SIST EN IEC 60076-22-5:2021

Power transformers - Part 22-5: Power transformer and reactor fittings - Electric pumps for transformers

IEC 60076-22-5:2021 covers electric pumps used in the cooling circuits of power transformers and reactors. It applies to electric pumps mounted on liquid immersed power transformers according to IEC 60076-1 and reactors according to IEC 60076-6 with and without conservator for indoor or outdoor installation.
It outlines the operation requirements for the electrical and hydraulic performance, mechanical design, routine testing and type testing. Additionally, performance and dimensions of preferred sizes of pump sets are specified in informative annexes.
The pumps covered in this document are rotodynamic pumps driven by a squirrel cage induction motor that is immersed in the insulating liquid.
Pump sets conforming to this document can be of in-line or end suction design.

Leistungstransformatoren - Teil 22-5: Zubehörteile von Leistungstransformatoren und Drosselspulen - Pumpen

Transformateurs de puissance - Partie 22-5 : Accessoires pour transformateurs de puissance et bobines d’inductance - Electropompes pour transformateurs

L’IEC 60076-22-5:2021 couvre les électropompes utilisées dans les circuits de refroidissement des transformateurs de puissance et des bobines d’inductance. Elle s’applique aux électropompes électriques montées sur des transformateurs de puissance immergés dans un liquide conformes à l'IEC 60076-1 et aux bobines d’inductance conformes à l'IEC 60076-6 avec et sans conservateur pour des installations intérieures ou extérieures.
Elle définit les exigences de fonctionnement pour les performances électriques et hydrauliques, la conception mécanique, les essais individuels de série et les essais de type. De plus, les performances et les dimensions des tailles préférentielles des groupes de pompes sont spécifiées dans les annexes informatives.
Le présent document couvre les pompes rotodynamiques entraînées par un moteur à induction à cage immergé dans le liquide isolant.
Les groupes de pompes conformes au présent document peuvent être des pompes en ligne ou à aspiration axiale.

Močnostni transformatorji - 22-5. del: Oprema močnostnega transformatorja in dušilke - Električne črpalke za transformatorje

General Information

• Status: Published
• Publication Date: 03-May-2021
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: ETR - Power transformers
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Apr-2021
• Due Date: 11-Jun-2021
• Completion Date: 04-May-2021
• Ref Project: EN IEC 60076-22-5:2021 - Power transformers - Part 22-5: Power transformer and reactor fittings - Electric pumps for transformers

Relations

• Replaces: SIST EN 50216-7:2002 - Power transformer and reactor fittings -- Part 7: Electric pumps for transformer oil
• Effective Date: 01-May-2021

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60076-22-5:2021
01-junij-2021
Nadomešča:
SIST EN 50216-7:2002
Močnostni transformatorji - 22-5. del: Oprema močnostnega transformatorja in
dušilke - Električne črpalke za transformatorje
Power transformers - Part 22-5: Power transformer and reactor fittings - Electric pumps
for transformers
Leistungstransformatoren - Teil 22-5: Zubehörteile von Leistungstransformatoren und
Drosselspulen - Pumpen
Transformateurs de puissance - Partie 22-5 : Accessoires pour transformateurs de
puissance et bobines d’inductance - Electropompes pour transformateurs
Ta slovenski standard je istoveten z: EN IEC 60076-22-5:2021
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN IEC 60076-22-5:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60076-22-5:2021

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SIST EN IEC 60076-22-5:2021


EUROPEAN STANDARD EN IEC 60076-22-5

NORME EUROPÉENNE

EUROPÄISCHE NORM
March 2021
ICS 29.180

English Version
Power transformers - Part 22-5: Power transformer and reactor
fittings - Electric pumps for transformers
(IEC 60076-22-5:2021)
Transformateurs de puissance - Partie 22-5 : Accessoires Leistungstransformatoren - Teil 22-5: Zubehörteile von
pour transformateurs de puissance et bobines d'inductance Leistungstransformatoren und Drosselspulen - Pumpen
- Electropompes pour transformateurs (IEC 60076-22-5:2021)
(IEC 60076-22-5:2021)
This European Standard was approved by CENELEC on 2021-02-22. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60076-22-5:2021 E

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SIST EN IEC 60076-22-5:2021
EN IEC 60076-22-5:2021 (E)
European foreword
The text of document 14/1021/CDV, future edition 1 of IEC 60076-22-5, prepared by IEC/TC 14
"Power transformers" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 60076-22-5:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-11-22
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-02-22
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60076-22-5:2021 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60076-6 NOTE Harmonized as EN 60076-6
2

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SIST EN IEC 60076-22-5:2021
EN IEC 60076-22-5:2021 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-1 2017 Rotating electrical machines - Part 1: Rating - -
and performance
IEC 60034-5 - Rotating electrical machines - Part 5: EN IEC 60034-5 -
Degrees of protection provided by the
integral design of rotating electrical
machines (IP code) - Classification
1
IEC 60034-9 - Rotating electrical machines - Part 9: Noise EN IEC 60034-9 -
limits
IEC 60076-1 2011 Power transformers - Part 1: General EN 60076-1 2011
IEC 60076-7 - Power transformers - Part 7: Loading guide - -
for oil-immersed power transformers
IEC 60085 - Electrical insulation - Thermal evaluation and EN 60085 -
designation
IEC 60296 - Fluids for electrotechnical applications - EN IEC 60296 -
Mineral insulating oils for electrical
equipment
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
ISO 179-1 2010 Plastics - Determination of Charpy impact EN ISO 179-1 2010
properties - Part 1: Non-instrumented impact
test
ISO 185 - Grey cast irons - Classification - -

1
To be published. Stage at the time of publication: prEN IEC 60034-9:2021.
3

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SIST EN IEC 60076-22-5:2021
EN IEC 60076-22-5:2021 (E)
Publication Year Title EN/HD Year
ISO 281 - Rolling bearings - Dynamic load ratings and - -
rating life
ISO 3522 - Aluminium and aluminium alloys - Castings - - -
Chemical composition and mechanical
properties
ISO 4406 - Hydraulic fluid power - Fluids - Method for - -
coding the level of contamination by solid
particles
ISO 7005-2 - Metallic flanges; part 2: cast iron flanges - -
ISO 9906 - Rotodynamic pumps - Hydraulic EN ISO 9906 -
performance acceptance tests - Grades 1, 2
and 3
ISO 12944 series Paints and varnishes - Corrosion protection - -
of steel structures by protective paint
systems

4

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SIST EN IEC 60076-22-5:2021



IEC 60076-22-5

®


Edition 1.0 2021-01




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Power transformers –

Part 22-5: Power transformer and reactor fittings – Electric pumps for

transformers



Transformateurs de puissance –

Partie 22-5: Accessoires pour transformateurs de puissance et bobines


d'inductance – Électropompes pour transformateurs













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.180 ISBN 978-2-8322-9249-5




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 60076-22-5:2021
– 2 – IEC 60076-22-5:2021 © IEC 2021
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Service conditions . 7
4.1 General . 7
4.2 Degree of protection of electrical components (IP) . 8
4.3 External corrosion protection . 8
4.4 Internal corrosion protection . 8
4.5 Insulating liquid characteristics . 8
5 General characteristics and requirements . 8
5.1 Rating plate information . 8
5.2 Direction of liquid flow and rotation . 9
5.3 General mechanical requirements . 9
5.4 Casing or enclosure . 9
5.5 Terminal box . 10
5.6 Materials . 10
5.7 Preferred sizes . 10
5.8 Performance requirements . 10
5.8.1 General . 10
5.8.2 Hydraulic performance . 11
5.8.3 Hydraulic interchangeability . 11
5.8.4 Electrical performance . 12
5.8.5 Noise . 13
5.9 Tests . 13
5.9.1 General . 13
5.9.2 List of tests . 13
5.9.3 Routine tests . 13
5.9.4 Type tests . 14
5.9.5 Special tests . 15
(informative) Preferred sizes of end suction pumps . 16
(informative) Preferred sizes of in-line pumps . 18
(informative) Information required with enquiry, proposal and purchase order . 19
(informative) Example of use of hydraulic interchangeability tolerances . 20
Bibliography . 24

Figure 1 – Hydraulic interchangeability across the allowable operating range . 11
Figure 2 – Hydraulic interchangeability across an actual flow range . 12
Figure A.1 – Dimensions of end suction pumps . 16
Figure B.1 – Dimensions of in-line pumps . 18
Figure D.1 – Pressure-flow characteristics . 20
Figure D.2 – Tolerances as given in 5.8.3 applied to pump A . 21
Figure D.3 – Pressure-flow characteristic of pump B superimposed on the
characteristic of pump A . 22

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SIST EN IEC 60076-22-5:2021
IEC 60076-22-5:2021 © IEC 2021 – 3 –
Figure D.4 – Pressure-flow characteristic of pumps C and D superimposed on the
characteristic of pump A . 22
Figure D.5 – Flow ranges . 23

Table A.1 – Dimensions of preferred sizes of end suction pumps (mm) . 17
Table B.1 – Dimensions of preferred sizes of in-line pumps (mm) . 18

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SIST EN IEC 60076-22-5:2021
– 4 – IEC 60076-22-5:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

POWER TRANSFORMERS –

Part 22-5: Power transformer and reactor fittings –
Electric pumps for transformers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60076-22-5 has been prepared by IEC technical committee 14: Power transformers. It is
an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
14/1021/CDV 14/1040A/RVC

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

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SIST EN IEC 60076-22-5:2021
IEC 60076-22-5:2021 © IEC 2021 – 5 –
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC IEC 60076 series, published under the general title Power
transformers, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN IEC 60076-22-5:2021
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POWER TRANSFORMERS –

Part 22-5: Power transformer and reactor fittings –
Electric pumps for transformers



1 Scope
This part of IEC 60076 covers electric pumps used in the cooling circuits of power transformers
and reactors. It applies to electric pumps mounted on liquid immersed power transformers
according to IEC 60076-1 and reactors according to IEC 60076-6 with and without conservator
for indoor or outdoor installation.
It outlines the operation requirements for the electrical and hydraulic performance, mechanical
design, routine testing and type testing. Additionally, performance and dimensions of preferred
sizes of pump sets are specified in informative annexes.
The pumps covered in this document are rotodynamic pumps driven by a squirrel cage induction
motor that is immersed in the insulating liquid.
Pump sets conforming to this document can be of in-line or end suction design.
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.
IEC 60034-1:2017, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-5, Rotating electrical machines – Part 5: Degrees of protection provided by the
integral design of rotating electrical machines (IP code) – Classification
IEC 60034-9, Rotating electrical machines – Part 9: Noise limits
IEC 60076-1:2011, Power transformers – Part 1: General
IEC 60076-7, Power transformers – Part 7: Loading guide for mineral-oil-immersed power
transformers
IEC 60085, Electrical insulation – Thermal evaluation and designation
IEC 60296, Fluids for electrotechnical applications – Mineral insulating oils for electrical
equipment
IEC 60529, Degrees of protection provided by enclosures (IP Code)
ISO 179-1:2010, Plastics – Determination of Charpy impact properties – Part 1: Non-
instrumented impact test
ISO 185, Grey cast irons – Classification

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SIST EN IEC 60076-22-5:2021
IEC 60076-22-5:2021 © IEC 2021 – 7 –
ISO 281, Rolling bearings – Dynamic load ratings and rating life
ISO 3522, Aluminium and aluminium alloys – Castings – Chemical composition and mechanical
properties
ISO 4406, Hydraulic fluid power – Fluids – Method for coding the level of contamination by solid
particles
ISO 7005-2, Metallic flanges – Part 2: Cast iron flanges
ISO 9906, Rotodynamic pumps – Hydraulic performance acceptance tests – Grades 1, 2 and 3
ISO 12944 (all parts), Paints and varnishes – Corrosion protection of steel structures by
protective paint systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
electric pump
component that circulates insulating liquid through the cooling system and
the transformer
Note 1 to entry: Two pump designs are considered: in-line and end suction pumps.
3.2
in-line pump
pump having the suction and delivery flanges on the same axis
Note 1 to entry: They can be of the centrifugal or propeller type; the axis of the flanges generally corresponds to
the axis of rotation of the pump rotor.
3.3
end suction pump
pump having the suction and delivery flanges on perpendicular axes
Note 1 to entry: They can be of the centrifugal type only; the axis of the suction flange corresponds to the axis of
rotation of the pump rotor.
4 Service conditions
4.1 General
The service conditions set out in IEC 60076-1:2011, 4.2 represent the normal scope of
operation of the equipment specified in this document. For any unusual service conditions which
require special consideration in the design of the equipment see IEC 60076-1:2011, 5.5.
Operation under such unusual service conditions shall be subject to agreement between the
purchaser and supplier, as they require special consideration in the design of the equipment.

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4.2 Degree of protection of electrical components (IP)
The degree of protection of the connecting box or terminal box for outdoor installation shall be
at least IP 54 according to IEC 60529, unless otherwise specified by the purchaser.
4.3 External corrosion protection
The materials used for the construction of the equipment or the surface treatment shall be
resistant to the insulating liquid and suitable to withstand the environmental conditions given in
4.1. The corrosion protection shall be agreed between purchaser and manufacturer according
to ISO 12944 (all parts) or other standards as agreed with the purchaser. The responsibility to
specify the correct level of corrosion protection lies with the purchaser and is dependent on the
environment where the transformer will be located and on the durability required. Where no
level of corrosion protection is specified, the minimum shall be C4 medium.
4.4 Internal corrosion protection
It shall be ensured that pumps are clean and free of all foreign matter and contamination.
In consideration of the storage conditions and expected time between shipment and
commissioning, the corrosion protection on the inner side of the pump shall be agreed between
purchaser and manufacturer. If required by the purchaser, internal surfaces of cast iron shall
be finished with an oil resisting protective system.
As a minimum requirement, precautions shall be taken to prevent the ingress of moisture and
the development of internal corrosion by using blanking plates with gaskets.
4.5 Insulating liquid characteristics
If not otherwise specified, the insulating liquid is mineral oil according to IEC 60296 and the
operating temperature shall be in accordance with IEC 60076-7.
When the insulating liquid is not mineral oil then the viscosity variation, the operating
temperature and all the other operating characteristics shall be indicated by the purchaser.
5 General characteristics and requirements
5.1 Rating plate information
The rating plate shall be corrosion resistant and acid proof. It shall be visible when the pump is
assembled to the transformer and carry the following data:
• name or logo of the manufacturer;
• country and manufacturing location;
• number of this document (i.e. IEC 60076-22-5);
• manufacturer’s identification
• manufacturer’s serial number;
• year of manufacturing;
• type of protection by casing (IP code) compliant with IEC 60034-5;
3
• Rated flow [m /h] at 60 °C;
• rated pressure [kPa];
• CE marking or marking in accordance with any other regulation (if applicable);
• thermal class;
• electrical connection (Y / Δ);

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IEC 60076-22-5:2021 © IEC 2021 – 9 –
• rated power or band of rated power;
• rated voltage or band of rated voltage;
• rated frequency;
• rated current or band of rated current;
• rated speed or band of rated speed;
• power factor cos φ;
• weight [kg] if over 30 kg.
The device manufacturer's identification shall allow identification of the device characteristics
from the mounting, operating and maintenance manual supplied by the manufacturer.
5.2 Direction of liquid flow and rotation
The direction of liquid flow and rotational direction shall be indelibly marked on the housing or
be combined with the nameplate.
5.3 General mechanical requirements
Electric pumps for insulating fluid are glandless, rotodynamic pumps driven by a squirrel cage
induction motor. Therefore, motor cooling and bearing lubrication shall be by circulation of the
liquid.
The lifetime of the bearings shall be according to ISO 281 at rated conditions. Where slide
bearings are used, the lifetime shall be at least 200 000 h. Ball bearings shall be of standard
design with a lifetime of at least 50 000 h. The expected lifetime of the pump shall not restrict
the expected lifetime of the transformer under normal service conditions.
At all times, the pumps shall be kept clean and free of contamination and humidity; this is
essential.
Pumps shall be suitable for mounting with the axis of the rotating unit either horizontal or vertical.
If other positions are going to be used, this shall be made known to the manufacturer.
Reverse rotation of the pump shall not cause damage to the pump.
On special request from the purchaser a mechanical or electrical device can be fitted, showing
the pump rotation.
The propeller pumps used to support the liquid flow for radiators' cooling performance (e.g. with
rated pressure of 50 kPa or less), shall have an impeller design which minimizes the restriction
of the liquid flow when the pump is idle.
5.4 Casing or enclosure
Casings or enclosures shall be capable of withstanding a maximum working pressure of
300 kPa under operating conditions without leakage.
Suction and delivery flanges shall conform to PN10 of ISO 7005-2 for end suction pumps and
PN6 or PN10 for in-line pumps. The flanges shall generally be suitable to support the pump in
normal operation. Where the pump design is such that additional supports are required, for

example, for high power end suction pumps, this shall be made known by the manufacturer.
It is the responsibility of the transformer or cooling circuit designer to ensure that the pump is
correctly supported.

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Drain and vent connections shall be provided and be suitable for the installation positions
allowed.
5.5 Terminal box
The manufacturer shall specify the allowed terminal box and cable entry positions, which are
preferably from below.
The connection box shall have at least one cable entry with metric thread.
An earth terminal shall be provided.
2 2
Terminals, including the earthing terminal, shall be suitable to connect 1,5 mm , 2,5 mm ,
2 2
4,0 mm or 6,0 mm cables according to the electric power to be connected. All terminals shall
be easily accessible.
A permanent label shall be provided inside the terminal box cover showing the connections
required for correct rotation of the pump.
5.6 Materials
The pump casing or enclosure shall be manufactured of either cast iron according to ISO 185
grade 200 minimum or aluminium alloy according to ISO 3522 Al-Si. Other suitable materials
agreed between the purchaser and manufacturer may be used.
External fasteners shall be stainless steel.
Rotating un
...