Hotfoil-EHS Industrial Heating, Welding, and Heat Treating Blog

Industrial Heat Treatment Furnaces, Big and Small

Here at Hotfoil-EHS, we are capable of building furnaces of many sizes, big and small. From small, low-throughput furnaces, to much larger high yield furnaces, to rail-driven furnaces designed to move back and forth over the materials being heated, Hotfoil-EHS Design Engineers and Fabrication Shop has done it all. Gas or electric, Hotfoil-EHS has the experience to build a custom furnace to your exact specification. If you can think it, we can build it!

Hotfoil-EHS
https://hotfoilehs.com
609-588-0900

Indirect Resistance Heating

Indirect resistance heating example:
Weld preheat ceramic mat heater.

With indirect resistance heating, a heating element transfers heat to the material by radiation, convection, or conduction. The element is made of a high- resistance material such as graphite, silicon carbide, or nickel chrome. Heating is usually done in a furnace, with a lining and interior that varies depending on the target material. Typical furnace linings are ceramic, brick, and fiber batting, while furnace interiors can be air, inert gas, or a vacuum.

Indirect resistance heating can also be done with an encased heater, in which the resistive element is encased in an insulator. Called metal sheath heaters this type of heater can be placed directly in liquid to be heated or close to a solid that requires heating. Numerous other types of resistance heating equipment are used throughout industry, including strip heaters, cartridge heaters, and tubular heaters.

Indirect resistance heating example:
Clamp-on pre-weld electric heater.

Resistance heaters that rely on convection as the primary heat transfer method are primarily used for temperatures below 1,250 ̊F. Those that employ radiation are used for higher temperatures, sometimes in vacuum furnaces.

Indirect resistance furnaces are made in a variety of materials and configurations. Some are small enough to fit on a counter top, and others are as large as a freight car. This method of heating can be used in a wide range of applications. Resistance heating applications are precisely controlled, easily automated, and have low maintenance. Because resistance heating is used for so many different types of applications, there are a wide variety of fuel-based process heating systems, as well as steam-based systems, that perform the same operations. In many cases, resistance heating is chosen because of its simplicity and efficiency.

Indirect resistance heating example:
Electric hopper heaters.

Indirect resistance heaters are used for a variety of applications, including heating water, sintering ceramics, heat pressing fabrics, brazing and preheating metal for forging, stress relieving, and sintering. This method is also used to heat liquids, including water, paraffin, acids, and caustic solutions. Applications in the food industry are also common, including keeping oils, fats, and other food products at the proper temperature. Heating is
typically done with immersion heaters, circulation heaters, or band heaters. In the glassmaking industry, indirect resistance provides a means of temperature control. Many hybrid applications also exist, including “boosting” in fuel-fired furnaces to increase production capacity.

Resistance heating applications are precisely controlled, easily automated, and have low maintenance. Because resistance heating is used for so many different types of applications, there are a wide variety of fuel-based process heating systems, as well as steam-based systems, that perform the same operations. In many cases, resistance heating is chosen because of its simplicity and efficiency.

Contact Hotfoil-EHS for any industrial resistance heating project. With decades of application experience, Hotfoil-EHS engineers can help you design a system tailored to your exact needs.

New Hotfoil-EHS UK Ltd. Product Brochure

Hotfoil-EHS UK has just released a new general product capability brochure. You can download the PDF here.

Hotfoil-EHS UK Brochure from Hotfoil EHS, Inc.

Gas Trains and Combustion Systems by Hotfoil-EHS

Hotfoil-EHS manufactures complete gas trains and combustion systems complete with:

Dual ASCO valves for start-up (6 to 10 million BTU systems only)
Air light and air switch
Low-gas and high-gas switch
Gas light
Ignition transformer and ignition light
Burner on light
Dual main gas valves
Strobe light and horns as well as the mute buttons
Proof of Closure Switch
UV Sensor
UV Meter
Re-set button
Veriflame control module
Relays mounted inside a Nema 4 control box
Ramping controller for timing the ramp

https://hotfoilehs.com
609-588-0900

Hotfoil-EHS Heat Treatment Equipment

EHS engineers, designs, and manufactures proven heat treatment systems to effectively complete any project more efficiently than competitive systems, while staying within any budget. Years of application experience and successful installations have produced thousands of happy customers. A focus on customer service second to none.

Job Posting: Sales Associate - Hotfoil-EHS UK

Hotfoil-EHS is a USA based manufacturer of industrial heating systems, heat treatment equipment, and accessories. The company recently opened a facility in Birmingham, England and is looking for a qualified candidate to fill the role of Sales Associate.

For more information about the job, visit this link.

Happy Fourth of July from Hotfoil-EHS

"One flag, one land, one heart, one hand, One Nation evermore!"

Oliver Wendell Holmes