Attachment 3 - Electrical Heat Trace Specification.pdf

ELECTRICAL HEAT TRACING

Provide heat trace systems for pipes, valves, and fittings that are in accordance with IEEE 515 and be UL listed. System include all necessary components, including heaters and controls to prevent freezing.

Provide self-regulating heaters consisting of two 16 AWG tinned-copper bus wires embedded in parallel in a self-regulating polymer core that varies its power output to respond to temperature along its length.

Ensure heater is able to be crossed over itself without overheating.

Obtain approval before used directly on plastic pipe. Cover heater with a radiation cross-linked modified polyolefin dielectric jacket in accordance with ASTM D2308.

For installation on plastic piping, apply the heater using aluminum tape.

Provide heater with an outer braid of tinned-copper and an outer jacket of modified polyolefin in accordance with ASTM D2308, to provide a good ground path and to enhance the heater's ruggedness.

Provide heater with self-regulating factor of at least 90 percent, in order to provide energy conservation and to prevent overheating.

Operate heater on line voltages of 120 volts without the use of transformers.

Size Heater according to the following table:

Pipe Size

(Inch, Diameter) Minus 10 degrees F Minus 20 degrees F

3 inches or less 5 watts per foot (wpf) 5 wpf

4 inch 5 wpf 8 wpf

6 inch 8 wpf 8 wpf

8 inch 2 strips/5 wpf 2 strips/8 wpf

12 inch 2 strips/8 wpf 2 strips/8 wpf

Control systems by an ambient sensing thermostat set at 40 degrees F either directly or through an appropriate contactor.