PADI Nitrox Final Exam: What Steps Must Be Followed If a Part Fails the Oxygen Clean Test?

The PADI Nitrox course emphasizes the importance of ensuring that all equipment and parts are 'Oxygen Clean' before use in an oxygen-rich environment. One crucial step in achieving this is passing the Oxygen Clean test, which confirms whether a part is contaminated or not. But what happens if a part fails the Oxygen Clean test? In this article, we will explore the necessary steps to follow when a part does not pass the test.

According to PADI guidelines, if a part fails the Oxygen Clean test, it must be thoroughly inspected and cleaned before further use. The first step is to perform a white light visual inspection using a 60-100 watt light bulb (Step 1). This helps identify any visible contaminants or debris on the surface of the part.

Next, a water break test is performed using an atomizer with a thin layer of water (Step 2). If the water breaks through the surface of the part, it indicates contamination. A swipe test is then conducted using a lint-free cloth and threads to further inspect for any remaining contaminants (Step 3).

If the part still fails to pass these tests, it must be taken out of service immediately and removed from the system. PADI recommends performing an inspection and cleaning procedure as outlined in their guidelines.

In addition to visual inspections, PADI also emphasizes the importance of using the correct pre-cleaning solutions before attempting a final clean. Some pre-cleaners may leave behind a slight organic residue, which can interfere with the Oxygen Clean test results. It is essential to use only alkaline-based cleaners specifically designed for oxygen-compatible systems.

Gross cleaning parts involves completely disassembling all equipment and reassembling it after cleaning (Step 4). This ensures that all contaminants are removed from the system.

To determine whether a part is truly 'Oxygen Clean,' PADI recommends using qualitative and quantitative cleanliness measurement techniques. Verifiable absence of particulate, fiber, oil, grease, and other contaminants must be confirmed before the part can be considered Oxygen Clean (Step 5).

When it comes to lubricants, PADI requires that they be hydrocarbon and silicone-free to ensure oxygen compatibility. Material compatibility is also critical, as it refers to the ability of materials to coexist with elevated O2 concentrations without flashing.

In summary, if a part fails the Oxygen Clean test, it must be thoroughly inspected and cleaned before further use. This involves visual inspections, water break tests, swipe tests, and the use of alkaline-based cleaners specifically designed for oxygen-compatible systems. By following these steps, you can ensure that your equipment is safe to use in an oxygen-rich environment.

8 Design Features for Oxygen Systems

1. Short pipes on Teflon-lined braid hoses

2. Filters in place, ahead of high-velocity components

3. Gauges installed in protected places

4. Oxygen-compatible materials used throughout the system

5. Components designed to minimize friction and heat generation

6. Static-resistant materials used wherever possible

7. Electrical connections designed to prevent sparks and arcs

8. Grounding points provided for all electrical components

Preventing Sparks, Arcs, and Frictional Heating

To prevent sparks, arcs, and frictional heating in oxygen systems, it is essential to ensure proper functioning and grounding of equipment. This can be achieved by visually inspecting all valves, using a 10x microscope to look for fibers or shavings, listening for gas escaping from closed valves, and testing for leaks.

Preventing Particle Impingement

To prevent particle impingement, it is essential to use monel or brass components within 10 times the diameter of the hose. Additionally, when installing the system, care should be taken to avoid introducing burs or other contaminants into the system. Finally, all valves should be purged with inert gas before use.

By following these guidelines and taking the necessary precautions, you can ensure that your equipment is safe to use in an oxygen-rich environment. Remember, safety always comes first when working with oxygen systems.

Padi nitrox final exam