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Industrial Process Electric Heaters - Products
Flanged Immersion Heaters
Screw-Plug Heaters
Duct Heaters
Circulation Heaters
Over-the-Side Heaters
Finned Tubular Heaters
Pipe Insert Heaters
Tubular Heaters and Elements
Temperature/Power Control Panels
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Pipe Insert Heaters:
PRODUCT DESCRIPTIONIndirect Heating of TanksIndirect heating uses a heat transfer medium to transfer the heat to the tank. Indirect methods can vary from external heating of the tank using the tank wall as the heating medium to utilizing a heat transfer medium to carry the heat to the tank. In addition, pipe insert heaters have been included in this category because they use an air space between the element and the process to convey the heat. There are various advantages to indirect heating. The biggest advantage is that the heater can typically be serviced without draining the tank. Second, indirect heating often allows watt density exposed to the process fluid to be lowered by spreading the heat over a larger surface. Finally, overheat conditions can be limited in many instances by simply limiting the temperature of the heat transfer medium. There are a few minor disadvantages to indirect heating that may be critical to your process. The primary disadvantage is the thermal lag caused by using a heat transfer medium to carry the heat. The delay is caused by the fact that the heater must first heat the heat transfer medium before the heat transfer medium can heat the process. If there is a large mass of heat transfer medium, larger heating capacities will be required to raise temperatures. ![]() ![]() ![]() ![]()
Heating Using Pipe Insert HeatersA pipe insert heater uses an element
inserted into a sealed pipe. The advantage to the pipe insert heater is that
the element is isolated from the process. This allows the element to be removed
without draining the tank, isolates hazardous or corrosive materials from
deteriorating the element, and if sized properly may allow the heat to be
distributed over a larger surface area reducing the watt density exposed to the
process. Consideration of element expansion both in length and in the element
supports on the inner diameter must be considered when designing a pipe insert
heater. The internal heaters of pipe insert heaters consist of screw plugs,
flanged heaters, or open coil elements (OCE) inserted into a pipe. Pipe insert
heaters must have a separate temperature controller mounted outside of the pipe
to regulate the process temperature. An over temperature device should be
installed and attached to the top of the pipe at the highest point. Packaged
Systems offer a control panel with the necessary switchgear and temperature
controls along with the heaters. The Incoloy sheathed element(s) inside the
pipe are carefully designed for this applicaton, and transfer their heat to the
inside pipe wall by convection and radiation. The large surface area of the
pipe in contact with your liquid greatly reduces the intensity making the pipe
insert heater ideally suited for heating: -Very viscous materials like Bunker C
Fuel Oil Application:Incoloy 800 is used for all pipe insert
heating applications. Maximum sheath temperature 1400ºF. Watt densities of
10-30 W/Sq. in are mainly used. Terminal Enclosures:
Thermostat ApplicationSince the thermostat will be located
inside the pipe, it will be measuring the internal pipe temperature. The
thermostat is intended for high limit purposes and is not suitable for process
control. A separate temperature sensor, like a type J thermocouple will be
required to control the process.
Complete Pipe Insert Heating SystemsScrew
plug and Flanged assemblies are available complete with a pipe when
installation of a pipe into the tank is not feasible or desirable. The pipe
wells are 2 or 2 ½ NPT schedule 40 carbon steel in the standard designs.
Stainless steel pipes and connection fittings are available for chemical
corrosion for or immersion into food products. Installation Instructions
Note: Locate Heater as low as possible for maximum liquid storage capacity. Heat does not move downward.
Warning: Hazard of Shock. Any installation involving electric heaters must be effectively grounded in accordance with the National Electrical Code. Wiring
Operation
Maintenance
WARNING: Hazard of Shock. Disconnect all power to heater before servicing or replacing heaters.
How To Order Pipe Insert HeatersTelephone: 905-859-8225 Facsimile: 905-859-4691 Toll Free: 1-877-674-9744 Our industrial process electric heaters...Our industrial process electric heaters consist of the following product categories: flanged immersion heaters, screw-plug immersion heaters, over-the-side heaters, circulation heaters, duct or air process heaters, pipe insert heaters, tubular heaters , finned tubular heaters and Temperature Control Power Panels. Industrial process heaters are available with adjustable thermostats, digital temperature controls; SCR, mercury relay or mechanical temperature control power panels with process and high limit thermocouples. Industrial process heaters from National Plastic Heater, Sensor and Control Inc. are Hydro approved and CSA or C UL recognized. Terminal enclosures can be NEMA 1 (General Purpose), NEMA 4, ( Moisture resistant) NEMA 4X (Corrosion/Moisture Resistant), NEMA 7 (explosion proof) and NEMA 12 (Dust and Oil Resistant). Industrial heater sheath materials like Titanium, Incoloy, Stainless Steel, Steel, and Copper can be used as required for specific applications. Standard Flanged Immersion Heaters have a 150 lbs flanges but 300, 600 and 1500 lbs flanges are also available. Below a brief description of most of our industrial process heaters line-up: Screw plug immersion heaters consist of hairpin bent tubular elements brazed or welded into a screw plug and provided with terminal boxes for electrical connections. Screw plug immersion heaters are screwed directly through a threaded opening in a tank wall or through matching pipe coupling, half coupling or welding flange. Circulation Heaters offer the following: High efficiency heat transfer, Pressure ratings to 600 lbs, ANSI Standard NPT or ANSI Class 150 connections, Heaters could be screw plug or flanged, Stainless steel construction with Canadian Vessel Registration, Various housing options available NEMA 4, 4X, explosion proof, Suitable for steam, oils, chemicals, gases, corrosive solutions. Over-the-side immersion heaters are designed for vessels where through the side immersion heaters cannot be conveniently installed. These heaters are installed through the top of the vessel with the heated portion of the unit along the side or at the bottom of the tank. NPH Tubular heaters can be used in their straight form or bent into various shapes. Tubular heaters can be used in free air, clamped to a surface, placed inside a groove or cast into metal. Finned tubular heaters offer distinct advantages over open coil heaters: (a) they are safer to operate in that the risk of fire or electrical shock are minimized; (b) they have a much longer service life; and (c) they are more rugged requiring less maintenance than open coil heaters. Duct heaters from National Plastic Heater are composed of, tubular, finned tubular or open coil heating elements that are either flanged or inserted in the duct. Duct air heaters are generally an assembly of tubular heating elements ready to mount into a duct but it can also be an open-coil resistance wire assembly mounted into a duct. Temperature Control Power Panels, for a wide variety of applications are designed and engineered by National Plastic Heater, Sensor and Control Inc. Entire systems are available for the most complex process heating control applications that require electric heaters, temperature controls, and temperature sensors. Control power panels can be built with as little as one zone to as many as 36 or even more temperature control sensing points. |
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