System entry, often referred to as _______ is any activity that involves opening the system.

• A. Hot work
• B. Line break
• C. Lockout
• D. Venting

Answer: (B)

Opening the system means exposing its interior by breaking a line or vessel, which is exactly what the term line break describes. It captures any activity that involves opening a process line or equipment to access the inside for maintenance or inspection. This is why line break is the best fit for system entry, since it directly refers to opening how the system is connected and accessed.

Other terms describe related safety steps or different actions: hot work involves heat, sparks, or flame rather than simply opening the system; venting releases gas but doesn’t by itself imply opening the equipment; lockout is the isolation done to prevent energy release, not the act of opening the system.