Which of the following describes the minimum requirement for securing containers to prevent movement due to vessel motion?

• A. One bracket
• B. Three brackets
• C. Four brackets
• D. Two brackets

Answer: (D)

When a vessel moves, a cylinder must be restrained so it cannot translate or tip. Using just one bracket can still allow the cylinder to pivot or slide under rolling and pitching forces. Two brackets provide restraint at two points, creating a simple cradle that prevents both lateral movement and tipping, keeping the container securely in place during motion. Adding more than two brackets doesn’t meaningfully increase safety here and can complicate installation. So, two brackets are the minimum needed to prevent movement due to vessel motion.