What must happen to all cylinders and apparatuses, except water-based ones, after testing?

After testing, all cylinders and apparatuses, except for those that are water-based, must be thoroughly dried to ensure their reliability and safety for future use. Moisture left on the cylinders or apparatuses can lead to corrosion or other damage that compromises their structural integrity and function.

Thorough drying helps eliminate any residual moisture that could cause issues over time, such as rust or degradation of materials used in the construction of the apparatus. This step is crucial for maintaining the equipment in good working condition and ensuring that it performs effectively when needed.

Choosing to store them with pressure, repaint them immediately, or pressure test them again does not address the immediate need to prevent moisture-related damage. Therefore, thorough drying is the best practice to follow after testing.