Canadian Entry To Practice (CETP) Practice Test

Can a simple "sniff test" be used to detect the odorant in propane?

1. Yes

2. No

3. Only for small leaks.

4. Only when wearing PPE.

The correct answer is: Yes

A simple "sniff test" can indeed be used to detect the odorant added to propane because propane itself is odorless. To make it detectable by smell, an odorant such as ethyl mercaptan is introduced into the gas. This odorant has a distinct and strong smell, often described as resembling rotten eggs. When individuals smell propane, they are actually detecting this added odorant. Consequently, if a person is trained and aware of the strong scent of the odorant, they can perform a sniff test to determine the presence of propane. This method is commonly used as a preliminary way to detect leaks before any more sophisticated forms of detection are employed. In practice, while the sniff test can be a useful first step, it is important to approach all gas detection with caution and to use proper safety measures, especially if a leak is suspected.