Unique Three-Heater System Provides Best Environment For High Temperature Heating of Nitrogen Problem: The customer needed to heat nitrogen gas from a 10°C (50°F) inlet temperature to a final outlet temperature of 760°C(1400°F) -- an increase of 750°C ( 1,350°F). An operating pressure of 100 PSIG (16.6 kPa) and flow rate of 0.105 to 0.15 pounds (0.048 to 0.068 kg) per second were also required. Due to the environment of the heating, Division 2 hazardous location safety requirements had to be met, as wells as ASME specifications. Solution: Because of the heat characteristics of gas, Watlow designed a circulation system with three separate heaters. To provide maximum watt densities and keep costs to a minimum, Watlow separated the 65 kW of electricity needed into three separate piped-in seri

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