SIST EN ISO 10441:2000
(Main)Petroleum and natural gas industries - Flexible couplings for mechanical power transmission - Special purpose applications (ISO 10441:1999)
Petroleum and natural gas industries - Flexible couplings for mechanical power transmission - Special purpose applications (ISO 10441:1999)
Erdöl- und Erdgasindustrie - Nachgiebige Kupplungen zur mechanischen Kraftübertragung - Besondere Anwendungsfälle (ISO 10441:1999)
Industries du pétrole et du gaz naturel - Accouplements flexibles pour transmission de puissance mécanique - Applications spéciales (ISO 10441:1999)
Petroleum and natural gas industries - Flexible couplings for mechanical power transmission - Special purpose applications (ISO 10441:1999)
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 10441:2000
01-december-2000
Petroleum and natural gas industries - Flexible couplings for mechanical power
transmission - Special purpose applications (ISO 10441:1999)
Petroleum and natural gas industries - Flexible couplings for mechanical power
transmission - Special purpose applications (ISO 10441:1999)
Erdöl- und Erdgasindustrie - Nachgiebige Kupplungen zur mechanischen
Kraftübertragung - Besondere Anwendungsfälle (ISO 10441:1999)
Industries du pétrole et du gaz naturel - Accouplements flexibles pour transmission de
puissance mécanique - Applications spéciales (ISO 10441:1999)
Ta slovenski standard je istoveten z: EN ISO 10441:1999
ICS:
21.120.20 Sklopke Couplings
75.180.20 Predelovalna oprema Processing equipment
SIST EN ISO 10441:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 10441:2000
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SIST EN ISO 10441:2000
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SIST EN ISO 10441:2000
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SIST EN ISO 10441:2000
INTERNATIONAL ISO
STANDARD 10441
First edition
1999-03-15
Petroleum and natural gas industries —
Flexible couplings for mechanical power
transmission — Special purpose
applications
Industries du pétrole et du gaz naturel — Accouplements flexibles pour
transmission de puissance mécanique — Applications spéciales
A
Reference number
ISO 10441:1999(E)
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SIST EN ISO 10441:2000
ISO 10441:1999(E)
Contents
Page
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Statutory requirements .9
5 Coupling duty.9
6 Coupling rating and selection .11
7 Requirements for all couplings .12
7.1 General.12
7.2 Idling adapters / moment simulators.13
7.3 Coupling hubs.13
7.4 Bolting.14
7.5 Electrical insulation.15
7.6 Alignment provision .15
7.7 Rotor dynamics data .15
7.8 Torque measurement .15
7.9 Non-horizontal applications .15
8 Additional requirements for gear couplings.15
9 Additional requirements for metallic flexible-element couplings.16
10 Additional requirements for quill-shaft couplings .17
11 Additional requirements for torsionally resilient couplings .17
12 Balance .18
12.1 Objectives.18
12.2 Balance quality.18
© ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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SIST EN ISO 10441:2000
© ISO
ISO 10441:1999(E)
12.3 Additional balancing requirements . 19
12.4 Verification of coupling balance . 19
13 Materials . 20
14 Accessories. 21
14.1 Guards . 21
14.2 Maintenance equipment. 21
15 Manufacturing quality, inspection, testing and preparation for shipment . 21
15.1 Manufacturing quality . 21
15.2 Inspection and testing. 21
15.3 Preparation for shipment. 23
16 Vendor’s data . 23
16.1 General . 23
16.2 Proposals . 23
16.3 Contract data. 24
16.4 Coordination meeting. 26
Annex A (informative) Data sheet. 27
Annex B (informative) Example determination of potential unbalance . 30
Annex C (informative) Types of misalignment . 33
Bibliography. 35
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SIST EN ISO 10441:2000
© ISO
ISO 10441:1999(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 10441 was prepared by Technical Committee TC 67, Materials, equipment and offshore
structures for petroleum and natural gas industries, Subcommittee SC 6, Processing equipment and systems.
Annexes A, B and C of this International Standard are for information only.
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SIST EN ISO 10441:2000
© ISO
ISO 10441:1999(E)
Introduction
This International Standard is based on the accumulated knowledge and experience of manufacturers and users of
power transmission couplings used to couple large or critical machines in the petroleum and natural gas industries,
but its use is not restricted to these industries.
This International Standard has been derived from the American Petroleum Institute, standard 671 but contains
significant differences from that standard.
Users of this International Standard should be aware that further or differing requirements may be needed for
individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser
from accepting, alternative equipment or engineering solutions for the individual application. This may be particularly
appropriate where there is innovative or developing technology. Where an alternative is offered, the vendor should
identify any variations from this International Standard and provide details.
This International Standard requires the purchaser to specify certain details and features.
A bullet (•) at the beginning of a clause, subclause or paragraph indicates that either a decision is required or further
information is to be provided by the purchaser. This information or decision should be indicated on the data sheets;
otherwise it should be stated in the quotation request (enquiry) or in the order.
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SIST EN ISO 10441:2000
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SIST EN ISO 10441:2000
INTERNATIONAL STANDARD © ISO ISO 10441:1999(E)
Petroleum and natural gas industries — Flexible couplings for
mechanical power transmission — Special purpose applications
1 Scope
1.1 This International Standard specifies the requirements for couplings for the transmission of power between the
rotating shafts of two machines for service in special purpose applications in the petroleum and natural gas
industries. Such applications will typically be in large and/or high speed machines in services that may be required
to operate continuously for extended periods, are often unspared and are critical to the continued operation of the
installation. By agreement, it may be used to apply to other services.
NOTE Couplings for general purpose, less critical applications are covered in ISO 14691.
1.2 Couplings covered by this International Standard are designed to accommodate parallel (or lateral) offset,
angular misalignment and axial displacement of the shafts without imposing unacceptable mechanical loading on
the coupled machines. It is applicable to gear, metallic flexible-element, quillshaft and torsionally resilient-type
couplings. It is not applicable to other types, such as clutch, hydraulic, eddy-current, rigid, radial spline, chain and
bellows types.
1.3 This International Standard is applicable to the design, materials of construction, manufacturing quality,
inspection and testing of couplings. It does not include criteria for the selection of coupling types for specific
applications.
NOTE It is strongly recommended that, when users fit new couplings to existing equipment, which are different from those
originally fitted, they consult the vendor who originally had unit responsibilty for the equipment train, to ensure proper
application of this International Standard. It will generally be necessary to recalculate the rotor dynamics of the train.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO
maintain registers of currently valid International Standards.
ISO 1940-1:1986, Mechanical vibration — Balance quality requirements of rigid rotors — Part. 1: Determination of
permissible residual unbalance.
ISO 8821, Mechanical vibration — Balancing — Shaft and fitment key convention.
ISO 14691, Petroleum and natural gas industries — Flexible couplings for mechanical power transmission —
General purpose applications.
1
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SIST EN ISO 10441:2000
© ISO
ISO 10441:1999(E)
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1 Terms relating to coupling types
3.1.1
mechanical contact coupling
coupling designed to transmit torque by direct mechanical contact between mating parts and accommodate
misalignment and axial displacement by relative rocking and sliding motion between the parts in contact
NOTE The contacting parts may be metallic or may be made of self-lubricating nonmetallic material.
3.1.1.1
gear coupling
type of mechanical contact coupling designed to transmit torque and accommodate misalignment and axial
displacement by relative rocking and sliding motion between mating internal and external profiled gears
3.1.2
metallic flexible-element coupling
coupling that obtains its flexibility from the flexing of thin metallic discs, diaphragms or links
3.1.2.1
metallic diaphragm coupling
type of metallic flexible-element coupling consisting of one or more metallic flexible elements in the form of thin
circular plates that are attached to one part of the coupling at their outer diameter and the other part at their inner
diameter
3.1.2.2
metallic disc coupling
type of metallic flexible-element coupling consisting of one or more metallic flexible elements that are alternately
attached to the two parts of the coupling, the attachment points being essentially equidistant from the centreline
3.1.3
elastomeric flexible-element coupling
coupling in which the torque is transmitted through one or several elastomeric elements
3.1.3.1
elastomeric shear coupling
type of elastomeric flexible-element coupling in which the torque is transmitted through an elastomeric element
which is principally loaded in shear
NOTE 1 The element may be in the form of a tyre, a bellows (with one or more convolutions) or a diaphragm.
NOTE 2 A single such elastomeric element is usually able to accommodate angular misalignment, parallel offset and axial
displacement.
3.1.3.2
elastomeric compression coupling
type of elastomeric flexible-element coupling in which elastomeric inserts are located between adjacent parts of the
driving and driven halves of the coupling and are principally loaded in compression
NOTE 1 The inserts are often in the form of bushes or wedges, or one single insert.
NOTE 2 The ability of such couplings to accommodate misalignment, particularly of the parallel (or lateral) offset type, is
limited.
3.1.4
double-engagement coupling
coupling with two planes of flexure
NOTE This arrangement enables couplings of certain types, notably gear and metallic flexible-element types, which cannot
normally accommodate parallel (or lateral) offset, to do so.
2
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SIST EN ISO 10441:2000
© ISO
ISO 10441:1999(E)
3.1.5
quill-shaft coupling
coupling designed to accommodate angular misalignment, parallel (or lateral) offset and torsional fluctuations by
elastic deformation of a relatively long slender shaft
NOTE Quill-shaft couplings cannot normally accommodate axial displacement.
3.1.6
single-engagement coupling
coupling with only one plane of flexure
NOTE Single-engagement couplings of some types, notably gear and metallic flexible-element types, will not normally
accommodate parallel (or lateral) offset.
3.1.7
torsionally resilient coupling
flexible coupling incorporating increased torsional flexibility and/or torsional damping
NOTE A torsionally resilient coupling may or may not also be designed to accommodate misalignment and/or axial
displacement.
3.2 Terms relating to coupling rating
3.2.1
coupling continuous rated torque
T
c
the coupling manufacturer's declared maximum torque which the coupling will transmit continuously, for unlimited
periods
NOTE 1 The coupling continuous rated torque is expressed as either:
a single value at the coupling rated speed, when simultaneously subjected to the coupling rated maximum continuous
angular misalignment (at each plane of flexure) and the coupling rated maximum continuous axial displacement,
or a range of values expressed as an interrelated function of speed, misalignment and axial displacement.
NOTE 2 For certain types of coupling, particularly those with elastomeric elements or inserts, the coupling continuous rated
torque may also be a function of the operating temperature.
3.2.2
coupling rated maximum continuous angular misalignment
maximum angular misalignment, at each plane of flexure, which the coupling is able to tolerate continuously for
unlimited periods
NOTE It is expressed as either:
a single value when transmitting the coupling continuous rated torque at the coupling rated speed, and simultaneously
subjected to the coupling rated maximum continuous axial displacement
or a range of values expressed as an interrelated function of speed, torque and axial displacement.
3.2.3
coupling rated maximum continuous axial displacement
maximum axial displacement the coupling is able to tolerate continuously for unlimited periods
NOTE It is expressed as either:
a single value when transmitting the coupling continuous rated torque at the coupling rated speed, and simultaneously
subjected to the coupling rated maximum continuous angular misalignment
or a range of values expressed as an interrelated function of speed, torque and angular misalignment.
3
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SIST EN ISO 10441:2000
© ISO
ISO 10441:1999(E)
3.2.4
coupling rated speed
maximum rotational speed at which the coupling is capable of continuously transmitting the coupling continuous
rated torque when simultaneously subjected to the coupling rated maximum continuous angular misalignment and
the coupling rated maximum continuous axial displacement
3.2.5
maximum allowable speed
highest rotational speed at which the coupling design will permit transient operation
3.2.6
maximum allowable temperature
maximum ambient temperature in the immediate vicinity of the coupling for which the manufacturer has designed
the coupling
3.3 Terms relating to coupling duty
3.3.1
application factor
K
a
factor by which the machine rated torque is multiplied to allow for the fact that the torque required to be transmitted
with certain types of driving or driven machines is not constant but varies in a cyclic manner
NOTE Examples of such machines are reciprocating engines or compressors.
3.3.2
experience factor
K
e
factor by which the machine rated torque is increased to allow for uncertainties in the determination of the machine
rated torque and possible future changes to the application
3.3.3
machine rated speed
highest rotational speed at which the machine rated torque is required to be transmitted continuously by the
coupling
3.3.4
machine rated torque
T
m
maximum mean torque required to be transmitted continuously by the coupling
NOTE Mean torque is the average torque over a few revolutions and does not include cyclic variations such as those
associated with reciprocating machines.
3.3.5
maximum continuous speed
maximum rotational speed at which the coupling is required to operate continuously but not necessarily transmitting
the machine rated torque
NOTE In most cases the machine rated speed and the maximum continuous speed are the same. In some applications,
however, the coupling may be required to operate at speeds above the speed at which it is required to transmit its rated torque.
3.3.6
maximum continuous temperature
maximum ambient temperature in the immediate vicinity of the coupling, at which the coupling will be required to
continuously transmit the coupling continuous rated torque at the specified operating conditions of speed and
misalignment
3.3.7
minimum continuous speed
lowest rotational speed at which the coupling is required to operate continuously
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SIST EN ISO 10441:2000
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ISO 10441:1999(E)
3.3.8
minimum operating temperature
lowest ambient temperature in the immediate vicinity of the coupling, at which the coupling is required to transmit
torque and/or accommodate misalignment or axial displacement
3.3.9
trip speed
rotational speed of the coupling corresponding to the speed at which the independent emergency overspeed device
operates to shut down a variable speed prime mover
NOTE Where the term is used in relation to a machine train driven by a constant-speed, alternating-current electric motor,
the trip speed is assumed to be the coupling speed corresponding to the motor synchronous speed at the maximum supply
frequency.
3.4 General terms
3.4.1
angular misalignment
minor angle between the centrelines of two shafts that intersect at a point or, where the shafts do not intersect, the
minor angle between the centreline of one shaft and an intersecting line parallel to the centreline of the other shaft
See Figure C.2.
NOTE With double-engagement couplings, the term also applies to the minor angle between the centreline of one shaft
and the effective centreline of the (3.4.8).
floating shaft
3.4.2
axial displacement
change in the relative axial position of the adjacent shaft ends of two coupled machines
3.4.3
axial reference point
axial position on the shaft of the driving or driven machine (normally the extreme end of the shaft) from which axial
distance is measured
3.4.4
coupling axial reaction force
axial force developed within the coupling which results from the imposed operating conditions
NOTE 1 Axial deflection, misalignment, speed, temperature, etc. are examples of imposed operating conditions.
NOTE 2 Coupling axial reaction force is a function of the shape and stiffness of the flexible elements or the sliding friction
between the elements of a mechanical contact coupling.
3.4.5
coupling mass simulator
auxiliary device designed to correctly simulate both the effective mass and the effective location of the centre of
mass of a half-coupling with respect to the shaft on which it is mounted
3.4.6
electrically insulated coupling
coupling designed to prevent the flow of electrical current from one shaft to the other through the coupling
3.4.7
flexing length
axial distance between the effective planes of flexure of a double-engagement coupling
3.4.8
floating shaft
floating part, or assembly, of a double-engagement coupling that connects, and is flexibly supported from, the shaft-
mounted assemblies and through which the power is transmitted
NOTE The floating shaft may include the spacer or may be only part of the spacer.
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SIST EN ISO 10441:2000
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ISO 10441:1999(E)
3.4.9
half-coupling
composite of all the components of the coupling attached to and supported from one shaft, including an appropriate
portion of the spacer assembly in the case of a double-engagement coupling or of the flexing elements of a single-
engagement coupling
3.4.10
hub
part of a coupling mounted directly onto the shaft of the driving or driven machine
3.4.11
idling adapter
solo plate
device designed to rigidly hold in alignment the floating parts at the drive end of certain types of coupling, to allow
uncoupled operation of the driving machine without dismounting the coupling hub
3.4.12
lateral offset
lateral distance between the centrelines of two coupled shafts that are not parallel, measured at the axial reference
point of the driving machine shaft
See Figures C.3 and C.4.
3.4.13
limited-end-float coupling
coupling designed to limit the axial movement of the coupled shaft ends with respect to each other and transmit an
axial force of a prescribed magnitude
3.4.14
manufacturer
body responsible for the design and manufacture of the coupling
NOTE The manufacturer is not necessarily the vendor.
3.4.15
moment simulator
auxiliary device designed to simulate the effective moment of the mass of a half-coupling with respect to the centre
of the adjacent bearing
3.4.16
parallel offset
lateral distance between the centrelines of two coupled shafts that are parallel but not in the same straight line
See Figure C.1.
3.4.17
potential unbalance
maximum probable net unbalance of a complete coupling after installation
NOTE 1 Potential unbalance results from a combination of the residual unbalance of individual components and
subassemblies and possible eccentricity of the components and subassemblies due to run-out and tolerances of the various
locating surfaces and registers. Since it may be assumed that the actual values of the various contributory unbalances are
random in both magnitude and direction, the numerical value of the potential unbalance is the square root of the sum of the
squares of the maximum likely values of all the contributory unbalances. Typical contributory unbalances are:
the measured residual unbalance of each component or subassembly;
errors in the balance of each component or subassembly resulting from eccentricity in the fixture used to mount the
component or subassembly in the balancing machine;
the unbalance of each component or subassembly due to eccentricity resulting from clearance or run-out of the relevant
registers or fits.
NOTE 2 The concept of potential unbalance is explained more fully and a worked example is given in annex B.
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SIST EN ISO 10441:2000
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ISO 10441:1999(E)
3.4.18
purchaser
body that issues the order and the specification for the coupling to the vendor
NOTE The purchaser may be the end user, the end user’s agent or the vendor of the driving or driven machine.
3.4.19
residual unbalance
level of unbalance remaining in a component or assembly after it has been balanced, either to the limit of the
capability of the balancing machine or in accordance with the relevant standard
3.4.20
shaft-mounted assembly
total assembly of parts rigidly connected to the shaft of the driving or driven machine
NOTE This includes the hub, where supplied, and all other components up to the flexible element(s) of a metallic or
elastomeric flexible-element coupling or one of the pair of contacting parts in a mechanical contact type coupling.
3.4.21
spacer
that part of a coupling that is removable to provide space and give access for the use of tools to remove the
coupling hubs or for other purposes
NOTE The spacer may be a single component or an assembly.
3.4.22
spacer gap length
axial length of the free gap, after the removal of the spacer, that is available for the use of tools to remove the hubs
or for other purposes
NOTE Spacer gap length may be less than the distance between the shaft ends.
3.4.23
torsional damping
absorption or dissipation of oscillatory rotary energy
NOTE Torsional damping may be necessary to limit the build-up of transient or steady-state torsional resonant oscillations
in a system.
3.4.24
torsional natural frequency
natural rotational oscillatory frequency of a system composed of rota
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