When preparing a new piping system for an air test, what should be isolated?

When preparing a new piping system for an air test, both the tanks and dispensers should be isolated to ensure accurate results and effective pressure testing. Isolating the entire system, including tanks and dispensers, allows for a controlled environment where any potential leaks can be detected. The air test is conducted to confirm the integrity of the piping system, and if either the tanks or dispensers remain connected, it may introduce variables that could lead to false readings or failures in detecting leaks.

By fully isolating the components, operators can ensure that the entire system is examined as a whole, making it easier to identify any vulnerabilities in the piping. This is essential for compliance with safety regulations and to maintain environmental safeguards, as undetected leaks could pose significant risks. Hence, isolating both the tanks and dispensers is a crucial step in the preparation process for an effective and reliable air test.