For which classes above 15 PSI must excess flow control be provided?

Excess flow control is critical for safety when dealing with non-flammable compressed gases, especially at higher pressures. In the context of this question, classes that correspond to pressures above 15 PSI require specific safety measures to manage the risks of excessive gas flow.

Classes 3 and 4 encompass gases that, at pressures above 15 PSI, can pose a greater risk of leaks and potential hazards. The implementation of excess flow control in these classes ensures that if a pipe or valve fails, the flow of gas is quickly reduced, thereby minimizing the risk of an incident. This adds an essential layer of safety to the handling and usage of these gases.

Understanding the need for excess flow control in specific pressure classes emphasizes the importance of safety devices in preventing accidents and promoting safe storage and transport practices for compressed gases.