KTR RIGIFLEX-N Operating/Mounting Instructions

RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
KTR-N
Sheet:
Edition:
47411 EN
1 of 19
2
RIGIFLEX®-N
Torsionally stiff steel lamina coupling
according to directive 2014/34/EU and UK directive SI 2016 No. 1107
Type A-H
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
KTR-N
Sheet:
Edition:
47411 EN
2 of 19
2
RIGIFLEX®-N is a torsionally stiff flexible steel laminae coupling. It is able to compensate for shaft
misalignment, for example caused by thermal expansion, etc.
Type A-H allows to replace a coupling without having to disassemble the driving or driven machine,
respectively.
Table of contents
1
Technical data
3
2
Advice
4
2.1
2.2
2.3
2.4
2.5
2.6
4
4
4
5
5
5
3
4
General advice
Safety and advice symbols
General hazard warnings
Intended use
Coupling selection
Reference to EC Machinery Directive 2006/42/EC
Storage, transport and packaging
5
3.1
3.2
5
6
Storage
Transport and packaging
Assembly
6
4.1
4.2
4.3
4.4
4.5
6
7
7
8
9
Components of the couplings
Advice for finish bore
Assembly of the coupling
Disassembly of the coupling
Displacements - alignment of the coupling
5
Start-up
10
6
Breakdowns, causes and elimination
11
7
Disposal
12
8
Maintenance and service
13
9
Spares inventory, customer service addresses
13
10
Enclosure A
Advice and instructions regarding the use in
10.1 Intended use in
potentially explosive atmospheres
potentially explosive atmospheres
10.2 Inspection intervals for couplings in
Please observe protection
note ISO 16016.
Drawn:
Verified:
14
potentially explosive atmospheres
10.3
marking of coupling for potentially explosive atmospheres
10.4 EU Declaration of conformity
10.5 UK Declaration of conformity
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
14
15
16
18
19
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
1
KTR-N
Sheet:
Edition:
47411 EN
3 of 19
2
Technical data
Illustration 1: RIGIFLEX®-N, type A-H
Table 1: Dimensions
46
56
66
76
86
106
General
DH
69
85
105
124
145
168
42
55
65
75
85
105
L
L = L1 + L2
+ DBSE
Size
Dimensions [mm]
Max. finish bore
[mm]
D
L1, L2
45
55
65
75
85
105
E
5.0
4.8
8.0
8.0
10.0
12.0
DBSE 1)
140
180
140
180
140
180
140
180
140
180
180
100
100
100
-
250
250
250
250
250
250
Clamping screws
DIN EN ISO 4762
MxLM
TA [Nm]
M5x25
8.1
M6x30
14
M8x35
34
M10x40
67
M12x55
115
M12x55
115
1) Other shaft distance dimensions (DBSE) available on request
Table 2: Torque and speed
Size
TKN
TK max
TKW
Torque
[Nm]
Max. speed n [rpm]
46
90
180
45
5000
56
255
510
127.5
5000
66
450
900
225
5000
76
975
1950
487
5000
86
1500
3000
750
4500
106
2400
4800
1200
4000

Please note that the standard type of coupling has been designed for horizontal assembly
only. With vertical or slanting coupling assembly vertical support may be necessary. Please
consult with KTR for any other applications.
!
In case if a dimensional drawing was prepared for the coupling, the dimensions specified
have to be primarily observed.
The operator of the machine should be provided with the dimensional drawing.
RIGIFLEX®-N couplings with attachments that can generate heat, sparks and static charging
(e. g. combinations with brake drums, brake disks, overload systems such as torque
limiters, fan impellers etc.) are not permitted for the use in potentially explosive
atmospheres.
A separate analysis must be performed.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
2
KTR-N
Sheet:
Edition:
47411 EN
4 of 19
2
Advice
2.1 General advice
Read through these operating/assembly instructions carefully before you start up the coupling.
Pay special attention to the safety instructions!
The RIGIFLEX®-N coupling is suitable and approved for the use in potentially explosive
atmospheres. When using the coupling in potentially explosive atmospheres, observe the special
advice and instructions regarding safety in enclosure A.
The operating/assembly instructions are part of your product. Please store them carefully and close to the
coupling. The copyright for these operating/assembly instructions remains with KTR.
2.2 Safety and advice symbols
STOP
!

Warning of potentially explosive
atmospheres
This symbol indicates notes which may contribute to
preventing bodily injuries or serious bodily injuries that
may result in death caused by explosion.
Warning of personal injury
This symbol indicates notes which may contribute to
preventing bodily injuries or serious bodily injuries that
may result in death.
Warning of product damages
This symbol indicates notes which may contribute to
preventing material or machine damage.
General advice
This symbol indicates notes which may contribute to
preventing adverse results or conditions.
Warning of hot surfaces
This symbol indicates notes which may contribute to
preventing burns with hot surfaces resulting in light to
serious bodily injuries.
2.3 General hazard warnings
STOP
With assembly, operation and maintenance of the coupling it has to be made sure that the
entire drive train is secured against accidental switch-on. You may be seriously hurt by
rotating parts. Make absolutely sure to read through and observe the following safety
indications.
• All operations on and with the coupling have to be performed taking into account "safety first".
• Make sure to switch off the power pack before you perform your work on the coupling.
• Secure the power pack against accidental switch-on, e. g. by providing warning signs at the place of switch-on
or removing the fuse for current supply.
• Do not reach into the operating area of the coupling as long as it is in operation.
• Secure the coupling against accidental contact. Provide for the necessary protection devices and covers.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
2
KTR-N
Sheet:
Edition:
47411 EN
5 of 19
2
Advice
2.4 Intended use
You may only assemble, operate and maintain the coupling if you
• have carefully read through the operating/assembly instructions and understood them
• are technically qualified and specifically trained (e. g. safety, environment, logistics)
• are authorized by your company
The coupling may only be used in accordance with the technical data (see chapter 1). Unauthorized modifications
on the coupling design are not admissible. We will not assume liability for any damage that may arise. In the
interest of further development we reserve the right for technical modifications.
The RIGIFLEX®-N type A-H described in here corresponds to the technical status at the time of printing of these
operating/assembly instructions.
2.5 Coupling selection
!
For a long-lasting and failure-free operation of the coupling it must be selected according to
the selection instructions for the particular application (see catalogue drive technology
"RIGIFLEX®-N").
If the operating conditions (performance, speed, modifications on engine and machine)
change, the coupling selection must be reviewed.
Make sure that the technical data regarding torque refer to the laminae set only. The
transmittable torque of the shaft-hub-connection must be reviewed by the customer and is
subject to his responsibility.
For drives subject to torsional vibrations (drives with cyclic stress due to torsional vibrations) it is necessary to
perform a torsional vibration calculation to ensure a reliable selection. Typical drives subject to torsional vibrations
are e. g. drives with diesel engines, piston pumps, piston compressors etc. If requested, KTR will perform the
coupling selection and the torsional vibration calculation.
2.6 Reference to EC Machinery Directive 2006/42/EC
The couplings supplied by KTR should be considered as components, not machines or partly completed
machines according to EC Machinery Directive 2006/42/EC. Consequently KTR does not have to issue a
declaration of incorporation. For details about safe assembly, start-up and safe operation refer to the present
operating/assembly instructions considering the warnings.
3
Storage, transport and packaging
3.1 Storage
The couplings are supplied in preserved condition and can be stored in a dry and roofed place for 6 - 9 months.
!
Humid storage rooms are not suitable.
Make sure that condensation is not generated. The best relative air humidity is less than
65 %.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
3
KTR-N
Sheet:
Edition:
47411 EN
6 of 19
2
Storage, transport and packaging
3.2 Transport and packaging
!
In order to avoid any injuries and any kind of damage always make use of proper transport
and lifting equipment.
The couplings are packed differently each depending on size, number and kind of transport. Unless otherwise
contractually agreed, packaging will follow the in-house packaging specifications of KTR.
4
Assembly
The coupling is supplied with pre-assembled half shells. Before assembly the coupling has to be inspected for
completeness.
4.1 Components of the couplings
Subassembly 1: Components of RIGIFLEX®-N type A-H
Component
1.1
1.2
1.3
Quantity
1
2
8
Description
Basic body of coupling
Half shells
Clamping screws DIN EN ISO 4762
Illustration 2: RIGIFLEX®-N, type A-H
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
4
KTR-N
Sheet:
Edition:
47411 EN
7 of 19
2
Assembly
4.2 Advice for finish bore
A subsequent modification of the finish bore by the customer is not permissible.
STOP
!
The customer bears the sole responsibility for all machining processes performed
subsequently on finish machined coupling components and spare parts. KTR does not
assume any warranty claims resulting from insufficient remachining.
4.3 Assembly of the coupling
Before starting with the assembly preserving agents have to be removed from the hub bores and feather
keyways. In addition the shaft ends of driving and driven machine have to be carefully cleaned.

We recommend to inspect bores, shaft, keyway and feather key for dimensional accuracy
before assembly.
Pay attention to the ignition risk in potentially explosive atmospheres!
!
With the assembly make sure that the distance dimension DBSE (see table 1) is observed so
that the coupling components are not in contact with each other during the operation.
Disregarding this advice may cause damage to the coupling.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
• Align the shafts of the driving and driven side until the distance
dimension DBSE has been reached (see table 1). Align the feather
keyways of the shaft ends flush (see illustration 3).
• Remove the half shells from the basic body of coupling.
• Put the basic body of coupling (component 1.1) onto the shafts of
the driving and driven side (see illustration 3).

Please make sure with assembly of the basic body
of coupling to insert the feather keyway correctly
into the keyway of the coupling hubs. If necessary,
the shaft has to be lightly turned.
• Hand-tighten the basic body of coupling and the half shells
(component 1.2) with the clamping screws (component 1.3) until
the coupling hubs and half shells fit on the shafts.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Illustration 3: Assembly of the coupling
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
4
KTR-N
Sheet:
Edition:
47411 EN
8 of 19
2
Assembly
4.3 Assembly of the coupling

Make sure correct assignment of half
shells with the coupling hub. Please
observe marking of balancing X (Y) as
per illustration 4.
• Hand-tighten the components first with the clamping
screws to be assembled reciprocally (see illustration 2
and illustration 3).
Illustration 4: Marking of coupling
• Tighten the clamping screws reciprocally and with several
revolutions until all clamping screws have reached the full
tightening torque TA (see table 1).

!
Please make sure that the gap width S between the
basic body of coupling (component 1.1) and half
shell (component 1.2) is equal. If necessary, the
alignment must be corrected.
Having started up the coupling, the coupling has to
be inspected for damages at regular maintenance
intervals and it has to be replaced, if necessary.
Illustration 5: Gap width
4.4 Disassembly of the coupling
STOP
Parts released or falling down may cause injury to persons or damage on the machine.
Secure the components before disassembly.
• Unscrew and remove the clamping screws (component 1.3) and the half shells (component 1.2).
• Lift the coupling from the shaft ends.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
4
KTR-N
Sheet:
Edition:
47411 EN
9 of 19
2
Assembly
4.5 Displacements - alignment of the coupling
The displacement figures specified in table 3 provide for sufficient safety to compensate for external influences
like, for example, thermal expansion or foundation settling.
In order to ensure a long service life of the coupling and avoid hazards with the use in
potentially explosive atmospheres, the shaft ends must be accurately aligned.
Please absolutely observe the displacement figures specified (see table 3). If the figures are
exceeded, the coupling will be damaged.
The more accurate the alignment of the coupling, the longer is its service life.
If used in potentially explosive atmospheres for explosion group IIC, only half of the
displacement figures (see table 3) are permissible.
!
Please note:
• The displacement figures specified in table 3 are maximum figures which must not arise in parallel. If radial,
axial and angular displacement arises in parallel, these values must be reduced (see illustration 7).
• Please inspect with a dial gauge, ruler or feeler gauge whether the permissible displacement figures specified
in table 3 can be observed.
Axial displacements
Radial displacements
Angular displacements
Illustration 6: Displacements
Examples of the displacement
combinations specified in illustration 7:
Illustration 7:
Combinations of
displacement
Example 1:
Kr = 10%
Kw = 80%
Ka = 10%
Example 2:
Kr = 30%
Kw = 30%
Ka = 40%
Ktotal = Ka + Kr + Kw  100 %
Table 3: Displacement figures
Size
46
56
66
76
86
106
Axial
displacement Ka
[mm]
±1.4
±1.2
±1.6
±1.8
±2.2
±2.4
DBSE = 100
1.27
0.85
0.73
-
Radial displacement
Kr [mm]
DBSE = 140
DBSE = 180
DBSE = 250
1.97
2.67
3.89
1.33
1.82
2.68
1.22
1.71
2.57
1.15
1.64
2.49
1.12
1.61
2.47
1.44
2.30
DBSE = X
Kr = [X-2 •
(l3 - l1) - E1] •
tan(KW)
Angular
displacement 1)
Kw [°]
1.0
0.7
0.7
0.7
0.7
0.7
1) each laminae set
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
5
KTR-N
Sheet:
Edition:
47411 EN
10 of 19
2
Start-up
Before start-up of the coupling, inspect the alignment and the distance dimension DBSE and adjust, if necessary,
and also inspect the screw connections of the half shells for the tightening torques specified.
If used in potentially explosive atmospheres all screw connections must be secured against
working loose additionally, e. g. conglutinating with Loctite (average strength).
Finally the coupling protection against accidental contact must be fitted. It is required in accordance with
DIN EN ISO 12100 (Safety of Machinery) and directives 2014/34/EU and SI 2016 No. 1107 and must protect
against
• access with the little finger
• falling down of solid foreign objects.
The coupling protection is not part of KTR's scope of delivery and is the customer's responsibility. It must have
sufficient distance to the rotating components to avoid contact safely. Depending on the outside diameter DH of
the coupling, we recommend the following minimum distance:
ØDH to 120 mm = 10 mm, ØDH from 120 mm = 15 mm.
Please check if a proper enclosure (ignition protection, coupling protection, contact protection) has been mounted
and the operation of the coupling is not affected by the enclosure. The same applies for test runs and rotational
direction inspections.
The cover may provide for openings intended for necessary heat dissipation. These openings have to comply with
DIN EN ISO 13857.
The cover must be electrically conductive and included in the equipotential bonding. Bellhousings (magnesium
share below 7.5 %) made of aluminium and damping rings (NBR) can be used as connecting element between
pump and electric motor. The cover may only be taken off with standstill of the unit.
If the couplings are used in locations subject to dust explosion and in mining the user must
make sure that there is no accumulation of dust in a dangerous volume between the cover
and the coupling. The coupling must not operate in an accumulation of dust.
For covers with unlocked openings on the top face no light metals must be used if the
couplings are used as equipment of equipment group ll (if possible, from stainless steel).
If the couplings are used in mining (equipment group l M2), the cover must not be made of
light metal. In addition, it must be resistant to higher mechanical loads than with use as
equipment of equipment group ll.
During operation of the coupling, please pay attention to
• different operating noise
• vibrations occurring.
!
If you note any irregularities with the coupling during operation, the drive unit must be
switched off immediately. The cause of the breakdown must be specified by means of the
table „Breakdowns“ and, if possible, be eliminated according to the proposals. The potential
breakdowns specified can be hints only. To find out the cause all operating factors and
machine components must be considered.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
5
KTR-N
Sheet:
Edition:
47411 EN
11 of 19
2
Start-up
Coating of coupling:
If coated (priming, paintings, etc.) couplings are used in potentially explosive atmospheres,
the requirements on conductibility and coating thickness must be considered. With
paintings up to 200 µm electrostatic load does not have to be expected. If thicker paintings
resp. coatings up to a layer thickness of a maximum of 2.0 mm are applied, the couplings
are not permissible for gases and vapours of category IIC in potentially explosive areas, but
only for gases and vapours of category IIA and IIB.
This also applies for multiple coatings exceeding an overall thickness of 200 µm. Make sure
with painting or coating that the coupling components are conductively connected with the
device/devices to be connected so that the equipotential bonding is not impeded by the
paint or coat applied. Basically painting of the laminae set is not admitted to ensure an
equipotential bonding.
In addition, make sure that the marking of the coupling remains legible.
6
Breakdowns, causes and elimination
The below-mentioned failures can result in an improper use of the RIGIFLEX®-N coupling. In addition to the
specifications given in these operating/assembly instructions make sure to avoid such failures.
The errors listed can only be clues to search for the failures. When searching for the failure the adjacent
components must generally be considered.
The coupling can become a source of ignition by improper use.
EU directive 2014/34/EU requires special care by the manufacturer and the user.
General failures with improper use:
• Important data for the coupling selection are not forwarded.
• The calculation of the shaft-hub-connection is not considered.
• Coupling components with damage occurred during transport are assembled.
• The clearance of the components to be assembled is not coordinated with one another.
• Tightening torques have been fallen below/exceeded.
• Components are mixed up by mistake/assembled incorrectly.
• No original KTR components (purchased parts) are used.
• Maintenance intervals are not observed.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
6
47411 EN
12 of 19
2
Breakdowns, causes and elimination
Breakdowns
Different operating
noise and/or
vibrations occuring
Causes
Hazard notes for
potentially explosive
atmospheres
Misalignment
none
Cap screws working
loose, low micro friction
under the screw head
and on the steel
laminae set
Danger of ignition due to
hot surfaces
Fracture of steel
laminae set due to high
impact
energy/overload
Fracture of steel
laminae set
Operating parameters
do not meet with the
performance of the
coupling
Ignition risk due to
sparking
Operating error of the
unit
Cracks in/fracture of
the steel laminae
sets/fastening screws
!
7
KTR-N
Sheet:
Edition:
Vibrations of drive
Elimination
1) Set the unit out of operation
2) Eliminate the reason for the misalignment
(e. g. loose foundation bolts, fracture of the
engine mount, heat expansion of unit
components, modification of the installation
dimension DBSE of the coupling)
3) For inspection of wear see chapter 10.2
1) Set the unit out of operation
2) Inspect coupling components and replace
coupling components that have been
damaged
3) Tighten the clamping screws to the
tightening torque specified
4) Inspect alignment, adjust if necessary
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the steel laminae sets
3) Inspect coupling components and replace
coupling components that are damaged
4) Assemble coupling components
5) Find out the reason for overload
1) Set the unit out of operation
2) Review the operating parameters and select
a bigger coupling (consider mounting space)
3) Assemble new coupling size
4) Inspect alignment
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the spacer
3) Inspect coupling components and replace
coupling components that are damaged
4) Assemble coupling components
5) Instruct and train the service staff
1) Set the unit out of operation
2) Disassemble the coupling and remove
remainders of the spacer
3) Inspect coupling components and replace
coupling components that are damaged
4) Inspect alignment, adjust if necessary
5) Assemble coupling components
6) Find out the reason for vibrations
When operating with a faulty laminae set (see chapter 10.2), proper operation is not assured.
Disposal
In respect of environmental protection we would ask you to dispose of the packaging resp. products on
termination of their service life in accordance with the legal regulations resp. standards that apply.
• Metal
Any metal components have to be cleaned and disposed of by scrap metal.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
8
KTR-N
Sheet:
Edition:
47411 EN
13 of 19
2
Maintenance and service
Monitoring of the general condition of the coupling can be done both at standstill and during operation. If the
coupling is tested during operation, the operator must ensure an appropriate and proven test procedure (e. g.
stroboscopic lamp, high-speed camera, etc.) which is definitely comparable to testing at standstill. If any
distinctive features occur, an inspection must be made with the machine stopped.
RIGIFLEX®-N is a low-maintenance coupling. We recommend to perform a visual inspection on the coupling at
least once a year. Pay special attention to the condition of the laminae sets, alignment and screw connection of
the coupling.
• Since the flexible machine bearings of the driving and driven side settle during the course of load, inspect the
alignment of the coupling and re-align the coupling, if necessary.
• If some individual laminas are broken, the laminae sets of the coupling have to be replaced. The coupling
components have to be inspected for damages.
• The screw connections have to be inspected visually.
With the use in potentially explosive atmospheres observe chapter 10.2 "Inspection
intervals for couplings in
potentially explosive atmospheres".
9
Spares inventory, customer service addresses
We recommend to store major spare parts on site to ensure the readiness for use of the machine in case if a
coupling fails.
Contact addresses of the KTR partners for spare parts and orders can be obtained from the KTR homepage at
www.ktr.com.

KTR does not assume any liability or warranty for the use of spare parts and accessories
which are not provided by KTR and for the damages which may incur as a result.
KTR Systems GmbH
Carl-Zeiss-Str. 25
D-48432 Rheine
Phone: +49 5971 798-0
E-mail: [email protected]
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
10
KTR-N
Sheet:
Edition:
47411 EN
14 of 19
2
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
Types available:
Type A-H
RIGIFLEX®-N with spacer made of steel only.
10.1 Intended use in
potentially explosive atmospheres
Conditions of operation in
potentially explosive atmospheres
The RIGIFLEX®-N couplings are suitable for the use according to directives 2014/34/EU and SI 2016 No. 1107.
• Protection against hazards arising from lightning must follow the lightning protection concept of the machine or
plant. The relevant regulations and policy for lightning protection must be observed.
• The equipotential bonding of the couplings is made by metal contact between coupling hub and shaft. This
equipotential bonding must not be affected.
The couplings may only be used if their materials are resistant to mechanical and/or chemical influences with
different operating conditions in a way that the explosion protection is not affected.
1. Industry (with the exception of mining)
•
•
•
•
Equipment group II of category 2 and 3 (coupling is not approved/not suitable for equipment group 1)
Substance group G (gases, fogs, vapours), zone 1 and 2 (coupling is not approved/not suitable for zone 0)
Substance group D (dusts), zone 21 and 22 (coupling is not approved/not suitable for zone 20)
Explosion group IIC (gases, fogs, vapours) (explosion groups IIA and IIB are included in IIC) and
explosion group IIIC (dusts) (explosion groups IIIA and IIIB are included in IIIC)
Temperature class:
Temperature class
T2
T3
T4
T5
T6
Ambient or operating temperature Ta 1)
-40 °C to +230 °C
-40 °C to +175 °C
-40 °C to +110 °C
-40 °C to +75 °C
-40 °C to +60 °C
Max. surface temperature 2)
+250 °C
+195 °C
+130 °C
+95 °C
+80 °C
Explanation:
The maximum surface temperatures each result from the maximum permissible ambient or operating temperature T a plus the maximum
temperature increase T of 20 K to be considered. For the temperature classes T6 to T3 (≤ 200 °C) a safety margin subject to standard of 5 K
and from temperature class T3 (≥ 200 °C) a safety margin subject to standard of 10 K is added.
1) The ambient or operating temperature Ta is limited to +250 °C due to the permissible permanent operating temperature (surface
temperature).
2) The maximum surface temperature of +230 °C applies for the use in locations which are potentially subject to dust explosion.
In potentially explosive atmospheres
• the ignition temperature of dusts generated must at least be 1.5 times the surface temperature to be
considered
• the glow temperature must at least be the surface temperature to be considered plus a safety distance of 75 K.
• the gases and vapours generated must amount to the temperature class specified.
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
10
KTR-N
Sheet:
Edition:
47411 EN
15 of 19
2
Enclosure A
Advice and instructions regarding the use in
10.1 Intended use in
potentially explosive atmospheres
potentially explosive atmospheres
2. Mining
Equipment group I of category M2 (coupling is not approved/not suitable for equipment group M1).
Permissible ambient temperature -40 °C to +130 °C.
10.2 Inspection intervals for couplings in
Equipment category
3G
3D
M2
2G
2D
No gases and vapours of
explosion group IIC
2G
2D
Gases and vapours of
explosion group IIC
potentially explosive atmospheres
Inspection intervals
For couplings operated in zone 2 or zone 22 the inspection and maintenance intervals of
the usual operating/assembly instructions for standard operation apply. During the
standard operation which has to be taken as a basis of the ignition risk analysis the
couplings are free from any ignition source. For gases, vapours and dusts generated the
permissible glow and ignition temperatures specified in chapter 10.1 have to be
considered and observed.
An inspection of the torsional backlash and a visual inspection of the laminae sets must
be performed after 3,000 operating hours for the first time, at the latest 6 months after
start-up of the coupling.
If you note insignificant or no wear on the lamina sets upon this initial inspection, further
inspections can each be performed after 6,000 operating hours or at the latest after 18
months, provided that the operating parameters remain the same.
If you note significant wear during the initial inspection so that it would be
recommendable to replace the laminae sets, find out the cause according to the table
„Breakdowns“, if possible.
The maintenance intervals must be adjusted to the modified operating parameters
without fail.
An inspection of the torsional backlash and a visual inspection of the laminae sets must
be performed after 2,000 operating hours for the first time, at the latest 3 months after
start-up of the coupling.
If you note insignificant or no wear on the lamina sets upon this initial inspection, further
inspections can each be performed after 4,000 operating hours or at the latest after 12
months, provided that the operating parameters remain the same.
If you note significant wear during the initial inspection so that it would be
recommendable to replace the laminae sets, find out the cause according to the table
„Breakdowns“, if possible.
The maintenance intervals must be adjusted to the modified operating parameters
without fail.
During the visual inspection the laminae sets must
be inspected for cracks and screws working loose.
Screws working loose must be tightened at the
screw tightening torque specified (consult with
KTR). If the laminae sets are damaged or have
cracks they must be replaced by a new coupling
immediately regardless of the inspection intervals.
Illustration 8: RIGIFLEX®-N, type A-H
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
10
KTR-N
Sheet:
Edition:
47411 EN
16 of 19
2
Enclosure A
Advice and instructions regarding the use in
10.3
potentially explosive atmospheres
marking of coupling for potentially explosive atmospheres
The explosion protection marking of the RIGIFLEX®-N coupling is applied on the outer sheath or on the front side.
The laminae sets are not marked.
For the complete marking refer to the operating/assembly instructions and/or the delivery note/package.
Marking is as follows:
• Marking for unpainted res. coated or painted couplings with a layer thickness < 200 µm
I M2
II 2G
II 2D
Ex h
I
Mb
Ex h
IIC T6
… T2
Gb
Ex h
IIIC T80 °C … T250 °C Db
<Year>
-40 °C ≤ Ta ≤ +60 °C … +230 °C
KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine
X
X
X
-40 °C ≤ Ta ≤ +130 °C
• Marking for painted couplings with a layer thickness of 0.2 mm to max. 2.0 mm
I M2
II 2G
II 2D
Ex h
I
Mb
Ex h
IIB T6
… T2
Gb
Ex h
IIIC T80 °C … T250 °C Db
<Year>
-40 °C ≤ Ta ≤ +60 °C … +230 °C
KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine
X
X
X
-40 °C ≤ Ta ≤ +130 °C
Short marking:
(A short marking is only made if not possible differently for reason of space or functioning.)
RIGIFLEX®-N
<Year>
Deviating marking applied until 31st October 2019:
Short marking:
II 2GD c IIC T X/I M2 c X
II 2G c IIC T6, T5, T4, T3 resp. T2 -30 °C  Ta  +75 °C, +90 °C,
+125 °C, +190 °C resp. +250 °C
II 2D c T 110 °C -30 °C  Ta  +100 °C /I M2 c -30 °C  Ta  +140 °C
Complete marking:
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
10
47411 EN
17 of 19
2
Enclosure A
Advice and instructions regarding the use in
10.3
KTR-N
Sheet:
Edition:
potentially explosive atmospheres
marking of coupling for potentially explosive atmospheres
Comments on marking
Equipment group I
Equipment group II
Equipment category 2G
Equipment category 2D
Equipment category M2
Mining
Non-mining
Equipment ensuring a high level of safety, suitable for zone 1
Equipment ensuring a high level of safety, suitable for zone 21
Equipment ensuring a high level of safety must be able to be switched off
when an explosive atmosphere occurs
D
Dust
G
Gases and vapours
Ex h
Nonelectrical explosion protection
IIB
Gases and vapours of class IIB (including IIA)
IIC
Gases and vapours of class IIC (including IIA and IIB)
IIIC
Electrically conductive dusts of class IIIC (including IIIA and IIIB)
T6 … T2
Temperature class to be considered, depending on the ambient temperature
T80 °C … T250 °C
Maximum surface temperature to be considered, depending on the ambient
temperature
-40 °C ≤ Ta ≤ +60 °C … +230 °C, Permissible ambient temperature from -40 °C to +60 °C resp.
-40 °C ≤ Ta ≤ +230 °C or
-40 °C to +230 °C or -40 °C to +130 °C
-40 °C ≤ Ta ≤ +130 °C
Gb, Db, Mb
Equipment protection level, analogous to the equipment category
X
For a safe use of the couplings particular conditions apply
Please observe protection
note ISO 16016.
Drawn:
Verified:
2022-07-06 Pz/Wb
2022-08-09 Pz
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
10
KTR-N
Sheet:
Edition:
47411 EN
18 of 19
2
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
10.4 EU Declaration of conformity
EU Declaration of Conformity resp.
Certificate of Conformity
corresponding to EU directive 2014/34/EU dated 26 February 2014
and to the legal regulations adopted for its implementation
The manufacturer - KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine - states that the
RIGIFLEX®-N Steel Lamina Couplings
in an explosion-proof design described in these assembly instructions are equipment resp.
components corresponding to article 2, 1. of directive 2014/34/EU and comply with the general safety
and health specifications according to enclosure II of directive 2014/34/EU.
This declaration of conformity is issued under the sole responsibility of the manufacturers
KTR Systems GmbH.
The coupling described in here complies with the specifications of the following standards/rules:
EN ISO 80079-36:2016-12
EN ISO 80079-37:2016-12
EN ISO/IEC 80079-38:2017-10
IEC/TS 60079-32-1:2020-01-24
The RIGIFLEX®-N is in accordance with the specifications of directive 2014/34/EU.
According to article 13 (1) b) ii) of directive 2014/34/EU the technical documentation is deposited with
the notified body (type examination certificate IBExU07ATEXB004 X):
IBExU
Institut für Sicherheitstechnik GmbH
Identification number: 0637
Fuchsmühlenweg 7
09599 Freiberg
Rheine,
Place
2022-07-06
Date
Please observe protection
note ISO 16016.
Drawn:
Verified:
i. V.
Reinhard Wibbeling
Engineering/R&D
2022-07-06 Pz/Wb
2022-08-09 Pz
i. V.
Reiner Banemann
Product Manager
Replacing:
Replaced by:
KTR-N dated 2019-06-24
RIGIFLEX®-N
Operating/Assembly instructions
Type A-H
10
KTR-N
Sheet:
Edition:
47411 EN
19 of 19
2
Enclosure A
Advice and instructions regarding the use in
potentially explosive atmospheres
10.5 UK Declaration of conformity
UK Declaration of Conformity resp.
Certificate of Conformity
corresponding to UK directive SI 2016 No. 1107 dated 26 February 2014
and to the legal provisions adopted for its implementation
The manufacturer - KTR Systems GmbH, Carl-Zeiss-Str. 25, D-48432 Rheine - states that the
RIGIFLEX®-N Steel Lamina Couplings
in an explosion-proof design described in these assembly instructions are equipment resp.
components corresponding to directive SI 2016 No. 1107 and comply with the general safety and
health requirements according to directive SI 2016 No. 1107.
This declaration of conformity resp. certificate of conformity is issued under the sole responsibility of
the manufacturer KTR Systems GmbH.
The coupling described in here complies with the specifications of the following standards/rules:
EN ISO 80079-36:2016-12
EN ISO 80079-37:2016-12
EN ISO/IEC 80079-38:2017-10
IEC/TS 60079-32-1:2020-01-24
The RIGIFLEX®-N is in accordance with the specifications respectively the applicable specifications of
directive SI 2016 No. 1107.
According to directive SI 2016 No. 1107 the technical documentation is deposited with the notified
body:
Eurofins CML
Identification number: 2503
Rheine,
Place
2022-07-06
Date
Please observe protection
note ISO 16016.
Drawn:
Verified:
i. V.
Reinhard Wibbeling
Engineering/R&D
2022-07-06 Pz/Wb
2022-08-09 Pz
i. V.
Reiner Banemann
Product Manager
Replacing:
Replaced by:
KTR-N dated 2019-06-24
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