IEC 63132-5:2023

Guidance for installation procedures and tolerances of hydroelectric machines - Part 5: Bulb turbines and generators

IEC 63132-5:2023 to establish, in a general way, suitable procedures and tolerances for the installation of hydroelectric turbines and generators. This guide presents a typical assembly. It should be recognized that there are many possible ways to assemble a unit. The size of the machines, design of the machines, layout of the powerhouse and 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.

Lignes directrices des procédures et tolérances d’installation des machines hydroélectriques - Partie 5: Turbines et alternateurs de type bulbe

IEC 63132-5:2023 doit établir, de manière générale, des procédures et des tolérances appropriées pour l’installation de turbines et de générateurs hydroélectriques. Ce guide présente un assemblage typique. Il faut reconnaître qu’il existe de nombreuses façons possibles d’assembler une unité. La taille des machines, la conception des machines, la disposition de la centrale et le calendrier de livraison des composants sont quelques-uns des éléments qui pourraient entraîner des étapes supplémentaires, l’élimination de certaines étapes et / ou des séquences d’assemblage.

General Information

• Status: Published
• Publication Date: 13-Apr-2023
• ICS: 27.140 - Hydraulic energy engineering
• Technical Committee: TC 4 - Hydraulic turbines
• Drafting Committee: WG 30 - TC 4/WG 30
• Current Stage: PPUB - Publication issued
• Start Date: 14-Apr-2023
• Completion Date: 05-May-2023

Standards Content (Sample)

IEC 63132-5 ®
Edition 1.0 2023-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Guidance for installation procedures and tolerances of hydroelectric machines –
Part 5: Bulb turbines and generators

Lignes directrices des procédures et tolérances d’installation des machines
hydroélectriques –
Partie 5: Turbines et alternateurs de type bulbe

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IEC 63132-5 ®
Edition 1.0 2023-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Guidance for installation procedures and tolerances of hydroelectric machines –

Part 5: Bulb turbines and generators

Lignes directrices des procédures et tolérances d’installation des machines

hydroélectriques –
Partie 5: Turbines et alternateurs de type bulbe

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.140 ISBN 978-2-8322-6742-4

– 2 – IEC 63132-5:2023  IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Installation flowchart . 6
4.1 Turbine and generator embedded parts. 6
4.2 Turbine and generator mechanical parts . 7
5 Steps . 9
5.1 Turbine and generator embedded parts. 9
5.1.1 Step 1: Benchmarks set-up . 9
5.1.2 Step 2: Powerhouse primary stage concrete with anchor plates and
embedded pipes . 9
5.1.3 Step 3: Anchor plates, embedded pipes and workspace verification . 9
5.1.4 Step 4: Handing over to installation . 10
5.1.5 Step 5: Draft tube installation. 10
5.1.6 Step 6: Secondary embedded pipes installation around the draft tube . 12
5.1.7 Step 7: Handing over to concreting phase. 12
5.1.8 Step 8: Draft tube embedment . 13
5.1.9 Step 9: Concrete voids testing . 13
5.1.10 Step 10: Draft tube grout injection . 14
5.1.11 Step 11: Handing over to installation . 14
5.1.12 Step 12: Draft tube dimensional inspection after embedment . 14
5.1.13 Step 13: Installation of turbine housing . 15
5.1.14 Step 14: Installation of pier nose liner . 17
5.1.15 Step 15: Installation of generator foundation base . 17
5.1.16 Step 16: Installation of generator hatch cover frame . 18
5.1.17 Step 17: Secondary embedded pipes installation around the turbine
housing. 18
5.1.18 Step 18: Handing over to concreting phase . 18
5.1.19 Step 19: Embedment of turbine housing, pier nose, generator
foundation base plate and hatch cover frame . 18
5.1.20 Step 20: Handing over to installation . 19
5.1.21 Step 21: Corrosion protection for embedded parts . 19
5.1.22 Step 22: Turbine and generator embedded parts complete . 19
5.1.23 Step 23: Turbine and generator mechanical parts installation . 19
5.2 Turbine and generator mechanical parts . 20
5.2.1 Step 1: Turbine and generator embedded parts complete . 20
5.2.2 Step 2: Handing over to installation . 20
5.2.3 Step 3: Dimensional inspection of turbine housing after embedment . 20
5.2.4 Step 4-1: Distributor assembly . 20
5.2.5 Step 4: Distributor installation . 21
5.2.6 Step 5: Lowering and storing of lower half of discharge ring . 21
5.2.7 Step 6-1: Pre-assembly of shaft and bearings . 21
5.2.8 Step 6: Shaft installation . 21
5.2.9 Step 7: Shaft free . 22
5.2.10 Step 8: Combined bearing installation . 23
5.2.11 Step 9: Guide vane servomotor and counterweight installation . 23

5.2.12 Step 10-1: Turbine runner assembly . 24
5.2.13 Step 10: Runner installation . 24
5.2.14 Step 11: Guide vane apparatus final adjustment . 25
5.2.15 Step 12: Lowering and storing of bulb nose . 26
5.2.16 Step 13-1: Rotor assembly . 26
5.2.17 Step 13: Rotor installation . 27
5.2.18 Step 14: Discharge ring installation . 27
5.2.19 Step 15: Shaft alignment . 28
5.2.20 Step 16-1: Stator assembly . 29
5.2.21 Step 16: Stator installation . 29
5.2.22 Step 17: Shaft seal installation . 30
5.2.23 Step 18: Runner blade operating pipes installation . 30
5.2.24 Step 19: Runner oil supply head and extension shaft installation . 30
5.2.25 Step 20: Runner cone installation . 31
5.2.26 Step 21: Bulb nose installation . 31
5.2.27 Step 22: Generator supports installation . 31
5.2.28 Step 23: Access shaft installation and hatch cover closing . 31
5.2.29 Step 24: Remaining turbine parts installation completion . 32
5.2.30 Step 25: Final installation and cabling generator . 32
5.2.31 Step 26: Generator auxiliary systems installation . 32
5.2.32 Step 27: Turbine auxiliary systems installation . 33
5.2.33 Step 28: Cleaning, painting and inspection before initial tests . 33
5.2.34 Step 29: Turbine and generator mechanical parts complete . 33
5.2.35 Step 30: Commissioning . 33
Bibliography . 34

Figure 1 – Generic installation flowchart – Bulb turbine and generator embedded parts . 7
Figure 2 – Generic installation flowchart – Bulb turbine and generator mechanical parts . 8
Figure 3 – Draft tube liner installation . 12
Figure 4 – Draft tube liner embedment plan . 13
Figure 5 – Radial tilting of turbine housing flange. 16
Figure 6 – Turbine housing installation . 17
Figure 7 – Shaft free . 23
Figure 8 – Guide vane apparatus final adjustment . 26
Figure 9 – Discharge ring installation . 28

Table 1 – Draft tube installation tolerances . 11
Table 2 – Turbine housing installation tolerances . 15
Table 3 – Shaft free verifications. 22
Table 4 – Guide vane apparatus adjustment tolerances . 25
Table 5 – Discharge ring measurement . 28
Table 6 – Stator installation measurement . 29

– 4 – IEC 63132-5:2023  IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GUIDANCE FOR INSTALLATION PROCEDURES AND
TOLERANCES OF HYDROELECTRIC MACHINES –

Part 5: Bulb turbines and generators

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 63132-5 has been prepared by IEC technical committee 4: Hydraulic turbines. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
4/456/FDIS 4/462/RVD
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.

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/publications.
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.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under 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 document 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.

– 6 – IEC 63132-5:2023  IEC 2023
GUIDANCE FOR INSTALLATION PROCEDURES AND
TOLERANCES OF HYDROELECTRIC MACHINES –

Part 5: Bulb turbines and generators

1 Scope
The purpose of this document is to establish, in a general way, suitable procedures and
tolerances for the installation of bulb turbine and generator. This document presents a typical
assembly and whenever the words “turbine” and “generator” are used in this part, it refers to
bulb turbine and generator. There are many possible ways to assemble a unit. The size of the
machine, the design of the machine, the layout of the powerhouse, the sequence of concreting
or the delivery schedule of the components are some of the elements that could result in
additional steps, or 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.
The document excludes matters of purely commercial interest, except those inextricably bound
up with the conduct of installation. It also excludes specifications of the civil works but this
aspect of the work should be taken into consideration during the assembly of the units.
Wherever the document specifies that documents, drawings or information are supplied by a
manufacturer (or by manufacturers), each individual manufacturer will furnish the appropriate
information for their own supply only.
2 Normative references
There are no normative references in this document.
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:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Installation flowchart
4.1 Turbine and generator embedded parts
Figure 1 shows a generic installation flowchart for bulb turbine and generator embedded parts.

Figure 1 – Generic installation flowchart –
Bulb turbine and generator embedded parts
4.2 Turbine and generator mechanical parts
Figure 2 shows generic installation flowchart for bulb turbine and generator mechanical parts.

– 8 – IEC 63132-5:2023  IEC 2023

Figure 2 – Generic installation flowchart – Bulb turbine and generator mechanical parts

5 Steps
5.1 Turbine and generator embedded parts
5.1.1 Step 1: Benchmarks set-up
a) Objective of work in the step
– Set-up benchmarks to be used for starting proper installation of the turbine and
generator.
b) Explanation of work
– Sufficient benchmarks should be provided to establish the unit centreline, axis and
elevation.
c) Recommendations
N/A
d) Additional information
Depending on the project delivery system (EPC, design build, etc.), the benchmarks or their
reference points could be provided by the owner, civil contractor, etc. Whoever provides the
benchmarks or reference points is responsible to make sure they are correct.
The benchmark type (x, y, z coordinates, definition of the axis and elevations, etc.) should be
agreed to before the beginning of the work.
The turbine supplier should take care to transfer the necessary benchmarks throughout the
erection and/or concreting processes so that the benchmarks remain accessible as the unit is
assembled.
5.1.2 Step 2: Powerhouse primary stage concrete with anchor plates and embedded
pipes
a) Objective of work in the step
– Install primary embedded pipes, anchor plates and steel foundations in the correct
locations.
b) Explanation of work
– Install the primary embedded pipes and supporting systems.
– Install the foundation components of the draft tube liner, servomotor, stay columns and
pier nose.
c) Recommendations
Different designs require different tolerances; therefore, it is recommended that the turbine
supplier should provide the tolerances. It is considered as a best practice to perform:
– Non-destructive tests as applicable (i.e. visual inspections, pressure tests of the piping,
test of welding seams).
– Measures to prevent the concrete from entering the pipes or contaminating the machined
surfaces of foundations during concreting.
d) Additional information
The contract should define which party is responsible to install the primary embedded pipes
and/or the foundation components of draft tube liner, servomotor, stay columns and pier nose.
5.1.3 Step 3: Anchor plates, embedded pipes and workspace verification
a) Objective of work in the step
– Confirm that the foundation components of draft tube liner, servomotor, stay columns
and pier nose have been installed in the correct place. Verify that the shape of concreted
area is per the design and there is sufficient access to the workplace.

– 10 – IEC 63132-5:2023  IEC 2023
b) Explanation of work
– Ensure that the dimensions of the shape of concreted area match the design.
– Ensure that there will be no interference between the concrete structures, the reinforcing
steels, the scaffolding, etc. and the foundation components of draft tube liner,
servomotor, stay columns and pier nose.
– Once the workplace is acceptable, the turbine and generator installation work can start.
c) Recommendations
It is recommended to check that the foundation components of the draft tube liner,
servomotor, stay columns and pier nose and the primary embedded pipes were installed
within the tolerances provided by the turbine and generator supplier.
d) Additional information
N/A
5.1.4 Step 4: Handing over to installation
a) Objective of work in the step
– The work space is transferred to the turbine and generator supplier.
b) Explanation of work
– There is normally an official transfer of the working area from the civil contractor to the
turbine and generator supplier. The transfer is typically documented with some type of
signed form.
c) Recommendations
N/A
d) Additional information
N/A
5.1.5 Step 5: Draft tube installation
a) Objective of work in the step
– Install the draft tube (see Figure 3).
b) Explanation of work
– Transportation of the draft tube flange and the draft tube liner segments to the foundation
and placing them on the foundation plates.
– Tack-welding of the draft tube flange and the draft tube liner segments.
– Inspection of the alignment and principal dimensions of the draft tube flange and the
draft tube liner before welding.
– Welding of the draft tube flange and the draft tube liner.
– Inspection of alignment and measurement of principal dimensions of the draft tube flange
and the draft tube liner after welding.
c) Recommendations
The items showed in Table 1 should be checked.

Table 1 – Draft tube installation tolerances
Item Tolerance Minimum number of Measurement location
measurements
Difference between the
outlet end of the draft
To be determined by
Junction tube liner and the inlet of
turbine supplier
the concrete portion of
the draft tube.
2 for each side
To be determined by Elevation of inlet and
Elevation
turbine supplier outlet
(Left and right)
8 when RD < 4m
To be determined by
Flatness Flatness of inlet flange
turbine supplier
16 when RD ≥ 4m
To be determined by Vertical inclination of inlet
Vertical Inclination
turbine supplier flange
(Top and bottom)
To be determined by Horizontal inclination of
Horizontal Inclination
turbine supplier inlet flange
(Left and right)
To be determined by
Orientation 1 Orientation of inlet flange
turbine supplier
Concentricity of both inlet
To be determined by 4 at both inlet flange and
Concentricity flange and outlet end to
turbine supplier outlet end
centre line
To be determined by 8 at both inlet flange and Circularity of both inlet
Circularity
turbine supplier outlet end flange and outlet end
Axial position of inlet
To be determined by
Axial position 1 flange to turbine centre
turbine supplier
line
– Non-destructive tests of the welding seams.
– Proper fixation of the draft tube.
d) Additional information
The sequence for the installation of the draft tube flange and the draft tube liner should be
provided by the turbine supplier.
If the downstream concrete portion of the draft tube cannot be completed prior to the
installation of the draft tube liner, the outlet position of the draft tube liner cannot be
determined by the junction method. Therefore, another method will be required to position
the outlet of the draft tube liner. The downstream concrete portion would then be adapted
to the draft tube liner outlet.
Adequate supports or bracing are required to prevent the draft tube flange and the draft
tube liner from moving or changing shape during placing of the secondary concrete.
The draft tube flange and segments should be checked for any erosion or deformation to be
fixed prior to welding/assembly tasks.

– 12 – IEC 63132-5:2023  IEC 2023

Figure 3 – Draft tube liner installation
5.1.6 Step 6: Secondary embedded pipes installation around the draft tube
a) Objective of work in the step
– Install the secondary embedded pipes.
b) Explanation of work
– Install the embedded pipes in the draft tube pit prior to concreting.
c) Recommendations
The following items should be checked:
– Non-destructive tests performed according to inspection and test plans.
– Dimensional checks of the locations of the pipes.
The following preventive measures should be considered:
– Support the pipes so they cannot move or be damaged during concreting
– Cover/block the pipe openings to prevent concrete from entering the pipes during
concreting.
d) Additional information
Secondary embedded pipes should include draft tube dewatering piping, pressure tapping
connections for testing or monitoring purposes, etc.
The condition of the piping, especially the small sizes, should be inspected for any
deterioration.
5.1.7 Step 7: Handing over to concreting phase
a) Objective of work in the step
– The work space is transferred to the civil contractor.
b) Explanation of work
– The turbine supplier should confirm that the draft tube liner has been installed and
aligned properly and is ready for concreting.
– There is normally an official transfer of the working area of the draft tube from the turbine
supplier to the civil contractor. The transfer typically is documented with some types of
signed form.
c) Recommendations
Refer to Table 1 at step 5 of turbine and generator embedded parts.
d) Additional information
– N/A
5.1.8 Step 8: Draft tube embedment
a) Objective of work in the step
– Embed the draft tube (see Figure 4).
b) Explanation of work
– Install the reinforcements.
– Position of the formwork.
– Pour concrete.
c) Recommendations
The concrete pour rate, pour/step heights and allowable differential levels should be agreed
among the concerned parties during the early stages of project development, due to the
critical impacts to deformation and misalignment.
d) Additional information
Care should be taken when placing concrete not to damage any of the embedded
components or piping.
Figure 4 shows an example of a concreting plan.

Figure 4 – Draft tube liner embedment plan
5.1.9 Step 9: Concrete voids testing
a) Objective of work in the step
– Determine if there are voids (hollow spaces) between the draft tube liner and the
concrete.
b) Explanation of work
– A common method to detect voids is by tapping the inside surface of the draft tube liner
with a hammer.
– 14 – IEC 63132-5:2023  IEC 2023
c) Recommendations
While there is no established standard for determining the amount of voids that require
2 2
grouting, it is recommended that a single area greater than 0,1 m to 0,2 m , depending on
unit size should to be grouted. Additionally, a minimum of 80 % of the liner should be firmly
in contact with the concrete.
d) Additional information
Areas where there is no contact between the draft tube liner and the concrete will sound in
a different tone (resonance) when hit with a hammer.
5.1.10 Step 10: Draft tube grout injection
a) Objective of work in the step
– Fill the voids between the draft tube liner and the concrete with grout.
b) Explanation of work
– Drill holes and fix connections for injecting grouting material.
– Drill air vents.
– Fill voids with grouting material.
– Plug the injection and vent holes when completed.
c) Recommendations
Void detection should be repeated after grout filling to ensure that no wide voids are left.
d) Additional information
The grouting pressure should be determined during the early stages of a project
development due to the impacts (on schedule and costs) of the design of the draft tube.
Some owners will specify the grouting pressure.
Typical hydrostatic pressure for grouting is 50 kPa.
5.1.11 Step 11: Handing over to installation
a) Objective of work in the step
– The work space is transferred to the turbine supplier.
b) Explanation of work
– There is normally an official transfer of the working area from the civil contractor to the
turbine supplier. The transfer is typically documented with some type of signed form.
c) Recommendations
N/A
d) Additional information
N/A
5.1.12 Step 12: Draft tube dimensional inspection after embedment
a) Objective of work in the step
– Determine if the dimensions and positions of the draft tube have changed during
concreting.
b) Explanation of work
– Measurements are taken to confirm that the draft tube did not distort or move during
placement of the concrete.
c) Recommendations
Refer to Table 1 at step 5 of turbine and generator embedded parts.
d) Additional information
The centre of the draft tube inlet flange will become the reference centre for installing the
turbine housing.
The as-set elevation and position of the draft tube might influence the installation of the
remainder of the turbine and generator.
5.1.13 Step 13: Installation of turbine housing
a) Objective of work in the step
– Install the turbine housing (see Figure 5 and Figure 6).
b) Explanation of work
– Pre-assembly of the turbine housing components.
– Install, align (centre, inclination, elevation, etc.) and fix the turbine housing and stay
columns on the embedded foundation plates.
c) Recommendations
The items showed in Table 2 should be checked.
Table 2 – Turbine housing installation tolerances
Minimum number of
Item Tolerance Measurement location
measurements
Concentricity of To be determined by Seating faces of inner
distributor seating faces turbine supplier ring and outer ring
Parallelism of distributor To be determined by Seating faces of inner
seating faces turbine supplier ring and outer ring
8 when D < 4 m
Flatness of distributor To be determined by Seating faces of inner
seating faces turbine supplier ring and outer ring
16 when D ≥ 4 m
Concentricity with draft To be determined by Seating faces of inner
tube turbine supplier ring and draft tube
To be determined by Outlet side for distributor
Orientation 1
turbine supplier seating face
Turbine housing at stator
2 for each
Vertical inclination of To be determined by
flange and seating face of
turbine housing turbine supplier
(top and bottom)
inner ring
Turbine housing at stator
2 for each
Horizontal inclination of To be determined by
flange and seating face of
turbine housing turbine supplier
(left and right)
inner ring
Flatness of stator frame To be determined by
16 Stator frame seating face
seating face generator supplier
Radial tilting of stator To be determined by Outside and inside
16 for each diameter
frame seating face generator supplier diameter of stator flange
Flatness of bearing To be determined by
Bearing support shield
support shield seating combined bearing 8
seating face
face supplier
Radial tilting of bearing To be determined by
Bearing support shield
support shield seating combined bearing 8 for each diameter
seating face
face supplier
To be determined by Distance between turbine
Distance 4
turbine supplier housing to draft tube

– Non-destructive tests of the welding seams.
– Proper fixation of the turbine housing.

– 16 – IEC 63132-5:2023  IEC 2023
d) Additional information
Figure 5 – Radial tilting of turbine housing flange

Figure 6 – Turbine housing installation
5.1.14 Step 14: Installation of pier nose liner
a) Objective of work in the step
– Install the pier nose liner.
b) Explanation of work
– Installation and alignment of the pier nose liner.
c) Recommendations
N/A
d) Additional information
N/A
5.1.15 Step 15: Installation of generator foundation base
a) Objective of work in the step
– Install the generator foundation base.
b) Explanation of work
– Installation of the generator foundation base.
c) Recommendations
N/A
d) Additional information
N/A
– 18 – IEC 63132-5:2023  IEC 2023
5.1.16 Step 16: Installation of generator hatch cover frame
a) Objective of work in the step
– Install the generator hatch cover frame.
b) Explanation of work
– Installation of the generator hatch cover frame.
c) Recommendations
N/A
d) Additional information
The generator hatch cover frame should be supported by a temporary structure (formwork
for ceiling construction) provided by the civil contractor.
If available, the hatch cover itself can be used for supporting the hatch cover frame during
embedment.
5.1.17 Step 17: Secondary embedded pipes installation around the turbine housing
a) Objective of work in the step
– Install the embedded pipes.
b) Explanation of work
– Installation of the pipes around the turbine housing and generator hatch cover before
final concreting.
c) Recommendations
The following items should be checked:
Non-destructive tests and pressure tests of the pipes and dimensional checks of their
locations should be performed according to design requirements.
The following preventive measures should be considered:
– Support the pipes so they cannot move or be damaged during concreting.
– Cover/block pipe openings to prevent concrete from entering the pipes during
concreting.
d) Additional information
N/A
5.1.18 Step 18: Handing over to concreting phase
a) Objective of work in the step
– The work space is transferred to the civil contractor.
b) Explanation of work
– There is normally an official transfer of the working area from the turbine supplier to the
civil contractor or owner. The transfer is typically documented with some type of signed
form.
c) Recommendations
N/A
d) Additional comments
N/A
5.1.19 Step 19: Embedment of turbine housing, pier nose, generator foundation base
plate and hatch cover frame
a) Objective of work in the step
– Finalize the concrete structure around the turbine/generator.

b) Explanation of work
– Finalization of the concrete structure around the turbine/generator and embedding
turbine housing, pier nose, generator foundation base plate and hatch cover frame.
c) Recommendations
The principal dimensions and surface finish of the concreted water passage should be
inspected according to the turbine supplier drawings.
The concrete pour rate, pour/step heights and allowable differential levels should be agreed
by the concerned parties during the early stages of project development due to the critical
impacts to deformation and misalignment.
After installation of reinforcements for concreting, alignments of each component should be
rechecked before pouring concrete.
Special care should be taken to avoid interference between the embedded parts and the
concrete reinforcement bars.
d) Additional information
The formwork for the ceiling construction shall not be supported by any turbine component
to avoid deformations and misalignments. Care should be taken when placing concrete not
to damage any of the embedded components or piping.
5.1.20 Step 20: Handing over to installation
a) Objective of work in the step
– The work space is transferred to the turbine supplier/installer.
b) Explanation of work
– There is normally an official transfer of the working area from the civil contractor to the
turbine supplier/installer. The transfer is typically documented with some type of signed
form.
c) Recommendations
N/A
d) Additional information
N/A
5.1.21 Step 21: Corrosion protection for embedded parts
a) Objective of work in the step
– Protect the water passage side of the embedded parts against corrosion.
b) Explanation of work
– Remove all internal reinforcements
– Prepare the components for corrosion protection.
– Apply the corrosion protection.
c) Recommendations
The corrosion protection specification should be provided by the turbine supplier.
d) Additional information
N/A
5.1.22 Step 22: Turbine and generator embedded parts complete
This step defines the end of the process.
5.1.23 Step 23: Turbine and generator mechanical parts installation
This step identifies the beginning of the next group of activities.

– 20 – IEC 63132-5:2023  IEC 2023
5.2 Turbine and generator mechanical parts
5.2.1 Step 1: Turbine and generator embedded parts complete
This step identifies the end of the previous group of activities.
5.2.2 Step 2: Handing over to installation
a) Objective of work in the step
– The work space is transferred to the turbine supplier.
b) Explanation of work
– There is normally an official transfer of the working area from the civil contractor to the
turbine supplier. The transfer is typically documented with some type of signed form.
c) Recommendations
N/A
d) Additional information
N/A
5.2.3 Step 3: Dimensional inspection of turbine housing after embedment
a) Objective of work in the step
– Determine the shape and location of the turbine housing after embedment.
b) Explanation of work
– Measure and confirm the position and alignment of the turbine housing after embedment.
c) Recommendations
The turbine housing dimension should be checked to see if the readings, taken according
to Table 2 at step 13 of the embedded parts section, have changed after concreting.
d) Additional information
In case unacceptable deformations are detected, site grinding, machining of flanges or other
correction work could be used.
5.2.4 Step 4-1: Distributor assembly
a) Objective of work in the step
– Assembly of distributor segments.
b) Explanation of work
– Assembly of distributor segments at an area outside of the turbine pit.
– Assembly of outer ring with bearing bushings, guide vanes, levers.
– Assembly of operating ring and links on outer ring.
– Assembly of inner ring with bearing bushings, guide vane shaft.
– Assembly of lifting device to fix relative position o
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