SECTION-VI: TECHNICAL SPECIFICATIONSbhilwaraenergy.com/tenders/A1- Salient Features Likhu.pdf ·...

Likhu IV HEP – 3 X 40 MW Technical Specification Tender Call No.: Likhu/GVN/Pkg-03/2012 Table of contents

ICCS- RSWI Vol. III A1 i

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

Likhu IV HEP – 3 X 40 MW Technical Specification Tender Call No.: Likhu/GVN/Pkg-03/2012 Salient Features

ICCS-RSWI Vol. III A1 1

1.0 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

Design Discharge 60 m3/s



2 LOCATION

Project Area 27º28' N / 86º18' E

River Likhu Khola

Dam Site 150 m downstream of

Confluence with Chokti Khola

3 RESERVOIR

Full Supply Level (FSL) 1046 a.m.s.l.

Maximum Reservoir Level 1047.5 a.m.s.l.

Minimum Operation Water Level

(MOWL) 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) 95 m



Height 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 60 m

Length at Top 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

Maximum Discharge 69 m3/s

Invert Level 1026 a. m.s.l.

Openings (nos x width x height) 2 x 3.7 m x 3.7 m

Gates Stop log gate and Service gate

Stop Log Gate (nos x width x 2 x 3.7 m x 3.7 m



height)

Service Gate Size (nos x width x

height) 2 x 3.7 m x 3.7 m

Connection to desander

Circular, 3.7 m dia. Pressurized

Conduit

Length 108 m

8 DESILTING ARRANGEMENT

Type Underground, Pressurized

Size (Nos .x length x width) 2 x 135 m x 14 m

Design Discharge 69 m3/s

Particle size to be removed 0.2 mm with 90 % trapping

HRT Gate (D/S of desander) (No.

x width x height) 2 x 3.7 m x 3.4 m

Gate at silt flushing outlet (Bonnet

type with Hydraulic hoisting) (No.

x width x height)

2 x 2.2 m x 2.2 m

Flushing

Operation mode Continuous

Flushing Discharge 9 m3/s

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) 1.07%

Design discharge 60.00 m3/s

Construction Adit 3 No.



Adit Length

Adit 1=227 m

Adit 2=280 m

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 4 m

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 4 m

14 POWERHOUSE

Type Surface

Length x Width x Height (Includes

Service Bldg.) 81.9 m x 30 m x 37.00 m



Foundation Conditions 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

Rated Voltage 11/ (220 / 3 )kV



17 OUT DOOR YARD

Size 29 m x 13 m

Line Termination Arrangement 2 Lines

No of Bays 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.



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.



1.3 DEVIATIONS FROM SPECIFICATIONS

i) 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 APPROVAL OF DRAWINGS

i) 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.



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.

SECTION-VI: TECHNICAL SPECIFICATIONSbhilwaraenergy.com/tenders/A1- Salient Features Likhu.pdf ·...

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