What is an acceptable test medium aside from air and nitrogen?

Using carbon dioxide as a test medium is recognized as acceptable due to its non-toxic and non-flammable properties. In the context of pressure testing in the propane industry, ensuring the safety and reliability of systems is paramount. Carbon dioxide is heavier than air and doesn't pose the same flammability risks that some gases do, making it a safer alternative in many situations.

In pressure testing applications, the key concern is to detect leaks without creating hazardous conditions. While air and nitrogen are commonly used, carbon dioxide can also serve this purpose effectively. Its physical properties allow it to reveal leaks in a controlled environment, effectively helping technicians to ensure system integrity.

Other gases mentioned, such as carbon monoxide, are typically avoided because they are toxic; helium and argon, while inert and safe, are usually not preferred in comparison to more common test mediums for specific applications.