Where can the maximum allowable working pressure of an ASME tank be found?

The maximum allowable working pressure (MAWP) of an ASME tank is clearly identified on the data plate affixed to the tank. This plate serves as a vital source of information, including not just the MAWP but also other important parameters such as the tank’s design specifications, material of construction, and the manufacturer's details. The presence of this data on the tank itself ensures that operators have immediate access to critical safety information.

While safety manuals contain guidelines and procedures related to the operation of pressure vessels, they do not provide the specific MAWP for any particular tank. A pressure gauge indicates the pressure inside the tank during operation but does not specify the maximum allowable limits. Lastly, an inspection report may provide findings related to the tank's structural integrity and compliance but would not typically include the tank’s design specifications like the MAWP. Thus, referring directly to the data plate is the most reliable means to determine the MAWP of an ASME tank.