SUBSAFE is the US Navy qualification standard for submarine construction and repair. The key discrete boundary groups in SUBSAFE are:
1. Pressure Hull Boundary - Includes the hull, appendages, openings, and penetrations below the main deck that resist sea pressure.
2. Main Sea Valve Boundary - Comprises the main sea valves and associated piping and valves that isolate openings below the main deck from the sea when shut.
3. Vital Machinery Boundary - Encompasses propulsion systems, electrical generators and switchboards, steering gears, and other equipment essential for nav/safety.
4. Command and Control Boundary - Covers navigation and communications systems used by operators to maneuver and manage the boat.
5. Emergency Boundary - Incorporates emergency systems like blow and vent lines that can be rapidly activated in flood situations.
So in summary - the key SUBSAFE discrete boundary groups are the pressure hull, main sea valves, vital machinery, command and control systems, and emergency systems. Proper separation and isolation of these boundaries is crucial to submarine survivability and safety.
