AL Pipelines Practice Questions - Alabama Pipelines Contractor Examination Exam

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Federal pipeline safety regulations require that combustible gas in a distribution line be odorized so that it is readily detectable by a person with a normal sense of smell at what concentration in air?

One-fifth of the lower explosive limit One-half of the lower explosive limit At the upper explosive limit At 100 percent gas in air

Correct Answer:

One-fifth of the lower explosive limit

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