What is the required pressure for air testing new single-walled product piping according to the manufacturer's standards?

The correct choice reflects the manufacturer's standard requirements for air testing new single-walled product piping. According to industry guidelines, the air testing of such piping typically involves applying a pressure of 50 Psig (pounds per square inch gauge) over a duration of 1 hour. This level of pressure is significant enough to ensure that any potential leaks in the piping system can be detected effectively without compromising the integrity of the system itself.

A pressure of 50 Psig is often used because it exceeds the operational pressures that the system may encounter during normal functioning, allowing for a thorough assessment of the piping's resilience and leak-tightness. Testing at this high pressure, within a controlled timeframe, helps to ensure that installations meet safety and regulatory standards, protecting both the environment and the public.

The one-hour duration is sufficient for the test to be reliable without subjecting the piping to undue stress over an extended period. Overall, this standard is crucial for establishing the safety and dependability of the product piping, making it essential for compliance with best practices in UST installation and retrofitting.