To safely heat a special asphalt for corrugated pipe coating in a tank semi-circular in cross-section, 34 feet long, 6 feet wide, with a full capacity of about 12,000 pounds was a particular challenge for this manufacturer. Flame heating was not suitable, because of danger of fire, resulting in possible loss of tank and contents. Also, better temperature control, possible with electric heat, was desirable for several reasons. First, specifications must be closely adhered to, and the use of heat sources other than electricity proved inconsistent, making product control difficult. And asphalt consumption could be more economically controlled - too little heat would cause an unnecessarily thick coating, while over-heated coating would be too thin.

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