Tubular Heating Elements | Straight & Formed ...

07, Oct. 2024

 

Tubular Heating Elements | Straight & Formed ...

Highly versatile and economical, electric tubular heating elements are applied in virtually every conceivable type of heating application. These robust tubular heaters are a reliable thermal source used to heat a multitude of liquids, gases, and solids and can be applied straight or formed into complex formations.

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Durex manufactured tubular heaters are also used for radiant heating in open air or vacuum atmospheres. The heating elements can be cast into or clamped onto metal to form heated parts. We offer a wide selection of standard designs, or tubular heating elements can be custom designed for your requirements. Durex Industries' application and design engineering team are available to assist in specifying the proper electric tubular heater configuration.

Tubular Heating Element Design Features

  • Capable of 600V or higher in specific applications
  • Can be factory pre-formed or field formed with proper tooling
  • Heavy wall construction is available for high-pressure and high corrosion applications
  • Diameters available from 0.26 to 0.496 to suit individual applications
  • Low Watt Copper, Steel or high alloy sheath materials to mitigate corrosion
  • High temperature capability of °F+
  • Precision helical wound nickel-chromium resistance wire provides uniform thermal profile
  • Circumferential cold pin-to-wire fusion weld ensures robust connection for long heater life
  • Compacted, high purity MgO dielectric insulation extends resistance wire life at high temperatures
  • Recompacted bends provide longer life by ensuring insulation integrity
  • UL & CSA recognized elements assures safe and reliable performance
  • Precision intricate forming
  • High-temperature moisture seals
  • Helium leak, electrical, and X-ray testing

Straight Heating Elements

Durex manufactures standard tubular heating elements for any application. Tubular heating elements are a versatile and economical heat source for a wide variety of industrial and commercial applications. Standard diameters are 0.260", 0.315", 0.375", 0.430", 0.475" and 0.496". Other special sizes are available. Depending on the diameter, lengths can be supplied up to 335". Standard sheath materials range from copper and steel to stainless steel tubular heaters and Incoloy® alloys. Special sheath materials may be available based on diameter and size of the element required. Standard terminations include a threaded stud, threaded bulkhead, screw lug, quick disconnect spade, ceramic-to-metal hermetic, molded rubber lead, conventional lead wire terminal assembly and more. Flexible lead wire extensions or other mounting options are available for specific applications.

Formed Heating Elements

Custom heating elements can be provided to any length, formed into virtually any configuration and sheathed in a variety of different materials to suit your application. Likewise, the connection/termination possibilities are limited only by your imagination and the availability of components. Standard terminations include a threaded stud, threaded bulkhead, screw lug, quick disconnect spade, ceramic-to-metal hermetic, molded rubber lead, conventional lead wire terminal assembly and more. Durex frequently fabricates custom tubular heaters in conjunction with an OEM's design staff, both for prototype and production.

Considerations when Selecting Tubular Heaters

When choosing which tubular heating element is right for your application, there are several factors one should consider before making a decision. Factors include:

  • Electrical termination type
  • Temperature control

  • Voltage and wattage rating
  • Installation and mounting requirements (brackets, fittings, etc.)
  • Forming and bending requirements
  • Operating temperature
  • Corrosive environment and effects on the heater

Contact the Tubular Heating Experts at Durex Industries Today

At Durex Industries, we look forward to new designs and challenges. We have extensive experience applying tubular heating elements in challenging applications from cryogenic temperatures to over °F, from low or high-power densities, from benign or highly corrosive environments. Lets get started on your next tubular heater element project today.

Applications of Tubular Heating Elements | Industrial Heating

Tubular heating elements are commonly used in industrial heating due to their versatility and affordability. They are used for heating liquids, solids and gases through conduction, convection, and radiation heating. Capable of reaching high temperatures, tubular heaters are an efficient choice for heavy duty industrial applications.

What Are Tubular Heating Elements

Tubular heating elements are elements used for electric heaters. They are highly customizable, energy efficient and can be used for most heating applications. They can be made to just about any shape most commonly round, triangular or flattened.

How Do Tubular Heating Elements Work

Tubular heating elements transfer heat through direct exposure to a liquid, solid, or gas. They are configured to a specific watt density, size, shapes, and sheath based on their specific application. They can reach temperatures of 750 degrees centigrade or higher when configured properly.

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Tubular Heating Element Applications

Tubular heating elements are applied for three main types of industrial heating, conduction, convection, and radiation heating.

Industrial Conduction Heating

Transfer of heat using tubulars is very important when designing a heating system. Heat transfer from the outer sheath of the tubular element must travel to the areas of interest in its application. The alloy of the sheath is important. This is because different alloys take on different properties for heat transfer. For example, steel is an excellent heat transfer material compared to stainless.

Industrial Convection Heating

With convection heating, the tubular element heats the air around. Then, natural convection currents transfer the heat to the intended medium. Tubular elements are able to dissipate heat extremely fast. This allows for the convection to heat the target product quickly. Convection allows for quicker heat penetration. Convection heaters dont use fans or motors. As such, they are quiet and are low maintenance. They can be used by themselves to heat a small space or in series for a larger space. Convection heaters allow for the heating of specific or isolated areas, which makes them an energy efficient choice.

Industrial Radiation Heating

Industrial radiation heating generates heat and radiates it over a certain area. The distance and angle of the supporting bracket inform the design. Placing reflectors at specific angles efficiently directs the heat where it is needed. In industrial radiation heating, tubular elements are often preferred over quartz elements.  This is due to their rigidity, and durability. Wattco uses Calrod tubular heaters for producing radiant heat in an application due to their versatility and quick heat up times. Radiation heating is commonly used in the medical, automotive, mining/oil/gas, construction, manufacturing, and thermoforming industries.

What Mediums Can Tubular Heating Elements Be Used For?

Tubular heating elements can be used for heating a variety of mediums including liquids, gases, and solids. Tubular heating elements in conduction heaters use direct contact for heating solids. In convection heating, elements transfer heat between a surface and a gas or liquid. In radiation heating, thermal energy is transferred by electromagnetic waves.

Types of Tubular Heating Elements

There are a number of types of tubular heating elements. All of them can be customized to meet almost any requirement. Singular tubular elements use a mineral insulated alloy sheath. This prevents splashing and vibration to allow for a longer service life. A double tubular element is two series wired heating elements in reflection. Hairpin tubular elements can come with moisture resistant terminal housing if used in a moist environment. Quartz tubing, double quartz tube, and quartz lamp elements are used for horizontal mounting of tube fixtures. Finned tubular heaters are used for ultimate efficiency and for humid or corrosive operating elements.

Advantages of Tubular Heaters

Precision

Precision is one of the main advantages of tubular heating elements. They allow for advanced temperature controls, better temperature maintenance, and precise heat transfer. Watt densities up to 120 WPSI are available and temperatures up to 750°C (1,382°F) can be reached. They have the flexibility to meet just about any application. The cold sections are also custom made to protect the terminals.   Extreme precision allows tubular heating elements to perform better and last longer. As a result, they are economical and efficient.

Compact Size

The compact size of tubular heating elements holds many advantages. Their smaller, and custom sizes make for easy installation. Their size also makes them easy to clean, maintain or replace. The ability to easily remove and replace these elements means that the production period does not have to be paused for long.

Custom

Tubular heating elements are available in different shapes and sizes, designed for optimal durability. The elements are factory-configured to the optimal size and shape for the specific application. Custom bending of diameters and radiuses allow for better performance by meeting the form, fit and functions of applications.

Get Tubular Heating Elements Today

Tubular heating elements are among the most popular industrial heating products. They are efficient, durable, and cost-effective. Contact us today to request a proposal or more information. Our team will help you customize the best tubular heating elements for your application.

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