Heater Catalog - Watlow

Tubular HeatersFIREBAR Single/Double-Ended HeatersTechnical DataThe FIREBAR Heater Oil Test graph compares sheathtemperatures of 40 W/in 2 (6.7 W/cm 2 ) flat and roundtubular elements. The FIREBAR element consistentlyoperates at a lower sheath temperature than the roundtubular element, even when light oils are tested atdifferent temperatures. This reduces the chance thatcoking and fluid degradation will occur.In fact, the FIREBAR element’s sheath temperatureat 40 W/in 2 (6.7 W/cm 2 ) is lower than a 30 W/in 2(4.6 W/cm 2 ) round tubular element.Sheath Temperature—°F700650600550500450FIREBAR Heater Oil TestOil Temperature—°C75 100 125 150 175 200 225 25040 W/in 2 (6.2 W/cm 2 )30 W/in 2 (4.7 W/cm 2 )40 W/in 2 (6.2 W/cm 2 )30 W/in 2 (4.7 W/cm 2 )350325300275250225Sheath Temperature—°C4003501 Inch FIREBAR Heater0.430 Inch Round Tubular200175300150150 200 250 300 350 400 450 500Oil Temperature—°FHeater Size and PowerThe Heater Size Comparison chart shows, at the samewattage and watt density, the FIREBAR element is38 percent shorter than a 0.430 in. (11 mm) roundtubular element. The FIREBAR element requires lessspace in application and equipment designs.Heater Size ComparisonHeated LengthElement in. (mm) Wattage W/in 2 (W/cm 2 )1 in. FIREBAR Element 19 7 /8 (504.8) 1000 23 (3.6)0.430 in. RoundTubular Element 32 1 /4 (819.0) 1000 23 (3.6)The Heater Power Comparison chart demonstrates equalwatt density, element length and increased total wattagefor the FIREBAR element. The power in the FIREBARelement is 70 percent greater.Heater Power ComparisonHeated LengthElement in. (mm) Wattage W/in 2 (W/cm 2 )1 in. FIREBAR Element 32 1 /4 (819.0) 1700 23 (3.6)0.430 in. RoundTubular Element 32 1 /4 (819.0) 1000 23 (3.6)98 WATLOW ®