Preheating of oil, where necessary, shall be done by steam, hot water or approved electric heaters. Heaters shall be substantially constructed with all joints made oil tight. Thermometer shall be installed at suitable locations to indicate the temperature of the heated oil. Heaters shall be by-passed or provided with suitable means to prevent abnormal pressure. Positive means must be provided to prevent introduction of oil or other liquid harmful to boiler operations into the boiler.
(Ord. 19, passed 1-7-1955)