What is the purpose of a leak test after connecting a cylinder to a system?

• A. To measure the volume of propane in the cylinder
• B. To check the color coding of hoses
• C. To ensure there are no leaks at connections before starting dispensing
• D. To verify the date of manufacture

Answer: (C)

A leak test after connecting a cylinder to a system is done to verify there are no leaks at connections before starting dispensing. This step is essential because propane is flammable and stored under pressure; even a tiny leak at joints, valves, or fittings can create a fire hazard or lead to a dangerous buildup. The test involves slightly pressurizing the system and checking for leaks, often by applying a soap solution to joints or using a leak-detection device. If bubbles appear or the pressure changes, there’s a leak that must be fixed before proceeding. This isn’t about measuring how much propane is in the cylinder, checking hose color codes, or verifying manufacture dates.