What method verifies that the test apparatus has no leaks before applying test pressure?

What method verifies that the test apparatus has no leaks before applying test pressure?

• A. Weigh the tank to ensure it's sealed.
• B. Apply maximum pressure immediately and observe for any change.
• C. Perform a pre-test leak check by applying test pressure for a short duration and observing for any pressure loss with the system isolated.
• D. Conduct a visual inspection only.

Answer: (C)

A pre-test leak check is done to confirm the test rig itself is airtight before you put the system under the actual test pressure. You pressurize the setup for a short period while the system is isolated from the outside, then watch for any pressure drop. If the pressure stays steady, you can trust that the test apparatus has no leaks and proceed to the real test. If pressure falls, the leak is in the test setup (hoses, fittings, seals, gauges), so you fix it before proceeding. Weighing the tank won’t catch leaks in the test apparatus. Applying maximum pressure immediately can mask leaks and is unsafe, since issues in the rig could be mistaken for the tank’s behavior. A visual inspection alone may miss small leaks and doesn’t reveal dynamic sealing under pressure.

A pre-test leak check is done to confirm the test rig itself is airtight before you put the system under the actual test pressure. You pressurize the setup for a short period while the system is isolated from the outside, then watch for any pressure drop. If the pressure stays steady, you can trust that the test apparatus has no leaks and proceed to the real test. If pressure falls, the leak is in the test setup (hoses, fittings, seals, gauges), so you fix it before proceeding.

Weighing the tank won’t catch leaks in the test apparatus. Applying maximum pressure immediately can mask leaks and is unsafe, since issues in the rig could be mistaken for the tank’s behavior. A visual inspection alone may miss small leaks and doesn’t reveal dynamic sealing under pressure.