Which marking indicates the maximum working pressure for a 3AA tank?

The maximum working pressure for a 3AA tank is indicated as 2015 psi. This designation is significant because it reflects the specific design and manufacturing standards set for that type of pressure cylinder.

The 3AA designation applies to seamless steel cylinders that are designed for high pressure and must comply with rigorous safety standards due to the nature of the gases they typically store, such as oxygen and other medical gases. Understanding the maximum working pressure is crucial for safe usage, as exceeding this pressure can lead to cylinder failure, posing serious safety risks.

The other options reflect different pressures that are not standard for 3AA tanks. Knowing the proper maximum working pressure helps ensure that individuals handling the tanks adhere to safety protocols, thereby minimizing the risk of accidents related to improper handling or storage.