Class 5 Boiler Practice Exam

The maximum temperature and pressure for cast iron fittings that can be used on a code boiler is indeed 250-450 psi. This range reflects the material limitations of cast iron, which is commonly used in the construction of valves and fittings due to its durability and strength.

Cast iron fittings can handle pressures up to around 450 psi at temperatures typically encountered in boiler systems. Beyond this range, the risk of material failure increases significantly, compromising safety and operational integrity. Higher pressures and temperatures can lead to issues such as cracking, warping, or even bursting of the fittings, which are critical aspects to ensure effective functionality and safety in boiler operations.

The other ranges provided do not align with the established standards for cast iron fittings in boiler applications, potentially leading to safety risks if used outside the acceptable limits. Therefore, understanding the specific limitations of materials used in your systems is crucial for compliance and safety in boiler management.