The initial pressure test requires leakage detection that does not contain which of the following?

The initial pressure test is designed to verify the integrity of the gas piping system and ensure there are no leaks. For this test, it is critical to use a medium that allows for accurate detection of leaks without introducing harmful or inappropriate substances.

Choosing an option that contains ammonia would be unsuitable because ammonia can be corrosive and harmful, especially in medical environments where gases such as oxygen and nitrous oxide are used. Using a corrosive or toxic substance like ammonia could compromise the safety of the system and pose risks to patients and medical staff.

In contrast, methods that involve bubbles, soap, or water are many times employed for detecting leaks. These substances provide clear visual indicators when gas escapes from a fitting or joint, allowing for immediate identification of potential issues. Hence, the focus on using non-corrosive and safe detection methods is paramount in maintaining the integrity of medical gas systems, making the choice of ammonia inappropriate for leakage detection during an initial pressure test.