ICC Commercial Mechanical Practice Exam

The maximum allowable operating pressure for a typical commercial boiler is generally in the range of 15-30 psi. This range is established based on industry standards and codes, which indicate that most commercial boilers are designed to operate safely and efficiently within this pressure range. Operating above this range can pose significant safety risks, including the potential for equipment failure or safety valve malfunction.

Boilers designed for low-pressure steam heating systems typically operate below 15 psi, while those with higher pressure requirements tend to fall within 15-30 psi. This ensures adequate heating capabilities while minimizing risks associated with high-pressure systems. Higher pressures, such as those indicated in other options, are typically reserved for specialized applications or specific industrial processes that require greater steam output or temperature control, rather than for standard commercial boiler usage. Therefore, the selection of 15-30 psi as the correct answer aligns well with standard operating parameters for typical commercial boilers, ensuring both efficiency and safety.