SIST EN IEC 63132-2:2020
(Main)Guide for installation procedures and tolerances of hydroelectric machines - Part 2: Vertical generator (IEC 63132-2:2020)
Guide for installation procedures and tolerances of hydroelectric machines - Part 2: Vertical generator (IEC 63132-2:2020)
The purpose of this part of IEC 63132 is to establish, in a general way, suitable procedures and
tolerances for installation of generator. This document presents a typical assembly. There are
many possible ways to assemble a unit. The size of the machines, design of the machines,
layout of the powerhouse or delivery schedule of the components are some of the elements that
could result in additional steps, the elimination of some steps and/or assembly sequences.
It is understood that a publication of this type will be binding only if, and to the extent that, both
contracting parties have agreed upon it.
This document excludes matters of purely commercial interest, except those inextricably bound
up with the conduct of installation.
This document applies to vertical generators according to IEC 60034-7 1.
The tolerances in this document have been established upon best practices and experience,
although it is recognized that other standards specify different tolerances.
Brushless excitation system is not included in this document.
Wherever this document specifies that documents, drawings or information is supplied by a
manufacturer (or by manufacturers), each individual manufacturer will furnish the appropriate
information for their own supply only.
Leitfaden für Installations-Prozeduren und -Toleranzen von hydroelektrischen Maschinen – Teil 2: Vertikale Generatoren (IEC 63132-2:2020)
Guide des procédures et tolérances d'installation des machines hydroélectriques - Partie 2: Alternateur vertical (IEC 63132-2:2020)
IEC 63132-2:2020 L’objectif de la présente partie de l'IEC 63132 est d’établir, d’une façon générale, des procédures et des tolérances adéquates pour l’installation des turbines et alternateurs hydroélectriques. Ce document présente un assemblage typique. Il y a plusieurs façons possibles pour assembler un groupe. Les dimensions des machines, la conception des machines, le plan de la centrale et l’échéancier des livraisons des différentes composantes sont quelques éléments qui peuvent résulter en l’ajout d’étapes, l’élimination de certaines étapes et/ou des séquences d’assemblages.
Il est entendu que ce type de document sera contraignant seulement si, et dans la mesure où, les deux parties contractuelles l’ont convenu.
Ce document exclut les questions d’intérêt purement commercial, sauf celles inextricablement liées au déroulement de l’installation.
Les tolérances mentionnées dans ce document ont été déterminées selon les meilleures pratiques et l’expérience, bien qu’il soit reconnu que d’autres normes spécifient des tolérances différentes.
Ce guide s’applique aux alternateurs verticaux selon l'IEC 60034-7.
Partout où ce document précise que des documents, des dessins ou des renseignements sont fournis par un fabricant (ou par des fabricants), chaque fabricant fournira les informations appropriées pour leur propre approvisionnement seulement.
Navodila za postopke vgradnje in tolerance hidroelektričnih strojev - 2. del: Vertikalni generator (IEC 63132-2:2020)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 63132-2:2020
01-september-2020
Navodila za postopke vgradnje in tolerance hidroelektričnih strojev - 2. del:
Vertikalni generator (IEC 63132-2:2020)
Guide for installation procedures and tolerances of hydroelectric machines - Part 2:
Vertical generator (IEC 63132-2:2020)
Leitfaden für Installations-Prozeduren und -Toleranzen von hydroelektrischen Maschinen
– Teil 2: Vertikale Generatoren (IEC 63132-2:2020)
Guide des procédures et tolérances d'installation des machines hydroélectriques - Partie
2: Alternateur vertical (IEC 63132-2:2020)
Ta slovenski standard je istoveten z: EN IEC 63132-2:2020
ICS:
27.140 Vodna energija Hydraulic energy engineering
SIST EN IEC 63132-2:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 63132-2:2020
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SIST EN IEC 63132-2:2020
EUROPEAN STANDARD EN IEC 63132-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2020
ICS 27.140
English Version
Guidance for installation procedures and tolerances of
hydroelectric machines - Part 2: Vertical generators
(IEC 63132-2:2020)
Lignes directrices des procédures et tolérances Leitfaden für Installations-Prozeduren und -Toleranzen von
d'installation des machines hydroélectriques - Partie 2: hydroelektrischen Maschinen - Teil 2: Vertikale
Alternateurs verticaux Generatoren
(IEC 63132-2:2020) (IEC 63132-2:2020)
This European Standard was approved by CENELEC on 2020-05-25. 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63132-2:2020 E
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SIST EN IEC 63132-2:2020
EN IEC 63132-2:2020 (E)
European foreword
The text of document 4/381/FDIS, future edition 1 of IEC 63132-2, prepared by IEC/TC 4 "Hydraulic
turbines" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 63132-2:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-02-25
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-05-25
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 63132-2:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 63132-1 NOTE Harmonized as EN IEC 63132-1
IEC 63132-3 NOTE Harmonized as EN IEC 63132-3
IEC 63132-4 NOTE Harmonized as EN IEC 63132-4
2
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SIST EN IEC 63132-2:2020
EN IEC 63132-2:2020 (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
1
IEC 60034-7 - Rotating electrical machines - Part 7: Classification - -
of types of construction, mounting arrangements
and terminal box position (IM Code)
1
Third edition under preparation. Stage at the time of publication: IEC/ACDV 60034-7:2019.
3
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SIST EN IEC 63132-2:2020
IEC 63132-2
®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Guidance for installation procedures and tolerances of hydroelectric machines –
Part 2: Vertical generators
Lignes directrices des procédures et tolérances d’installation des machines
hydroélectriques –
Partie 2: Alternateurs verticaux
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.140 ISBN 978-2-8322-8102-4
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 63132-2:2020
– 2 – IEC 63132-2:2020 IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Preparation . 6
5 Installation flowchart . 6
6 Steps . 8
6.1 Step 1: Turbine shaft free . 8
6.2 Step 2: Generator foundation check . 8
6.3 Step 3-1: Lower bracket assembly . 8
6.4 Step 3: Lower bracket installation . 9
6.5 Step 4: Lower bracket bases embedment . 9
6.6 Step 5-1: Stator assembly . 9
6.7 Step 5: Stator installation . 10
6.8 Step 6: Thrust and guide bearing assembly . 10
6.9 Step 7: Brakes and jacks installation . 11
6.10 Step 8: Lower generator shaft installation . 11
6.11 Step 9: Thrust block installation . 11
6.12 Step 10-1: Rotor assembly . 11
6.13 Step 10: Rotor installation . 12
6.14 Step 11: Upper shaft installation . 13
6.15 Step 12-1: Upper bracket assembly . 13
6.16 Step 12: Upper bracket installation . 13
6.17 Step 13: Uncoupled generator shafts runout check . 14
6.18 Step 14: Turbine and generator shafts coupling . 14
6.19 Step 15: Unit alignment . 15
6.20 Step 16: Upper bracket and/or stator bases embedment . 18
6.21 Step 17: Generator guide bearings assembly and adjustment . 19
6.22 Step 18: Slip (collector) rings installation and runout checks . 19
6.23 Step 19: Brush holder supporting structure and brushes installation . 19
6.24 Step 20: Remaining generator parts installation completion . 19
6.25 Step 21: Cleaning, painting and inspection before initial tests . 20
6.26 Step 22: Generator complete . 20
6.27 Step 23: Commissioning . 20
Bibliography . 21
Figure 1 – Generic installation flowchart – Generator . 7
Figure 2 – Stator and rotor magnetic centre . 17
Figure 3 – Unit alignment (thrust bearing below the rotor) . 18
Table 1 – Runout and shaft verticality . 15
Table 2 – Circularity, concentricity and verticality . 16
Table 3 – Air gap . 16
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SIST EN IEC 63132-2:2020
IEC 63132-2:2020 IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDANCE FOR INSTALLATION PROCEDURES
AND TOLERANCES OF HYDROELECTRIC MACHINES –
Part 2: Vertical generators
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.
International Standard IEC 63132-2 has been prepared by IEC technical committee 4: Hydraulic
turbines.
The text of this International Standard is based on the following documents:
FDIS Report on voting
4/381/FDIS 4/391/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 63132 series, published under the general title Guidance for
installation procedures and tolerances of hydroelectric machines, can be found on the IEC
website
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– 4 – IEC 63132-2:2020 IEC 2020
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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
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SIST EN IEC 63132-2:2020
IEC 63132-2:2020 IEC 2020 – 5 –
GUIDANCE FOR INSTALLATION PROCEDURES
AND TOLERANCES OF HYDROELECTRIC MACHINES –
Part 2: Vertical generators
1 Scope
The purpose of this part of IEC 63132 is to establish, in a general way, suitable procedures and
tolerances for installation of generator. This document presents a typical assembly. There are
many possible ways to assemble a unit. The size of the machines, design of the machines,
layout of the powerhouse or delivery schedule of the components are some of the elements that
could result in additional steps, the elimination of some steps and/or assembly sequences.
It is understood that a publication of this type will be binding only if, and to the extent that, both
contracting parties have agreed upon it.
This document excludes matters of purely commercial interest, except those inextricably bound
up with the conduct of installation.
1
This document applies to vertical generators according to IEC 60034-7 .
The tolerances in this document have been established upon best practices and experience,
although it is recognized that other standards specify different tolerances.
Brushless excitation system is not included in this document.
Wherever this document specifies that documents, drawings or information is supplied by a
manufacturer (or by manufacturers), each individual manufacturer will furnish the appropriate
information for their own supply only.
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 60034-7:-, Rotating electrical machines - Part 7: Classification of types of constructions,
2
mounting arrangements and terminal box position (IM Code)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
____________
1
Third edition under preparation. Stage at the time of publication: IEC/ACDV 60034-7:2019.
2
Third edition under preparation. Stage at the time of publication: IEC/ACDV 60034-7:2019.
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– 6 – IEC 63132-2:2020 IEC 2020
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Preparation
Embedded parts such as piping and foundation plates are covered in the turbine embedded
parts.
5 Installation flowchart
The installation flowchart of this document showed in Figure 1 is mainly based on a vertical
generator having its thrust bearing under the rotor. If the generator has the thrust bearing above
the rotor or supported by the head cover, some corrections to the flowchart will be necessary.
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SIST EN IEC 63132-2:2020
IEC 63132-2:2020 IEC 2020 – 7 –
NOTE 1 This flowchart represents a generator with thrust bearing below the rotor. For generators with thrust bearing
above the rotors, the steps with an asterisk would be totally or partially done between steps 11 and 12 in the flowchart.
NOTE 2 The generator installation is linked to the turbine installation.
Figure 1 – Generic installation flowchart – Generator
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– 8 – IEC 63132-2:2020 IEC 2020
6 Steps
6.1 Step 1: Turbine shaft free
See the relevant turbine part of this document.
6.2 Step 2: Generator foundation check
a) Objective of work in the step
– Check the foundations for the upper and/or lower brackets (if applicable) and the stator.
– Check the openings for cables/bars for phase terminals and neutral point.
– Check the embedded water and oil piping.
b) Explanation of work
– Check the foundations for the lower bracket, upper bracket and the stator.
– Check the dimension of the openings.
– Check the position of piping (if secondary stage concreting is used, also check).
– Install the foundation bolts.
– Install the sole plates.
c) Recommendations
The tolerances should be provided by the generator supplier.
– If a one-stage concreting method is used
The location in plan, elevation and/or locations of the foundation plates should be
checked.
– If a two-stage concreting method is used
The location in plan, elevation and/or locations of the foundation bolts, embedded parts
and block-outs should be checked.
d) Additional information
There are two different methods for embedding the sole plates; one-stage concreting or two-
stage concreting method.
Care shall be taken when placing concrete to avoid moving the generator foundations.
If the two-stage concreting method is used, the entire surface of the block-out for the lower
bracket and stator bases should be prepared to ensure proper bonding between secondary
and primary concrete.
There are many different generator configurations. See IEC 60034-7 for a description of the
possibilities. The various configurations may or may not have a lower or an upper bracket.
6.3 Step 3-1: Lower bracket assembly
a) Objective of work in the step
– Assemble the lower bracket.
b) Explanation of work
– Attach the arms to the hub, as per the design (i.e. welding, bolting).
– This task is generally carried out outside of the pit.
c) Recommendations
The tolerances should be provided by the generator supplier, if required.
If the lower bracket is assembled by welding, non-destructive tests (NDT) according to the
inspection and test plan (ITP) may be required.
d) Additional information
The generator supplier should take precautions to limit the distortion by welding in order to
be able to connect to the embedded parts.
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SIST EN IEC 63132-2:2020
IEC 63132-2:2020 IEC 2020 – 9 –
The lower bracket, upper bracket, rotor and stator assemblies are typically the largest
components in a unit and take considerable time (days to months) to assemble. Their
assembly works are often carried out in parallel and can greatly affect the assembly space
requirements and availability. This step is presented to ensure the reader is aware that there
are often challenges to find space and have all parties work effectively together on this issue.
6.4 Step 3: Lower bracket installation
a) Objective of work in the step
– Install the lower bracket in the correct position.
b) Explanation of work
– Place the lower bracket on the sole plates.
– Control the concentricity, elevation and level of the lower bracket.
c) Recommendations
Concentricity, elevation and level should be checked. The tolerances should be provided by
the generator supplier. When determining the correct elevation, the lower bracket deflection
due to the total weight of the rotating parts and the hydraulic thrust acting on the runner
when the unit is at the desired operating condition should be considered.
d) Additional information
Different designs require different tolerances; therefore, it is recommended that the
generator supplier provides the tolerances.
The lower bracket is aligned to the centre of bottom ring. The turbine shaft is typically to be
a relative reference. Other methods that employ benchmarks could also be used to align the
lower bracket.
In some cases, the brakes and jacks are installed in this step instead of Step 7: Brakes and
jacks installation.
6.5 Step 4: Lower bracket bases embedment
a) Objective of work in the step
– Embed the lower bracket bases.
b) Explanation of work
– Grout the through-bolts or the foundation bolts and sole plates.
c) Recommendations
Before embedment, check that any reinforcement will not interfere with the sole plates and
foundation bolts.
d) Additional information
Ensure that the air can escape upwards during grouting. Some designs do not require
second stage concrete.
Depending on the design, it may be possible to embed the lower bracket foundation plates
before installation of the lower bracket.
Care shall be taken when placing concrete to avoid moving the lower bracket bases.
6.6 Step 5-1: Stator assembly
a) Objective of work in the step
– Assemble the stator.
b) Explanation of work
– Assemble the stator frame by bolting or welding.
– Stack the core.
– Install the winding.
– Execute the electrical tests and mechanical measurements.
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c) Recommendations
Please see Step 15: Unit alignment. The tolerances depend on the design.
d) Additional information
The stator can be assembled in the shop, in the pit or beside the pit. The stator can be
assembled from a number of pre-assembled blocks comprising cores, windings and frame,
or the frame is assembled first at the site and then the core is stacked in one complete ring.
Protect all winding parts especially during drilling and welding work occurring nearby.
See the additional information in Step 3-1: Lower bracket assembly.
6.7 Step 5: Stator installation
a) Objective of work in the step
– Install the stator in the pit.
b) Explanation of work
– Install the stator at the proper level, elevation and position.
c) Recommendations
Please see Step 15: Unit alignment. The tolerances depend on the design.
The stator magnetic centre elevation and stator core verticality should be checked. The
tolerances should be provided by the generator supplier.
d) Additional information
The stator is aligned to the centre of the bottom ring using a relative reference. The turbine
shaft flange is typically the relative reference. Other methods that employ benchmarks could
also be used to align the stator.
The alignment of the stator will be checked during the unit alignment (see Step 15: Unit
alignment). In some cases, the stator position may require adjustment.
6.8 Step 6: Thrust and guide bearing assembly
a) Objective of work in the step
– Assemble the combined thrust and guide bearing.
b) Explanation of work
– The thrust and guide bearing components and accessories are installed in the oil
reservoir located on the thrust bearing bracket.
– Check and eliminate any oil leakage from the oil reservoir.
c) Recommendations
The thrust bearing and bracket assembly is located concentric, at the proper elevation and
level. The tolerances should be provided by the generator supplier.
d) Additional information
The thrust bearing is aligned to the centre of the thrust bearing bracket. This may be
required for the bearing to function properly.
The alignment of the thrust bearing, the thrust bearing bracket and the rotating components
will be checked in Step 15: Unit alignment. In some cases, the position of these components
may require adjustment.
In order to install the rotor, a minimum of four guide bearing segments, spaced 90° apart,
shall be installed.
In some designs, the thrust bearing may be supported on the top of the head cover. In this
case, the thrust bearing housing is aligned to the centre of the head cover. The thrust
bearing is aligned to the centre of the thrust bearing housing.
In some designs, the generator guide bearing(s) may not be combined with the thrust
bearing. Other designs may also have a smaller diameter on the generator guide bearing
preventing the installation of the thrust block.
The electrical insulation of the bearing system should be checked.
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IEC 63132-2:2020 IEC 2020 – 11 –
NOTE The term "thrust bearing bracket" means either the lower or the upper bracket on which the thrust bearing is
located. In the case of a thrust bearing located below the rotor, the thrust bearing bracket is the lower bracket.
6.9 Step 7: Brakes and jacks installation
a) Objective of work in the step
– Install the brakes and lifting jacks.
b) Explanation of work
– Assemble the jacks, as per the design (i.e. on the lower bracket arms or on support
pedestals on the concrete).
– Assemble the pipes.
– Install the accessories (compressor, control panel, air tank, oil reservoir, etc.).
c) Recommendations
The level and height tolerances for the brake shoes should be provided by the generator
supplier.
d) Additional information
N/A
6.10 Step 8: Lower generator shaft installation
a) Objective of work in the step
– Install the lower generator shaft (if applicable) for coupling with the turbine shaft.
b) Explanation of work
– Install the lower shaft in the pit.
c) Recommendations
The level, elevation, concentricity and inclination should be checked. The tolerances should
be provided by the generator supplier.
d) Additional Information
N/A
6.11 Step 9: Thrust block installation
a) Objective of work in the step
– Place the thrust block on the thrust bearing and assemble to the shaft.
b) Explanation of work
– Connect the thrust runner to the thrust block.
– Connect the thrust block to the lower shaft (when the thrust bearing is below the rotor).
– Connect the thrust block to the upper shaft (when the thrust bearing is above the
...
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