Final answer:
Sealed life preservers should not be opened for inspection or demonstration as it can compromise their buoyancy and reliability, which is critical in emergency situations.
Step-by-step explanation:
Sealed and safety tied portions of the life preservers should not be opened for the purpose of inspection or demonstration. These life-saving devices are packaged in a way to ensure their integrity and effectiveness in the event of an emergency. Opening a sealed life preserver can compromise its buoyancy and reliability, which is why they often come with clear instructions not to be tampered with unless in a real emergency situation where their use is necessary. It is important for safety drills and demonstrations to use training equipment that is specifically designated for that purpose, keeping actual life-saving equipment intact and ready for use when needed.