler’s fuel train. It verifies that the designated gas valve is closed before burner operation is permitted. Proper testing confirms that the device responds correctly and helps ensure the integrity of the fuel train safety sequence.
Topics covered include:
- Identifying the proof of closure safety device on the boiler gas train
- Understanding its purpose and function within the fuel train
- Preparing the boiler and controls for testing
- Initiating the proof of closure test condition
- Verifying detection of the gas valve’s closed position
- Confirming proper boiler response to the proof of closure signal
- Verifying that burner operation is permitted only when required conditions are met
- Resetting the safety and returning the boiler to normal operation
Whether you’re a service technician, commissioning technician, facility maintenance professional, or boiler operator, this guide provides a practical overview of proof of closure safety testing as part of steam boiler commissioning and maintenance.
Proof of closure safety testing should only be performed by qualified personnel familiar with the boiler, gas train, and applicable safety requirements. Always follow the appropriate Fulton installation, operation, and service documentation, gas train manufacturer instructions, and applicable codes and regulations. Verify the correct procedure for the specific boiler and gas valve configuration before making adjustments.
← View all videos