What does the boiler code state about the capacity of a relief valve used on a boiler?

The boiler code specifies that the capacity of a relief valve must be sufficient to vent the pressure of the boiler along with any additional pressure that might be generated if the heat source continues to operate. This requirement is crucial for ensuring safety; if the relief valve were to fail or if it were not rated to handle the maximum potential pressure, it could lead to dangerous situations such as boiler explosions or system failures.

By maintaining this requirement, the code ensures that the relief valve can adequately handle both normal operating pressure and the excess pressure that could occur during conditions like overfiring or system malfunctions. This protective measure is a fundamental aspect of boiler design and operation, aiming to prevent hazardous pressure build-up in the system.

The focus on adequate capacity helps ensure that the relief valve acts effectively when needed, providing a critical safety function in boiler systems.