CTR 156CT Propane Practice Test

How can you detect a propane leak if there is no odor?

Listen for a hiss and call emergency services Check the color of the gas Check the gas cylinder gauge for leak alerts Apply a soap-and-water solution to joints and connections and look for bubbles

Correct Answer:

Apply a soap-and-water solution to joints and connections and look for bubbles

Explanation:

Propane leaks must be detected by physical signs, since odor alone isn’t reliable. Propane is colorless and the odorant can fail, so you can’t depend on smelling something to know there’s a leak. Listening for a hiss isn’t consistent either, as many leaks are small or occur where you can’t hear them. A practical and reliable method is to apply a soap-and-water solution to joints, connections, and hoses. If there’s a leak, escaping gas will cause bubbles at the leak points, making it visible. If you see bubbles, shut off the gas at the main valve or cylinder, move away, avoid sparks or flames, and call emergency services or your gas supplier. The cylinder gauge shows pressure or how full the cylinder is, not whether there’s a leak, so it’s not a leak-detection method.

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