IEC TR 61948-1:2016

SLOVENSKI STANDARD
01-april-1999
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Hydraulic turbines, storage pumps and pump-turbines - Tendering Documents - Part 1:
General and annexes
Ta slovenski standard je istoveten z: IEC/TR 61366-1
ICS:
27.140 Vodna energija Hydraulic energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL
IEC
REPORT – TYPE 3
61366-1
First edition
1998-03
Hydraulic turbines, storage pumps
and pump-turbines –
Tendering Documents –
Part 1:
General and annexes
Turbines hydrauliques, pompes d'accumulation
et pompes-turbines –
Documents d'appel d'offres –
Partie 1:
Généralités et annexes
 IEC 1998  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
Commission Electrotechnique Internationale
CODE PRIX
XA
International Electrotechnical Commission
For price, see current catalogue

– 2 – 61366-1  IEC:1998(E)
CONTENTS
Page
FOREWORD . 4
Clause
0 Introduction. 7
1 Scope and object . 8
2 Reference documents and definitions . 8
2.1 Reference documents . 8
2.1.1 Application of reference documents . 8
2.1.2 IEC publications . 8
2.1.3 ISO standards . 9
2.1.4 National standards . 9
2.2 Definitions. 9
2.3 Schematic representation of a hydraulic machine . 11
2.4 Use of SI units . 11
2.5 Specific hydraulic energy. 12
2.6 Specified conditions . 13
3 Arrangement of Tendering Documents (TD). 14
3.1 General. 14
3.2 Table of contents . 14
3.3 Main sections of the Tendering Documents . 15
3.3.1 Tendering requirements (see clause 4). 15
3.3.2 Project information (see clause 5) . 16
3.3.3 General conditions, special conditions, and general requirements
(see clause 6) . 16
3.3.4 Technical specifications . 16
4 Guidelines for tendering requirements . 17
4.1 Instructions to Tenderers (ITT) . 17
4.1.1 Object of tender . 17
4.1.2 Submission and opening of tenders . 17
4.1.3 Tendering Documents . 17
4.1.4 Order of precedence for Tendering Documents. 17
4.1.5 Validity of tender . 18
4.1.6 Clarifications and addenda . 18
4.1.7 Modification to or withdrawal of tender. 18
4.1.8 Acceptance and rejection of tenders . 18
4.1.9 Preparation of tender. 19
4.1.10 Signature of Tenderer . 19
4.1.11 Tender prices . 19
4.1.12 Tender bond. 19
4.1.13 Design and performance . 19
4.1.14 Alternative tenders and deviations from Tendering Documents . 20
4.1.15 Evaluation of tenders. 20
4.1.16 Letter of acceptance. 20

61366-1  IEC:1998(E) – 3 –
Clause Page
4.1.17 Formal contract . 21
4.1.18 Performance bond. 21
4.1.19 Premium and liquidated damages . 21
4.2 Tender form . 21
4.2.1 General. 21
4.2.2 Documents constituting the tender. 21
4.2.3 Deviations from Tendering Documents . 21
4.2.4 Tender prices . 22
4.3 Technical data sheets . 22
4.4 Tenderer's drawings. 22
4.5 Other contract forms . 22
4.6 Tenderer's reference list . 22
5 Guidelines for project information . 22
5.1 Scope of work . 22
5.2 Project description . 23
5.3 Project and contract schedules. 23
5.4 Delivery point . 23
5.5 Operation and maintenance. 23
5.6 Project facilities and information. 24
5.7 Project organization . 24
6 Guidelines for general conditions, special conditions and general requirements . 25
6.1 Guidelines for general conditions. 25
6.2 Guidelines for special conditions . 25
6.3 Guidelines for general requirements . 25
6.3.1 General items. 25
6.3.2 Technical documents. 26
6.3.3 Project administration. 26
6.3.4 Materials and workmanship . 26
6.3.5 Quality assurance (QA) and quality control (QC) programmes. 27
6.3.6 Shop assembly and tests. 27
6.3.7 Surface preparation and protective coatings . 27
6.3.8 Packaging and transportation . 27
6.3.9 Model acceptance tests . 27
6.3.10 Site installation requirements. 27
6.3.11 Field acceptance tests. 27
Annexes
A Sample table of contents of Tendering Documents for Francis turbines. 28
B Comments on factors for evaluation of tenders . 32
C Checklist for tender form . 38
D Example for technical data sheets . 39
E Technical performance guarantees. 49
F Example of cavitation pitting guarantee . 52
G Checklist for model test specifications . 54
H Sand erosion considerations. 56

– 4 – 61366-1  IEC:1998(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP TURBINES –
TENDERING DOCUMENTS –
Part 1: General and annexes
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
report of one of the following types:
• type 1, when the required support cannot be obtained for the publication of an International
Standard, despite repeated efforts;
• type 2, when the subject is still under technical development or where for any other reason
there is the future but no immediate possibility of an agreement on an International
Standard;
• type 3, when a technical committee has collected data of a different kind from that which is
normally published as an International Standard, for example "state of the art".
Technical reports of types 1 and 2 are subject to review within three years of publication to
decide whether they can be transformed into International Standards. Technical reports of
type 3 do not necessarily have to be reviewed until the data they provide are considered to be
no longer valid or useful.
61366-1  IEC:1998(E) – 5 –
IEC 61366-1, which is a technical report of type 3, has been prepared by IEC technical
committee 4: Hydraulic turbines.
The text of this technical report is based on the following documents:
Committee draft Report on voting
4/110/CDV 4/122/RVC
Full information on the voting for the approval of this technical report can be found in the report
on voting indicated in the above table.
Technical Report IEC 61366-1 is one of a series which deals with Tendering Documents for
hydraulic turbines, storage pumps and pump-turbines. The series consists of seven parts:
Part 1: General and annexes (IEC 61366-1)
Part 2: Guidelines for technical specifications for Francis turbines (IEC 61366-2)
Part 3: Guidelines for technical specifications for Pelton turbines (IEC 61366-3)
Part 4: Guidelines for technical specifications for Kaplan and propeller turbines (IEC 61366-4)
Part 5: Guidelines for technical specifications for tubular turbines (IEC 61366-5)
Part 6: Guidelines for technical specifications for pump-turbines (IEC 61366-6)
Part 7: Guidelines for technical specifications for storage pumps (IEC 61366-7)
Parts 2 to 7 are "stand-alone" publications which when used with Part 1 contain guidelines for a
specific machine type (i.e. Parts 1 and 4 represent the combined guide for Kaplan and
propeller turbines). A summary of the proposed contents for a typical set of Tendering
Documents is given in the following table 1 and annex A. Table 1 summarizes the arrangement
of each part of this guide and serves as a reference for the various chapters and sections of
the Tendering Documents (see 3.2 of this part.)
A bilingual edition of this technical report may be issued at a later date.

Table 1 – Summary of guide for the preparation of Tendering Documents for hydraulic turbines, storage pumps and pump-turbines
CONTENTS OF GUIDE IEC 61366-1 TO IEC 61366-7 SAMPLE TABLE OF CONTENTS OF TENDERING DOCUMENTS (TD)
(Example for the Francis turbines; see 61366-1, annex A)
Part Clause Title Chapter Title
1 General and annexes 1 Tendering requirements
1– 2 Project information
1 1 Object and scope of this guide 3 General conditions
1 2 Reference documents and definitions 4 Special conditions
1 3 Arrangement of Tendering Documents 5 General requirements
1 4 Guidelines for tendering requirements 6 Technical specifications
1 5 Guidelines for project information 6.1 Technical requirements
1 6 Guidelines for general conditions, special conditions and general 6.1.1 Scope of work
requirements 6.1.2 Limits of the contract
6.1.3 Supply by Employer
1 Annexes 6.1.4 Design conditions
6.1.5 Performance and other guarantees
A Sample table of contents of Tendering Documents for Francis turbines 6.1.6 Mechanical design criteria
B Comments on factors for evaluation of tenders 6.1.7 Design documentation
C Check list for tender form 6.1.8 Materials and construction
D Examples of technical data sheets 6.1.9 Shop inspection and testing
E Technical performance guarantees 6.2 Technical specifications for fixed/embedded components
F Example of cavitation pitting guarantees 6.3 Technical specifications for stationary/removable components
G Check list for model test specifications 6.4 Technical specifications for guide vane regulating apparatus
H Sand erosion considerations 6.5 Technical specifications for rotating parts, bearings and seals
6.6 Technical specifications for thrust bearings
2 to 7 Technical specifications 6.7 Technical specifications for miscellaneous components
6.8 Technical specifications for auxiliary systems
2 Francis turbines 6.9 Technical specifications for instrumentation
3 Pelton turbines 6.10 Spare parts
4 Kaplan and propeller turbines 6.11 Model tests
5 Tubular turbines 6.12 Installation and commissioning
6 Pump-turbines 6.13 Field acceptance tests
7 Storage pumps
61366-1  IEC:1998(E) – 7 –
HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP TURBINES –
TENDERING DOCUMENTS –
Part 1: General and annexes
0 Introduction
The application of hydraulic machines to a specific project is made from design criteria
uniquely adapted to that particular site. Accordingly, the possibility of using identical machines
from one site to another is usually remote because of many variations in basic design and
operating conditions. For this reason, it is not feasible in a single publication of this type to
develop standard documents which cover a wide range of site specific applications or to
specify in detail the various machine types. However, the technical report will assist in
preparation of Tendering Documents (TD) through the use of a common layout which takes
advantage of uniformity and the time-saving features of word processing software. A uniform
approach of the type proposed will make it easier for the Employer to prepare the Tendering
Documents and for the Tenderer to prepare its proposal.
The report outlines the various chapters needed for a complete set of Tendering Documents,
together with comments on the purpose of each and discussions as necessary. The guide is
intended to assist in making certain that information is placed in the appropriate section;
thereby avoiding possible conflict or duplication. This results in a greater degree of
completeness in the documents and adds to their adaptability and ease of updating while
minimizing misinterpretations.
The main objective for inviting competitive tenders for hydraulic machines is to purchase the
most economical equipment which will meet the performance requirements of the specific site.
The capital investment in machinery is a significant one; it can range from 20 % to 50 % of
project costs. The value of machine performance becomes an important item of concern in the
purchasing process. This guide contains some information on methods of evaluation and
means of establishing performance criteria to assist in achieving optimum equipment selection.
In preparing Tendering Documents, cognisance should be taken of problems which may be
encountered by unnecessarily restrictive specifications, particularly when applied to machines
of small to moderate sizes within the range covered by the guide. Restrictive requirements may
add significantly to the cost of the equipment without a proportional gain in its reliability or
performance. It is important therefore that Tendering Documents properly define and describe,
in an effective manner, the specific conditions of operation, size, number of units to be
installed, and special features required, if any.
Tendering Documents which require an inordinate amount of information from Tenderers can
also unnecessarily increase the costs for preparing and evaluating tenders. This may also
unnecessarily restrict the successful Contractor's freedom to apply an optimal design and may
deter the Tenderer from tendering at all. Information requested in the technical data sheets,
therefore, should be limited to that which is really essential for evaluation and comparison of
tenders by the Employer and engineer.
In conclusion, this guide should not be used to replace the engineering effort needed in the
selection, design, manufacturing, installation, and testing of the machines and associated
systems; nor does it contain complete detailed specifications and descriptions of conditions or
components. It is assumed that qualified engineering personnel will be engaged on the project
to undertake the necessary evaluation of site conditions and selection of equipment which will
meet the performance, operation, reliability, and maintainability criteria established for the
project.
– 8 – 61366-1 © IEC:1998(E)
1 Scope and object
This technical report, referred to herein as the "Guide", is intended to assist in the preparation
of Tendering Documents and tendering proposals and in the evaluation of tenders for hydraulic
machines.
The object of this technical report is to provide a general guide for preparation of Tendering
Documents (TD) for the supply, installation and testing of hydraulic turbines, storage pumps,
and pump-turbines herein referred to as hydraulic machines as defined in 2.2 of this
publication. This technical report considers the case where both equipment supply and site
installation are carried out by the same Contractor. In those cases where site installation is not
included in the scope of work, the Tendering Documents should include supplementary
provisions for site supervisory services to be provided by the equipment supply Contractor and
for day-to-day interface with the site installation Contractor.
Hydraulic machines for small units with power less than 5 MW and with runner/impeller
diameters less than 3 m are covered in IEC 61116. These limitations are not intended to be
absolute and will depend on the type of machine and on other project characteristics.
2 Reference documents and definitions
2.1 Reference documents
2.1.1 Application of reference documents
The adoption of reference documents can greatly assist users of this guide by avoiding
unnecessary duplication of standards and codes which have gained industry acceptance. There
are a number of sources for reference documents such as IEC, ISO, regional or national
standards, and other recognized standards. It is strongly recommended that users take
advantage of such standard documents in preference to developing new versions for similar
requirements. The Employer should be prepared to provide copies of non-international
standards to the Tenderers and/or the Contractors upon request.
2.1.2 IEC publications
IEC publications (in their latest revision), as they apply, should be used and referenced in the
preparation of Tendering Documents and the related technical specifications. The list of
IEC publications relating to hydraulic machinery is as follows:
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60041:1992, Field acceptance tests to determine the hydraulic performance of hydraulic
turbines, storage pumps and pump-turbines
IEC 60617 (all parts), Graphical symbols for diagrams
IEC 60193,— Model acceptance tests to determine the hydraulic performance of hydraulic
turbines, storage pumps and pump-turbines (to be published)
IEC 60308:1970, International code for testing of speed governing systems for hydraulic
turbines
IEC 60545:1976, Guide for commissioning, operation and maintenance of hydraulic turbines
IEC 60609:1978, Cavitation pitting evaluation in hydraulic turbines, storage pumps, and pump-
turbines
IEC 60609-2:1997, Cavitation pitting evaluation in hydraulic turbines, storage pumps and
pump-turbines – Part 2: Evaluation in Pelton turbines

61366-1  IEC:1998(E) – 9 –
IEC 60805:1985, Guide for commissioning, operation and maintenance of storage pumps and
of pump-turbines operating as pumps
IEC 60994:1991, Guide for field measurement of vibrations and pulsations in hydraulic
machines (turbines, storage pumps and pump-turbines)
1)
IEC 61362,— Guide to specification of hydroturbine control systems
IEC 61116:1992, Electromechanical equipment guide for small hydroelectric installations
IEC 61364:1998, Nomenclature of hydraulic machinery
IEC 60034 (all parts), Rotating electrical machines
2.1.3 ISO standards
In addition to IEC publications, numerous internationally accepted recommendations have been
prepared by ISO, some of which may apply to specific items. If a contradiction is found
between IEC standards and ISO standards, the IEC standards shall govern.
2.1.4 National standards
Where no applicable international standards exist, regional and/or national standards should be
used in preference to developing unique requirements. In this connection, where equivalence
of national standards has been previously established by the Employer, this equivalence should
be accepted for subsequent projects.
Where national standards are mandatory by law, such requirements shall be specified in the
documents. The Employer should provide copies of mandatory standards to Tenderers and/or
Contractors upon request or specify where such standards may be obtained.
2.2 Definitions
The following definitions apply to this guide:
Words for which definitions are given in IEC publications shall be used only with the meanings
defined by IEC. No other definitions shall be used for such words.
2.2.1
Employer
party named in the Tendering Documents which will employ the Contractor and the legal
successors in title to the Employer but not, except with the consent of the Contractor, any
assignee of the Employer. Employer shall also mean purchaser and owner.
2.2.2
Contractor
party whose tender has been accepted by the Employer and includes the Contractor's personal
representatives, successors, and permitted assignees. The Contractor shall also mean
supplier.
NOTE – The terms Employer and Contractor are in agreement with relative use in FIDIC documents, see 6.1.
2.2.3
guide
this technical report for the preparation of Tendering Documents for hydraulic turbines, storage
pumps and pump-turbines
2.2.4
hydraulic machinery
hydraulic impulse or reaction turbines, storage pumps, or pump-turbines

– 10 – 61366-1 © IEC:1998(E)
2.2.5
turbine
hydraulic turbine. Its meaning shall also include a pump-turbine operating as a turbine.
2.2.6
pump
pump and it shall also include a pump-turbine operating as a pump
2.2.7
Tendering Documents
complete documents including the tendering requirements, project information, general
conditions, special conditions, general requirements, technical specifications and drawings
prepared for the purpose of soliciting tenders for hydraulic machines
2.2.8
tendering requirements
instructions to Tenderers, tender proposal form, technical data sheets, and other contractual forms
2.2.9
Tenderer
as the context requires, any party or parties tendering on the various classes of work and
services covered by the Tendering Documents
2.2.10
tender
proposal prepared by Tenderer and submitted to the Employer in response to Tendering Documents
2.2.11
contract documents
includes the Employer-Contractor agreement, the Tendering Documents, all addenda issued
prior to execution of contract, and all modifications thereto, and any other items specifically
stipulated as being included in the contract documents
2.2.12
contract
agreement entered into between the Employer and the Contractor for work to be done and/or
material and equipment to be furnished in accordance with the Tendering Documents and the
Contractor's tender proposal which will be either referred to in or attached to and form part of
said agreement. Contract shall also mean all written information, specifications, and drawings
which further detail, explain or modify by mutual agreement the work even though such written
information, specifications, and Contractor's and Employer's drawings are issued after
execution of said agreement.
61366-1  IEC:1998(E) – 11 –
2.2.13
work
material, labour, equipment, services, and all the various classes of work to be executed,
whether temporary or permanent, under the contract. It also means the place of working where
the context so indicates
2.2.14
licensor
owner of intellectual property such as patents, proprietary information, know-how who
authorises another party, the licensee, to use said intellectual property
2.2.15
engineer
person, firm, or company appointed and designated by the Employer to act as the engineer for
the purposes of the contract
2.2.16
engineer's representative
any engineer or assistant of the engineer appointed from time to time by the Employer or the
engineer to perform the duties set forth in the Tendering Documents whose authority shall be
notified in writing to the Contractor by the engineer
Terminology for different machine components shall be as defined in the IEC 61364.
2.3 Schematic representation of a hydraulic machine
The limits of a hydraulic machine are represented in figures 1 and 2 in which the terms "high-
pressure reference section" and "low-pressure reference section", as well as "high-pressure
side" and "low-pressure side" are identified.
The terms "high-pressure reference section" and "low-pressure reference section" define the
high-pressure and low-pressure sides of the hydraulic machine irrespective of the flow
direction. Therefore, the terms are independent of the mode (turbine or pump) of operation of
the machine. The "high-pressure reference section" and "low-pressure reference section" of
the machine are those to which hydraulic performance guarantees apply.
Refer to IEC 60041 for other technical terms, definitions, symbols and units.
2.4 Use of SI units
The International system of units (SI) applies to this guide. All terms used in the Tendering
Documents should be given in SI units in order to comply with the IEC publications which relate
to performance tests of hydraulic machines (either model or prototype).
In the SI system, mass (kg) is one of the base units. The energy per unit mass, known as
"specific hydraulic energy", is used in this guide as a primary term instead of energy per local
unit weight, known as "head".
The term "head" has the disadvantage that weight depends on acceleration due to gravity (g)
which changes with both latitude and altitude. These changes can influence the absolute
measurements of hydraulic performance of a machine and could lead to unnecessary
confusion in the interpretation of the final test results. The term "head" differs from the term
"specific hydraulic energy" only by the factor "g" which is the local value of acceleration due to
gravity. Accordingly, the term "specific hydraulic energy" should be used when specifying
performance guarantees and related requirements in the Tendering Documents. The term
"head" may remain for some time because it has been in use for many decades. In this guide,
the term "specific hydraulic energy" will be followed by the term "head" in parenthesis.

– 12 – 61366-1 © IEC:1998(E)
2.5 Specific hydraulic energy
The "specific hydraulic energy of the machine", with the symbol E, is the specific energy of
water (J/kg) available between the high and low-pressure reference sections of the machine
taking into account the influence of compressibility. For a more definitive definition for practical
application, refer to 2.3.6 of IEC 60041.
2 2
v − v
()1 2
()ρρ−
abs abs2
E = + +(zz−×) g
ρ 2
where
p is the absolute pressure (Pa)
abs
ρ is the density (kg/m )
v is the velocity (m/s)
z
is the elevation of point in the system above reference datum (usually mean sea level)
g is the acceleration due to gravity (m/s )
ρ 0,5 × (ρ + ρ )
1 2
g 0,5 × (g + g )
1 2
The application of "specific hydraulic energy" to a particular project requires care in identifying
losses:
E is the specific hydraulic energy of the plant which is defined as the specific hydraulic
g
energy of water (J/kg) available between headwater level and tailwater level;
E are the specific hydraulic energy losses between any two sections (J/kg);
L
E is the specific hydraulic energy of the machine (J/kg).
Assume E = E + E (refer to figure 1)
L L3-1 L2-4
where
E is the specific hydraulic energy loss between headwater level (3) and high-pressure
L3-1
reference section (1);
E is the specific hydraulic energy loss between the low-pressure reference section (2) and
L2-4
tailwater level (4).
For a turbine: E = E – E (J/kg)
g L
For a pump: E = E + E (J/kg)
g L
Derived quantities (also used in previous IEC publications):
1)
H (turbine head) = E/ g (m)
1)
H (plant head) = E / g (m)
g g
1)
H (head losses) = E / g (m)
L L
___________
1)
Use of these terms in Tendering Documents should be avoided.

61366-1  IEC:1998(E) – 13 –
2.6 Specified conditions
This guide uses the term "specified" to describe or denote values of quantities such as power,
specific hydraulic energy (head), speed, discharge, etc. which dictate the design conditions for
the hydraulic machine. Terms starting with the prefix "rated" (such as rated power, rated
specific hydraulic energy, and rated discharge) should no longer be used.
IEC  471/98
For symbols of this figure, refer to figure 6 of IEC 60041.
Figure 1 – Schematic representation of a hydroelectric plant
IEC  472/98
Figure 2 – Schematic representation of a hydraulic machine

– 14 – 61366-1 © IEC:1998(E)
3 Arrangement of Tendering Documents (TD)
3.1 General
It is recommended that the Tendering Documents (TD) used for procurement of hydraulic
machinery be prepared in a standard layout. This should reduce the time taken to prepare the
documents, ensure that they are presented in an orderly and thorough manner, and avoid
confusion in their subsequent interpretation.
3.2 Table of contents
The sample table of contents for Tendering Documents for Francis turbines (annex A) is based
on the following arrangement of main chapters:
Chapter Title
1 Tendering requirements (see clause 4)
2 Project information (see clause 5)
3 General conditions (see clause 6)
4 Special conditions (see clause 6)
5 General requirements (see clause 6)
6 Technical specifications for hydraulic machines (see Parts 2-7)
1)
7 Technical specifications for hydro-turbine control systems
1)
8 Technical specifications for oil pressure systems
1)
9 Technical specifications for high-pressure side [shut-off] valves or gates
1)
10 Technical specifications for relief valves
1)
11 Technical specifications for low-pressure side valves or gates
1)
12 Technical specifications for thrust bearings (when not part of hydraulic machine
supply)
Tendering Documents (TD) for hydroelectric power equipment procurement, may at the option
of the Employer, include related equipment other than hydraulic machinery such as generators
or motors; motor-generators; excitation and/or starting systems; control, metering and relaying
panels; bus duct equipment; switchgear; power transformers; etc.
The Tendering Documents (TD) should be arranged in chapters, sections, and subsections as
follows:
1 Chapter
1.1 Section
1.1.1 Subsection
1.1.1.1 Use only as required
Chapters 2 (Project information), 3 (General conditions), and 5 (General requirements), may be
common to all Tendering Documents for machine procurement on a given project. These
chapters contain much information which applies specifically to the project, therefore they need
to be carefully co-ordinated between the Employer and the engineer.

61366-1  IEC:1998(E) – 15 –
Chapter 6 will vary according to the type of hydraulic machine for which the Tendering
Documents are being prepared. Guidelines for the preparation of technical specifications for
various types of hydraulic machines are provided in (parts 2 to 7 of this guide). There may be
occasions, however, when it may be necessary because of the characteristics of the site to
have the choice between two different types of machines remain open to Tenderers. This will
permit Tenderers to prepare their tenders on the basis of their equipment designs which may
offer performance and/or cost advantages for the particular site. In this event, chapter 6 (main
tender) and chapter 6-1 (alternative) should be used for the main or alternate machine types,
respectively, in which the contents and numbering systems would be similar for uniformity.
When the decision is made to include the full range of equipment and systems for a single unit
or units in a combined set of Tendering Documents, additional chapters may be added to the
technical specifications as illustrated above (i.e. chapters 7 to 12, inclusive). Guidelines for
preparation of technical specifications for equipment and systems other than for hydraulic
machines, however, are not given in this guide.
Technical specifications for machines and systems other than hydraulic machines should be
prepared using the same or similar headings and numbering systems illustrated for TD
chapter 6 in parts 2 to 7 for the various machine types. This will retain continuity throughout the
Tendering Documents. In parts 2 to 7 of this technical report, subclause numbering corres-
ponds to subsection numbering of chapters in the Tendering Documents (see annex A).
A detailed sample table of contents for the Tendering Documents prepared in this case for
Francis turbines is provided in annex A. This guide follows the sequence of the various
chapters and sections in annex A in accordance with the general scheme explained above. The
table of contents may have to be modified to accommodate other types of hydraulic machines.
3.3 Main sections of the Tendering Documents
The chapters of the Tendering Documents are briefly described in this clause. Reference is
made to other clauses in the guide where more information is given for the main chapters.
3.3.1 Tendering requirements (see clause 4)
3.3.1.1 Instructions to Tenderers (herein referred to as ITT)
The main purpose of the ITT is to list, explain, and bring to the attention of the Tenderers,
those items which specifically apply to the preparation of tenders. The ITT should contain
instructions to the Tenderers clarifying the Employer's request for tenders, closing date,
submittal of information, options to be considered, and data concerning evaluation of tenders.
The Employer should make certain that matters of importance for the administrative validity of
the tender are listed in the ITT only and not in the technical specifications.
To avoid confusion, all requirements for preparation of the tenders should be stated only in the
ITT and should not be hidden in other chapters of the Tendering Documents.
3.3.1.2 Tender forms
Tender forms are formal documents which are to be completed by the Tenderer. The tender
forms include pricing information, formal signatures of the Tenderer, tendering bond (if used),
and other related information such as license agreements. See annex C for check list of tender
forms.
3.3.1.3 Technical data sheets
Blank data sheets should be prepared by the Employer to show technical information required
from each Tenderer. This will ensure that technical and project related information describing
the product proposed by Tenderer is in a common tabular format for convenient evaluation of
the tenders. An example of technical data sheets is given in annex D.

– 16 – 61366-1 © IEC:1998(E)
3.3.1.4 Tenderer's drawings
Drawings referred to in this section are those which are to be prepared by the Tenderer to
illustrate details of the equipment and systems to assist in the Employer's evaluation of the
tenders.
3.3.1.5 Other contract forms
These forms, to be completed by the successful Tenderer, include performance bond, form of
Agreement, and other forms specified by the Employer.
3.3.2 Project information (see clause 5)
This section provides a description of the scope of work, project conditions, scheduling
requirements, operating conditions, project drawings, and other project-related information.
The location of this section near the beginning of the Tendering Documents serves as an
important reference summary of the work.
3.3.3 General conditions, special conditions, and general requirements (see clause 6)
3.3.3.1 General conditions
The general conditions are contractual requirements normally established by the Employer to
meet corporate or business needs.
3.3.3.2 Special conditions
Special conditions are used to amplify, qualify, or alter the general conditions for the specific
Tendering Documents.
3.3.3.3 General requirements
The purpose of general requirements is to consolidate those requirements which are of a
general technical nature. Adaptation of these requirements should be possible from one
contract to another within the project.
3.3.4 Technical specifications
Technical specifications contain engineering and technical details from which the Tenderers
will prepare their tender, and from which the Contractor will design, manufacture, install, and
test the machine. The technical specifications, as proposed in this guide, will make it possible
to have the Tendering Documents in a convenient form for the purchase of a complete
generating/pumping unit or units. Technical specifications for specific machine types are
contained in the following parts of the guide:
– Guidelines for technical specifications for Francis turbines (Part 2)
– Guidelines for technical specifications for Pelton turbines (Part 3)
– Guidelines for technical specifications for Kaplan and propeller turbines (Part 4)
– Guidelines for technical specifications for tubular turbines (Part 5)
– Guidelines for technical specifications for pump-turbines (Part 6)
– Guidelines for technical specifications for storage pumps (Part 7)

61366-1  IEC:1998(E) – 17 –
4 Guidelines for tendering requirements (TD Chapter 1)
4.1 Instructions to Tenderers (ITT)
4.1.1 Object of tender (1.1.1 of annex A)
The object of tender should contain the following information:
– name of project;
– a one paragraph summary covering scope of work and key contract dates;
– name, address, telephone, telex and FAX numbers of the Employer's representative to be
contacted by Tenderers during the tendering period; and
– process (and cost, if any) by which Tenderers may obtain additional copies of the
Tendering Documents.
4.1.2 Submission and opening of tenders (1.1.2 of annex A)
This Subsection should include:
– time, date, and location (when, where, and how) tenders shall be submitted. If a “public
opening of tender” is planned by the Employer, the time, date and nature of such opening
should be defined together with the extent and details of tender information received from
Tenderers which will be made available by the Employer to all Tenderers. It is
recommended that a minimum tendering period of 12 weeks be provided fo
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