How many pressure relief devices are required on ASME containers?

The requirement for pressure relief devices on ASME (American Society of Mechanical Engineers) containers, particularly for those used in propane service, is that each container must be equipped with at least one pressure relief device. This is essential for safety, as these devices act as a critical safeguard against excessive pressure that could lead to catastrophic failures or explosions. The design and installation of these devices ensure that the pressure inside the container remains within safe limits, allowing for the safe storage and use of propane.

While some larger containers or specific configurations may require more than one device, the baseline requirement set by ASME standards is one. This single device must be capable of relieving pressure in the event of thermal expansion or other pressure-increasing scenarios, thereby protecting both the container and any surrounding infrastructure from dangerous overpressurization.

Other options regarding additional pressure relief devices may apply in certain situations or for specific types of containers, but the fundamental requirement is that at least one is needed.