What is the maximum pressure that DOT cylinders can be subjected to?

The maximum pressure that Department of Transportation (DOT) cylinders can be subjected to is 125% of the marked service pressure. This is established to ensure safety and maintain the integrity of the cylinders during their use and handling. The service pressure marked on a cylinder indicates the maximum allowable working pressure under normal conditions. Allowing a cylinder to be subjected to 125% of this pressure provides a margin for safety during operations, such as filling or during thermal expansion, while still minimizing the risk of failure.

Maintaining cylinder integrity is essential to prevent accidents that can result from structural failures, and this standard reflects industry practices and regulatory requirements in the handling and storage of compressed gases.