Ceramic radiant tube SER-C
Technical Information · GB
Edition 03.12
• Suitable for high temperature applications and high radiation output
thanks to ceramic material
• Can be used in many applications thanks to different radiant tube diameters
• Patented flange connection for improved gas tightness
• No counter bearing required due to high dimensional stability
• Long maintenance intervals, no rotation of radiant tube
• Long service life thanks to high resistance to oxidation and corrosion
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2
Table of contents
Ceramic radiant tube SER-C . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Selection table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1 Type code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Project planning information . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Scope of delivery/delivery of items . . . . . . . . . . . . . . . . . 7
4.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.3 Radiant tube length . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.4 Radiant tube distances . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.5 Limiting the heat flow rate in the case of radiant tube
heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.6 Resistance of SiSiC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Segmented flame tube SICAFLEX® . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Cruciform spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 Flue gas guide tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SER-C · Edition 03.12
t
= To be continued
Application
3
Ceramic radiant tube SER-C
Flame tube
1 Application
The ceramic single-ended radiant tube SER-C (SER = Single
ended radiant tube) is used in conjunction with a recuperative
burner for indirect heating in heat treatment processes where
the combustion gases must be separated from the product.
A flame tube must be fitted inside the ceramic radiant tube
SER-C to guide the hot flue gases. In the case of vertical installation, a cruciform spacer must also be fitted to ensure optimum
sizing of the recirculation gap – see page 11 (Accessories).
Recirculation gap
Ceramic single-ended
radiant tube SER-C
Cruciform spacer
SER-C · Edition 03.12
Application
The ceramic radiant tube SER-C with
patented flange connection is gas-tight.
SER-C · Edition 03.12
4
Roller hearth furnace for steel tube
production
Ceramic radiant tubes SER-C in roller
hearth furnace during installation work
5
2 Certification
Approval for Russia
Certified by Gosstandart pursuant to GOST-TR.
Approved by Rostekhnadzor (RTN).
SER-C · Edition 03.12
6
3 Selection
3.1.1 Type code
The dimensions of the ceramic single-ended radiant tube
SER-C are suitable for use in conjunction with the ceramic self
recuperative burner ECOMAX..C.
Standard combinations:
Radiant tube
Burner
SER-C 100/088
ECOMAX 0C
SER-C 142/128
ECOMAX 1C*
SER-C 162/148
ECOMAX 2C*
SER-C 202/188
ECOMAX 3C*
Segmented flame
tube
SICAFLEX
100/088/084
SICAFLEX
142/127/123
SICAFLEX
162/147/143
SICAFLEX
202/186/182
* Versions with flange connection for smaller burners are available – see
selection table.
3.1 Selection table
W1000 W1500 W1500
to
to
to
F03 F0 F1 F2 F3 Z
W2600 W2600 W3000
SER-C 080/068
SER-C 100/088
SER-C 142/128
* SER-C 162/148
* * SER-C 202/188
* * * = standard, = available
* Additional flue gas guide tube required.
Order example
SER-C 142/128–W1500 F1
SER-C · Edition 03.12
Code
SER-C
080/068
100/088
142/128
162/148
202/188
W1000
W1100
W1200
W1300
…
W3000
F03
F0
F1
F2
F3
Z
Description
Ceramic single-ended radiant tube
External dia./internal dia. [mm]
80/68
100/88
142/128
162/148
202/188
Length W [mm]
1000
1100
1200
1300
…
3000
Flange connection for
ECOMAX 03
ECOMAX 0
ECOMAX 1
ECOMAX 2
ECOMAX 3
Deviation from standard
7
4 Project planning information
4.1 Scope of delivery/delivery of items
Ceramic radiant tube with fitted flange connection including
burner seal, threaded bolts, nuts and washers for burner
attachment.
Mounting gasket to be installed between SER-C and furnace
flange is supplied.
Before delivery, all radiant tubes undergo non-destructive
testing for possible capillary cracks. On receiving the delivery,
check that the shock sensors on the packaging are intact.
A liquid in a glass tube turns irreversibly red upon heavy impact
during transportation.
SHOCK WATCH
WARNING
HANDLE WITH CARE
SER-C · Edition 03.12
8
4.2 Installation
Install the radiant tube shock-free and free of mechanical
stress. Force must not be applied to the radiant tube by the
furnace lining.
Ensure that there are threaded bolts on the furnace flange to
attach the ceramic radiant tube to the furnace. The furnace
flange must be level with and at right angles to the bushing
in the furnace wall.
Ensure that there is an annular gap between the radiant tube
and the furnace lining.
The flange thickness P1 of the radiant tube including the burner
seal and the thickness N1 of the mounting gasket add up to
either 34 or 37 mm, depending on the size.
Plan the height M1 of the furnace extension so that the front
edge of the recuperator is flush with the interior furnace wall
(S1 = 0 ± 20 mm) (M1 = G - (P1 + N1) - furnace wall thickness).
When dimensioning the internal diameter of the furnace extension, note the diameter B1 of the compression fitting.
Loosely wrap a Cerablanket mat or similar material around
the radiant tube before installing it in the furnace.
Furnace
extension
≥ 8 mm
G
Annular gap
∅X ∅Y
B1
P1 + N1
Compression
fitting
M1 Furnace wall thickness
SER-C · Edition 03.12
S1
Radiant tube
SER-C 100/088
SER-C 142/128
SER-C 162/148
SER-C 202/188
SER-C compression Ceramic radifitting
ant tube ∅ X
∅ B1
in mm
in mm
160
100
200
142
220
162
260
202
Lining
∅Y
in mm
≥ 140
≥ 180
≥ 200
≥ 240
9
4.3 Radiant tube length
4.4 Radiant tube distances
The maximum length W of the single-ended radiant tube SER-C
depends on the clear furnace width (furnace height) J2 and
the burner length G.
∅X
Calculation
W ≤ J2 + G + S1 - 40 mm
1.2X
W
≥ 40 mm
G
S1
∅X
J2
The minimum length W of the radiant tube depends on the
burner length G and the flame length.
Calculation
W > G + 2 x flame length
SER-C · Edition 03.12
2.5X
The centre to centre distance of the radiant tubes should be
≥ 2.5X. The distance of the radiant tube from the furnace wall,
from the furnace floor or from the material to be heated should
be 1.2X to the side and ≥ 40 mm to the front.
10
4.5 Limiting the heat flow rate in the case of
radiant tube heating
Net heat flow rate [kW/m²]
When designing a radiant tube heating system, it must be
ensured that the permitted material temperature of the radiant
tube and flame used is not exceeded. Precise determination
of this temperature requires calculation of heat exchange. The
diagram shows the maximum heat flow values at which the
permitted material temperatures (1050 °C for M-recuperator,
1100 °C for SER-M made of 2.4879 and 1350 °C for SiSiC) are
reached.
100
90
80
ECOMAX C + SER-C
70
60
50
40
30
20
ECOMAX M + SER-M
10
0
500 600
700
800
900 1000 1100 1200 1300
Furnace temperature [°C]
SER-C · Edition 03.12
4.6 Resistance of SiSiC
The ceramic radiant tube SER-C consits of reaction-bound
silicon carbide (SiSiC), infiltrated with metallic silicon. During
the manufacturing process, a protective layer made of SiO2
is formed on the surface, which ensures very good chemical
resistance.
A minimum humidity in the protective atmosphere is required
in order to maintain the protective layer. Too low a humidity
(or too low an O2 content) may lead to conversion of SiO2 to
gaseous SiO and may thus result in gradual destruction of the
protective layer and the radiant tube.
Impurities such as fluorine, sulphur and chlorine in the furnace
atmosphere also lead to chemical attack and shorten the
service life of the ceramic radiant tube SER-C.
11
5 Accessories
5.1 Segmented flame tube SICAFLEX®
Segmented ceramic flame tubes SICAFLEX® to guide hot flue
gases in radiant tubes.
Further information can be found in the Technical Information
bulletin SICAFLEX® segmented flame tube.
Order No. on request.
5.2 Cruciform spacer

For installation of the SICAFLEX® segmented flame tube in
vertical radiant tubes. The cruciform spacer ensures optimum
sizing of the recirculation gap between the segmented flame
tube and the burner.
Material: refractory clay.
SER-C · Edition 03.12
Available on request in different sizes depending on the SICAFLEX® sizes and different heights.
5.3 Flue gas guide tube
To guide the flue gases if smaller burners are used than those
normally intended; see page 6 (Selection). The flue gas guide
tube ensures sufficient heat exchange via the burner recuperator.
Material: vacuum moulded pulp.
Available on request in different sizes suitable for the SER-C
and ECOMAX burner sizes.
12
6 Technical data
Material:
Radiant tube: SiSiC, max. application temperature 1350°C,
Flange connection: heat-resistant steel.
W
M16
(ECOMAX 0 = M12)
S1
∅X
∅ 18 mm
∅Y
(ECOMAX 0 ∅ 14 mm)
C1
B1
0,7 – 1,5 × ∅X
D1 (ECOMAX 0 – 3 = 30 mm)
P1 + N1
I1
≥ 8 mm
G
A1
F1
W2
Dimensions
[mm]
SER-C 080/068
SER-C 100/088
SER-C 142/128
SER-C 162/148
SER-C 202/188
∅X
80
100
142
162
202
1) In 100 mm increments.
2) Applicable for standard
SER-C · Edition 03.12
∅Y
≥ 120
≥ 140
≥ 180
≥ 200
≥ 240
W 1)
1000 – 2600
1000 – 2600
1500 – 2600
1500 – 3000
1500 – 3000
A1
240
240
280
280
325
∅ B1
160
160
200
220
260
flange connections, see page 6 (Selection table).
F1
290
290
330
330
385
I1 2)
210
210
290
290
330
P1
≈ 34
≈ 34
≈ 37
≈ 37
≈ 37
S1
S1
=
0 ± max. 20
Type
W2
35
35
50
50
50
13
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Kromschröder AG
Michael Rehkamp
m.rehkamp@kromschroeder.com
Osnabrück
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SER-C · Edition 03.12
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