RAMMAM - III HEP (3 x 40MW)

Salient Technical Features of equipment/systems/services covered in the NIT No CS-5602-305(R2)-9 dated 09.01.2014 are mentioned below. These salient Technical Features are mentioned only to facilitate the prospective bidders to prima-facie understand the requirements under the tender and shall not in any way limit or alter the scope of work and technical features/ specification of equipment/ systems/services covered in the Bidding Documents. Detailed provision in regard of scope of work and technical features/ specification of equipment/systems/services, contained in the bidding Document shall be final and binding.

SALIENT FEATURES OF THE PROJECT

1. LOCATION

Name of the river : Rammam

State : West Bengal

District : Darjeeling

Nearest rail head : New Jalpaiguri/Siliguri

Nearest Airport : Bagdogra

Longitude : 88^o-8’-00”E to 88^o-14’-00”E.

Latitude : 27^o-6’-00”N to 27^o-9’-00”N

2. POWER

Installed Capacity : 3 x 40 MW

3. HYDROLOGY

Type of Scheme : Run-of-River

Catchment area upto the project site : 247 sq.km

Average yield : 686.56 MCM

Maximum/Minimum yield : 1040.37/485.65 MCM

Average annual rainfall : 280 cm

Design Flood : 1825 m³/s

Max. and Min. Temperature : 30°C/3°C

Max. Relative humidity : 100%

Available discharge at 90% : 15.43 m³/s

4. RESERVOIR

Full Reservoir Level (FRL) : 903.00 m

Maximum Drawdown Level (MDDL) : 892.00 m

5. BARRAGE

Length of barrrage : 122.5 m

Top of Barrage : 905.0 m

Height of Barrage : 23m (above u/s apron level)

Number of gated Bays : 5

Type of Gate : Radial (operated by hydraulic

hoists)

Size of Gates : 11 m (L) x 7 m (H)

Stop logs (operated by gantry crane): 1 set for spillway

Crest elevation : 884.00m/882.0m

Width (m) of the top roadway : 6.5m

6. Power Intake

Number : 2 Nos.

Design discharge of intake : 33.00 m³/s

Centre line of intake : 886.175 m

Intake tunnel : D Shaped, 2 Nos. each of dia 2.85m

Number & sizes of gates : 2 nos. of 2.60 m x 2.85 m,

Type of gates : Fixed wheel type

Intake Bulk Head Gate : 1 No. of 2.60 x 2.85 m, fixed wheel

type

7. DESILTING CHAMBER

Type : Underground

Size of the Chamber : 2 Nos.[140 m x 7.50 m x 12.55 m

each ]

Design discharge : 16.50 m³/s

Silt flushing discharge : 4.69 m³/s (for both SFT)

Efficiency of removal : 90%

Particle size to be removed : 0.2 mm & above

8. HEAD RACE TUNNEL

Alignment : Right bank

Length : 8200 m

Shape & Size : Horseshoe 3.5 m diameter

Design discharge : 28.31 m³/s

No. of Adit Gates : 2 (Near Jhepi Khola & Surge Shaft)

9. SURGE SHAFT

Type : Restricted Orifice

Diameter : 14.5 m (finished)

Height : 52.5 m

10. VALVE HOUSE

Size of Valve house : 10.2m X 12.0m X 13.0m

11. PRESSURE SHAFT/PENSTOCK

Nos. : 1

Discharge through pressure shaft : 28.31 m³/s

Diameter of Pressure shaft : 2.7 m, Circular

Length (approx.) : 1526 m

Velocity : 4.88 m/sec

12. POWER HOUSE COMPLEX

Location : Near Barbatia Village in West

Bengal

Type : Surface power house

Size of power house : 73.50 m x22.40 m x 41.6 m

No. of Turbines : Three nos. Vertical Pelton

Rated unit capacity : 40 MW

EL of the Centre line of the Turbine : 400.0 m

Gross Design Head : 499.33 m

Net Design Head : 473.00 m

13. TAIL RACE CHANNEL

Length (m) of tunnel : 740 m

Shape & Size : 4m x 3m cut & cover box section

Tail water level : EL 391.00m (min.), 393.00m (max.)