For low pressure cylinders without specified pressure, to what pressure shall they be tested?

Low pressure cylinders that do not have a specified test pressure must be tested to ensure their integrity and safety under operational conditions. The established standard for testing such cylinders is to apply a pressure that does not exceed three times the service pressure. This practice is rooted in safety protocols designed to thoroughly assess the performance and reliability of the cylinder under potential extreme conditions without risking catastrophic failure during normal usage.

Testing to this level allows for a comprehensive examination of the cylinder's construction and can help identify any weaknesses or defects. This threefold pressure is a common industry standard that ensures a margin of safety for operations, aligning with guidelines from relevant safety organizations. This approach is critical for maintaining safety standards within the fire department and other applications where low pressure cylinders are employed.