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147 ORDINANCE No. 163 SECTION 3 - 5 SAEETY PILOTS: All burners shall be equipped with a name conductivity or flame rectification type of safety pilot or other approved type of safety device. The thermostatic type of pilot will not be permitted. SECTION 3 - 5.1 Safety pilots shall be so designed that upon insertion of pilot after removal for repairs or cleaning, pilot will be in the same position relative to the main burner as when originally installed. The pilot flame shall be in such a position that in the event of a drop in gas pressure, the contact between pilot flame and flame rod or thermocouple shall be broken before the point ,where the pilot flame will fail to reliably ignite the main burner. In the event that this cannot be accomp- lished then the flame rod or thermocouple shall supervise the main burner flame. The flame conductivity or flame rectification type of pilot shall con- sistof a flame rod and pilot burner, flame head (if of~he flame head type), relay, start-stop push button switch, solenoid gas valve for shutting off safety pilot gas as well as gas to the flame pilots, necessary high tension cable, and a positive shut-off gas valve carrying the approval of the Gas Inspector. The safety pilot shall be so arranged as to prevent its being lit unless the main safety valve is in the off position. SECTION 3 - 5.2 All pilot burners shall be supported in such a manner that their position relative to the main burner or burners will remain fixed. SECTION 3 - 5.3 Pilot lines shall be connected to vertical supply lines when possible when horizontal line is used, connection must be made on top or side. Connection must be ahead of all controls including regulator and appliance shut-off and shall be provided with a separate shut-off cock. Where gas pressure is greater than that for which pilots are designed a pressure regulator (pilot regulator) must be installed on the downstream side of pilot line shut-off cock. SECTION 3 - 5.4 A shut-off cock must be installed on branch line to safety pilot and to each branch line to plain pilot system. SECTION 3 - 6 FIRING COCK A manually operated approved shut-off cock shall be installed adjacent to the gas burner on the downstream of all other control valves either manual or automatic. Such cGCk shall be so located that it is readily accassib1e and shall clearly indicate the "onn and "off" positions, or direction of rotation to open or close. This valve or cock must have handle securely attached in such a manner that it may not be readily removed. When gas pressures are greater than 1 psig the cock must be of the lubricated plug type. Gate or globe type valve will not be acceptable.