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MARATHONHEATER

AIR HEATERS

THERMOCOUPLES & RTDsBAND & STRIP HEATERS

Coil Heaters

Air Heaters

Thermocouples & RTDs

HotRod Cartridge Heaters

Silicon Rubber Heaters

Mica Band & Strip Heaters

Other

Products

Tubular Heaters

Engineered Solutions for Heating & Sensing

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Tubular elements are the most versatile of all metal sheathed heaters. They can be supplied in many lengths, diameters, sheath materials and electrical ratings.

Diameter(mm)

Sheath MaterialsAvailable

MaximumVoltage

MaximumAmperage

Maximum Length (mm)

Minimum Factory Bend Radius (mm)

Minimum Field Bend Radius (mm)

5.08

6.60

8.00

8.38

10.92

12.06

Incoloy

Steel, Incoloy

Steel, 316 SS, Incoloy

Steel, 316 SS, Incoloy

Steel, 304 SS, 316 SS IncoloySteel, 304 SS,

316 SS Incoloy

240

250

480

480

600

600

12

15

30

30

40

40

2500

4500

6000

6000

6000

6000

6.35

7.93

9.52

9.52

11.11

12.7

19.05

31.75

25.4

31.75

34.92

34.92

SP

EC

IFIC

AT

ION

Material BeingHeated

Maximum Recommended Watt Density

RecommendedSheath Material

Air to 750°F

Air to 1200°F

Air to 1600°F

Tap Water

Distilled Water

Deionized Water

Hot Runner Molds(Manifolds)Light Oils, Greases, Heat Transfer FluidsMedium WeightOils

Heavy Weight Oils

Caustic Solutions

30

40

40

60

60

60

60

15

8

23

23

Steel

304 SS or 316 SS

Incoloy

316SS or Incoloy

304SS, 316SS, or Incoloy

316SS

304SS or 316SS

Steel

Steel

Steel

Incoloy

SH

EA

TH

MA

TE

RIA

L G

UID

E

Tubular heating elements perform exceptional heat transfer by conduction, convection or radiation to heat liquids, air, gases and surfaces. In most heater assemblies, tubular element design configurations vary — round, triangular, flat press and formed. Bends are made to customer requirements Custom built from 0.200" to 0.475" diameters, a multitude of sheath materials with sheath temperature capabilities up to 1600&amp, amp, deg, F, watt densities to fit many applications and up to 600 volts. Available with over 20 optional terminations and many stocked accessories.

Tubular Heaters

Inherent mechanical flexibility permits forming and bending into many shapes and sizes providing unique adaptability for the process engineer or product designer. Various sheath material selections are available to provide suitable operation from liquid immersion service through high temperature (1600 °F) radiant heating service.

GENERAL DESCRIPTION AND CONSTRUCTION

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3 MARATHONHEATER

Sheath Temperature(Max.)

Sheath Material

Steel

Stainless

Incoloy

750°F

1200°F

1600°F

Sheath Temperature(Max.)

Sheath Material

Steel

Stainless

Incoloy

750°F

1200°F

1600°F

Normal watt Density wattper Sq. Inch.

Approx. 20

Approx. 30

Approx. 30

SHEATH TEMPERATURE

THREADED FITTINGS :-Sheath Temperature Recommendations :-

Threaded fittings can be supplied mounted on the terminal ends of tubular elements. A gasket washer permits liquid tight installation in tank walls for immersion heating of water, oil, and other liquids. Watertight gasket and lock nut are included.

For maximum life, tubular elements should be operated within the limits listed in the chart, and lower watt density if higher temp. Watt density should be a function of the application. We can also manufacture any size in between fractional lengths.

TERMINATIONS

A

B

C

D

E

F

G

TYPE DRAWING ELEMENT THREADED SIZE LENGTH DESCRIPTION

.315, .330

.430, .475

.260, .315

.330, .430

.475

260, .315

.330, .430

.475

.260, .315

.330, .430

.475

.260, .315

.330, .430

.475

.260, .315

.330, .430

.475

.260, 315

.330, .430

.475

6-32

10-32

10-32 x 1/4screw

10.32 x 1/4

N/A

N/A

N/A

10-32

7/8”

1-1/8

9/16”

½”-1-1/2”

9/16”

.375”Right Angle 1/4”Quick Disconnect

1/4”quick Disconnect Flag

1/4”QuickDisconnect

Right Angle Lug

Screw Lug

Screw Lug-Flag

Threaded Stud7/8”

9/16”

Tubular Heaters3

1/4 ± 1/16L

.625”

.375” min.L

1/4 ± 1/16

10-32 - 1/4

L

.525”

.25”

L

.25” .32”

.5”

.5”

L

.32”

.40”

.375”

4MARATHONHEATER

Listed below are our standard recommendations. Combinations of these end seals are available as are other options not listed here.

End Seal Type Max. Cont. Use Typical or General Usage / Application

Silicone Barrier

Epoxylite

Silicone Rubber

Epoxy

Rubber Molded End Seal

High Temp Silicone Rubber

Cement P

MS

EX

VH

V

E

RU

2000 °F

600 °F

600 °F

450 °F

350 °F

266 °F

250 °F

Extremely high temperature applications, for low vapor transmission rates

Porous, moisture resistant, general usage on tubular products

Hermetic, long term stable insulation resistance

Moisture / Chemical Resistant. General Sealing

Moisture / Chemical Resistant. General Sealing

Hermetic, long term stable insulation resistance

Hermetic, long term stable insulation resistanceFull terminal immersion capability

ALTERNATE SEALS AVAILABLE UPON REQUEST.

Tubular Heaters use Magnesium Oxide (Mgo) as an insulator between the heating coil and the sheath. Mgo is hygroscopic and will absorb and retain water molecules from its surroundings. This is an undesired characteristic as any humidity inside the heater will corrode the resistance wire, degrade the resistance of the heater, and even allow an arc between the sheath and the resistance wire.To prevent moisture from affecting the performance of the heater, a variety of end seals are available.

H

J

K

L

Type Drawing Element Threaded Size Length Description

.200

.260

315, .330

.430

315, .330

.440

Wire Size byamps

N/A

10-32

6-32

10-32

1-3/4”

1-7/8”

1 1/8”Threaded Stud High

Voltage Constructions

Threaded Stud with silicon Boot

Rubber Overmold

Hermetic Seal

Lead Wires, Weldedstud (5-40, 6-32),

1/4”quick connects

15/16”.260

.440

1/4-28

6”±

1-3/4”

2”

2-1/8”

Tubular Heaters

M

4

END SEALS

½”

L

L

B

L

L

5 MARATHONHEATER

mFree Air / Radiant mWrapped around

mLiquid immersion (with threaded fittings / flanges) mCast into aluminum, bronze, or cast iron

mClamped on

Marathon offers the broadest selection of stocked

Immersion Heaters in the industry. Industrial immersion

heaters are designed for direct contact heating of water,

oils, viscous materials, solvents, process solutions and

gases for many industrial heat applications. Since all

heat is generated within the liquid or process,

virtually 100% energy efficiency is achieved.

immersion heaters are designed for

installation into a pipe body, tank

or pressure vessel using

standard pipe size.

A) FLANGED IMMERSION HEATERS

B) SCREW PLUG IMMERSION HEATERS

These heaters are available in wide selection of rates, sizes and

sheath materials suitable for the heating requirements of water, air

and others gases. Flanged immersion heaters are very efficient since

all energy that is generated is dissipated directly into the medium

which is being heated.

Screw plug immersion heaters consist of tubular

elements in a threaded hex plug. Some models are provided

with a thermowell for the temperature control sensor and

variety of electrical enclosures for electrical connections. They screw

directly through threaded opening in tank walls to heat liquids, viscous fluids, forced air, and

gases by direct contact.

CIRCULATION HEATERS

Marathon circulation heaters are packaged units consisting of a screw plug or flanged immersion heater mounted in a thermally insulated heating chamber for efficient heating of a flowing medium by in-line or side-arm operation. Thermocouple sensors can be provided to connect to most any

controllers select from many terminals enclose wise, sheath & vessel material, flanged

connections & controls. Application include: Water Heating, Freeze

Protection, heat Transfer Oil heating, Fuel Oil Heating, Stea, air, and Gas heating

and others.

A) FUAL OIL CIRCULATION HEATERS

Light and Medium weight Oil Heaters

a r e i d e a l f o r t e m p e r a t u r e

maintenance and for improving flow

characteristics of oils. Fuel and gas

heaters are also used for heat transfer

Oils. Heavy or Fuel oil Heaters will reduce

the viscosity, thereby improving flow and

process efficiency.

B) STEAM AIR GAS CIRCULAR HEATERS

Marathon circular heaters provide a cost

effective means for heating air and common

industrial gases such as Argon, helium and Nitrogen

as well as gaseous mixtures for a wide variety of

industrial processes. INCOLOY elements and a Stainless

steel vessel enhance safe operation to nealy 1400°F outlet gas

temperature in air, gas or steam superheating applications.

Applications

Flanged Immersion Heaters,

both round flange and square

flange models are a great

choice for application requiring

larger watteges . Flanged

immersion heaters are designed

for installation into a pipe body,

tank or pressure vessel using

standard pipe size.

TYPICAL APPLICATIONS

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IMMERSION HEATERS

CIRCULATION HEATERS

Hot Rod Cartridge Heaters

6MARATHONHEATER

Applications

Marathon Tank Heating system are uniquely designed to

heat large storage tanks located above or below ground

and containing highly viscous fluids or heat sensitive

materials. We offeres uniquely designed electric heating

systems for large storage tanks. The systems can be

installed in above or below ground tanks made of steel,

concrete, or fiberglass.

Process air heaters, are employed in heating air or other gases

in ducts, autoclaves, or ovens for many industrial heat

applications. sheathed tubular, finned tubular, and finned strip

elements consistently outperform gas, oil, and open coil

electric unit in both heating efficiency and safety.

A) DUCT HEATERS

Marathon designed process air duct heaters specially for the

power generation industry. For instance, our designer optimize

the heating of air fed into combustion and prevent

condensation. Durable INCOLOY sheath elements provide for

outlet temperatures of up to 1200°F/650°C.

Due to moisture content and low temperature inside

hoppers, choking & accumulation of fly ash occurs to

maintain temperature inside hoppers for effective flow of

fly ash to ash disposal system. to remove these kind of

problems, we have to use ESP hoppers heaters, so that they

heat up the hopper and hopper get clean which got blocked

by dust & ash.

Hopper heaters for efficient removal of ash on electrostatic

precipitator normally called ESP Hopper Heaters. Due to

Flue gas condensation ,Fly ash hoppers experience

'pluggage' problems. Marathon supplies electric surface

heating system for fly ash hoppers on electrostatic

precipitator in all type of industries who face the problem

of blockage in Hoppers. The blockage is so severe that

often pneumatic drilling equipment and explosives are

required to free the system. This problem, known as Flash

Freezing, is extremely inconvenient and very costly.

ESP HOPPER HEATERS

PROCESS AIR HEATERS

LARGE TANK HEATERS

7 MARATHONHEATER

Applications

mFrame type Hopper Heater.mImmersion type Hopper Heater.mShaft Insulator Heater.mSupport Insulator Heater.

mElectrostatic preciptatorsmFabric filter dust collecting hoppers

Following are the varieties of the hopper heater

Application of EPS Hopper Heaters

ESP HOPPER HEATERSVARIETY &APPLICATION

FINNED TUBULAR HEATERS

Finned tubular heating elements from Marathon are the most

versatile and the best suited solutions to a large number of

applications. Finned tubular elements from Marathon are factory-

configured to almost any shape or size. Custom bending diameters can

be made upon request. Typically using steel, stainless steel, Incoloy,

Inconel alloys. Tubular elements are often regarded as the foundation

of all heating elements. These heating elements have a strong outer

sheath to help protect the heater from physical stress and user high

quality alloys to allow efficient heat transfer from resistance coil to

your heating medium.

KEY FEATURES

¦Brazed, crimped or welded to the element’s cold section.

¦Used as a tight joint to the heater, which is fixed in open tanks or vessels.

¦Supplied in brass, steel or stainless steel.

Forced Air Duct

Drying Ovens

Air Conditioning Systems

APPLICATIONS

TYPICAL APPLICATIONS

¦Deionized ¦Lubricating oils at API specified watt densities

¦Demineralized ¦Heat transfer oil

¦Clean ¦Paraffin

¦Potable ¦Caustic cleaners

¦Process ¦Nitrogen, hydrogen and other air/gas systems

¦Industrial water rinse tank ¦Superheating steam

¦Hydraulic oil, crude, asphalt

WATER

MARATHON HEATER (INDIA) PVT. LTD. is second

manufacturing unit of Marathon Heater Inc. USA.

Marathon Heater Inc. is founded in 1996, they are one

of the largest high quality industrial heater

manufacturer in USA.

Aim of establishing Marathon Heater INDIA is to serve

faster and economical Solutions to eastern hemisphere

customer. We are using all raw material imported from

USA and all of our machineries and designing programs

are designed and developed by Marathon USA.

Customer service has always been top priority at

Marathon Heater and everything we do keeping this

goal in mind. That means short lead times on

manufactured products.

At Marathon Heater, Good is not good enough. We are

constantly looking for ways to improve not only our

products but also maintain order processing, design

process and product literature.

About us

MARATHON HEATER (I) PVT. LTD.A-190, Road No.-5, M.I.A. Udaipur - 313003 (Rajasthan) INDIAPh.: +91 294 3052929 Fax: +91 294 3052950E-mail: info@marathonheater.in, akhil@marathonheater.in

MARATHON HEATER INC. (USA)808 Hackberry Ln, Del Rio, TX 78840, USAPh.: 830 775 1417 Fax: 830 775 4379E-mail: sales@marathonheater.com

ISO 9001-2008 Certified

UL & CSA Certified

www.marathonheater.com

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