Hydraulic turbines, storage pumps and pump-turbines - Tendering Documents - Part 2: Guidelines for technical specifications for Francis turbines

Vodne turbine, akumulacijske črpalke in črpalne turbine – Razpisna dokumentacija – 2. del: Smernice za tehnične specifikacije Francisovih turbin

General Information

Status
Published
Publication Date
31-Mar-1999
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Apr-1999
Due Date
01-Apr-1999
Completion Date
01-Apr-1999

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SIST IEC/TR 61366-2:1999
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SLOVENSKI STANDARD
SIST IEC/TR 61366-2:1999
01-april-1999
9RGQHWXUELQHDNXPXODFLMVNHþUSDONHLQþUSDOQHWXUELQH±5D]SLVQDGRNXPHQWDFLMD
±GHO6PHUQLFH]DWHKQLþQHVSHFLILNDFLMH)UDQFLVRYLKWXUELQ

Hydraulic turbines, storage pumps and pump-turbines - Tendering Documents - Part 2:

Guidelines for technical specifications for Francis turbines
Ta slovenski standard je istoveten z: IEC/TR 61366-2
ICS:
27.140 Vodna energija Hydraulic energy engineering
SIST IEC/TR 61366-2:1999 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST IEC/TR 61366-2:1999
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SIST IEC/TR 61366-2:1999
TECHNICAL
IEC
REPORT – TYPE 3
61366-2
First edition
1998-03
Hydraulic turbines, storage pumps
and pump-turbines –
Tendering documents –
Part 2:
Guidelines for technical specifications
for Francis turbines
Turbines hydrauliques, pompes d’accumulation
et pompes-turbines –
Documents d’appel d’offres –
Partie 2:
Guide des spécifications techniques pour les turbines Francis
 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
PRICE CODE
International Electrotechnical Commission
For price, see current catalogue
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SIST IEC/TR 61366-2:1999
– 2 – 61366-2 © IEC:1998(E)
CONTENTS
Pages

FOREWORD ................................................................................................................... 4

Clause

0 Introduction to technical specifications ...................................................................... 7

1 Scope....................................................................................................................... 9

2 Reference documents ............................................................................................... 9

3 Technical requirements............................................................................................. 9

3.1 Scope of work.................................................................................................. 9

3.2 Limits of the contract ....................................................................................... 10

3.3 Supply by Employer ......................................................................................... 10

3.4 Design conditions ............................................................................................ 11

3.5 Technical performance and other guarantees................................................... 14

3.6 Mechanical design criteria ............................................................................... 17

3.7 Design documentation ..................................................................................... 17

3.8 Materials and construction ............................................................................... 18

3.9 Shop inspection and testing ............................................................................. 19

4 Technical specifications for fixed/embedded components.......................................... 20

4.1 Spiral case ...................................................................................................... 21

4.2 Stay ring.......................................................................................................... 21

4.3 Foundation ring ............................................................................................... 22

4.4 Draft tube and draft tube liner .......................................................................... 22

4.5 Pit liner............................................................................................................ 23

5 Technical specifications for stationary/removable components .................................. 23

5.1 Headcover and bottom ring .............................................................................. 23

5.2 Guide vanes .................................................................................................... 24

6 Technical specifications for guide vane regulating apparatus..................................... 24

6.1 Servomotors .................................................................................................... 24

6.2 Connecting rods .............................................................................................. 24

6.3 Regulating ring ................................................................................................ 25

6.4 Guide vane linkage .......................................................................................... 25

6.5 Guide vane overload protection........................................................................ 25

6.6 Locking devices............................................................................................... 25

7 Technical specifications for rotating parts, bearings and seals................................... 25

7.1 Runner ............................................................................................................ 25

7.2 Main shaft ....................................................................................................... 26

7.3 Turbine guide bearing...................................................................................... 26

7.4 Main shaft seal ................................................................................................ 27

7.5 Standstill shaft (maintenance) seal .................................................................. 27

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SIST IEC/TR 61366-2:1999
61366-2 © IEC:1998(E) – 3 –
Clause Page
8 Technical specifications for thrust bearing (when specified as part of

turbine supply).......................................................................................................... 27

8.1 Design data ..................................................................................................... 27

8.2 Bearing support ............................................................................................... 27

8.3 Bearing assembly ............................................................................................ 27

8.4 Oil injection pressure lift system....................................................................... 28

9 Technical specifications for miscellaneous components ............................................ 28

9.1 Walkways, access platforms and stairs ............................................................ 28

9.2 Lifting fixtures.................................................................................................. 28

9.3 Special tools.................................................................................................... 28

9.4 Standard tools ................................................................................................. 28

9.5 Turbine pit hoist............................................................................................... 29

9.6 Nameplate....................................................................................................... 29

10 Technical specifications for auxiliary systems............................................................ 29

10.1 Bearing lubrication system ............................................................................... 29

10.2 Runner pressure balancing and pressure relief lines ........................................ 29

10.3 Turbine pit drainage......................................................................................... 29

10.4 Lubrication of guide vane regulating system ..................................................... 29

10.5 Air admission system....................................................................................... 29

10.6 Tailwater depression system............................................................................ 29

11 Technical specifications for instrumentation .............................................................. 30

11.1 Controls........................................................................................................... 30

11.2 Indication......................................................................................................... 30

11.3 Protection........................................................................................................ 30

12 Spare parts............................................................................................................... 30

13 Model acceptance tests ............................................................................................ 30

14 Site installation and commissioning........................................................................... 31

14.1 General ........................................................................................................... 31

14.2 Installation procedures..................................................................................... 31

14.3 Tests during installation ................................................................................... 32

14.4 Commissioning tests........................................................................................ 32

15 Field acceptance tests .............................................................................................. 32

15.1 Scope and reports ........................................................................................... 32

15.2 Inspection of cavitating pitting.......................................................................... 33

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SIST IEC/TR 61366-2:1999
– 4 – 61366-2 © IEC:1998(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP-TURBINES –
TENDERING DOCUMENTS –
Part 2: Guidelines for technical specifications
for Francis turbines
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.

IEC 61366-2, which is a technical report of type 3, has been prepared by IEC technical

committee 4: Hydraulic turbines.
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SIST IEC/TR 61366-2:1999
61366-2 © IEC:1998(E) – 5 –
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 61366-2 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 specification for Francis turbines (IEC 61366-2)

Part 3: Guidelines for technical specification for Pelton turbines (IEC 61366-3)

Part 4: Guidelines for technical specification for Kaplan and propeller turbines (IEC 61366-4)

Part 5: Guidelines for technical specification for tubular turbines (IEC 61366-5)

Part 6: Guidelines for technical specification for pump-turbines (IEC 61366-6)
Part 7: Guidelines for technical specification for storage pumps (IEC 61366-7)

Parts 2 to 7 are "stand-alone" publications which when used with IEC 1366-1 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.
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SIST IEC/TR 61366-2:1999

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
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SIST IEC/TR 61366-2:1999
61366-2 © IEC:1998(E) – 7 –
HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP-TURBINES –
TENDERING DOCUMENTS –
Part 2: Guidelines for technical specifications
for Francis turbines
0 Introduction to technical specifications

The main purpose of the technical specifications is to describe the specific technical

requirements for the hydraulic machine for which the Tendering Documents (TD) are being

issued. To achieve clarity and to avoid confusion in contract administration, the Employer

should not specify anything in the Technical Specifications which is of importance only to the

preparation of the Tender. Such information and instructions should be given only in the

Instructions to Tenderers (ITT). Accordingly, the ITT may refer to other chapters and sections

of the Tendering Documents but not vice versa. As a general rule the word "Tenderer" should

be confined in use only to TD chapter 1 "Tendering Requirements"; elsewhere the term

"Contractor" should be used.

Special attention should be given to items of a project specific nature such as materials,

protective coating systems, mechanical piping systems, electrical systems and instrumentation.

It is common for the Employer to use technical standards for such items which would apply to

all contracts for a particular project or projects. In this event, detailed technical standards

should be specified in TD chapter 5 "General requirements".

Technical specifications for the various types of hydraulic machines included in this guide are

provided in the following parts:
– Francis turbines (Part 2);
– Pelton turbines (Part 3);
– Propeller and Kaplan turbines (Part 4);
– Tubular turbines (Part 5);
– Pump-turbines (Part 6);
– Storage pumps (Part 7).

The guidelines for preparation of Francis turbine specifications include technical specifications

for the following:

– Design conditions: Project arrangement, hydraulic conditions, specified conditions, mode of

operation, generator characteristics, synchronous condenser characteristics, transient

behaviour data, stability of the system, noise, vibration, pressure fluctuations and safety

requirements.
– Technical performance and other guarantees:
ypower;
ydischarge;
yefficiency;
ymaximum momentary pressure;
yminimum momentary pressure;
ymaximum momentary overspeed;
ymaximum steady state runaway speed;
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SIST IEC/TR 61366-2:1999
– 8 – 61366-2 © IEC:1998(E)
ycavitation pitting;
yhydraulic thrust;
ymaximum weights and dimensions for transportation, erection and maintenance.

– Mechanical design criteria: design standards, stresses and deflections and special design

considerations (earthquake acceleration, etc.).

– Design documentation: Contractor’s input needed for the Employer's design, Contractor's

drawings and data, Contractor's review of the Employer's design and technical reports by

Contractor.

– Materials and construction: material selection and standards, quality assurance procedures,

shop methods, corrosion protection and painting.

– Shop inspection and testing: general requirements and reports, material tests and

certificates, dimensional checks, shop assembly and tests.

– Fixed/embedded components: spiral case with compressible wrapping (if any), stay ring,

foundation ring, discharge ring, draft tube, draft tube liner, pit liner, and foundation plates

and anchorage.

– Stationary removable components: headcover, bottom ring (may be fixed), facing plates,

stationary wearing ring, guide vanes.

– Regulating apparatus for guide vanes: servomotor, connecting rods, regulating ring, guide

vane linkage system, guide vane overload protection and locking devices.

– Rotating parts, bearings and seals: runner, main shaft, intermediate shaft, guide bearing

with oil supply, oil/water cooler, main shaft seal, standstill (maintenance) shaft seal.

– Thrust bearing (when part of the hydraulic machine supply): bearing support, thrust block,

rotating ring, thrust bearing pads and pivots, oil sump with oil supply (common with guide

bearing, if any), oil/water coolers, instrumentation.

– Miscellaneous components: walkways, lifting fixtures, special tools, standard tools, turbine

pit hoist, nameplate, draft tube maintenance platform.

– Auxiliary systems: runner pressure balancing and pressure relief lines, turbine pit drainage

and other drainage systems; lubrication, draft tube air admission, tailwater depression,

cooling water supply for runner seal for blow-down operation.
– Instrumentation: controls, indication and protection.
– Spare parts: basic spare parts.
– Model tests: test requirements.

– Site installation and commissioning: installation procedures and commissioning tests.

– Field acceptance tests: scope of field tests, reports and inspection of cavitation pitting.

An example of the proposed table of contents for Tendering Documents for a Francis turbine is

given in annex A. The example does not include technical specifications for the control system,

relief valves, or high and low pressure side valves or gates which, at the Employer's option,

may be included in the Tendering Documents for the Francis turbine, or may be specified in

separate documents.

Chapter 6 (technical specifications) of the Tendering Documents should be arranged as

follows:
6.1 Technical requirements;
6.2 Technical specifications for fixed/embedded components;
6.3 Technical specifications for stationary/removable components;
6.4 Technical specifications for guide vane regulating apparatus;
6.5 Technical specifications for rotating parts, guide bearings and seals;
6.6 Technical specifications for thrust bearing;
6.7 Technical specifications for miscellaneous components;
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SIST IEC/TR 61366-2:1999
61366-2 © IEC:1998(E) – 9 –
6.8 Technical specifications for auxiliary systems;
6.9 Technical specifications for instrumentation;
6.10 Spare parts;
6.11 Model acceptance tests;
6.12 Site installation and commissioning;
6.13 Field acceptance tests.
1 Scope

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. This part of IEC 61366 provides guidelines for Francis turbines.
2 Reference documents

IEC 60041:1992, Field acceptance tests to determine the hydraulic performance of hydraulic

turbines, storage pumps and pump-turbines

IEC 60193:1965, International code for model acceptance tests of hydraulic turbines

IEC 60308:1970, International code for testing of speed governing systems for hydraulic

turbines

IEC 60609:1978, Cavitation pitting evaluation in hydraulic turbines, storage pumps and pump-

turbines

IEC 60994:1991, Guide for field measurement of vibrations and pulsations in hydraulic

machines (turbines, storage pumps and pump turbines)
IEC 61362, Guide to specification of hydro-turbine control systems

ISO 3740:1980, Acoustics – Determination of sound power levels of noise sources – Guidelines

for the use of basic standards and for the preparation of noise test codes
3 Technical requirements
3.1 Scope of work

This subclause should describe the scope of work and the responsibilities which are to be

conferred upon the Contractor. The general statement of scope of work presented in TD

section 2.1 (5.1 of IEC 61366-1) shall be consistent with what is presented here. In a similar

manner, pay items in the tender form, TD section 1.2 (4.2) should be defined directly from TD

subsection 6.1.1.

The scope of work should begin with a general statement which outlines the various elements

of the work including (where applicable) the design, model testing, supply of materials and

labour, fabrication, machining, quality assurance, quality control, shop assembly, shop testing,

spare parts, transportation to site, site installation, commissioning, acceptance testing,

warranty and other services specified or required for the items of work.

The general statement should be followed by a specific and detailed list of the major items

which the Employer wishes to have as separate payment items in the tender form, for example:

___________
To be published.
All references to Tendering Documents (TD) apply to annex A of IEC 61366-1.
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SIST IEC/TR 61366-2:1999
– 10 – 61366-2 © IEC:1998(E)
Item Description

1 six (6) vertical shaft Francis type hydraulic turbines each with a specified power of not

less than 102 000 kW under a specified specific hydraulic energy of 1 960 J/kg
(specified head of 200 m);
2 turbine model testing;
3 tools, slings and handling devices required for maintenance of the turbines;
4 transportation and delivery to site;
5 site installation, commissioning and acceptance testing of the turbines;
6 preparation and submission of operation and maintenance manual and training of
Employer's operating and maintenance staff in optimum use of these manuals; and
7 Spare parts required for operation and maintenance.
3.2 Limits of the contract

This subclause, by making reference to the Employer's drawings and data, should describe in

detail the limits of the Contract considering the following:

– details of the design and supply limits of the high and low pressure sides of the machine;

– details, location and responsibility for field connection to spiral case and penstock or valve

on the high-pressure side;
– details and location of the downstream termination of the draft tube liner;
– details and location of gate(s) or valve(s) on low-pressure side;
– orientation and location of the turbine/generator shaft interface;

– responsibility for supply and installation of flange coupling bolts, nuts and guards at

generator/turbine coupling, including drilling jig;

– responsibility for supply and installation of bolts, nuts, gaskets at piping termination;

– termination of governor piping;
– termination of spiral case and draft tube dewatering piping;
– termination of spiral air exhaust piping (if any);
– termination of pit drainage piping;
– termination of bearing lubricating oil piping;

– termination of piping (if required) to carry upper runner seal leakage to the draft tube;

– termination of shaft seal piping (if any);

– termination of piping for air admission system (if any) and for runner pressure balancing

system (if any);
– termination of cooling water piping for bearings;
– turbine headcover mounted thrust bearing (if specified);

– termination points and junction boxes for wiring for power, control, indication, protection,

and lighting;
– compressed air for service and other functions.

NOTE – Contract limits will change if other major items of equipment (such as hydro-turbine control system, turbine

inlet valves, generators, excitation systems, control metering and relaying systems, switchgear, and power

transformers) are included with the turbine equipment in a common set of Tendering Documents.

3.3 Supply by Employer

This subclause should be complementary to 5.6 of IEC 61366-1 (TD section 2.6), and should

list the items and services which will be the responsibility of the Employer. The following items

should be considered:
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SIST IEC/TR 61366-2:1999
61366-2 © IEC:1998(E) – 11 –
– services during site installation and testing;
– temporary enclosures for site storage of turbine parts or for erection;

– installation in primary concrete of small items provided by the Contractor such as anchors,

sole plates, and piping;

– concrete for embedment of turbine components – supply, placement and control, including

monitoring and verification during and after concrete placing by others ;
– grout injection if required either within or around turbine components;
– powerhouse crane and operator;
– connections to powerhouse air, oil and water piping systems;
– supply of filtered water for turbine shaft seal (if by the Employer);
– electrical wiring and hardware external to specified termination points;
– electric motor starters and controls;

– control, annunciation and protection systems external to specified termination points;

– external lubricating oil storage, distribution, and purification systems (if by the Employer);

– lubricants, bearing and governor oil to the Contractor's specifications.

It should be stated that any materials or services required for installation and commissioning of

the units
...

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