HAR 6-77-169 Odorization of gas

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 with a normal sense of smell. (b) After December 31, 1976, a combustible gas in a transmission line in a Class 3 or Class 4 location must comply with the requirements of subsection (a) unless: (1) At least fifty percent of the length of the line downstream from that location is in a Class 1 or Class 2 location; (2) The line transports gas to any of the following facilities which received gas without an odorant from that line before May 5, 1975; (A) An underground storage field; (B) A gas processing plant; (C) A gas dehydration plant; or (D) An industrial plant using gas in a process where the presence of an odorant; (i) Makes the end product unfit for the purpose for which it is intended; (ii) Reduces the activity of a catalyst; or (iii) Reduces the percentage completion of a chemical reaction; or (3) In the case of a lateral line which transports gas to a distribution center, at least fifty percent of the length of that line is in a Class 1 or Class 2 location. (c) 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 will be exposed. (d) The odorant may not be soluble in water to an extent greater than 2.5 parts to 100 parts by weight. (e) Equipment for odorization must introduce the odorant without wide variations in the level of odorant. (f) Each operator shall conduct periodic sampling of combustible gases to assure the proper concentration of odorant in accordance with this section. [Eff ] (Auth: HRS '269-6) (Imp: 49 C.F.R. '192.625, October 1, 1990)