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eLibrary > BS EN 62256:2008 Hydraulic turbines, storage pumps and pump-turbines. Rehabilitation and performance improvement >

BS EN 62256:2008 Hydraulic turbines, storage pumps and pump-turbines. Rehabilitation and performance improvement, 2008

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BS EN 62256:2008 Hydraulic turbines, storage pumps and pump-turbines. Rehabilitation and performance improvement, 2008

iec62256.pdf [Go to Page]
English [Go to Page]
CONTENTS
INTRODUCTION
1 Scope and object
2 Nomenclature
3 Reasons for rehabilitating [Go to Page]
3.1 General
3.2 Reliability and availability increase
3.3 Life extension and performance restoration
3.4 Performance improvement
3.5 Plant safety improvement
3.6 Environmental, social and regulatory issues
3.7 Maintenance and operating cost reduction
3.8 Other considerations
4 Phases of a rehabilitation project [Go to Page]
4.1 General
4.2 Decision on organization
4.3 Level of assessment and determination of scope
4.4 Contractual issues
4.5 Execution of project
4.6 Evaluation of results and compliance with guarantees
5 Scheduling, cost analysis and risk analysis [Go to Page]
5.1 Scheduling
5.2 Economic and financial analyses
5.3 Risk analysis
6 Assessment and determination of scope of the work [Go to Page]
6.1 General
6.2 Assessment of the site
6.3 The assessment of the turbine
6.4 The assessment of related equipment
7 Hydraulic design and performance testing options [Go to Page]
7.1 General
7.2 Computational hydraulic design
7.3 Model tests
7.4 Prototype performance test
8 Specifications [Go to Page]
8.1 General
8.2 Reference standards
8.3 Information to be included in the tender documents
8.4 Documents to be developed in the course of the project
Bibliography
Figures [Go to Page]
Figure 1 – Flow diagram depicting the logic of the rehabilitation process
Figure 2 – Critical zones for cracks “A” and “B” in Pelton runner buckets
Figure 3 – Relative efficiency versus relative output – Original and new runners
Figure 4 – Relative efficiency versus output – Original and new runners – Outardes 3 generating station
Figure 5 – Efficiency and distribution of losses versus specific speed for Francis turbines (model) in 2005
Figure 6 – Relative efficiency gain following modification of the blades on the La Grande 3 runner, in Quebec, Canada
Figure 7a – Potential efficiency improvement for Francis turbine rehabilitation
Figure 7b – Potential efficiency improvement for Kaplan turbine rehabilitation
Figure 8 – Cavitation and corrosion-erosion in Francis runner
Figure 9 – Back side erosion of the entrance into a Pelton bucket
Figure 10 – Leading edge cavitation erosion on a Françis pump-turbine caused by extended periods of operation at very low loads
Figure 11 – Severe particle erosion damage in a Francis runner
Tables [Go to Page]
Table 1 – Expected life of a hydropower plant and its subsystems before major work
Table 2 – Assessment of turbine embedded parts – Stay ring
Table 3 – Assessment of turbine embedded parts – Spiral or semi-spiral case
Table 4 – Assessment of turbine embedded parts – Discharge ring
Table 5 – Assessment of turbine embedded parts – Draft tube
Table 6 – Assessment of turbine non-embedded, non-rotating parts – Headcover
Table 7 – Assessment of turbine non-embedded, non-rotating parts – Intermediate and inner headcovers
Table 8 – Assessment of turbine non embedded, non rotating parts – Bottom ring
Table 9 – Assessment of turbine non embedded, non rotating parts – Guide vanes
Table 10 – Assessment of turbine non embedded, non rotating parts – Guide vane operating mechanism
Table 11 – Assessment of turbine non embedded, non rotating parts – Operating ring
Table 12 – Assessment of turbine non embedded, non rotating parts – Servomotors
Table 13 – Assessment of turbine non embedded, non rotating parts – Guide bearings
Table 14 – Assessment of turbine non embedded, non rotating parts – Turbine shaft seal (mechanical seal or packing box)
Table 15 – Assessment of turbine non embedded, non rotating parts – Thrust bearing support
Table 16 – Assessment of turbine non embedded, non rotating parts – Nozzles
Table 17 – Assessment of turbine non embedded, non rotating parts – Deflectors and energy dissipation
Table 18a – Assessment of turbine rotating parts – Runner
Table 18b – Assessment of turbine rotating parts – Runner
Table 18c – Assessment of turbine rotating parts – Runner
Table 19 – Assessment of turbine rotating parts – Turbine shaft
Table 20 – Assessment of turbine rotating parts – Oil head and oil distribution pipes
Table 21 – Assessment of turbine auxiliaries – Speed and load regulation system (governor)
Table 22 – Assessment of turbine auxiliaries – Turbine aeration system
Table 23 – Assessment of turbine auxiliaries – Lubrication system (guide vane mechanism)
Table 24 – Francis turbine potential efficiency improvement (%) for runner profile modifications only
Table 25 – Potential impact of design and condition of runner seals on Francis turbine efficiency with new replacement runner or rehabilitated runner (%)
Table 26 – Potential total gain in efficiency from the replacement of a Francis turbine runner including the blade profile improvements, the restoration of surface condition and the reduction of seal losses
Table 27 – Potential Additional Efficiency Improvement by Rehabilitation/Replacement of Other Water Passage Components on a Francis Turbine (%)
Table 28 – Assessment of related equipment – Governor
Table 29 – Assessment of related equipment – Generator and thrust bearing
Table 30 – Assessment of related equipment – Penstock and turbine inlet valves
Table 31 – Assessment of related equipment – Civil works
Table 32 – Assessment of related equipment – Crane, erection equipment [Go to Page]

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BS EN 62256:2008 Hydraulic turbines, storage pumps and pump-turbines. Rehabilitation and performance improvement, 2008

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