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Roofing plant expands with Heatec system
Two Heatec 30,000 gallon asphalt storage tanks and hot oil heater. |
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Heatec HC-200 hot oil heater outputs 2 million Btu/hour |
Woodland Industries, Inc. in Griffin, GA is a manufacturer of asphalt roofing felt. Roofing felt is made by saturating rolls of felt with liquid asphalt, then re-rolling the felt after the asphalt cools.
Woodland Industries has produced roofing felt since the early 1980’s. They recently expanded their production capacity. As part of this expansion, they installed a new heating & storage system for liquid asphalt. The system, manufactured by Heatec, includes two vertical asphalt storage tanks, a multi-circuit hot oil heater, unloading & transfer pumps for asphalt, and piping for asphalt & heat transfer oil.
Liquid asphalt in the tanks must be stored at high temperatures in order to keep it in a liquid state. The tanks are heated by heat transfer oil pumped through coils in the bottom of the tanks. The heat transfer oil is heated and circulated by the hot oil heater.
An asphalt unloading pump near a rail spur line allows Woodland’s storage tanks to be filled with asphalt from a rail car. Another pump transfers the liquid asphalt from the storage tanks to processing equipment. All of the piping is insulated to minimize heat loss.
Asphalt unloading pump located near rail spur line. |
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Asphalt transfer pump and controls. |
Each of the tanks is a Heatec Thermo-Guard® TAV-30, with 30,000 gallon storage capacity. The tanks include 6 inches of insulation on the top and sides, as well as 3 inches of insulation on the bottom.
The tanks also feature vent condensers to reduce emissions. Vapors from the heated asphalt are captured and cooled in the vent condensers, then return to the tank in a liquefied state. Radar level gauges monitor the level of asphalt in the tank.
Tanks feature vent condensers to reduce emissions, radar level gauges and a catwalk.
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The hot oil heater is a Heatec HC-200 with an output of 2 million Btu/hour. The heater features two circuits for heat transfer oil. One circuit is dedicated to the two asphalt tanks. The other circuit provides heat to jacketed asphalt piping throughout the facility.
The heater also has a Stackpack™ economizer mounted in its exhaust stack. The economizer uses hot exhaust gases to pre-heat the heat transfer oil before it enters the heater. This reduces the needed output from the heater’s burner, which in turn reduces its fuel consumption and operating cost.
Two existing horizontal asphalt tanks and two asphalt booster heaters are also located at the facility. All were manufactured by Heatec in the early 1980’s and are still in use today.
Heatec HC-200 heater with two independent circuits for heat transfer oil. |
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Stackpack economizer uses hot exhaust gases to pre-heat the heat transfer oil before it enters the heater. |
Heatec Publication 8-07-192
August 10, 2007
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