ICC Commercial Mechanical Practice Exam

In accordance with the International Building Code, safety relief vents are primarily mandated for systems that convey combustible stock. This requirement is based on the potential for combustion or explosion risks associated with combustible materials. When combustible materials are processed or conveyed, there is a risk that pressure buildup might occur, which could lead to catastrophic failures if not properly vented. Safety relief vents serve as a crucial safety measure to prevent such incidents by allowing for the controlled release of pressure, thereby mitigating hazards associated with the handling of combustible stocks.

The other types of stock, such as gaseous, fine dust, and liquids, may also have safety and pressure considerations, but the specific requirement for safety relief vents is highlighted for combustible materials due to their potential to ignite and cause explosive reactions under pressure. Hence, the requirement for a safety relief vent is particularly pertinent in applications that handle combustible substances.