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11'W SAi,E OF :..PPLI ;LACES SECTION 16. .1 (1) All new gas appliances hereafter sold gfferod for sale, or installed within the corporate limits of shall be of a design and construction approved .s o safety, cf icien- cy, and durability and shall bear information showing the rated heat input in B.T.U. per hour and equipped by the manufacturer for use with natural. gas. (2) All used gas appliances hereafter sold or offered for sale or installed shall be approved by the Inspector for safety and efficiency, and shall be identified accordingly. In the event the appliance has been used with Butane or other liquid petroleum gases it shall bo approved by Inspector as having been properly converted for use with natural gas. CONVERSIONS FROM BUTId-TE OR OTHER L.P. G,.SES TO N,:TUR.°.L GAS SECTION 17. Conversion of Cu: tourers t Yard Line, House Piping and Appliances from Butane or Other Liquified Petroleum Gases to Natural Gas. Before a natural gas supply is furnished by the gas company to a customer who has been previously using Butane, Propane or other liquified petroleum gases, customer shell secure a permit from the City and an inspection shall be made of the yard line, house piping and appliances by the Inspector, and the follol__v_in� specifications shall be met before a Certificate is issued by the Inspector to con- nect natural gas to the premised: (1) ; yard service line of not less than 111 in size shall be installed in accordance with this ordinance and the gas companyts construction standards. (2) Si.les of house piping shall be altered if need be, so that 11" or larger size pipe shall extend direct from outlet connec- tion of gas company's meter to the first active gas opening. All house piping to additional openings shall be as set out in Section 14 hereof: Construction standards shall be those set out in Section 13 hereof. (3) Before a gas supply is furnished by the supplier, the orifices and/or burners of all liquified petroleum gas appliances shall be changed or altered to the sizes and met-lods-of use recommend- ed by the manufacturer of the appli^nce. Vcnt pipes, heater connec- tions or any other appurtenances to CCs appliances in use prior to conversion from liquid gaU to natural gas shall be altered or replaced in a manner that will conform to the specifications and construction standards of this ordinance. APPLI °.LICE I_A1STj',.LL.;TI0NS SECTION 18. (1) Appliances shall be adequately supported, and so con- nected to the piping as not to exert undue strain on the connection. (2) �Ilppliancos shall be installed so that their continued operation will not create a fire hazard to persons or property. (3) No appliance shall be installed where facilities for ventilation do not permlit the proper combusion of the gas (See Section 20 - Ventilations). (4) Semi-rigid gas tubing may be used to connect appliances, provided it is of adequate capacity cnd approved.. (5) The use of rubber hose is prohibited except when used with laboratory or shop equipment of a portable nature. Such connec- tions shall have the cut-off valve installod at the pipe outlet. M