Direct-Fired Asphalt Tanks
Direct-Fired Tanks made by CEI provide a traditional solution for heating asphalt. The HSP and HAO series of tanks from CEI are designed specifically for production of asphalt. Tank capacities range from 10,000 gallons to 35,000 gallons. Numerous options are available.
The direct-fired heating system consists of a burner that fires into a large combustion chamber inside the bottom of the tank. The combustion chamber is lined with refractory material for longer life.
Direct-fired tanks use an 800,000 Btu on/off burner. The standard burner uses No. 2 fuel oil. However, burners are also available for gas, LP or combination gas/oil.
The deluxe HAO tank has two secondary heating tubes that connect to the far end of the combustion chamber. They double back inside the tank and connect to two exhaust stacks that exit through the top of the tank. The secondary tubes significantly increase the amount of heating surface area in contact with the asphalt. They enable the heating system to easily outperform other direct-fired tanks on the market.
The economy HSP tank lacks the secondary heating tubes. A single exhaust stack connects to the far end of the combustion chamber. Although it is not as efficient as our deluxe tanks, its efficiency is comparable to other units on the market.
Available optionally, scavenger coils are similar to the heating coils in our coil-heated asphalt tanks. Heat transfer oil circulates through the coils, and is heated by the hot asphalt stored in the tank. The heated oil can then be used to heat other plant components such as jacketed asphalt lines, asphalt meters, unloading pumps, etc.
Burner and safety limit controls are mounted in a control panel that is UL listed and meets NEMA 4 requirements. The panel protects against windblown dust and rain, splashing water and hose-directed water.
The burner management system uses a microprocessor to manage the burner controls and provide proper burner sequencing, ignition and flame monitoring protection. Readouts and signal lights on the face of the control panel indicate the current burner status and its operating history. If a problem occurs that causes the burner to shut down, the lights identify all switches affected by the shutdown. You can normally tell from the lights which limit switches tripped first, setting off the chain reaction that caused the shutdown.
The controls also include an asphalt high temperature backup controller and alarm switches for low and high asphalt levels. An asphalt level float gauge is also included.
Available options for direct-fired tanks include:
- 300 gallon fuel tank
- Asphalt metering system
- 4' rear frame extension with cable rack & step
- 6-inch insulation
- Scavenger coils & hot oil piping
Tanks are made from 1/4” A-36 steel plate. Tank heads are also 1/4” steel, flanged and reinforced with channel stiffeners. Ladders are provided both inside and out. Tanks are covered with 6 inches of fiberglass insulation, and the same options of aluminum skin as vertical tanks.
Internal bulkheads are optional for coil-heated tanks. These bulkheads divide the storage tank into separate compartments for different grades or types of asphalt, heavy fuel, or additives. The bulkheads are double-walled and insulated. Various combinations of heating coils and controls can be furnished. Optional electric heating elements are also available.
Special Versions for Modified Asphalt
Two special versions of portable tanks are available to heat and store either polymer-modified asphalt or asphalt-rubber mixtures. Both versions maintain the modified asphalt at higher than normal temperatures, and constantly agitate the material. Pump and piping systems are oversized because modified asphalt has a higher viscosity than virgin asphalt. Motor-driven mixers, agitators, or augers are mounted in the tank and spaced for optimum agitation.
Optional steel plate foundations with hand cranks make setup easy. They can be cranked down in minutes, drastically reducing setup time and eliminating the need for cribbing. Screw type support level jacks with 30” x 30” plates are also available.
Fuel Tank Options
A 350-gallon compartment can be built on or in the gooseneck for storage of No. 2 fuel oil for the heater.
Additive Tank Options
A 2,000 gallon additive tank can be built onto the rear frame extension. It is heated and insulated.
Metering System Options
Highly-accurate twin-pump asphalt meters and mass-flow meters can be added. Meters are typically mounted on a frame extension on the back of the tank
Unloading Pump Options
An optional pump, motor, and strainer system unloads AC tankers into the tank. The system can be piped so it also unloads the tank. A reversing starter can be used to clear the piping.
A variety of piping options are available:
- Piping sizes from 2 to 4 inches
- AC lines with hot oil jackets
- Rigid AC lines with 12° ball joints
- Insulation on hot oil and AC lines
- Piping to drum mixer and other tanks
- 1-1/2” hot oil jumper lines
Other options include a calibration tank for calibrating the asphalt metering system, a sock filter to clean debris from heat transfer oil and protect hot oil pumps, a 7-day, 24-hour time clock, fold-down handrails, vent condensers, and high-low AC level alarm.