Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Table of contents
OLUME III A 1
TABLE OF CONTENTS
SALIENT FEATURES
1.0
SCOPE .................................................................................................................1
1.1
SALIENT FEATURES ..........................................................................................1
1.2
TRANSPORT LIMITATIONS................................................................................8
1.3
DEVIATIONS FROM SPECIFICATIONS .............................................................. 9
1.4
APPROVAL OF DRAWINGS ...............................................................................9
1.5
TRAINING OF EMPLOYER PERSONNEL......................................................... 10
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Vol. III A1
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
1.0
Technical Specification
Salient Features
SCOPE
The Tenderer shall quote for the scope specified in the Contract including the
“Schedule of Requirements” and shall include in the scope all the equipment and
services required for the project in full and complete shape even though some of
the equipment and services are not specifically mentioned (or) detailed here or
elsewhere so that the units and auxiliaries are functionally complete in all respects.
The Contractor shall perform all such work and/or supply all such items and
materials not specifically mentioned in the Contract but that can be reasonably
inferred from the Contract, as being required for attaining completion of the project,
as if such work and/or items and materials were expressly mentioned in the
Contract.
Bids are invited for 3 Nos. Machines capable of generating 40,000 kW each at
Generator terminals under rated conditions and should have continuous
inherent overload capacity of 15%
The Goods and Services shall meet the stipulations of the Technical Specifications
and other requirements of the Contract.
The final destination for "Goods" to reach is:
Likhu IV Hydro-electric Project (LIVHEP), located on the Likhu River, which
borders Okhaldhunga (left bank) and Ramechap (right bank) Districts in eastern
Nepal.
1.1
SALIENT FEATURES
1 Plant
Type
Peaking Run-of-River
Capacity
120 MW
Peaking Hours
3
Gross Head
244.94 m
60 m3/s
Design Discharge
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Vol. III A1
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Salient Features
2 LOCATION
Project Area
27º28' N / 86º18' E
River
Likhu Khola
150 m downstream of
Dam Site
Confluence with Chokti Khola
3 RESERVOIR
Full Supply Level (FSL)
Maximum Reservoir Level
Minimum Operation Water Level
(MOWL)
1046 a.m.s.l.
1047.5 a.m.s.l.
1034 a.m.s.l.
Gross Storage
791000 m3
Net Storage
559000 m3
4 HYDROLOGY
Catchment Area
Mean annual flow at Dam Site
41.86 m³/s
90% exceedance
8.21 m3/s
75% exceedance
10.24 m³/s
50% exceedance
17.40 m³/s
Mean winter (Dec to May)
11.15 m³/s
Design Flood at Dam site (1 in
1000 yrs)
2100 m³/s
5 DIVERSION ARRANGEMENT
Coffer Dam
Type
Stone masonry
Length ( U/S plus D/S)
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Vol. III A1
95 m
2
Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Height
Technical Specification
Salient Features
0.5m above Dry season flood level
Diversion Conduit
270 m long 4.0 m Dia MS Pipe
Design Discharge Flood (dry
season 1 in 20 year return period)
80 m3/s
6 DAM
Type
Concrete Gravity
Dam top elevation
1050 a.m.s.l.
Average river bed elevation
1013 a.m.s.l.
Maximum Height above deepest
foundation level
Length at Top
60 m
112 m
Gated spillway with Radial gates
Nos.
3
Size
8.0 m x 8.0 m
Crest Elevation
1020 a.m.s.l.
Emergency Spillway (Ungated)
Nos.
2
Length
10.0 m
Crest Elevation
1046.0 m
Flood discharge
2100 m3/s
7 INTAKE
Location
Left bank
Type
Side Intake
69 m3/s
Maximum Discharge
Invert Level
1026 a. m.s.l.
Openings (nos x width x height)
Gates
Stop log gate and Service gate
Stop Log Gate (nos x width x
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2 x 3.7 m x 3.7 m
Vol. III A1
2 x 3.7 m x 3.7 m
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Salient Features
height)
Service Gate Size (nos x width x
height)
2 x 3.7 m x 3.7 m
Circular, 3.7 m dia. Pressurized
Connection to desander
Length
Conduit
108 m
8 DESILTING ARRANGEMENT
Type
Underground, Pressurized
Size (Nos .x length x width)
2 x 135 m x 14 m
69 m3/s
Design Discharge
Particle size to be removed
HRT Gate (D/S of desander) (No.
x width x height)
0.2 mm with 90 % trapping
2 x 3.7 m x 3.4 m
Gate at silt flushing outlet (Bonnet
type with Hydraulic hoisting) (No.
2 x 2.2 m x 2.2 m
x width x height)
Flushing
Operation mode
Continuous
9 m3/s
Flushing Discharge
9 HEAD RACE TUNNEL (HRT)
Total Length (Full Length concrete
Lining)
4419 m
Diameter
4.8 m, circular
Invert Level at start
1027.2.00 a.m.s.l.
Invert Level at end (bottom of
surge shaft)
980.00 a.m.s.l.
Bed Slope (average)
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1.07%
Design discharge
60.00 m3/s
Construction Adit
3 No.
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Salient Features
Adit 1=227 m
Adit 2=280 m
Adit Length
Adit 3=87 m
Size of Adits
5.6 m dia, D-shape
10 SURGE SHAFT
Type
Restricted orifice Open to sky
Diameter
2m/17 m
Height
60.00 m
Type of lining
Concrete & Steel Lining
Orifice diameter at top
2.0 m
11 VALVE HOUSE
Size
15m x 10m
Height
17.5 m
Diameter of valve
4.0 m dia., butterfly valve
12 PRESSURE SHAFT (Inclined)
Type
Inclined
Diameter
4m
Length
147 m
Lining
Steel Lining
Inclination with horizontal
45 degrees
13 PRESSURE SHAFT (Horizontal)
Type
Upper and Lower
Total Length
878 m
Lining
Steel Lining
Diameter
4m
14 POWERHOUSE
Type
Surface
Length x Width x Height (Includes
Service Bldg.)
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81.9 m x 30 m x 37.00 m
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Foundation Conditions
Technical Specification
Salient Features
Rock/Soil
Levels
Centre line of unit
799.34 a.m.s.l.
Generator Floor
804.20 a.m.s.l.
Service Bay/Operating Floor
808.40 a.m.s.l
Control Room
812.60 a.m.s.l.
Utility Room
800.00 a.m.s.l.
15 TAIL RACE STRUCTURE
Type
RCC Open Rectangular Structure
Length
53 m
Size (Width x Height)
38.8 m x 10 m
Slope
1:5000
Type of flow
Free Flow
16 GENERATION PLANT
Installed Capacity
3X40 MW
Turbine
vertical shaft
Type
Francis
Number
3
Rated Head
232.00 m
Rated Discharge
20 m³/s
Speed
375 rpm
Generator
Number
3
Voltage
11 kV
Transformer
Type
Single Phase
Number
10 (including one spare)
Capacity
18.5 MVA
11/ (220 /
Rated Voltage
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3 )kV
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Salient Features
17 OUT DOOR YARD
Size
29 m x 13 m
Line Termination Arrangement
No of Bays
2 Lines
2
18 TRANSMISSION LINE
Voltage
220 kV
Conductor
Zebra
No of Circuits
Double Circuit
Tower Types
Lattice Type Tower
Length
22 Km(aprox.)
Power House
The surface powerhouse has a size of 81.9 m x 30.0 m (L x B) to house three 40.0 MW
vertical Francis turbine/generator units, spaced at 15.7 meters. A service bay of size 20
m x 17.95 m (L x B) has been provided adjacent to the power house. The control room,
office and battery room are accommodated opposite of the service bay. Transformer hall
of size 65.75 m x 11.5 m and GIS building size 26.375 m x 11.5 m has been provided on
downstream side of powerhouse with. The draft tube gates, tail pool and tailrace
structure are provided to pass the discharge back to the Likhu River from the power
house.
Plant & Machinery
Hydraulic Turbine
Three Francis turbines (vertical axis), each with unit output of 40 MW are selected for
rated net head 232.0 m and rated design discharge of 20 m3/s. The speed of turbines is
fixed at 375 rpm.
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Salient Features
Hydro Generators
The Generator will be vertical shaft synchronous machine with umbrella type bearing
arrangement capable of giving maximum
output of 46 MW (51.12 MVA) having
rotational speed of 375 rpm to match with that of the turbine. Generator parameters are
as under;
•
Maximum capacity
46 MW (51.12 MVA)
•
Power factor
0.9
•
Nominal Active Power
40 MW
•
Maximum Continuous active power
46 MW
•
Rated Frequency
50 Hz
•
Number of Poles
Sixteen
Generator Transformers
Ten nos.18.5 MVA 11/ (220/√3) kV single phase step - up Power Transformers will be
installed with one as spare.
Each of three generators will be directly connected to a bank of 3 x 18.5 MVA single
phase transformers forming a three phase step up generator-transformer. Each main
power transformer unit comprise of 3 single phase, oil immersed outdoor type and
OFWF cooling type transformers.
1.2
TRANSPORT LIMITATIONS
The equipment shall be manufactured and supplied so as to suite transport
limitations of 40 T including Trailor weight for heaviest package and 3.2 m (W) x
4.8 m (H) including trailor height X 8.5 m(L) including tractor trailer.
INTERCHANGEABILITY
All similar component parts of similar equipment supplied shall be interchangeable
with one another.
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
1.3
i)
Technical Specification
Salient Features
DEVIATIONS FROM SPECIFICATIONS
Should the Tenderer wish to depart from these specifications, he shall submit a
complete and itemized list of such departures together with full particulars of the
reasons for the departures in a separate schedule with reference to section and
paragraph numbers of these tender specifications along with this Bid.
ii) Unless this is done the Goods offered shall be deemed to comply in every respect
with this Bid document. The statement of departures shall be made as a separate
Schedule to the Tender.
1.4
i)
APPROVAL OF DRAWINGS
Successful Tenderer shall start submitting all relevant drawings (both hard & soft
copies) for fabrication/ installation along with design calculations of components of
E & M equipment within 4 weeks from the issuance of Notification of award of
contract, for approval. The approval of the drawings shall be accorded within 2
weeks of receipt of the drawings.
After approval of the drawing by the
Employer/Engineer, each drawing becomes contract drawing and such 6 copies
of approved drawings shall be sent. Within 1 week of receipt of approval to
commence manufacture of the Goods. The Contractor shall not depart from
contract drawings except by the written permission of the Employer/Engineer.
ii) Any manufacture performed prior to the approval of drawings will be at the
Contractor’s risk.
iii) When revised drawings are submitted for approval, the changes from the previous
submitted drawings shall be clearly identified on the drawings, with every revision
made during the life time of the Contract shown by number, date and subject in a
revision block and its notation shall be given in the drawing margin. The drawings
shall be clear and legible in all respects.
iv) The drawings shall be clear, facilitating easy identification of all parts with part
number for ordering of spares by the Employer without referring to Contractor.
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Likhu IV HEP – 3 X 40 MW
Tender Call No.: Likhu/GVN/Pkg-03/2012
Technical Specification
Salient Features
v) Approval of the drawings will not relieve the Contractor of his responsibility for the
correctness of the design and construction of the plant, guarantees and
warrantees on the performance of the Goods as per the terms and conditions of
the specifications.
vi) All drawings must be prepared on AutoCAD2002 and supplied in floppy / CD also
along with six blue prints for each drawing.
1.5
TRAINING OF EMPLOYER PERSONNEL
The contractor shall give training to the Employer personnel in full extend for
complete practical training for operation and maintenance, repair of equipment at
its works as well as site also.
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