prEN ISO 15783

SLOVENSKI STANDARD
01-julij-2025
Centrifugalne črpalke brez tesnila (hermetične črpalke) - Razred II - Specifikacija
(ISO/DIS 15783:2025)
Seal-less rotodynamic pumps - Class II - Specification (ISO/DIS 15783:2025)
Dichtungslose rotodynamische Pumpen - Klasse II - Spezifikation (ISO/DIS 15783:2025)
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre Classe II - Spécifications
(ISO/DIS 15783:2025)
Ta slovenski standard je istoveten z: prEN ISO 15783
ICS:
23.080 Črpalke Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 15783
ISO/TC 115/SC 1
Seal-less rotodynamic pumps —
Secretariat: BSI
Class II — Specification
Voting begins on:
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre —
2025-04-15
Classe II — Spécifications
Voting terminates on:
ICS: 23.080 2025-07-08
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
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USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
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WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 15783:2025(en)
DRAFT
ISO/DIS 15783:2025(en)
International
Standard
ISO/DIS 15783
ISO/TC 115/SC 1
Seal-less rotodynamic pumps —
Secretariat: BSI
Class II — Specification
Voting begins on:
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre —
Classe II — Spécifications
Voting terminates on:
ICS: 23.080
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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NOTIFICATION OF ANY RELEVANT PATENT
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Published in Switzerland Reference number
ISO/DIS 15783:2025(en)
ii
ISO/DIS 15783:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Design . 7
4.1 General .7
4.1.1 Characteristic curve .7
4.1.2 Net Positive Suction Head (NPSH) .7
4.1.3 Outdoor installation .7
4.2 Prime movers .7
4.2.1 General .7
4.2.2 Magnetic drive pumps .8
4.2.3 Canned motor pumps .8
4.3 Critical speed, balancing and vibrations .9
4.3.1 Critical speed .9
4.3.2 Balancing and vibration .10
4.4 Pressure-containing parts .10
4.4.1 Primary containment .10
4.4.2 Secondary containment .11
4.4.3 Secondary control .11
4.4.4 Pressure-temperature rating . .11
4.4.5 Wall thickness .11
4.4.6 Materials . 12
4.4.7 Mechanical features . 12
4.5 Branches, nozzles and miscellaneous connections . 13
4.5.1 Extent . 13
4.5.2 Inlet and outlet branches . 13
4.5.3 Venting and draining . 13
4.5.4 Pressure gauge connections . 13
4.5.5 Closures . 13
4.5.6 Auxiliary pipe connections . 13
4.5.7 Connection identification .14
4.6 External forces and moments on flanges (inlet and outlet) .14
4.7 Branch (nozzle) flanges.14
4.8 Impellers .14
4.8.1 Impeller design .14
4.8.2 Securing of impellers .14
4.9 Wear rings or equivalent components .14
4.10 Running clearance .14
4.11 Shafts . 15
4.11.1 General . 15
4.11.2 Surface roughness . 15
4.12 Bearings . 15
4.12.1 General . 15
4.12.2 Rolling bearing life . 15
4.12.3 Bearing temperature . 15
4.12.4 Lubrication . 15
4.12.5 Bearing housing design for magnetic drive pumps . 15
4.12.6 Sleeve and thrust bearings for the pump shaft .16
4.13 Circulation flow .16
4.13.1 General .16
4.13.2 Circulation plans .16
4.13.3 Magnetic drives .16

iii
ISO/DIS 15783:2025(en)
4.13.4 Canned motor .16
4.14 Nameplates .17
4.15 Direction of rotation .17
4.16 Couplings for magnetic drive pumps .17
4.17 Baseplate .18
4.17.1 General .18
4.17.2 Non-grouted baseplates .18
4.17.3 Grouted baseplates .18
4.17.4 Assembly of magnetic drive pump and driver on baseplate .18
4.17.5 Tools .18
4.18 Monitoring .18
5 Materials . 19
5.1 Selection of materials .19
5.2 Material composition and quality .19
5.3 Repairs .19
6 Testing. 19
6.1 General .19
6.2 Material tests . 20
6.3 Pump test and inspection . 20
6.3.1 Hydrostatic test . 20
6.3.2 Hermetic integrity test (optional) .21
6.3.3 Mechanical integrity (optional) .21
6.3.4 Performance test (optional) . 22
6.3.5 Canned motor test . 22
6.3.6 Inspection of components . 22
6.3.7 Final inspection . 23
7 Preparation for despatch .23
7.1 Surface protection . 23
7.2 Securing of rotating parts for transport . 23
7.3 Openings . 23
7.4 Pipes and auxiliaries . 23
7.5 Identification . 23
8 Information for use .23
Annex A (normative) Data sheet for magnetic drive pumps and canned motor pumps .25
Annex B (informative) External forces and moments on flanges .30
Annex C (informative) Enquiry, proposal and purchase order .31
Annex D (informative) Documentation after purchase order .32
Annex E (informative) Typical circulation piping plans and characteristics for canned motor
pumps and magnetic drive pumps .33
Annex F (informative) Internationally accepted materials for pump parts .39
Annex G (informative) Checklist . 51
Bibliography .53

iv
ISO/DIS 15783:2025(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO [had/had not] received notice of
(a) patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 115, Pumps, Subcommittee SC 1, Dimensions
and technical specifications of pumps.
This second edition cancels and replaces the first edition (ISO 15783:2002), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Normative references were extensively revised. Some references have been updated.
— Liquid properties were added in 4.2.1.
— Definition of rigid support added in Note of table 1.
— The following description added in 6.3.1.2
— Annex F was extensively revised. Hastelloy alloy was also added to Table F1.
— 4.13.1 and 4.13.3 paragraphs were added to informative Annex G;
— Bibliography was extensively revised.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
ISO/DIS 15783:2025(en)
Introduction
This International Standard is the first of a series dealing with technical specifications for seal-less pumps;
they correspond to two classes of technical specifications, Classes I and II, of which Class I is the more severe
requirements.
Where a decision may be required by the purchaser, or agreement is required between the purchaser and
manufacturer/supplier, the relevant text is highlighted with * and is listed in annex G.

vi
DRAFT International Standard ISO/DIS 15783:2025(en)
Seal-less rotodynamic pumps — Class II — Specification
1 Scope
1.1 This International Standard specifies the requirements for seal-less rotodynamic pumps that are
driven with permanent magnet coupling (magnet drive pumps) or with canned motor, and which are mainly
used in chemical processes, water treatment and petrochemical industries. Their use can be dictated by
space, noise, environment or safety regulations.
Seal-less pumps are pumps where an inner rotor is completely contained in a pressure vessel holding the
pumped fluid. The pressure vessel or primary containment device is sealed by static seals such as gaskets or
O-rings.
1.2 Pumps will normally to recognized standard specifications (e.g. ISO 5199, explosion protection,
electromagnetic compatibility), except where special requirements are specified herein.
1.3 This International Standard includes design features concerned with installation, maintenance and
operational safety of the pumps, and defines those items to be agreed upon between the purchaser and
manufacturer/supplier.
1.4 Where conformity to this International Standard has been requested and calls for a specific design
feature, alternative designs may be offered providing that they satisfy the intent of this International
Standard and they are described in detail. Pumps which do not conform with all requirements of this
International Standard may also be offered providing that the deviations are fully identified and described.
Whenever documents include contradictory requirements, they should be applied in the following sequence
of priority:
a) purchase order (or inquiry, if no order placed), see annexes C and D;
b) data sheet (see annex A) or technical sheet or specification;
c) this International Standard;
d) other standards.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 76, Rolling bearings — Static load ratings
ISO 281, Rolling bearings — Dynamic load ratings and rating life
1)
ISO 3274 , Geometrical Product Specifications (GPS) — Surface texture: Profile method — Nominal
characteristics of contact (stylus) instruments
ISO 3744, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Engineering methods for an essentially free field over a reflecting plane
1) This standard will be replaced by ISO/FDIS 25178-601

ISO/DIS 15783:2025(en)
ISO 3746, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound
pressure — Survey method using an enveloping measurement surface over a reflecting plane
ISO 5199, Technical specifications for centrifugal pumps — Class II
ISO 7005-1, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 7005-2, Metallic flanges — Part 2: Cast iron flanges
ISO 7005-3, Metallic flanges — Part 3: Copper alloy and composite flanges
ISO 9906, Rotodynamic pumps — Hydraulic performance acceptance tests — Grades 1, 2 and 3
IEC 60034-1, Rotating electrical machines — Part 1: Rating and performance
EN 12162, Liquid pumps — Safety requirements — Procedure for hydrostatic testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Magnetic drive pump
MDP
pump in which the shaft power of the drive is transferred to the impeller of the pump by means of a
permanent magnetic field, which passes through a containment barrier (shell) to an inner rotor having
permanent magnets or an induction device.
3.2
Canned motor pump
CMP
pump in which the stator of an electric motor is separated from the rotor by a sealed containment barrier
(liner).
Note 1 to entry: The rotor runs in the liquid being pumped or in another liquid.
Note 2 to entry: The shaft power is transmitted by means of an electromagnetic field.
3.3
Seal-less rotodynamic pump
pump design in which the impeller shaft also carries the rotor of either a canned induction motor
or a synchronous or an asynchronous magnetic drive.
Note 1 to entry: The design does not use a dynamic shaft seal as a primary containment device. Static seals are the
means used for containing the fluid.
3.3.1
Hydraulic end
that end of the pump which transfers mechanical energy into the liquid being pumped.
3.3.2
Power drive end
that end of the pump containing the magnetic coupling (MDP) or the motor (CMP) which provides the
mechanical energy necessary for the operation of the hydraulic end.

ISO/DIS 15783:2025(en)
3.3.3
Lubrication and cooling flow
flow necessary in a magnetic drive in the area between the inner magnet and the containment shell, or in
a canned motor between the rotor and the sleeve, for dissipation of the heat due to inherent eddy current
losses in metallic containment shells and frictional heat generation from bearings, and for lubrication.
Note 1 to entry: Internal pump bearings are lubricated and cooled by the pumped fluid or an external, compatible
flushing fluid.
3.3.4
Close coupled
coupling arrangement in which the motor is supplied with a flange adapter which mounts directly
onto the casing or body of the pump and in which the outer magnet ring is mounted onto the motor shaft.
3.3.5
Separately coupled
arrangement in which the motor and pump have separate mounting arrangements with the outer
magnet ring mounted on its own shaft, supported by rolling bearings, and connected to the motor shaft by
means of a flexible coupling.
3.3.6
Air gap
radial distance between the inner diameter (ID) of the outer magnet assembly and the outer diameter
(OD) of the containment shell.
3.3.7
liquid gap
radial distance between the ID of the shell and the OD of the rotor sheath.
3.3.8
liquid gap
radial distance between the ID of the liner and the OD of the rotor sheath.
3.3.9
total gap
magnetic gap
>MDP< radial distance between the ID of the outer magnets and the OD of the inner magnets/torque ring.
3.3.10
total gap
Canned motor pump
total distance between the ID of the stator laminations and the OD of the rotor lamination.
3.3.11
radial load
load perpendicular to the pump shaft and drive shaft due to unbalanced hydraulic loading
on the impeller, mechanical and magnetic rotor unbalance, rotor assembly weight, and forces of the fluid
circulating through the drive.
3.3.12
axial load
load in line with the pump shaft caused by hydraulic forces acting on the impeller shrouds and inner
magnet assembly.
3.3.13
axial load
load in line with the pump shaft caused by hydraulic forces acting on the impeller shrouds and rotor.

ISO/DIS 15783:2025(en)
3.3.14
hydraulic load balance
axial load equalization by means of an impeller design, impeller balance holes or vanes, or by balancing
through variable orifices in the drive section and hydraulics.
3.4
starting torque
maximum net torque transmitted to the driven components during a hard (full voltage) start-up of the unit.
Note 1 to entry: It is affected by the inertia of the pump and motor rotors, the starting torque capacity of the motor
and the power versus speed requirements of the liquid end.
3.5
break-out torque
torque load applied to the drive shaft with the rotor locked at the point at which magnetic decoupling occurs.
3.6
locked rotor torque
maximum torque that a motor will develop when prevented from turning.
3.7
magnetic coupling
device which transmits torque through the use of magnet(s) attached to the drive and driven shafts.
3.8
inner magnet ring
rows of magnets operating within the containment shell, driven by the outer magnet ring.
Note 1 to entry: The inner magnet ring is mounted on the same rotating element as the pump impeller.
3.9
outer magnet ring
rows of permanent magnets securely fixed to a carrier, evenly spaced to provide a uniform magnetic field.
Note 1 to entry: outer magnet ring, while rotating, transmits power through a containment shell, driving the inner
magnet ring or torque ring.
3.10
Eddy currents
3.10.1
eddy current drive
asynchronous magnetic coupling consisting of a permanent outer magnet ring and an inner torque ring
containing a network of conductive rods supported on a mild steel core.
Note 1 to entry: The rotating outer magnet ring generates eddy currents in the copper rods which convert the core to
an electromagnet. The electromagnet follows the rotating outer magnet ring but at a slightly slower speed due to slip.
3.10.2
eddy current loss
power loss resulting from eddy currents.
Note 1 to entry: The energy in these eddy currents is normally dissipated as heat due to the electrical resistance of the
material.
3.10.3
torque ring
laminations and conductors mounted on the rotor in which electric currents are induced in an eddy
current drive.
ISO/DIS 15783:2025(en)
3.10.4
decouple
failure of a synchronous magnetic coupling to rotate synchronously, or the stall condition of an eddy
current drive.
3.10.5
slip
speed differential between the torque ring and outer magnet ring in an eddy current drive pump or between
the running speed and the synchronous speed in a CMP.
3.10.6
demagnetization
permanent loss of magnetic attraction due to temperature or modification of the field.
3.11
Containment
3.11.1
sheath
thin-walled hermetically sealed enclosure fitted to the inner rotor enclosing the inner magnet ring (MDP) or
rotor laminations (CMP).
Note 1 to entry: See Figures 1 and 2.
3.11.2
shell
hermetically sealed enclosure fitted within the total-gap between the inner and outer magnet rings of an
MDP and which provides for the primary containment of the pumped liquid.
Note 1 to entry: See Figure 2.
3.11.3
liner
hermetically sealed enclosure fitted to the ID of the stator assembly of a CMP and providing for the primary
containment of the pumped liquid.
Note 1 to entry: See Figure 1.
3.11.4
secondary containment
backup pressure-containing system using static seals only to contain leakage in the event of failure of the
primary containment by shell or by liner, and including provisions to indicate a failure of the containment
shell or liner.
3.11.5
drive shaft
outer shaft of the magnetic drive coupling.
3.11.6
secondary control
minimization of release of pumped liquid in the event of failure of the containment shell or stator liner
3.11.7
secondary control system
combination of devices (including, for example, a secondary pressure casing, a mechanical seal) that, in
the event of leakage from the containment shell or stator liner, minimizes and safely directs the release of
pumped liquid.
Note 1 to entry: It includes provision(s) to indicate a failure of the containment shell or liner.

ISO/DIS 15783:2025(en)
Key
1 hydraulic end 5 stator assembly
2 bearing 6 rotor sheath
3 liner 7 rotor
4 terminal box
Figure 1 — Example of a canned motor pump (CMP)
Key
1 hydraulic end 6 coupling
2 bearing 7 prime mover
3 shell 8 baseplate
4 bearing housing 9 sheath: inner magnet ring
5 rolling bearing 10 outer magnet ring
Figure 2 — Example of a magnetic drive pump (MDP)

ISO/DIS 15783:2025(en)
4 Design
4.1 General
4.1.1 Characteristic curve
The characteristic curve shall indicate the permitted operating range of the pump. Pumps should have a
stable characteristic curve. In addition, the characteristic curves for the smallest and largest impeller
diameters shall also be shown.
Minimum and maximum continuous stable flows at which the pump can operate without exceeding the
noise, vibration and temperature limits imposed by this International Standard shall clearly be stated by the
manufacturer/supplier.
4.1.2 Net Positive Suction Head (NPSH)
* The NPSH required (NPSHR) shall be based on cold water testing as determined by testing in accordance
with ISO 9906 unless otherwise agreed.
The manufacturer/supplier shall make available a typical curve as a function of flow for water. NPSHR
curves shall be based upon a head drop of 3 % (NPSH3).
Correction factors for hydrocarbons shall not be applied to the NPSHR curves.
Pumps shall be selected such that the minimum NPSH available (NPSHA) in the installation exceeds the
NPSHR of the pump by at least the specified safety margin. This safety margin shall be not less than 0,5 m,
but the manufacturer/supplier may specify a significantly higher margin depending on factors including the
following:
— size, type, specific speed, hydraulic geometry or design of the pump;
— operating speed or inlet velocity;
— the pumped liquid and temperature;
— the cavitation erosion resistance of the construction materials.
4.1.3 Outdoor installation
The pumps shall be suitable for outdoor installation under normal ambient conditions.
* Local regulations or extraordinary ambient conditions, such as high or low temperatures, corrosive
environment, sandstorms, for which the pump is required to be suitable shall be specified by the purchaser.
4.2 Prime movers
4.2.1 General
The following shall be considered when determining the power/speed requirements of the pump.
a) The application and method of operation of the pump. For example, in an installation intended for
parallel operation, the possible performance range with only one pump in operation, taking into account
the system characteristic.
b) The position of the operating point on the pump characteristic curve.
c) The circulation flow for lubrication of bearings and removal of heat losses (especially for pumps with
low rates of flow).
d) Properties of the pumped liquid (viscosity, solids content, density, specific heat, vapour pressure).

ISO/DIS 15783:2025(en)
e) Power loss, including slip loss through transmission (only magnet drive pumps).
f) Atmospheric conditions at the pump site.
g) Starting method of the pump:
— if a pump (e.g., a stand-by pump) is started automatically then consideration shall be given to whether
the pump may start against a closed valve, or whether the pump may start against an open valve
or be pumping into an empty pipeline; i.e. operates within a pumping system in which the pump
pressure is provided only for pipeline friction losses.
h) For variable speed arrangements the minimum continuous speed shall be indicated by the manufacturer/
supplier to ensure proper cooling and lubrication of the bearings.
Prime movers required as drivers for seal-less pumps covered by this International Standard shall have
power output ratings at least equal to the percentage of rated power input given in Figure 3, this value never
being less than 1 kW.
Where it appears that this will lead to unnecessary oversizing of the driver, an alternative proposal shall be
submitted for the purchaser's approval.
4.2.2 Magnetic drive pumps
When determining the permanent magnetic drive to be used, the following points shall be taken into
consideration in addition to the points a) to h) listed under 4.2.1.
a) The magnetic drive shall be selected for the allowed operating range with the selected impeller diameter
at operating temperature and taking into consideration the characteristics of the liquid to be pumped.
* If the density of the liquid of the normal operation is below 1 000 kg/m3 special agreements between the
manufacturer/supplier and purchaser for testing and cleaning shall be made.
b) Heat generated by eddy current losses, power losses in the shell, power losses in the bearings and power
losses due to liquid circulation shall be removed by pumped liquid or by supply of external cooling fluid.
c) The magnetic material temperature shall be maintained at or below rated values for the material used.
Magnetic materials should not be subject to irreversible losses.
d) The irreversible magnetic losses at operating temperatures of the magnetic drive shall be considered.
Fluids containing magnetically attracted particles should be avoided unless such particles can be effectively
removed.
Special arrangements may be provided to avoid formation of ice in air gaps when pumping cold liquids.
The magnetic drive shall be designed in such a manner that start-up will not cause the magnet assemblies to
decouple.
4.2.3 Canned motor pumps
Canned motors are generally cooled by circulation of pumped liquid or by the use of coolant liquid to remove
heat generated by the containment liner, eddy current losses, motor electrical losses and mechanical losses.
Stator winding temperatures shall be maintained at or below values established for the grade of insulation used.

ISO/DIS 15783:2025(en)
Figure 3 — Prime mover output, percentage of pump power input at rated conditions
When rating a canned motor, the conditions listed below shall be taken into consideration in addition to
points a) to h) listed under 4.2.1:
— power losses within the canned rotor;
— power losse
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