Which device on a vehicle-mounted ASME tank indicates the maximum liquid level?

• A. Fixed maximum liquid level gauge
• B. Relief valve
• C. ASME data plate
• D. Pressure gauge

Answer: (A)

When you’re checking how full a vehicle-mounted ASME tank can be, the device that actually shows the limit is a fixed maximum liquid level gauge. This gauge is designed specifically to indicate the tank’s approved maximum liquid level and remains set to that limit, giving a clear stop point to prevent overfilling.

Relief valves are safety devices that vent gas if pressure gets too high, so they don’t tell you anything about how full the tank is. The ASME data plate lists design and rating information, such as capacity and pressure, but it isn’t a live indicator of liquid level. The pressure gauge measures internal pressure, not how much liquid is in the tank.

So, the fixed maximum liquid level gauge is the best choice for indicating the maximum liquid level.