192.625—Odorization of gas.
(a)
A combustible gas in a distribution line must 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 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 paragraph (a) of this section unless:
(1)
At least 50 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;
(3)
In the case of a lateral line which transports gas to a distribution center, at least 50 percent of the length of that line is in a Class 1 or Class 2 location; or
(c)
In the concentrations in which it is used, the odorant in combustible gases must comply with the following:
(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)
To assure the proper concentration of odorant in accordance with this section, each operator must conduct periodic sampling of combustible gases using an instrument capable of determining the percentage of gas in air at which the odor becomes readily detectable. Operators of master meter systems may comply with this requirement by—
(1)
Receiving written verification from their gas source that the gas has the proper concentration of odorant; and
(2)
Conducting periodic “sniff” tests at the extremities of the system to confirm that the gas contains odorant.
[35 FR 13257, Aug. 19, 1970]