Which PSI value listed on the ASME data plate can be filled?

• A. 200
• B. 300
• C. 250
• D. 312

Answer: (C)

The key idea is that the ASME data plate shows the maximum allowable working pressure the vessel is designed to handle in normal service. The value you can safely fill to is that maximum rating. It’s the limit you must not exceed when filling.

In this plate, the rated pressure is 250 psi. That means the vessel can be filled up to 250 psi but not higher. Values like 300 or 312 psi exceed the plate’s rating and are unsafe, while 200 psi is below the limit but does not represent the full safe filling pressure. The other numbers might correspond to test or higher-condition ratings, not the normal fill pressure. So the correct fill pressure is 250 psi.