In the tank marking CTC/DOT 3AL 3000, what does the number 3000 represent?

The number 3000 in the marking CTC/DOT 3AL 3000 represents the maximum fill pressure of the tank in pounds per square inch (psi). This designation indicates that the tank is designed to safely hold gas at a maximum pressure of 3000 psi. It’s crucial for divers and tank users to know this rating, as it helps ensure safety when filling and using the tank under pressure. Understanding the correct pressure limits prevents overfilling, which could lead to catastrophic failure of the tank. Additionally, knowing the maximum fill pressure aids in selecting appropriate equipment and ensuring compliance with safety standards.