(a) In order to safeguard the health of persons and the environment, the commission may require that a combustible gas in a distribution line contain a natural odorant, or be odorized, so that at a concentration in air of one-fifth of the lower explosive limit the gas is readily detectable by a person having a normal sense of smell.

(b) In the concentrations in which it is used, the odorant in combustible gases must comply with the following:

(1) The odorant may not be deleterious to persons, materials or pipe.

(2) The products of combustion from the odorant may not be toxic when breathed nor may they be corrosive or harmful to those materials to which the products of combustion bull be exposed.

(3) The odorant may not be soluble in water to an extent greater than 2.5 parts to 100 parts by weight.

(c) Equipment for odorization must introduce the odorant without wide variations in the level of odorant.

(d) Each operator shall conduct periodic sampling of combustible gases to assure the proper concentration of odorant in accordance with this section.

History: Rule 02-01, eff 30 Aug 01.