Wednesday, September 30, 2015

Epoxy Laminated Panels for Industrial Tank Heating

epoxy laminated heater
Epoxy laminated heater for tanks
Need a way to maintain process temperature for a holding tank? Looking for something easy to install and connect? Consider an epoxy laminated electric heating panel.

These heaters use a flat foil resistive element which is laminated in a multi-layer fiberglass construction using epoxy resin. The manufacturing process is done under tightly controlled heat and pressure to assure bonding and structural integrity.  The resulting electric heater design is a semi-flexible panel that is waterproof and durable.

Epoxy laminated panel (ELPs) are a very versatile option for tank heating. ELP heating panels can be used in a variety of applications from freeze protection to process heating with exposure temperatures ranging from -40 F to +212 F. ELP heating panels can be used on either vertical or horizontal tanks with diameters of 48" and above, with either metallic or non-metallic construction. They can also be used in dry, wet, or corrosive environments, as well as for hazardous and non-hazardous areas. 

epoxy laminated heater
Installed view of epoxy laminated heater.
They are quick and easy to install and require no special tools or skills. Heaters are usually installed by banding them to the tank with metal bands or polyester straps, which takes only a matter of minutes. After installing the heating panels, adhesive aluminum tape should be applied to the edges of the heaters acting as a seal. This will prevent thermal insulation becoming trapped between the heating panels and the tank.

The heaters provide a low watt density heating profile, and along with their inherent low mass,  ELPs provide excellent thermodynamic performance. 

For more information contact:

HotfoilEHS
2960 East State Street Ext.
Hamilton, NJ 08619
Phone # 609.588.0900
Fax # 609.588.8333
www.hotfoilehs.com
Email: dap@hotfoilehs.com

Monday, September 21, 2015

Ceramic Mat Heaters for Pre & Post Weld Heat Treating

ceramic mat heater
Ceramic mat heater
for pre and post weld
heat treatment.
Flexible ceramic mat heaters (also known as flexible ceramic pads or FCPs) are designed to provide stress relief for pre and post weld heat treatments for large scale welding requirements, such as those needed for piping fabrication, boilers, pressure vessels, storage tanks, pipeline construction, and mining equipment.

It's very important to pre-heat metal to a specific temperature prior to welding. Pre-heating metals reduces stress in the finished weld,  as well as eliminates moisture and improves the metallic microstructure of the weld material.  For post weld heat treatment (PWHT), use of resistance heaters to apply carefully controlled  cool-down can significantly increase the cross-weld toughness of the heat-affected zone.

Ceramic mat heaters are manufactured using high grade nickel chrome (NiCr) 80/20 wire insulated with interlocking sintered alumina ceramic beads, providing flexibility and convenience for use on curved or flat surfaces. Their design also allows for good contact and high heat transfer. Ceramic mat heaters are intended for repeated use and have considerable mechanical strength and durability. They are capable of achieving temperatures of up to 2050°F.  and are most often are supplied with ceramic insulated leads with either Camlock or Dinse type welder terminations.

The most common voltages used are 40, 60, and 80 volts (as supplied by arc welders) but many custom voltages are available. Special sizes, heating patterns and terminations are also easily accommodated with ceramic mat heaters.

For more information, contact:
Hotfoil-EHS, Inc.
2960 East State Street Ext.
Hamilton, NJ 08619
Phone # 609.588.0900
Fax # 609.588.8333
Email: dap@hotfoilehs.com

Saturday, September 5, 2015

Demand Pulse MIG Welding

Demand Pulse MIG Welder
Demand Pulse MIG Welder
(courtesy of Aftek-EHS)

Demand Pulse is possible because of the MOSFET, an extremely fast electronic switch. Using constant current DC power, a wire is fed into the arc zone. As the wire approaches the work, the voltage drops as a function of the arc length. At a pre-selected arc voltage (usually 15 volts), the MOSFET fire a pulse of current to expel the tip of the wire across the arc gap. This current is supplied by means of a parallel resistor in the main current control circuit and is generally 100 amps. Switching time is measured in nanoseconds, and the total cycle time is very short, perhaps 15 nanoseconds. An inductor is not required, nor desired, since fast switching is essential. Perfectly tuned, the pulse cycles 200 times per second or slightly less.

The arc looks and sounds like “short-arc”, but a close look will show that there is no short-circuit. The arc length is from .020” to .090”, very short compared to GMAW-P done with conventional machines. This short arc length, combined with the short duration of the pulse, and the low current required to effect transfer gives a total arc “heat” far below that of either short-circuit transfer, or conventional GMAW-P. Fusion is excellent, because the arc never goes “out”.

Below is a demo video using this technology on 18 gauge stainless steel, without any burn through.

For more information contact:

2960 East State Street Ext.
Hamilton, NJ 08619
Phone # 609.588.0900
Fax # 609.588.8333
Email: dap@hotfoilehs.com

Electric Heating Systems for Power Generation Baghouse and Precipitator Hoppers

Pluggage of flyash collection hoppers due to flue condensation is an expensive and unnecessary problem. Type HB Heating Module systems are specifically designed to eliminate the maintenance nightmare of hopper pluggage.

The HB Heating Module system is designed to provide low watt density heat spread over the maximum surface area available for heating. Uniform heating is essential to avoid cold spots, especially near the hopper throat where fly ash pluggage is most prevalent and problematic. To obtain maximum heater coverage, both rectangular and trapezoidal heaters are available to provide the most effective and efficient application of heat.

Most flyash hoppers are designed with poke tubes, manways, and cylindrical throats. As supplemental equipment we can include custom built flexible heating blankets for these problem areas which become integrated with the HB Module system to provide the ultimate in uniform heat distribution.


Welcome to Our Industrial Heating, Welding and Weld Pre-heating Blog

Hotfoil-EHS is committed to educating and training users of our products, namely electric hopper heating systems, electric pre and post weld heat treating, heat treating furnaces, and multi-operator welding stations.

In future posts, we hope to provide interesting information for a wide variety of applications, performance, and products for the markets we serve.

Here is a breakdown of those markets and products:

HOTFOIL
Coal and Fly Ash Hopper Heaters, Industrial Tank Heaters, Heating Cable, Silicone Heater Blankets, Control Systems.

EHS
Pre & Post Weld Heat Treating Power Consoles, Ceramic Mat Heaters, TAU Units, Temperature Recorders, Cable Sets, Brinell Testers.

AFTEK-EHS
Multi-Operator Power Supplies, Packaged Welding Systems, Single Operator Welders, GRID Systems, Custom Transformers.