1. The commission shall make, promulgate and enforce regulations setting forth general standards covering the design, construction, location, installation and operation of equipment for storing, handling, transporting by tank truck, tank trailer, and utilizing liquefied petroleum gases and specifying the odorization of such gases and the degree thereof. The regulations shall be such as are reasonably necessary for the protection of the health, welfare and safety of the public and persons using such materials, and shall be in substantial conformity with the generally accepted standards of safety concerning the same subject matter. Such regulations shall be adopted by the commission pursuant to chapter 536. Any rule or portion of a rule, as that term is defined in section 536.010, that is promulgated under the authority of this chapter, shall become effective only if the authority has fully complied with all of the requirements of chapter 536 including but not limited to section 536.028 if applicable, after January 1, 1999. All rulemaking authority delegated prior to January 1, 1999, is of no force and effect and repealed as of January 1, 1999, however nothing in this act shall be interpreted to repeal or affect the validity of any rule adopted and promulgated prior to January 1, 1999. If the provisions of section 536.028 apply, the provisions of this section are nonseverable and if any of the powers vested with the general assembly pursuant to section 536.028 to review, to delay the effective date, or to disapprove and annul a rule or portion of a rule are held unconstitutional or invalid, the purported grant of rulemaking authority and any rule so proposed and contained in the order of rulemaking shall be invalid and void, except that nothing in this act shall affect the validity of any rule adopted and promulgated prior to January 1, 1999.

2. Except as specifically provided in subsection 1 of section 323.060, regulations in substantial conformity with the published standards of the National Board of Fire Underwriters for the design, installation and construction of containers and pertinent equipment for the storage and handling of liquefied petroleum gases as recommended by the National Fire Protection Association shall be deemed to be in substantial conformity with the generally accepted standards of safety concerning the same subject matter.