Class 5 Boiler Practice Exam

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What is the maximum temperature and pressure allowed for cast iron fittings on a code boiler?

200°F / 400 psi
250°F / 450 psi
300°F / 500 psi
350°F / 600 psi

The correct answer is: 250°F / 450 psi

The maximum temperature and pressure allowed for cast iron fittings on a code boiler are determined by industry standards that ensure safety and reliability. Cast iron is a material known for its strength up to certain thresholds but has limitations when it comes to temperature and pressure. The correct answer specifies a maximum temperature of 250°F and a maximum pressure of 450 psi. These limits align with safety codes that address the mechanical properties of cast iron, which can become brittle and lose structural integrity when subjected to higher temperatures or pressures. When examining the other options, they present either higher temperature limits or pressure limits that exceed the safe operational parameters defined for cast iron. Exceeding these limits can lead to material failure, which poses safety risks in a boiler system. Ensuring that fittings do not operate beyond these specified limits is vital for maintaining the system's integrity and safety. In summary, the maximum temperature of 250°F and pressure of 450 psi for cast iron fittings are established standards that prioritize safety and prevent potential failures in a boiler operated under code.