Canadian Entry To Practice (CETP) Practice Test

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When a cylinder is re-qualified using the proof pressure method, which letter code is added to the date stamp?

The correct answer is: S

When a cylinder is re-qualified using the proof pressure method, the letter code that is added to the date stamp is "S". This code signifies that the cylinder has undergone a proof pressure test, which involves subjecting the cylinder to a pressure higher than its operating pressure to ensure integrity and safety. The inclusion of the "S" code indicates to users and inspectors that the cylinder has met the necessary standards and has been deemed safe for continued use after this rigorous testing. This re-qualification process is crucial for maintaining high safety standards in handling and storing gases. In contrast, other codes might indicate different types of tests or re-qualification methods, but "S" specifically refers to the proof pressure testing method, making it the correct answer in this context.