(a) In addition to NFPA 52 §5.2.1.1, compressed natural gas shall be odorized according to the provisions of Texas Utilities Code, §§121.251 and 121.252.
(b) Containers installed in accordance with NFPA 55 that will contain unodorized CNG shall be legibly marked "NON‑ODORIZED" or "NOT ODORIZED" on two opposing sides of the container.

Source Note: The provisions of this §13.22 adopted to be effective November 15, 1990, 15 TexReg 5936; amended to be effective October 22, 2001, 26 TexReg 8342; amended to be effective February 15, 2021, 46 TexReg 1035