What marking is required for cylinders that passed the Proof Pressure Method?

Cylinders that have passed the Proof Pressure Method must be marked with the Reinspection Identification Number (RIN) and the test date. This marking is critical as it provides important information about the cylinder's compliance with safety and regulatory standards. The RIN serves as a unique identifier for that specific cylinder and allows for tracking of inspection and maintenance history, ensuring the cylinder's integrity and safety for use in LP gas applications. Additionally, the test date indicates when the last proof pressure test was conducted, giving insight into the cylinder’s current condition and determining when the next inspection may be due to ensure ongoing safety.