Parallel resistance heating cables that will reduce their power output as temperatures rise but do not have the high in-rush currents associated with self-regulating heating cables.
These cables are capable of delivering high watt per foot heat outputs.
Series resistance cables are single or multiple metal alloy conductors with a voltage applied at the ends.
The power output is a function of the voltage applied and the overall resistance based on type of metal alloy and circuit length. If the length changes the power output of the cable changes, so these heating cables are not considered “cut-to-length”.
Both self-regulation and power-limiting cables exhibit a PTC (positive temperature coefficient) resistance characteristic and subsequently power output decreases with increasing temperature.
As self-regulating heating cables increase in temperature they eventually reach a “shut-off” temperature.
Power-limiting cables provide higher power output at higher temperatures; however, as temperature increases power-limiting cables do reach a “shut-off” temperature.
Yes. Pipe support (non-insulated) and valves represent a region of much higher heat loss. This local higher heat loss must be made up with additional heating cable.
There are important considerations when designing heat tracing for non-metallic pipes and vessels.
It is very important to consider the maximum temperature rating of the pipe or vessel material.
The heater cable operating temperature (sheath temperature) must not exceed the maximum temperature rating of the pipe or vessel. In most cases, the maximum operating temperature is calculated during runaway conditions.
Runaway conditions are typically calculated...
This depends on the temperature control requirements of the application. If tight, temperature control is required within a few degrees, a line sensing device is recommended.
For freeze protection applications , ambient sensing is commonly used with self-regulating heating cables. The self-regulating effect reduces the resulting equilibrium pipe temperature during operation.
Where the ambient change during the year is small, it may be possible to do a design using a self-...
In a process plant, a pipeline is a length of pipe having valves, pumps or other line equipment attached to transport and control the flow of process, service or utilities materials.
Typically, process piping transports fluids from process feed tanks to the plant’s process units then carries the processed material to storage tanks.
Service piping transports water, brine, steam, air or other substances to process piping or equipment to bring about the successful completion of the...
The heat energy detectable in matter is due to the motion of molecules. The molecules move rapidly in an object that is warm. When the object cools down, the molecules slow down. This is known as the Kinetic Theory of Heat.
Heat flows between two objects because of a difference in temperature between them. When two objects are brought together, the molecules of the warm object imparts motion to the molecules of the cooler object.
In measuring heat, there are two properties to be considered: the “intensity” of the heat and the “quantity” of heat.
The intensity of heat is denoted by the term “Temperature” and is known as sensible heat because the heat can be sensed by the thermometer or by the sense of human touch. The quantity of heat in a substance is measured in Kilojoules in the Metric system and BTU’s in the Inch-Pound system.
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Good day. Please quote on heating wires for a freezer room (-30 deg.C)
Heating wires to...