Pressurize the system with dry nitrogen to inspect for _____.

• A. Contamination
• B. Leaks
• C. Moisture
• D. Pressure Drops

Answer: (B)

Pressurizing with dry nitrogen is used to check for leaks because it creates an inert, moisture-free environment and makes any escape paths easy to detect. If there are leaks, the pressurized gas will escape through the faulty joints or fittings, causing a measurable pressure loss or visible/semi-visible leakage when you inspect with a leak-detection method (such as soapy solution or a leak detector). The dryness matters because water vapor in a system can mask leaks, cause condensation, or lead to corrosion or ice formation that complicates the test. This test isn’t about checking for contamination or moisture directly; it’s about finding leak paths by observing whether the pressurized gas stays contained.