In shipboard piping, what does the striped red and green pattern indicate?

• A. Striped GRAY AND WHITE
• B. Striped RED AND GREEN
• C. Brown
• D. Striped RED AND GREEN

Answer: (D)

On shipboard piping, color and stripe patterns are used to identify what a pipe carries at a glance. The striped red and green pattern is a marking used to identify potable water lines in the ship’s distribution system. Green signals potable water, while the red accent helps draw attention to the line as a service that must be treated with care and verified before any work is done. When you see that pattern, check the ship’s piping diagrams and valve tags to confirm the exact service before operating valves or connecting hoses. Other color schemes don’t match the standard markings for this line, so the striped red and green pattern is the correct cue.