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W fuel Selection The most common fuels are natural gas, vapor propane, and diesel. All fuels tank, distance from the heater to the tank, size of the gas hose or hard pipe, and pressure of the gas. Diesel fueled heater use involves knowing the BTU requirement of the heater, distance between heater and fuel tank, size of fuel tank, type of diesel fuel required (BTUs may vary!), and capacity of heater's fuel pump. Tip: In extremely cold temperatures, place propane tanks in series to create E location, location, location Just as design is critical to determining size, placement is important to efficiency. Heat is easily lost over even the shortest of distances, therefore it is essential to reduce the distance the heat travels prior to entering the tank opening. Two factors help determine how effectively the heater heats the steel surface: air temperature and air movement across the surface. Placing the heater close to the man way, reducing the amount of spiral duct, insulating the duct, creating air movement within the tank, and increasing air changes per hour typically improve the efficiency of a heating system. It may be necessary to engineer a different heating system if you cannot get your equipment close to the tank opening. Tip: If your heater is more than 50 feet (15.24 m) from the tank opening you may need to consider a heater with a reversed incline blower that can provide 4-inch (10.16 cm) static pressure. have different BTU contents and require specific sizing to ensure the heater works properly. When sizing for natural gas it is necessary to know the meter size, gas pressure, distance from meter to heater, BTU requirement, and size of gas hose or hard pipe. For vapor propane, it is necessary to know the prevailing ambient conditions for the job site, BTU requirement of the heater, size of the propane N always be designed with safety in mind. Tip: Ask the supplier for data sheets for the equipment being supplied, and keep this information filed. Sizing the Heater: Determining the correct heater size is critical to maintaining your schedule and satisfying the customer. To size a tank correctly, basic information is required to make the calculations: tank diameter and height, steel temperature requirements, weather data, is there a floater, seals, number of man ways, other equipment being utilized, time of year, coatings utilized, and site logistics. Leaving out any of this information could result in a solution that will not meet the specified conditions for the coating. Incorrect heater sizing could also significantly increase project costs. Make sure the heater vendor uses state-of-theart software when designing the system. Tip: Sizing a heat project can be costly if not done correctly. Check supplier's calculations and have him or her sign off on the work. NEW Advanced model shown Made in U.S.A. 45 Years of Quality 1-800-448-3835 www.defelsko.com DeFelsko Corporation • Ogdensburg, NY +1 ( 315 ) 393-4450 • techsale@defelsko.com Write in Reader Inquiry #34 January 2013 g www.coatingspromag.com 25