Which of the following systems requires double barrier protection due to high pressure?

• A. High pressure (>1000 psi)
• B. High temp (>200 degrees)
• C. Sea connected systems
• D. Hull penetrations below waterline

Answer: (A)

High-pressure systems require double barrier protection because the energy stored in pressurized fluid can cause a rapid, dangerous release if a leak occurs. Two independent barriers are put in place so one contains the fluid under pressure, and a second acts as a backup if the first barrier fails, significantly reducing the chance that hazardous material reaches personnel or the environment and allowing time to shut the system down.

This requirement isn’t about high temperature, seawater connections, or hull penetrations. High temperature is managed through materials, insulation, and design choices; sea-connected systems are protected by measures suited to a marine environment; hull penetrations rely on maintaining watertight integrity rather than double containment for high pressure.