In a medical gas installation, what is the minimum number of braised joints that must be inspected?

• A. Two joints
• B. Three joints
• C. Four joints
• D. Five joints

Answer: (B)

In medical gas systems, braised joints are critical points where leaks can occur, so inspecting them is a key part of ensuring overall system safety. A representative check is done by examining a sample of joints rather than every single one, to verify that brazing was done correctly across the installation.

The minimum number to inspect is three joints. Inspecting three joints provides enough coverage to catch common issues that can arise in different sections or types of joints, without needing to test every joint. If only two joints were checked, there’s a higher chance of missing a defect due to variation in workmanship or joint conditions. Checking more than three is beneficial for thoroughness, but three is the established minimum for a reliable quality check.