Tender Call No.: Likhu/GVN/Pkg-03/2012 OLUME III A 1 TABLE OF CONTENTS SALIENT FEATURES 1.0 SCOPE SALIENT FEATURES... 1

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1 Table of contents OLUME III A 1 TABLE OF CONTENTS SALIENT FEATURES 1.0 SCOPE SALIENT FEATURES TRANSPORT LIMITATIONS DEVIATIONS FROM SPECIFICATIONS APPROVAL OF DRAWINGS TRAINING OF EMPLOYER PERSONNEL ICCS- RSWI Vol. III A1 i

2 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 s 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 Peaking Run-of-River Capacity 120 MW Peaking Hours 3 Gross Head m Design Discharge 60 m 3 /s ICCS-RSWI Vol. III A1 1

3 2 LOCATION Project Area River Dam Site 27º28' N / 86º18' E Likhu Khola 150 m downstream of Confluence with Chokti Khola 3 RESERVOIR Full Supply Level (FSL) 1046 a.m.s.l. Maximum Reservoir Level a.m.s.l. Minimum Operation Water Level (MOWL) 1034 a.m.s.l. Gross Storage m 3 Net Storage m 3 4 HYDROLOGY Catchment Area Mean annual flow at Dam Site m³/s 90% exceedance 8.21 m 3 /s 75% exceedance m³/s 50% exceedance m³/s Mean winter (Dec to May) m³/s Design Flood at Dam site (1 in 1000 yrs) 2100 m³/s 5 DIVERSION ARRANGEMENT Coffer Dam Length ( U/S plus D/S) Stone masonry 95 m ICCS-RSWI Vol. III A1 2

4 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 m 3 /s 6 DAM Dam top elevation Average river bed elevation Maximum Height above deepest foundation level Length at Top Concrete Gravity 1050 a.m.s.l a.m.s.l. 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 m Flood discharge 2100 m 3 /s 7 INTAKE Location Maximum Discharge Invert Level Openings (nos x width x height) Gates Stop Log Gate (nos x width x Left bank Side Intake 69 m 3/ s 1026 a. m.s.l. 2 x 3.7 m x 3.7 m Stop log gate and Service gate 2 x 3.7 m x 3.7 m ICCS-RSWI Vol. III A1 3

5 height) Service Gate Size (nos x width x height) Connection to desander Length 2 x 3.7 m x 3.7 m Circular, 3.7 m dia. Pressurized Conduit 108 m 8 DESILTING ARRANGEMENT Underground, Pressurized Size (Nos.x length x width) 2 x 135 m x 14 m Design Discharge 69 m 3 /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. 2 x 2.2 m x 2.2 m x width x height) Flushing Operation mode Continuous Flushing Discharge 9 m 3 /s 9 HEAD RACE TUNNEL (HRT) Total Length (Full Length concrete Lining) 4419 m Diameter 4.8 m, circular Invert Level at start a.m.s.l. Invert Level at end (bottom of surge shaft) a.m.s.l. Bed Slope (average) 1.07% Design discharge m 3/ s Construction Adit 3 No. ICCS-RSWI Vol. III A1 4

6 Adit Length Size of Adits Adit 1=227 m Adit 2=280 m Adit 3=87 m 5.6 m dia, D-shape 10 SURGE SHAFT Diameter Height of lining Orifice diameter at top Restricted orifice Open to sky 2m/17 m m Concrete & Steel Lining 2.0 m 11 VALVE HOUSE Size Height Diameter of valve 12 PRESSURE SHAFT (Inclined) Diameter Length Lining Inclination with horizontal 15m x 10m 17.5 m 4.0 m dia., butterfly valve Inclined 4 m 147 m Steel Lining 45 degrees 13 PRESSURE SHAFT (Horizontal) Total Length Lining Diameter Upper and Lower 878 m Steel Lining 4 m 14 POWERHOUSE Length x Width x Height (Includes Service Bldg.) Surface 81.9 m x 30 m x m ICCS-RSWI Vol. III A1 5

7 Foundation Conditions Levels Centre line of unit Generator Floor Service Bay/Operating Floor Control Room Utility Room Rock/Soil a.m.s.l a.m.s.l a.m.s.l a.m.s.l a.m.s.l. 15 TAIL RACE STRUCTURE RCC Open Rectangular Structure Length 53 m Size (Width x Height) 38.8 m x 10 m Slope 1:5000 of flow Free Flow 16 GENERATION PLANT Installed Capacity 3X40 MW Turbine vertical shaft Francis Number 3 Rated Head m Rated Discharge 20 m³/s Speed 375 rpm Generator Number 3 Voltage 11 kv Transformer Number Capacity Rated Voltage Single Phase 10 (including one spare) 18.5 MVA 11/ (220 / 3 )kv ICCS-RSWI Vol. III A1 6

8 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 s Lattice 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 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 m x 11.5 m and GIS building size 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 m and rated design discharge of 20 m 3 /s. The speed of turbines is fixed at 375 rpm. ICCS-RSWI Vol. III A1 7

9 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. ICCS-RSWI Vol. III A1 8

10 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. ICCS-RSWI Vol. III A1 9

11 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. ICCS-RSWI Vol. III A1 10

6) Penstocks 3.25m dia and 965m long to lead a design discharge of cumecs

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