WAC 296-307-41007. Odorizing LP-gas

The employer must ensure that all LP-gas is odorized by an approved agent to indicate by distinct odor, the presence of gas down to concentration in air of a maximum of 1/5 the lower limit of flammability. Exception: Odorization is not required if it will create a hazard in further processing, or if it serves no useful purpose as a warning agent. Note: The odorization requirement may be met by using 1.0 pounds of ethyl mercaptan, 1.0 pounds of thiophene, or 1.4 pounds of amyl mercaptan per ten thousand gallons of LP-gas. The employer may use any odorant and quantity that meets the requirements of this section.