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PDFWAC 296-307-41007

When must LP-gas be odorized?

You 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.
Odorization is not required if it will create a hazard in further processing, or if it serves no useful purpose as a warning agent.
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. You may use any odorant and quantity that meets the requirements of this section.
[WSR 97-09-013, recodified as § 296-307-41007, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-41007, filed 10/31/96, effective 12/1/96.]
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