How long may an ASME propane container be used before needing recertification?

The correct answer is that an ASME propane container does not require recertification. This is based on the standards set forth by the American Society of Mechanical Engineers (ASME), which designates that these containers are built for a long service life—often exceeding 30 years—without the need for periodic recertification. ASME containers, unlike DOT (Department of Transportation) cylinders, are made to be permanent installations and are designed with the understanding that they will not be subjected to the same conditions that would necessitate recertification.

The other options suggest a timeframe for recertification that doesn't apply to ASME containers. For example, some DOT cylinders do require recertification after a specific period, such as 5 or 10 years, but that is not relevant for ASME containers. This distinction is crucial for understanding the different regulations governing propane storage and safety. Therefore, the ASME standard ensures that as long as the container is maintained properly and inspected, it can remain in service without the need for recertification.