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128 Maple Street,  Danvers
Massachusetts, 01923-2096
Hotwatt Telephone Number Tel # (978) 777-0070   Hotwatt Fax Number Fax # (978) 774-2409
Hotwatt email Email: Sales@hotwatt.com

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HOTWATT PRODUCTS MADE IN USA

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DRUM HEATER

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Tubular Heaters:  Straight and Formed

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U.L. AND C-UL Recognized 
No.  E177353


Features

  • The Hotwatt Tubular Heater has built-in resistance to shock, vibration, corrosion and temperature extremes.     

  • The heater is swaged, reducing the diameter of the metal sheath and compacting the insulation.  This insures rapid heat transfer and holds the coil in position for forming.

  • Many formations are available.

  • Long, trouble free service.

  • Made in U.S.A.

 

Construction

straight or formed construction

  1. Steel, stainless steel, copper, or Incoloy sheathed elements.

  2. Element wire situated in proximity to outside surface for maximum heat transfer and minimum internal temperature while preserving good dielectric qualities.

  3. Pure magnesium oxide compressed to an optimum density for best heat transfer and electrical insulation at elevated temperatures.

  4. Weld connection.

  5. Cold pin.

  6. Insulator.

  7. Standard post terminal.

Standard Sizes and Materials

The sheath materials available are stainless steel, steel, copper, and incoloy. 
Standard diameters are: .260", .315", .375", .440" and .490". 
Diameter tolerance is .010".


Sheath
Material

Max. Temp.
Allowed
on Sheath
Max.
Length
of Sheath

Max. Cold
Lengths
Steel 750F 252" 96"
Copper 350F 252" 96"
St. Steel 1200F 324" 96"
Incoloy 1600F 324" 96"


Sheath Materials and Watt Densities



Application
Approx.
Operating
Temp.
Rec.
Sheath
Material
Watts/sq.in.
Of Element
Surface
Clamped to
Surfaces
up to  300F
          500F
          800F
        1000F
        1200F
        1400F
Steel
Steel
Incoloy
Incoloy
Incoloy
Incoloy
30
20
15
10
7
2.5
Still Air
(Sheath Temp.)
          800F
        1000F
        1200F
        1400F
Incoloy
Incoloy
Incoloy
Incoloy
7
11
14
30
Clamped into
Machined
Grooves
          500F
          800F
          900F
Steel
St. Steel
Incoloy
25
15
15


Formula for Determination of Unit Wattage

Unit Wattage
  =  Diameter  x  3.142  x  Heated Length  x  Allowable watts/sq.in.

 

Electrical Tolerances and Limits

Sheath Diameter .260" .315" .375" .440" .490"
Min. OHMS/in. .15 .05 .05 .05 .05
Max. OHMS/in. 80 50 50 50 50
Max. Voltage 250 300 480 600 600
Max. Amperes 20 30 40 40 40

Wattage tolerance is + 5%,  -10% at rated volts.


Standard Length Tolerances

Sheath length Length Heated Length
Up to 20" 1/16" 2%
20" to 100" 1/8" 2%
100" to 200" 1/4" 2%


Cold Ends
When not specified, cold ends will be the minimum length as shown in table below.  Longer
cold lengths may be specified. Optional cold ends of unequal lengths are available.

Sheath Length Minimum Cold Ends
Up to 20" 1"
20" to 100" 1 1/2"
100" to 200" 4"



Mounting Fitting

  Mounting Fitting     

Fittings are available with light jam nuts (plated steel), plain washers (plated steel), and/or copper gaskets.

Brass bushings are used with copper and steel sheaths.Silver brazed stainless steel bushings are used with stainless steel and incoloy sheaths.Welded stainless steel bushings are available at additional cost.

Catalog Number Sheath Diameter A" Thread Size B"
EF-12 .260" 1/2"-20
EF-13 .315" 1/2"-20
EF-16 .375" 5/8"-18
EF-17 .440" 3/4"-16
EF-17 .490" 3/4"-16


Forming

If you plan to do the bending required, observe the minimum bend limits in the table,
and do not plan any bend within 1" of a cold end junction.
Annealing for bending must be specified. If Hotwatt is to do the bending, submit a sketch showing clearly the form the bent unit is to take.


Minimum Bend Radius

Diameter .260" .315" .375" .440" .490"
Formed By Factory 1/4" 5/16" 3/8" 7/16" 7/16"
Formed By Customer 3/4" 1" 1 1/4" 1 1/2" 1 1/2"

 

Optional Terminations

Post terminations will be supplied unless otherwise specified.

SF3S:  Post  

 

 

SF2A:  Lead Wire

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SF2A:  Lead Wire

A" B" C" Max.
Amps.
A" Max.
Amps.
.260" 6"-32 5/8" 20 .260" 21
.315" 6"-32 5/8" 20 .315" 28
.375" 8"-32 3/4" 30 .375" 28
.375" 10"-32 1" 40 .440" 28
.440" 8"-32 3/4" 30 .490" 28
.440" 10"-32 1" 40  
.490" 10"-32 1" 40

 

SF3P:  Pin  

 

 

SF23:  Hermetic Seal

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SF23: HERMETIC SEAL

A" B" C" Max.
Amps.
A" B" C" Max.
Amps.
.260" .091" 5/8" 20 .260" 8"-32 1 11/16" 20
.315" .135" 5/8" 20 .315" 10"-32 1 7/8" 30
.375" .156" 3/4" 40 .375" 10"-32 1 7/8" 30
.440" .156" 3/4" 40 .440" 1/4"-28 2 1/8" 40
.490" .156" 3/4" 40 .490" 1/4"-28 2 1/8" 40

 

SF3T:  Tab   SF11:  Quick Connect

SF3T: TAB

SF11:  Quick Connect

A" Max.
Amps.
A" Max
Amps.
.260" 20 .260" 20
.315" 30 .315" 30
.375" 30 .375" 30
.440" 30 .440" 30
.490" 30 .490" 30

 


Sheath Length
Diameter: .260: Incoloy .315: Incoloy .375: Incoloy
Maximum Amperage: 20 30 40
Sheath Length Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 480V
20" TA26-20 555 TA31-20 675 TA37-20 800
40" TA26-40 1210 TA31-40 1465 TA37-40 1745
60" TA26-60 1860 TA31-60 2255 TA37-60 2685
80" TA26-80 2515 TA31-80 3050 TA37-80 3630
100" TA26-100 3170 TA31-100 3840 TA37-100 4570
120" TA26-120 3825 TA31-120 4630 TA37-120 5515
140" TA26-140 4475 TA31-140 5425 TA37-140 6455
160" TA26-160 4640 TA31-160 6215 TA37-160 7395
180" TA26-180 4640 TA31-180 7010 TA37-180 8340
200" TA26-200 4640 TA31-200 7005 TA37-200 9285
220" TA26-220 4640 TA31-220 7005 TA37-220 10225
240" TA26-240 4640 TA31-240 7005 TA37-240 11170

 

Diameter: .440: Incoloy .490: Incoloy .260: St. Steel
Maximum Amperage: 40 50 20
Sheath Length Cat. No. Max.Watts
at 480V
Cat. No. Max.Watts
at 480V
Cat. No. Max.Watts
at 240V
20" TA44-20 960 TA49-20 1055 TT26-20 420
40" TA44-40 2090 TA49-40 2300 TT26-40 910
60" TA44-60 3225 TA49-60 3545 TT26-60 1395
80" TA44-80 4355 TA49-80 4790 TT26-80 1885
100" TA44-100 5485 TA49-100 6035 TT26-100 2375
120" TA44-120 6615 TA49-120 7280 TT26-120 2865
140" TA44-140 7745 TA49-140 8520 TT26-140 3355
160" TA44-160 8880 TA49-160 9765 TT26-160 3845
180" TA44-180 10010 TA49-180 11010 TT26-180 4340
200" TA44-200 11140 TA49-200 12255 TT26-200 4705
220" TA44-220 12270 TA49-220 13495 TT26-220 4705
240" TA44-240 13400 TA49-240 14740 TT26-240 4705

 

Diameter: .315: St. Steel .375: St. Steel .440: St. Steel
Maximum Amperage: 30 40 40
Sheath Length Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 480V
20" TT31-20 505 TT37-20 600 TT44-20 720
40" TT31-40 1095 TT37-40 1305 TT44-40 1570
60" TT31-60 1690 TT37-60 2015 TT44-60 2415
80" TT31-80 2285 TT37-80 2720 TT44-80 3265
100" TT31-100 2880 TT37-100 3425 TT44-100 4115
120" TT31-120 3475 TT37-120 4135 TT44-120 4960
140" TT31-140 4065 TT37-140 4840 TT44-140 5810
160" TT31-160 4660 TT37-160 5550 TT44-160 6660
180" TT31-180 5255 TT37-180 6255 TT44-180 7505
200" TT31-200 5850 TT37-200 6965 TT44-200 8355
220" TT31-220 6440 TT37-220 7670 TT44-220 9205
240" TT31-240 7035 TT37-240 8375 TT44-240 10050

 

Diameter: .260: Steel .315: Steel .440: Steel
Maximum Amperage: 20 30 40
Sheath Length Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 240V
20" TS26-20 280 TS31-20 335 TS44-20 480
40" TS26-40 605 TS31-40 730 TS44-40 1045
60" TS26-60 930 TS31-60 1130 TS44-60 1610
80" TS26-80 1260 TS31-80 1525 TS44-80 2175
100" TS26-100 1585 TS31-100 1920 TS44-100 2745
120" TS26-120 1910 TS31-120 2315 TS44-120 3310
140" TS26-140 2240 TS31-140 2710 TS44-140 3875
160" TS26-160 2565 TS31-160 3105 TS44-160 4440
180" TS26-180 2890 TS31-180 3505 TS44-180 5005
200" TS26-200 3220 TS31-200 3900 TS44-200 5570
220" TS26-220 3545 TS31-220 4295 TS44-220 6135
240" TS26-240 3870 TS31-240 4690 TS44-240 6700

 

Diameter: .315: Copper .440: Copper
Maximum Amperage: 30 40
Sheath Length Cat. No. Max.Watts
at 240V
Cat. No. Max.Watts
at 600V
20" TC31-20 1345 TC44-20 1925
40" TC31-40 2930 TC44-40 4185
60" TC31-60 4515 TC44-60 6445
80" TC31-80 6095 TC44-80 8710
100" TC31-100 6890 TC44-100 10970
120" TC31-120 6890 TC44-120 13230
140" TC31-140 6890 TC44-140 15495
160" TC31-160 6890 TC44-160 17755
180" TC31-180 6890 TC44-180 18885
200" TC31-200 6890 TC44-200 18885
220" TC31-220 6890 TC44-220 18885
240" TC31-240 6890 TC44-240 18885

Wattage
Wattages as shown in the above tables are based on sheath material or voltage/amperage limitations.
For allowable wattage for your application, refer to Sheath Material/Watt Density chart above.

How to Order
Specify:  Catalog number, wattage, voltage, termination, and other optimal features. If forming
is required, include a dimensional sketch and reference formation number, if applicable.

Example:  TA31-40/1000W/240V/SF3S