Tempco Finned Tubular Heaters
Finned heaters are constructed using Tempco’s robust tubular element as the basis of construction. Fin material is continuously spiral wound tightly onto the element surface to increase the convective surface area for air and non-corrosive gas heating. Fin spacing and size have been tested and selected to optimize performance. Steel finned units are then furnace brazed, bonding the fins to the sheath to increase conductive efficiency. This allows higher wattage levels to be achieved in the same flow area and produces lower sheath temperatures prolonging heater life. For higher temperature or more corrosive applications, stainless steel fins securely wound on alloy sheath are available. Application conditions such as vibration and toxic/flammable media should be taken into consideration when installing heaters. Protective coatings are available for use on steel finned heaters for mildly corrosive or high humidity applications.
Finned tubular elements are safer to operate than open coil heaters as the risk of fire from combustible particles in the flow stream and electrical shock is minimized. Increased service life and less maintenance required due to the rugged finned element construction. Power loading (w/in) of finned tubulars can be matched to any open coil installation.
Eagle Sensors & Controls, Division of Excel Automation LLC, is an authorized Tempco distributor. Contact us for sales & technical support for Tempco heaters, Tempco sensors, Tempco temperature controllers, Tempco process heating systems & all other Tempco products.
Finned Outside Diameter
.315″ dia. With 5/16″ fins
Outside Diameter: 92” OD
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
.315″ dia. With 3/8″ fins
Outside Diameter: 1.05” OD
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
.375″ dia. With 5/16″ fins
Outside Diameter: 98” OD
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
.375″ dia. With 3/8″ fins
Outside Diameter: 1.11” OD
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
.430″ dia. With 5/16″ fins
Outside Diameter: 1.04” OD
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
.430″ dia. With 3/8″ fins
Outside Diameter: steel fins—1.15”, SS fins 1.16”
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
.475″ dia. With 3/8″ fins
Outside Diameter: 1.21” OD
Fin Pitch Standards: 5±.5 for 5/16 material, 4.5-5 for 3/8 material (up to 6 per inch maximum
Sheath Materials
Incoloy 840
Nickel 18-20%, Chromium 18-22%, Iron balance.
Has about 10% less nickel than Incoloy 800. Used in many air heating applications, where it has exhibited superior oxidation resistance at less cost than Incoloy 800.
Incoloy 800
Nickel 30-35%, Chromium 19-23%, Iron balance.
The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating and immersion
heating of potable water and other liquids.
316/316L Stainless Steel
Chromium 16-18%, Nickel 11-14%, Iron balance.
(316L – Low Carbon)
Modified with the addition of Molybdenum (2-3%) to improve corrosion resistance in certain environments, especially those which would tend to cause pitting due to the presence of chlorides. Applications include deionized water.
Maximum Sheath Temperature: 1200°F / 649°C
304/304L Stainless Steel
Chromium 18-20%, Nickel 8-11%, Iron balance.
(304L – Low Carbon)
Used in the food industry, medical, and chemical heating.
Maximum Sheath Temperature: 1200°F (649°C)
Steel
Low Carbon
Used for high to low viscosity oils, asphalt, tar, wax, molten salt, heat transfer liquid media and other compatible solutions.
Mounting Options
Type B – Bulkhead Fittings
Bulkhead fittings provide a leakproof method for mounting tubular heating elements through tank walls. Standard are round brass fittings crimped onto the element that are suitable for low pressure water (up to 80 psig) and non-pressure air. A brass hex nut, plated steel washer and gasket are supplied as standard.
Type MC – Mounting Collar
Plated steel mounPlated steel mounting collars are locked in place with a set-screw and serve as an adjustable stop for through-the-wall mounting. Collars are shipped in bulk unless otherwise specified. Mounting collars can be ordered with the heater or purchased separately.ting collars are locked in place with a set-screw and serve as an adjustable stop for through-the-wall mounting.
Type LR – Locator Washer
Locator washers are permanently attached to the heater sheath by staking/crimping and are used to limit the movement of the heater while allowing for expansion and contraction of the heater sheath.
Type MF – Mounting Bracket
An economical way to mount the heater in non-pressurizing, non-liquid applications.
Fin Materials
Steel Fins
Steel wound with copper wire between fins for oven brazing to sheath.
Fin Strip Width: 5/16” on .315, .375 and .430 diameters 3/8” on .315, .375 .430 and .475 diameters
Fin Thickness: 26 Ga. (.018); Optional 24 Ga. (.024)
Stainless Steel Fins
Stainless steel is mechanically wound but can be oven brazed as an option if a bright annealing atmosphere is used.
Fin Strip Width: 5/16” on .315, .375 and .430 diameters 3/8” on .315, .375 .430 and .475 diameters Fin Thickness (304SS): 26 Ga. (.018)
Surface Treatments
Oven Brazed & Annealed
This process produces a thin oxide coating on the fins & sheath. The copper braze material provides a further benefit by coating portions of the sheath. Suitable for most clean air applications containing low to moderate amounts of organic VOC’s and moisture.
High Heat Aluminum painted
High heat Aluminum paint available for steel finned units is suitable for use up to 700⁰F. It has good moisture resistance and provides the heater with a rust protective coating for ambient air applications containing organic or non-corrosive VOC’s. Recommended for use in most air duct applications.
High heat flat black painted surface
This is a high temperature, high emissivity, flat black coating which protects steel finned heater surfaces from oxidation while acting as a blackbody emitter. Usable up to 1000⁰F, it provides a radiant surface for free convection & low velocity convective applications.
Nickel plated steel finish
Nickel plated finish is available to provide the highest possible corrosion protection on steel finned heaters. Usable up to 500⁰F for salt water marine applications, air containing high concentrations of organic VOC’s, flue gas residues, ammonia, and many other chemical vapors. Please contact Tempco with your specific application requirements.
Bright Annealing
Bright annealed steel or stainless steel finned heaters produce a smooth bright finish. For applications requiring a clean un-oxidized surface with no rust or other contamination. Stainless finned heaters can be used in applications at higher temperatures and where moderate to high concentrations of organic or non-corrosive vapors are present.
Electrical Terminations
Type T – Stud Terminal
Threaded stud terminal with ceramic insulator.
Type TM – Stud with Mica Insulator
Threaded stud terminal with mica insulator.
Type P – Plain Pin
Plain terminal pin. Specify Length “L.”
Standard 1/2″ (12.7 mm) pin length.
Type SF – Quick Connect Straight
1/4″ male (3/16″ optional) quick connect (slip-on) terminals are welded to the element terminal pin straight.
They provide quick and easy installation of lead wire with excellent holding force. Specify if an optional mica or ceramic insulator is required. Material: Nickel-Plated Steel.
Type SF9 – Quick Connect 90°
1/4″ male (3/16″ optional) quick connect (slip-on) terminals are welded to the element terminal pin at 90° to the sheath.
They provide quick and easy installation of lead wire with excellent holding force. Specify if an optional mica or ceramic insulator is required. Material: Nickel-Plated Steel.
Type L – Terminal Lug
A nickel-plated steel lug is projection welded to the terminal pin straight.
Standard LA, 10-32 screw
Optional LB, 8-32 screw
Type L9 – Terminal Lug 90°
A nickel-plated steel lug is projection welded to the terminal pin at 90° to the sheath).Standard L9A, 10-32 screw
Optional L9B, 8-32 screw
Type E – Terminal Lug Right Angle
Type E1A 8-32 screw with mica insulator (Standard)
Type E1B 8-32 screw with ceramic insulator
Type E2A 10-32 screw with mica insulator
Type E2B 10-32 screw with ceramic insulator
Type A – Right Angle Terminal
For use when space is tight.
Type F1 – Lead Wire
Type F1A 250°C (482°F) TGGT insulation
Type F1B 450°C (842°F) MGT insulation
Type F1C 200°C (392°F) Teflon® insulation
Type F1D 150°C (302°F) Silicone Rubber insulation
Type F1E 105°C (221°F) Thermoplastic (PVC) insulation
Termination Options
Type R1 – Flexible Armor Cable
Type R1A Galvanized cable
Type R1B Stainless steel cable
Provides excellent protection to lead wires in abrasive environments.
Standard 10″ (254 mm) armor cable over 12″ (305 mm) leads.
Type W1 – Stainless Steel Wire Braid
Provides good protection to lead wires where flexibility is needed.
Standard 10″ (254 mm) braid over 12″ (305 mm) leads.
Moisture Seals
Type SS – Silicone Resin Seal
A brushed-on coating that penetrates the MgO, offering economical moisture protection under humid storage conditions./
Type SER – RTV Seal
RTV (room temperature vulcanizing) silicone rubber adhesive sealant provides a good moisture seal.
Type SHE – Epoxy Resin Seal
Epoxy resin provides a moisture resisting barrier.