What time and pressure should the standing pressure test for positive pressure medical gas piping be conducted at?

The standing pressure test for positive pressure medical gas piping is conducted at 24 hours at 20% above normal operating pressure because this approach ensures the integrity of the system under conditions that exceed typical operating circumstances. Conducting the test for this extended duration allows any potential leaks to become apparent, as they are more likely to manifest when the system is subjected to additional stress.

Using a pressure level that is 20% above normal operational pressure serves to simulate conditions the system may encounter during use, providing a thorough evaluation of the piping system's ability to maintain pressure. This is crucial in a medical setting where leaks can compromise patient safety and the effective delivery of medical gases.

In contrast, other choices either do not provide sufficient time for leaks to manifest or do not test the system under conditions that closely align with its maximum operational capacity, ultimately falling short of the thorough assessment necessary for medical gas piping systems.