Why should a leak detector be used after assembling gas or water lines?

• A. To test for color.
• B. To verify there are no leaks in the connections.
• C. To measure flow rate.
• D. To calibrate measurement tool.

Answer: (B)

The main idea is to verify that all joints and connections are sealed so no gas or water can escape. After assembling lines, a leak detector is used to confirm there aren’t any leaks before the system is put into service. This protects against hazards like gas leaks, fire or explosion risks, water damage, and wasted resources. If a leak is found, fittings or components can be tightened or replaced and the test repeated until the system holds at the required pressure.

Testing for color isn’t how leaks are found, and measuring flow rate or calibrating a tool aren’t about checking the integrity of connections. Those tasks serve different purposes.