1 the replanting of lochaber hydro power station by andrew thick
TRANSCRIPT
![Page 1: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/1.jpg)
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The Replanting of Lochaber Hydro Power Station
by Andrew Thick
![Page 2: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/2.jpg)
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Topics to be covered today
• Scheme modelling;
• Operating capability of Lochaber;
• Turbine selection;
• Penstock works.
![Page 3: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/3.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 4: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/4.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 5: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/5.jpg)
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Spey Dam
![Page 6: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/6.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 7: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/7.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 8: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/8.jpg)
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Laggan Dam
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 10: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/10.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 11: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/11.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 12: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/12.jpg)
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Loch Treig and Dam
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 14: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/14.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 15: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/15.jpg)
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Schematic of the Lochaber Scheme
Loch Laggan & reservoir
Loch Treig
SpillSpill
Gravity Inflows
Gravity Inflows
Power-house
Tailrace
Spill
Surge Chamber
LochLinnhe
Spey reservoir
Penstocks
tunneltunnel
tunnel
![Page 16: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/16.jpg)
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Penstocks, Powerhouse and Smelter
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Simplified Lochaber Scheme Model
QTspill
QP/H
QTin
Laggan
QTin
QTunnel
Treig
QLspill
QLin
QLin
QLin
Qintakes
Qintakes
Gravity Intake Flows are combined with Reservoir Inflows
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Energy Modelling Results
Trial 1 2 3 4 5 6 7
Installed Cap. (MW) 65 80 60 70 80 90 100
Overall Efficiency (%) 75 87 87 87 87 87 87
Headloss Coeff. (k) 0.021 0.0172 0.0172 0.0172 0.0172 0.0172 0.0172
Operating rule Ext Ext Max E Max E Max E Max E Max E
Laggan Spill (mcm) 2,034 1,794 4,160 1,709 1,227 1,074 801
Treig Spill (mcm) 154 121 857 201 54 10 7
Ave. Energy (GWh/yr) 467 569 523 574 581 583 580
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Scheme Operating Capability Diagram
9.3 % Q90.7 % Q
Average Operation
0 % Q100 % Q
No Gravity Inflows
100 % Q0 % Q
Max. Gravity Inflows
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Operating Capability in terms of Loch Treig Level
Note: 90.7% of water from Loch Treig9.3% of water from gravity intakes
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Scheme Operating Capability Diagram
9.3 % Q90.7 % Q
Average Operation
0 % Q100 % Q
No Gravity Inflows
100 % Q0 % Q
Max. Gravity Inflows
![Page 22: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/22.jpg)
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Operating Capability in terms of Surge Shaft Water Level
Penstock Limitation
Note: 90.7% of water from Loch Treig9.3% of water from gravity intakes
![Page 23: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/23.jpg)
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Scheme Operating Capability Diagram
9.3 % Q90.7 % Q
Average Operation
0 % Q100 % Q
No Gravity Inflows
100 % Q0 % Q
Max. Gravity Inflows
![Page 24: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/24.jpg)
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Note: All water from Loch Treig
Operating Capability in terms of Surge Shaft Water Level
![Page 25: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/25.jpg)
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Scheme Operating Capability Diagram
9.3 % Q90.7 % Q
Average Operation
0 % Q100 % Q
No Gravity Inflows
100 % Q0 % Q
Max. Gravity Inflows
![Page 26: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/26.jpg)
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Operating Capability in terms of Surge Shaft Water Level
Note: All water from gravity intakes
![Page 27: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/27.jpg)
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Scheme Operating Capability Diagram
9.3 % Q90.7 % Q
Average Operation
0 % Q100 % Q
No Gravity Inflows
100 % Q0 % Q
Max. Gravity Inflows
![Page 28: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/28.jpg)
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Example Operation exceeding Penstock Pressure Rise Limit
![Page 29: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/29.jpg)
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Turbine Selection
The steps towards to turbine selection were:
• Analysis of historical data of scheme operation
• The number of generating units was selected – 5
• Analysis of operating data from scheme model
• Performance data from tendering suppliers was fed into the scheme model
![Page 30: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/30.jpg)
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Scheme Operation Frequency Plot
![Page 31: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/31.jpg)
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Turbine Selection
The steps towards to turbine selection were:
• Analysis of historical data of scheme operation
• The number of generating units was selected – 5
• Analysis of operating data from scheme model
• Performance data from tendering suppliers was fed into the scheme model
![Page 32: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/32.jpg)
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![Page 33: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/33.jpg)
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Turbine Selection
The steps towards to turbine selection were:
• Analysis of historical data of scheme operation
• The number of generating units was selected – 5
• Analysis of operating data from scheme model
• Performance data from tendering suppliers was fed into the scheme model
![Page 34: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/34.jpg)
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![Page 35: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/35.jpg)
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Turbine Selection
The steps towards to turbine selection were:
• Analysis of historical data of scheme operation
• The number of generating units was selected – 5
• Analysis of operating data from scheme model
• Performance data from tendering suppliers was fed into the scheme model
![Page 36: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/36.jpg)
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![Page 37: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/37.jpg)
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Penstock works
Key aspects of the penstock works were:
• Need to undertake the works minimising shutdown of generation.
• Existing penstock system was very complex.
• In order to maintain double isolation, the penstocks needed to be dewatered sequentially.
• The works were complex with poor access.
• Decision with RTA to laser scan the penstock system and create a 3-D model.
![Page 38: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/38.jpg)
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Multiple buspipes
Numerous Valves
Bifurcations
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Penstock Area – difficult terrain!
![Page 40: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/40.jpg)
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Penstock works
Key aspects of the penstock works were:
• Need to undertake the works minimising shutdown of generation.
• Existing penstock system was very complex.
• In order to maintain double isolation for the penstocks needed to be dewatered sequentially.
• The works were complex with poor access.
• Decision with RTA to laser scan the penstock system and create a 3-D model.
![Page 41: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/41.jpg)
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Survey Point Cloud Data
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AutoCAD 3-D Model
![Page 43: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/43.jpg)
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Project Summary
• The generating plant has been replaced to give 25+ years life extension.
• The water to wire efficiency has been improved from 75% to 90+%.
• Energy production increased from 460 GWh/yr to 600+ GWh/yr.
• The scheme’s capability is better understood and limitations identified.
• The scheme was completed ahead of schedule and is operating successfully with minimal disruption to Smelter operations during construction
![Page 44: 1 The Replanting of Lochaber Hydro Power Station by Andrew Thick](https://reader034.vdocuments.mx/reader034/viewer/2022051401/56649eda5503460f94be9786/html5/thumbnails/44.jpg)
Contact Details
Andrew Thick BEng CEng MIMechE
URS Infrastructure and Environment UK Limited
International House, Dover Place
Ashford
Kent TN23 1HU
United Kingdom
Tel: +44 (0) 1233 658200
Thank you for your kind attention