Terms and definitions for EHT system (Part-II)

 1.18 Rated Output: 

Power per unit length or unit surface area of a trace heating device, at rated voltage, temperature, and length or area.

1.19 Rated Voltage: 

Voltage assigned by the manufacturer to which operating and performance characteristics of trace heating devices are referred.

1.20 Start-up Current: 

Current response of a trace heater following energization or power on.

1.21 Runaway Pipe Temperature: 

The highest equilibrium pipe temperature that occurs when the trace heating device is continuously energized at the maximum ambient temperature.

 

1.22 Sheath: 

A uniform and continuous metallic or non-metallic covering enclosing components of the trace heating device to provide protection against influence from the surroundings (e.g., corrosion, moisture, abrasion).

 

1.23 Sheath Temperature: 

The temperature of the outermost continuous covering of a trace heater or surface heater that may be exposed to the surrounding atmosphere.

1.24 Series trace heater: 

A device of linear geometry designed for the purpose of producing heat on the principle of electrical resistance, with its heating element electrically connected in series, with a single current path and with a specific resistance at a given temperature for a given length.

1.25 Stabilized Design: 

Design where the temperature of the trace heating device, by design and use, stabilizes below the high limit temperature, under the most unfavorable conditions, without the need for a protective system to limit the temperature.

1.26 Temperature Control Device: 

A device that serves to maintain the temperature within a specified temperature range.

1.27 Temperature Controller: 

A device or combination of devices incorporating a means of sensing temperature and of controlling the power to the trace heater.

1.28 Temperature Sensor: 

A device that responds to temperature and provides an electrical signal or mechanical operation.

1.29 Weather Barrier (cladding): 

Material that, when installed on the outer surface of thermal insulation, protects the thermal insulation from water or other liquids; from physical damage caused by ice pellets, wind, or mechanical abuse; and from deterioration caused by solar radiation or atmospheric contamination.

1.30 Workpiece: 

Object to which the trace heating device is applied, such as piping, vessels, tanks, valves, instruments, and similar equipment.

Note:-

All Terms and definitions for EHT system (Part-I & II) as per IEEE515.