What is the maximum test pressure when testing a low-pressure centrifugal system with nitrogen?

The maximum test pressure for a low-pressure centrifugal system when using nitrogen for testing is correctly identified as 10 psig. This standard is set to ensure the integrity of the system while avoiding potential damage due to excessive pressure.

Using nitrogen allows technicians to safely check for leaks and to verify the overall system integrity without introducing moisture or contaminants that could damage the components. Test pressures that exceed the recommended limits risk compromising system parts or creating unsafe conditions during the testing process.

In the context of refrigerant systems and EPA regulations, knowing the appropriate testing pressure is essential for compliance and safety. Keeping the test pressure within these limits ensures that the system can withstand operational pressures once it is fully charged with refrigerant gas, thus maintaining performance and avoiding failures.