EN ISO 15783:2026

SLOVENSKI STANDARD
01-julij-2026
Centrifugalne črpalke brez tesnila (hermetične črpalke) - Razred II - Specifikacija
(ISO 15783:2026)
Seal-less rotodynamic pumps - Class II - Specification (ISO 15783:2026)
Dichtungslose rotodynamische Pumpen - Klasse II - Spezifikation (ISO 15783:2026)
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre Classe II - Spécifications
(ISO 15783:2026)
Ta slovenski standard je istoveten z: EN ISO 15783:2026
ICS:
23.080 Črpalke Pumps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 15783
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2026
EUROPÄISCHE NORM
ICS 23.080 Supersedes EN ISO 15783:2003, EN ISO
15783:2003/A1:2008
English Version
Seal-less rotodynamic pumps - Class II - Specification (ISO
15783:2026)
Pompes rotodynamiques sans dispositif d'étanchéité Wellendichtungslose Kreiselpumpen - Klasse II -
d'arbre - Classe II - Spécifications (ISO 15783:2026) Technische Anforderungen (ISO 15783:2026)
This European Standard was approved by CEN on 3 May 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15783:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15783:2026) has been prepared by Technical Committee ISO/TC 115 "Pumps"
in collaboration with Technical Committee CEN/TC 197 “Pumps” the secretariat of which is held by
AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2026, and conflicting national standards
shall be withdrawn at the latest by November 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 15783:2003.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 15783:2026 has been approved by CEN as EN ISO 15783:2026 without any modification.

International
Standard
ISO 15783
Second edition
Seal-less rotodynamic pumps —
2026-05
Class II — Specification
Pompes rotodynamiques sans dispositif d'étanchéité d'arbre —
Classe II — Spécifications
Reference number
ISO 15783:2026(en) © ISO 2026
ISO 15783:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 15783:2026(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Design . 4
4.1 General .4
4.1.1 Characteristic curve .4
4.1.2 Net Positive Suction Head (NPSH) .4
4.1.3 Outdoor installation .5
4.2 Prime movers .5
4.2.1 General .5
4.2.2 Magnetic drive pumps .6
4.2.3 Canned motor pumps .7
4.3 Critical speed, balancing and vibrations .8
4.3.1 Critical speed .8
4.3.2 Balancing and vibration .8
4.4 Pressure-containing parts .9
4.4.1 Primary containment .9
4.4.2 Secondary containment .9
4.4.3 Secondary control .10
4.4.4 Pressure-temperature rating . .10
4.4.5 Wall thickness .10
4.4.6 Materials .10
4.4.7 Mechanical features .11
4.5 Branches, nozzles and miscellaneous connections .11
4.5.1 Extent .11
4.5.2 Inlet and outlet branches .11
4.5.3 Venting and draining . 12
4.5.4 Pressure gauge connections . 12
4.5.5 Closures . 12
4.5.6 Auxiliary pipe connections . 12
4.5.7 Connection identification . 12
4.6 External forces and moments on flanges (inlet and outlet) . 12
4.7 Branch (nozzle) flanges. 13
4.8 Impellers . 13
4.8.1 Impeller design . 13
4.8.2 Securing of impellers . 13
4.9 Wear rings or equivalent components . 13
4.10 Running clearance . 13
4.11 Shafts . 13
4.11.1 General . 13
4.11.2 Surface roughness .14
4.12 Bearings .14
4.12.1 General .14
4.12.2 Rolling bearing life .14
4.12.3 Bearing temperature .14
4.12.4 Lubrication .14
4.12.5 Bearing housing design for magnetic drive pumps .14
4.12.6 Sleeve and thrust bearings for the pump shaft .14
4.13 Circulation flow . 15
4.13.1 General . 15
4.13.2 Circulation plans . 15
4.13.3 Magnetic drives . 15

iii
ISO 15783:2026(en)
4.13.4 Canned motor . 15
4.14 Nameplates .16
4.15 Direction of rotation .16
4.16 Couplings for magnetic drive pumps .16
4.17 Baseplate .16
4.17.1 General .16
4.17.2 Non-grouted baseplates .17
4.17.3 Grouted baseplates .17
4.17.4 Assembly of magnetic drive pump and driver on baseplate .17
4.17.5 Tools .17
4.18 Monitoring .17
5 Materials .18
5.1 Selection of materials .18
5.2 Material composition and quality .18
5.3 Repairs .18
6 Testing.18
6.1 General .18
6.2 Material tests .19
6.3 Pump test and inspection .19
6.3.1 Hydrostatic test .19
6.3.2 Hermetic integrity test (optional) .19
6.3.3 Mechanical integrity (optional) . 20
6.3.4 Performance test (optional) .21
6.3.5 Canned motor test .21
6.3.6 Inspection of components .21
6.3.7 Final inspection .21
7 Preparation for dispatch .22
7.1 Surface protection . 22
7.2 Securing of rotating parts for transport . 22
7.3 Openings . 22
7.4 Pipes and auxiliaries . 22
7.5 Identification . 22
8 Information for use .22
Annex A (informative) Data sheet for magnetic drive pumps and canned motor pumps .24
Annex B (informative) External forces and moments on flanges .29
Annex C (informative) Enquiry, proposal and purchase order .30
Annex D (informative) Documentation after purchase order .31
Annex E (informative) Typical circulation piping plans and characteristics for canned motor
pumps and magnetic drive pumps .32
Annex F (informative) Internationally accepted materials for pump parts .38
Annex G (informative) Checklist .46
Bibliography .48

iv
ISO 15783:2026(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 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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 197, Pumps,in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 15783:2002), which has been technically
revised. It also incorporates the Amendment ISO 15783:2002/Amd.1:2008.
The main changes 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.
— Annex F was extensively revised. Hastelloy alloy was also added to Table F.1.
— 4.13.1 and 4.13.3 were added to 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 15783:2026(en)
Introduction
This document 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
International Standard ISO 15783:2026(en)
Seal-less rotodynamic pumps — Class II — Specification
1 Scope
This document 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.
Pumps normally conform to recognized standard specifications (e.g. ISO 5199, explosion protection,
electromagnetic compatibility), except where special requirements are specified herein.
This document 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.
Where conformity to this document has been requested and calls for a specific design feature, alternative
designs can be offered providing that they satisfy the intent of this document and they are described in
detail. Pumps which do not conform with all requirements of this document can also be offered providing
that the deviations are fully identified and described.
Whenever documents include contradictory requirements, they are 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 document;
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
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
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 15783:2026(en)
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
ISO 25178-601, Geometrical product specifications (GPS) — Surface texture: Areal — Part 601: Design and
characteristics of contact (stylus) instruments
IEC 60034 (all parts), Rotating electrical machines
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.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
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
end of the pump which transfers mechanical energy into the liquid being pumped
3.3.2
lubrication
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.
ISO 15783:2026(en)
3.3.3
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
3.3.4
air gap
radial distance between the inner diameter (ID) of the outer magnet assembly and the outer diameter
(OD) of the containment shell
3.4
break-out torque
torque load applied to the drive shaft with the rotor locked at the point at which magnetic decoupling occurs
3.5
magnetic coupling
device which transmits torque through the use of magnet(s) attached to the drive and driven shafts
3.6
inner magnet ring
rows of magnets operating within the containment shell, driven by the outer magnet ring (3.7)
Note 1 to entry: The inner magnet ring is mounted on the same rotating element as the pump impeller.
3.7
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.
3.8
Eddy currents
electrical currents generated in a conductive material when strong magnetic fields are rotated around it
3.8.1
Eddy current loss
power loss resulting from Eddy currents (3.8)
Note 1 to entry: The energy in these Eddy currents is normally dissipated as heat due to the electrical resistance of the
material.
3.8.2
decouple
failure of a synchronous magnetic coupling (3.5) to rotate synchronously, or the stall condition of an eddy
current drive
3.9
Containment
3.9.1
sheath
thin-walled hermetically sealed enclosure fitted to the inner rotor enclosing the inner magnet ring (3.6)
(MDP) or rotor laminations (CMP)
Note 1 to entry: See Figures 1 and 2.

ISO 15783:2026(en)
3.9.2
shell
hermetically sealed enclosure fitted within the total-gap between the inner magnet ring (3.6) and the outer
magnet ring (3.7) of an MDP and which provides for the primary containment of the pumped liquid
Note 1 to entry: See Figure 2.
3.9.3
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.
3.9.4
secondary containment
backup pressure-containing system using static seals only to contain leakage in the event of failure of the
primary containment by shell (3.9.2) or by liner (3.9.3), and including provisions to indicate a failure of the
containment shell or liner
3.9.5
drive shaft
outer shaft of the magnetic drive coupling
3.9.6
secondary control
minimization of release of pumped liquid in the event of failure of the containment shell (3.9.2) or stator liner
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 document 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;

ISO 15783:2026(en)
— 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 should 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).
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 document shall have power output
ratings at least equal to the percentage of rated power input given in Figure 1, 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.

ISO 15783:2026(en)
Key
X pump power input at rated conditions, kW
Y prime mover output, percentage of pump power input at rated conditions, %
Figure 1 — Prime mover output, percentage of pump power input at rated conditions
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/m 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, see Figure 2.
ISO 15783:2026(en)
Key
1 hydraulic end
2 bearing
3 shell
4 bearing housing
5 rolling bearing
6 coupling
7 prime mover
8 baseplate
9 sheath: inner magnet ring
10 outer magnet ring
Figure 2 — Example of a magnetic drive pump (MDP)
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, see Figure 3.
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 losses in the bearings;
— power losses due to liquid circulation;
— explosion protection requirements.
Manufacturers/suppliers shall specify external cooling requirements when required.
Stand-by units may require special arrangements for flushing and/or heating to prevent the settling out of
solids, or the formation of ice, or solidification or too low viscosity of the liquid to be pumped.
•The details of such arrangements should be agreed upon between the purchaser and manufacturer/
supplier.
ISO 15783:2026(en)
Key
1 hydraulic end
2 bearing
3 liner
4 terminal box
5 stator assembly
6 rotor sheath
7 rotor
Figure 3 — Example of a canned motor pump (CMP)
4.3 Critical speed, balancing and vibrations
4.3.1 Critical speed
The critical speed shall be calculated with liquid.
•For some pump types (e.g., vertical line shaft and horizontal multistage), the first critical speed may be
below the operating speed when agreed between the purchaser and manufacturer/supplier.
Particular attention shall be paid to the critical speed when the pump is to be driven at variable speed.
4.3.2 Balancing and vibration
4.3.2.1 General
All major rota
...