What is the function of the tri-directional burst disc in the SCBA?

The tri-directional burst disc plays a crucial safety role in the SCBA by relieving excess pressure in the system. When the pressure exceeds a specific threshold—specifically at 7000 psi or when temperatures reach approximately 400 degrees Fahrenheit—the burst disc activates and opens, allowing air to escape. This function is vital to prevent potential failure of the tank, which could occur under extreme conditions, thereby protecting both the user and the equipment.

Ensuring that the SCBA operates within its safe pressure limits is essential for safe operation in hazardous environments, as excessive pressure could lead to catastrophic failure. The burst disc thus serves as a reliable safeguard against these risks.