Canadian Entry To Practice (CETP) Practice Test

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What is the commonly used odorant for propane and at what ratio is it added?

Ethyl Mercaptan, 1 pound per 5,000 gallons of propane.
Ethyl Mercaptan, 1 pound per 10,000 gallons of propane.
Propyl Mercaptan, 1 pound per 10,000 gallons of propane.
Butyl Mercaptan, 1 pound per 10,000 gallons of propane.

The correct answer is: Ethyl Mercaptan, 1 pound per 10,000 gallons of propane.

The correct answer is that ethyl mercaptan is the commonly used odorant for propane and it is added at a ratio of 1 pound per 10,000 gallons of propane. Ethyl mercaptan is favored because it imparts a distinctive and strong smell to the otherwise odorless propane, making it easier to detect leaks and prevent hazardous situations. The detection of this odor is crucial for safety, as propane can be dangerous if it accumulates without a noticeable odor. The ratio of 1 pound per 10,000 gallons is a standard guideline that balances adequate odor detection with cost-effectiveness for propane suppliers. This amount ensures that even a small leak can be identified by the presence of the odor, thereby enhancing safety for users and surrounding areas.