Section 6-77-16 - Petroleum gas systems(a) No operator may transport petroleum gas in a system that services ten or more customers, or in a system, any portion of which is located in a public place (such as a highway), unless that system meets the requirements of this chapter and of NFPA Standards No. 58 and No. 59. In the event of a conflict, the requirements of this chapter prevail.(b) Each petroleum gas system covered by subsection (a) must comply with the following: (1) Aboveground structures must have open vents near the floor level;(2) Belowground structures must have forced ventilation that will prevent any accumulation of gas;(3) Relief valve discharge vents must be located so as to prevent any accumulation of gas at or below ground level;(4) Special precautions must be taken to provide adequate ventilation where excavations are made to repair an underground system.(c) For the purpose of this section, petroleum gas means propane, butane, or mixtures of these gases, other than a gas air mixture that is used to supplement supplies in a natural gas distribution system.[Eff ] (Auth: HRS § 269-6) (Imp: 49 C.F.R. §192.11, OCT 1, 1990)