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Straight heaters

Straight heating elements are designed for heating liquids, gas or solids to cover any customer applications.

The heating element is the “engine” of your heating system!

100% of the heating element is produced in our factory.

The design is based on customer specification: fluid to heat (type and properties), temperature, heat exchange conditions (stagnant or flowing), and environment conditions (ATEX/IECEx or not).

Product overview

  • Power up to 30 kW per heating element
  • Watt density from 0.1 to 20 W/cm²
  • Voltage max. 750 V

Advantages

  • Reliability and robustness of the heating element. High quality raw material.
  • Large range of materials and options according to customer process and conditions of use.
  • Benefit from CETAL’s 50 years of experience as designer and manufacturer!

Operating conditions

  • Normal (non-ATEX)
  • Hazardous areas (ATEX/IECEx) and NEC 505
  • Fluid/solid: from -270 °C (3 K) to 1000 °C
  • Corrosive environment

Water

  • Stagnant water, max load 8 – 12 W/cm², material: copper, 321, 316L
  • Circulating water, max load 10 – 16 W/cm², material: copper, 316L, incoloy 800, incoloy 825
  • Boric water, max load 8 W/cm², material: 316L
  • Boiler water, max load 8 – 16 W/cm², material: 316L, incoloy 800, incoloy 825
  • Chlorated water, max load 6 W/cm², material: incoloy 825
  • Sea water, max load 3.5 – 6 W/cm², material: incoloy 825, inconel 600
  • Demineralized water / deionized / distilled / softened, max load 4 – 6 W/cm², material: 316L, incoloy 800, incoloy 825
  • Domestic hot water, max load 4 – 8 W/cm², material: copper, 316L, incoloy 825
  • Caustic water (2%, 10%, <30%, 70%), max load 2.3 – 7 W/cm², material: 316L, incoloy 825, inconel 600

Oil

  • Fuel oil pre-heating, light fuel oil, C fuel oil, max load 1 – 2 W/cm², material: 321, 316L
  • Heavy fuel, max load 0.5 – 3.5 W/cm² acc to grade, material: 316L
  • Gasoline, kerosene, max load 3 – 3.5 W/cm², material: 316L
  • Machine oil SAE 10, 30, 40 & 50, max load 2 – 3.5 W/cm², material: 316L
  • Mineral oil , max load 0.5 – 3.5 W/cm² acc to temp, material: 321, 316L
  • Lube oil, max load 2.3 W/cm², material: 321, 316L

Acid & corrosive fluid

  • Acetic acid, max load 6 W/cm², material: 316L, incoloy 825
  • Boric acid, max load 6 W/cm², material: incoloy 825
  • Chloric, hydrofluoric, nitric, sulphuric acid, max load 1.5 W/cm², material: teflon coat
  • Boric acid, max load 6 W/cm², material: incoloy 825
  • Alkaline bath, max load 6 W/cm², material: 321 (no corrosive compound), 316L
  • Phosphate bath, max load 4 W/cm², material: 316L, incoloy 825

Glycol

  • Ethylene glycol, propylene glycol, 4 – 8 W/cm² acc. to concentration, material: 321, 316L

Others

  • Asphalt, tar, and other heavy or highly viscous compounds, max load 0.5 – 1.5 W/cm², material: 316L
  • Milk, max load 0.3 W/cm², material: 316L

Gas

  • Air, max load 0.1 – 8 W/cm² acc. to sheath temp., material: 321
  • Circulating air, max load 0.1 – 8 W/cm² acc to sheath temp., material: 309
  • Natural gas, max load 0.1 – 8 W/cm² acc. to sheath temp., material: 321, 316L
  • Argon, nitrogen, load acc. to sheath temp., material: 321, 316L, incoloy 825, inconel 600
  • Propan, butane, load acc. to sheath temp., material: 321, 316L
  • Oxygen, hydrogen, load acc. to sheath temp., material: 316L

Solids

  • Aluminium, brass, bronze cast in, max load 4 – 15 W/cm², material: 309
  • Copper-nickel cast in, max load 5 – 10 W/cm², material: 309
  • Oxychloration, max load 3 W/cm², material: incoloy 800, incoloy 825
  • Calcination, max load 3 W/cm², material: incoloy 800, incoloy 825
  • HC regeneration, max load 2 W/cm², material: incoloy 800, incoloy 825

Technical description

The watt density, tube diameter and the tube sheath are chosen to optimize the reliability and robustness (corrosion, temperature) of CETAL equipments.

Technologies

  • Tubular heating element

Tube diameter & material

  • Tube diameter: 6.5 / 8.5 / 10 / 13.5 / 16 mm
  • Tube material:
    • Stainless steel: AISI 321 (1.4541) / AISI 316L (1.4404) / AISI 309 (1.4828)
    • Others: Incoloy 800 (1.4876) / Incoloy 825 (2.4858) / Inconel 600 (2.4816)
    • Titanium
  • Specific coating: Teflon™ (PTFE) / Halar®
  • Tube type: sealed tube, seamless tube (on request)

Manufacturing

  • 100% of the components come from our high-quality suppliers from Europe
  • 100% manufacturing in CETAL factory

 

 

 

  1. Connection terminals
  2. Tube
  3. Insulation : magnesia oxyde (Mg O), to secure optimized heat transfer and electrical insulation.
  4. Resistance wire: Made of Nickel Chrome 80/20, it is the active part of the heating element (Joule effect)
  5. Cold length
  6. Sealing material: Keeps out external moisture. Different types (silicon, resins, cement) are used depending on the industrial application, the external medium and temperature
  7. Output insulation: Made of steatite ou corundum, it provides dielectric insulation (creepage distance, distance in the air).

CETAL offers a large range of non heating parts / cold parts to meeting any customer specification.

The table below shows the different cold parts available by diameter and length.

Tube Ø 6,5
8,5
10
13,5
16
Ø tige de sortie Ø 2 Ø 3,5 M4 x 0,7 M5 x 0,8 M6 x 1 M8 x 1,25
Lg NCH Matière Acier Matière Inox Matière Acier Matière Inox Matière Acier Matière Inox Matière Acier Matière Inox Matière Acier
35
40
45
55
75
65
95
105
135
150
180
205
200
225
235
260
300
330
365
415
420
445
500
505
530
620
775
800
1000
1340
Materials
Copper Austenitic steel Nickel alloy
AISI code 321 316 L 309 INCOLOY 800 INCOLOY 825 INCONEL 600
DIN code 1.4541 1.4404 1.4828 1.4876 2.4858 2.4816
Usuals diameters
6,5
8,5
10
13,5 (1)
16 (1) (1)
limit temperature of use
250 °C in the air 750 °C 750 °C 1000 °C 950 °C 950 °C 950 °C

(1) Seamless tube on stock

Tube diameter Max voltage
6.5 400V
8.5 415V
10 500V
13.5 690V
16 750V
  • Wire restance tolerance: -5% and +10% of the nominal resistance value
  • Power tolerance < 100W: -/+10%
  • Power tolerance > 100W: +5% – 10%

Sheaths

Very high quality rolled, welded or seamless tube manufactured and inspected according to standards ASTM-DIN ou NFA 49-147

Forming

The heating elements are available in a variety of shapes adapted to the use circumstances defined in the specifications or by the customer

Tolerances

Diameter:

6.5 ± 0.1 mm

13.5 ± 0.1 mm

8.5 ± 0.1 mm

16 ± 0.1 mm

10 ± 0.1 mm

Length:

± 1 % with + 5 mm minimum

Standard material:

The dimensions in the table are maximal

Dimensions intended to prevent assembly problems

Type B 100

  • THREADED STEEL OR STAINLESS STEEL ROD

Dimensions Sheaths Ø
Ø mm C I 6.5 8.5 10 13.5 16
M4 x 0.7 20 5
M4 x 0.7 20 5
M4 x 0.7 20 5
M5 x 0.8 30 10
M5 x 0.8 30 10
M6 x 1 35 10
M6 x 1 35 10
M8 x 1.25 35 10
M8 x 1.25 35 10

Type B 200

  • PLAIN ROD

Dimensions Sheaths Ø
Ø mm C I 6.5 8.5 10 13.5 16
2 20 5
3.5 25 5

Type B 300

  • BRAID OR CABLE

Dimensions Sheaths Ø
section mm² C 6.5 8.5 10 13.5 16
PVC INSOLATED COPPER CABLE H07VK 70°C
1.5 (1)
2.5 (1)
RUBBER INSOLATED COPPER H07RNF 85°C
1.5 (1)
2.5 (1)
4 (1)
1.5 (1)
2.5 (1)
4 (1)
6 (1)
10 (1)
SILICONE INSOLATED COPPER 180°C
1.5 (1)
2.5 (1)
4 (1)
6 (1)
GLASS BRAIDED COPPER 280°C
1 (1)
1.5 (1)
2.5 (1)
4 (1)
6 (1)
INSOLATED NICKEL WIRE 700°C
1.5 (1)
2.5 (1)
4 (1)
6 (1)

(1) Cable lenght go request

Dimensions Sheaths Ø
section mm² C 6.5 8.5 10 13.5 16
NICKEL BRAIDED NICKEL 350°C / 450°C
1 (1)
2.5 (1)
2.5 (1)
4 (1)
6 (1)

(1) Cable lenght go request

Dimensions Sheaths Ø
section mm² C 6.5 8.5 10 13.5 16
CERAMIC NICKEL WIRE
1.5 (1)
2.5 (1)

(1) Cable lenght go request

Type B 400

  • 6,35 TAB

Dimensions Sheaths Ø
Description C I 6.5 8.5 10
Straight single 25 5
carved single 23 5
Transverse single 15 5
Straight twin 22 5
Delta twin 22 5

Type B 500

  • FLAT TERMINAL

Dimensions Sheaths Ø
C I 6.5 8.5 10 13.5 16
25 5
30 10

Type B 600

  • THREADED TERMINAL

Code Dimensions Sheaths Ø
Ø mm C I 6.5 8.5 10
LAITON : B 614-6 M6 x 1 30 5
INOX : B 623-6 M6 x 1 21 5

Type B 700

  • SCREW TYPE BRASS TERMINAL

Dimensions Sheaths Ø
C I 6.5 8.5 10
15 5

Type B 800

  • BRAZABLE STEATITE

Dimensions Sheaths Ø
Ø mm C I 6.5 8.5 10 13.5 16
M 6 37 13
M 6 37 13
M 8 55 15
Use in humid conditions watertight
temperature from – 60°C to + 200°C
defrosting resistance

Type B 900

  • BRASS PIN TERMINAL

Dimensions Sheaths Ø
Ø mm C I 6.5 8.5 10 13.5 16
6 22 5
6 22 5
  • According to CE European directives and CE market (for Europe)
  • ATEX/IECEx certificate for component or system
  • EAC CU TR, c CSA us (NEC 505)

Electrical tests

  • Power test by cold resistance measurement. Allowed tolerance: -5% and +10% of the nominal resistance value.
  • Insulation test, direct voltage 500 V, mini cold value is > 100 Megohms
  • Dielectric test, (2U + 1000 V)  x 1,2 during 1 second
  • The stray current and the hot dielectric rigidity can be measured on a sample at operating temperature (on request).
  • 100% of the heating elements are tested before shipment (final control)

Mechanical tests

  • Visual inspection
  • X-ray test (if required)

Dimensional test

  • Critical dimensions are tested
  • Marking: specific customer marking on each heating element
  • Specific connection terminals (on request)
  • Fixing part such as connectors (on request)

CETAL deliver straight heating elements to many customers in different industries where the reliability and the quality is a must.

The heating element being the active part (“engine”) of the final product or within the customer process, our customer make the choice of reliability!