INFORMATION FOR BIDDERS
1.0
INTRODUCTION
Himachal Pradesh is situated in the North-West corner of India in the lap of the
Himalayan ranges. It is surrounded by Jammu and Kashmir in the North,
Uttranchal/Uttar Pradesh in the South-East, Haryana in the South and Punjab in the
West. The state is almost entirely mountainous with altitudes ranging from 460m to
6600 m above sea level. The normal rainfall is 181.6cm. Himachal Pradesh is
drained by a number of rivers and rivulets. Five major river systems namely are the
Chenab, the Ravi, the Beas, the Satluj and the Yamuna, which eminate from the
western Himalayas. All the rivers are snow fed and hence perennial. The natural
reservoirs and the large drops available in the river courses provide immense
potential for hydel power generation at low cost.
Himachal Pradesh is blessed with abundant water resources. The assessed
hydroelectric potential of the country in terms of schemes considered feasible for
development is about 500 billion units. Out of this potential, nearly 160 billion units
i.e. 32 percent, lies in the northern region. Himachal Pradesh with its estimated
power potential of more than 20,000 MW, in its five river basins, itself accounts for
nearly 100 billion units.
The Himachal Pradesh State Electricity Board Limited, a company, registered under
companies act with its head office at Vidyut Bhawan, Shimla-171004 (hereinafter
referred to as the HPSEBL/ Owner), is responsible for promoting the co-ordinated
development of power potential, generation, transmission and distribution of
electricity within the State in most efficient and economical manner.
2.0
PROJECT IMPLEMNTATION
Himachal Pradesh State Electricity Board has undertaken the repair and renovation
of electromechanical equipment of Rongtong Power House. Major cost of the works
shall be financed with the 13th Financial commission Grant for strengthening of
electricity infrastructure in Border blocks of HP.
2.1
PROJECT DETAILS
Rongtong Power House is located in Lahul Spiti District of Himachal Pradesh. Power
House is at Rangrik which is about 5 Km from Kaza Town on left bank of Rongtong
Nallaha. Kalka Railway station is the nearest broad gauge railway station and is
about 550 Km. from Kaza by road. Whereas Shimla is the nearest narrow gauge
railway station which is about 450 Km. from Kaza by road. Kalka is connected by
National Highway ( NH 22) via Shimla upto Wangtoo which is 280 Km. from Kalka.
All consignments will have to be despatched to Kalka Railway station (if opted to be
transported from ex-works to site through railway where un-loading facilities are
available). The other option available is to transport the equipment directly from exworks to site by road transport.
The Rongtong Small Hydro Project is located in hilly area of Himachal
Pradesh. The catchment area of the Rongtong Nallah is 265 Sq. km. and is entirely
snow-fed. The detailed discharge data of the stream are not available. Estimated
design discharge is 3.42 m3/sec available for 50% of time in the year. The works of
Rongtong SHP were commenced in 1976-77 and the Power House was
commissioned during December, 1986.
1
3
SALIENT FEATURES :
1.
i)
ii)
iii)
iv)
LOCATION
State
District
Village
Access Road
v)
vi)
Nearest Rail Head
Nearest airport
2.
METEREOLOGY
i)
ii)
Altitude
Temperature
3.
HYDROLOGY
Himachal Pradesh
Lahaul & Spiti
Spiti Valley
Power House about 3 km
from Kaza town on left
bank of Rongtong Nallaha
Shimla 450 km
Shimla 450 km
3600 meters above M.S.L
(-) 40* C to (+) 30* C
i)
ii)
River
Catchments area above diversion
Weir
iii)
iv)
v)
Mean annual rainfall in catchments 113 mm
Mean annual run off
0.0975 x 10 Hect. M
Design discharge
4.25 Cumecs
4.
Rongtong Nallah
265 Sq. km
DIVERSION AND INTAKE STRUCTURES
i)
Type
ii)
iii)
iv)
Length of weir
No. of bays
Bed level at weir site
Crated weir with concrete
cut off on face
10 m
14 Nos.
3688.384 m
5.
WATER CONDUCTOR SYSTEM
5.1
From Rd 148 to 301 m & 340 to 938 m
i)
ii)
iii)
iv)
v)
vi)
Type
Width
Total length
Bed slope
Height
Max. Velocity
5.2
Desilting Tank at RD 301 m
i)
ii)
iii)
iv)
v)
vi)
vii)
Length
Width at center
Side slope
Up stream transition length
Down stream transition length
No. of hoppers
Drain pipe diameter
R.C.C. Box Section
1.9 m
749.583 m
1 in 900
1.9 m
1.325 m/sec
39.9 m
4.00 m
Vertical
5.0 m
2.5 m
6 Nos.
300 mm
2
viii)
Height of structure
5.9 m
5.3
From RD. 1192 to 3273 m
i)
Type
ii)
iii)
Width
Length
iv)
v)
Max. Velocity
Fully supply depth flow
5.4
From RD 938 to 1192 m
i)
ii)
iii)
Type
Length
Section
6.
FOREBAY/RESEVOIR
i)
ii)
iii)
iv)
v)
vi)
vii)
viii)
Average length
Average width
Bed slope
Bed level
Top forebay level
Full supply level
Free board
Storage capacity
7.
PENSTOCK
i)
Number
ii)
iii)
Total length
Internal dia
iv)
v)
Design discharge
Liner thickness
8.
POWER HOUSE
i)
ii)
iii)
iv)
Size of building
Installed capacity
No. of Units
Floor elevation
9.
TURBINE
i)
ii)
No. of turbines
Type of turbine
iii)
Setting
4 (four)
400 HFIV-500, Francis
turbine Jyoti Make.
Horizontal
iv)
v)
Turbine output
Net head
750 HP
79 meters
R.C. rectangular with R.C.C.
Sleepers over it
1.9 m
2080.637 m Height 2.16 m
Bed slope 1 in 900.
1.325 m/sec
1.41 m
Tunnel
254.243 m
RCC D-shaped with
2.05 m finished dia
120 m
45.00 m
Horizontal bed
3676.86 m
3685.00 m
3683.5 m
1.50 m
18000 m3
One (Branching into four
near PH)
502.982(inclined length)
1.2 m and 0.70 m in
branching.
3.424 m3/sec
8 mm to 14 mm
37.525 x 16.75 m
2000 kW
4 of 500 kW each
3599.915 m
3
vi)
vii)
viii)
ix)
x)
xi)
Rated speed
Runaway speed
Specific speed
Runner Diameter
BF valve diameter
Spiral inlet diameter
10.
GENERATOR
i)
ii)
No. of generator
Type
iii)
Continuous rated output at rated
power factor, rated speed and rated
voltage with temperature rise
within class-B limit above ambient
temp. of 20 C
Power Factor
Frequency
Speed
Maximum speed (runaway speed)
at which all parts are guaranteed to
withstand safely
Phases
Voltage between phases
Amperes per phase
iv)
v)
vi)
vii)
viii)
ix)
x)
1000 rpm
1700 rpm
116.3 rpm
414 mm
500 mm
414 mm
4 (four)
Salient pole type synchronous
alternator horizontally mounted
two bearings
625 kVA
0.8 lag
50 Hz
1000 r.p.m.
1700 r.p.m.
Three
415 Volts
870 A
4
Details of existing electro-mechanical equipment : Details given hereunder are
indicative only. Bidders shall visit the site before bidding and make own assessment.
4.1
Electromechanical Equipments
b)
Butterly Valves
Butterfly valves have been provided to shut off the turbines in case of emergency viz
oil pump belt breaks, pendulum belt breaks or electrical fault appears. The valve
consists of body, disc, operating mechanism with weight for closure and inlet/outlet
dismantling pipes. Butterfly valves of all the four machines are presently being
manually opened with the help of chain-pulley blocks and kept open by chain pulley
block. The closure of the valves is facilitated by counter weight provided on the valve
spindle and releasing the chain pulley block. Therefore, It is not possible to shut
down the turbines automatically through butterfly valves under any emergency
condition. This causes over speeding of machines frequently leading to be damage
of thrust pads, scratching of shafts etc.
c)
Turbines
The turbines are horizontal shaft Francis turbine directly coupled with generators
designed and supplied by M/s Jyoti. Ltd. Baroda (Gujarat). Each turbine consists of
spiral casing with integral stay ring, guide apparatus with regulating mechanism,
turbine shaft, runner, shaft gland seal, pedestal type thrust cum guide bearing,
pedestal type 2nd guide bearing, coupling for turbine and generator, flywheel & pulley,
discharge pipe and draft tube etc.
4
Spiral Casings:- Spiral casing is cast fabricated with integral stay ring. The joints of
spiral casing with butterfly valve outlet pipe and draft tube bend pipe are leaking in
both the running units. The outer and inner surfaces of the casing are severely
corroded.
Guide Apparatus:- Guide apparatus consists of turbine cover, lower ring, twelve
guide vanes with upper/lower bushes, levers, lings and regulating ring. Guide vanes
feather of all machines have repaired a number of times resulting in change in their
original profile and other dimensions. It is observed that all the guide vanes do not
close properly and opening between consecutive guide vanes are not uniform. This
leads to non uniform flow of water, reduced efficiency and increased vibrations of the
machines.
Excessive Water Leakage:- There is substantial loss in generation due to excessive
water leakages from the following components :
(i)
(ii)
(iii)
(iv)
(v)
Sluice valves.
Butterfly valve joints
Turbine gland seal and guide vane bushes
Guide bearing cooling system.
Joints of spiral casing with discharge pipe on draft tube side.
d)
Governors
Hydro-mechanical type Governors manufactured by M/s Jyoti Ltd. Baroda have been
provided for all the machines. These Governors comprise of belt driven oil pumps,
separate belt driven pendulum for speed sensing, oil distribution valve, dashpot, built
in servomotor, feed-back arrangement and hand-wheel etc. All control functions of
the Governor like speed control, speed droop, gate limits etc. are done manually.
These Governors do not have emergency shut-down devices to close the turbine
gates. The major operational problems with regard to these governors are listed
below:





The pendulums of all the governors are out of service making speed indication
and control impossible.
Synchronizing of machines with the grid poses lot of problems as adjusting speed
and load through remote control from the switch board is not possible. Also,
precise control of guide vane opening directly through manual limiter is not
possible due to sluggish operation.
The machines have the tendency to over-speed due to failure of these governors
to act when there is sudden load throw-off.
These Governors have not been designed to take care of emergency shut-down.
The frequent belt slippages impair the operations.
e)
Lubricating System
f)
The belt driven lubricating oil system for turbine guide and thrust bearing is presently
in working order but it may be worn out and obsolete. Due to increased thrust and
inadequate/improper lubrication, thrust cum guide bearing gets damaged more
frequently necessitating repairs at short intervals.
Bearing Cooling Water System
Fine silt accompanying water get deposited over the inner lining of cooling water
pipes. The chocking of cooling pipes in this fashion results in temperature rise of
5
bearings beyond permissible limits and the machines have to put under forced
shutdown. Similar situation also arises in extreme winter due to icing of water in
cooling pipes. There have also been instance of damage to thrust/journal bearing
pads due to these reasons. During winter, only one machine is operative due to low
discharge and other machines have to be kept idle. While idling, the cooling pipes of
these machines sometimes burst due to temperature differential. Extensive damage
was caused to machine No. IV due to icing of water in turbine casing while not in
operation. The turbine casing was uprooted from the foundation due to shearing of
foundation bolts. In view of urgency of maintaining the power supply of the area and
difficulties in obtaining spares due to inaccessibility of the site particularly during
winter, machine No. IV has been cannibalized to keep the other units running.
4.2
Electrical Equipments
a)
Generators & Static Excitation System
Generators:- Four numbers salient pole horizontal type synchronous generators of
M/s Jyoti Ltd. Vadodara make have been installed. The rating of each generator is
625 kVA, 415 V, 50 Hz, 0.8 pf lag, 1000 rpm. Two nos. roller type grease lubricated
bearings are provided in the generator end shields. There is no provision of
temperature measurement of bearing metal. The sleeves have been repaired a
number of times through local contractors. Three generators are in good condition
but one generator has shown open field winding. It may require re-winding whereas
other generators require normal servicing.
Static Excitation System: The panels are designed and manufactured by M/s Jyoti
Ltd. Vadodara. Each unit is provided with its excitation panel. It consists of a full
wave bridge converter for supplying DC voltage to the field of the generator. The
converter voltage can be varied by controlling the firing angle of thrusters. Any
change in alternator output voltage, due to load variation is sensed, rectified and
compared with a fixed reference voltage. The error, thus, obtained adjusts the firing
angle of constant output voltage. Field flushing of generator is done through a 24 V
DC Battery. Though the control system of the static excitation units was duplicated to
provide redundancy and reliability, but at present only one mode and that too in case
of unit I & II is in working order. Moreover there is no manual channel to control the
voltage. The major defects are in the electronic cards. It is however not possible to
procure the requisite spares for these panels as these panels as these are no longer
being manufactured by the original equipment manufacturer.
Neutral Grounding Panel: One neutral grounding panel with four compartments one
for each unit has been provided.
b)
Control And Protection Panels.
i) Unit Control Panels- 4 nos.
Unit control, metering, protection and annunciation panels are of obsolete design.
Large number of components in these panels have developed defects and their
spares are no longer available. LT breakers of generator and transformer are of
obsolete design, their main contacts have worn out due to wear & tear and spares
are not available.
ii) Transformer Control & Protection Panels- 2 nos.
These panels too are of obsolete design. Most of the components have developed
defects making the panels unreliable and their spares are no longer available.
6
iii) Feeder Control Panels- 5 nos consisting of
Incoming Feeder
Outgoing Feeder
Outgoing Feeder
Outgoing Feeder
Spare
-
1
1 for Kaza
1 for Lossar
1 for Taba
1
MOCBs of feeder panels are of obsolete design, their main contacts have worn out
due to wear & tear and their spares are not available. Protection relays and meters
too are of obsolete design and not reliable.
iv) Synchronizing Panel
Has never been used as power house runs in isolation to cater the power
requirement of Spiti Valley.
c)
Unit Transformers:- There are two indoor transformers of 415V/22 kV, 1250 kVA
rating. The transformers are in good condition.
d)
Electrical Auxiliaries
LT AC Supply Board:- For 415 VAC supply to auxiliaries, separate panel has been
provided. The components in this panel are very old design and not reliable.
Station DC Battery System:- Battery bank consists of 24 V, 400 A-H. lead-acid
batteries. The float charger of battery charger is not in working order and at present
DC supply in the Power House is being maintained only through the boost charger.
Boost Charger, Float charger, Switch gear panel, DC distribution panel: These are
full size panels and too bulky for such small application.
e)
Switchyard Equipments
There are presently Four feeders in switch yard – one each for Kaza, Tago and
Kossar The Power House operates in isolation to cater the power requirement of
Spiti Valley only. Its synchronization with the Grid has not been possible as the
nearest control point fork the Grid supply is located more than 180 kms away.
Elevation of pressure transmitter: 3600.646 MSL
5.0
CLIMATE/WEATHER
The project work area (including civil works) lies around 3600m. MSL. The
temperature in the valley varies from -40 degrees C to +30 degrees C.
5.1
CLIMATIC CONDITIONS
6.0
The temperature, conditions at site are given above. Equipment to be designed &
supplied shall be suitable for satisfactory working under these conditions.
SEISMOLOGY
The area is in the Himalayan region and lies between isoseismal VII & VIII to mm
scale which gives a ground acceleration equivalent to 98 to 100 cm/sec2. The table
below indicates earthquake with epicentre located in proximity to project site.
7
Sr.No.
Year and date
Epicentres
Location
Richter
Magnitude
1.
1905 April 4
320-150N
760-150E
8
0
0
0
0
2.
1945 June 22
32 -45 N
76 -30 E
7
3.
1947 July 10
330-00 N
770-80 E
6
4.
1955 April 14
320-440N
760-60 E
5
5.
1958 June 11
320-450N
760-00E
5
6.
1962 June 17
330-180 N
760-120 E
6
Since the area lies in high seismic zone, a suitable seismic co-efficient shall be
provided while designing the structures/ foundations.
7.0
LABOUR AVAILABILITY
Sufficient skilled/unskilled labour may not be available locally. As such, most of the
skilled/unskilled labour may have to be brought from outside. However, the contractor
shall make maximum efforts to explore the availability of local labour of various
categories and employ them to the extent possible. Liaisoning and good relation with
locals is very essential.
8.0
TEMPORARY/TRANSIT ACCOMMODATION
There is acute shortage of accommodation nearby the power house site. HPSEB has
developed some accommodation for its own employees. Contractor has to make his
own arrangement for the temporary/transit accommodation.
9.0
ELECTRIC POWER
Power at 415 V shall be provided to the contractor free of cost in the power house
building.
HPSEB does not undertake to meet with the demand of contractor nor to guarantee
uninterrupted and quality power supply as the area is fed through 22 kV feeders from
Nathpa sub station which is about 200 Km from Kaza. Due to long length of 220 Km
voltage in the area has very poor regulation as such machinery viz. Drilling
machines, welding sets etc. may not work on grid supply. The contractor shall make
his own arrangement for generating sufficient standby power (diesel generator set) to
carry on the works during such or any other shut-off or interruption of power. HPSEB
Ltd. shall not entertain any claim of the contractor on account of any damage or loss
that may be caused to his plant, equipment and machinery and works as a result of
any shut down break down or voltage fluctuations in the power supply. He is
expected to have necessary protection to his electrical equipment and sufficient
standby arrangement.
10.0
CONTROL POINT
HPSEB/ Owner shall provide suitable benchmarks at the location of works with
elevation, horizontal and vertical co-ordinates throughout the project site. The
reference points shall be clearly identified at the ground and properly protected by
8
the contractor against any damage. The contractor shall be responsible to ensure
that these reference points are not interfered with during the course of work and shall
report any suspected damage to the Engineer-in-Charge, who will then check the
accuracy and make any necessary adjustment at the contractor's expenses.
11.0
MATERIAL AND WORKSHOP FACILITIES
All the material required for the main works and auxiliary works including
consumables, steel etc. shall have to be arranged by the contractor. No material shall
be issued by HPSEBL/Owner.
Nearest workshop facilities for carrying out minor machinery jobs etc. will be
available at Rampur/Shimla. For major works, facilities will be available at
Chandigarh, Ludhiana and Batala.
12.0
LAND FOR INFRASTRUCTURE & STORAGE
The contractor shall make his own arrangement for construction of quarters and
other structures including proper facilities required for work at his own cost. Land for
this purpose, as per availability, shall be provided by HPSEBL/ Owner on rent basis
at power house site or any other place within 25 Kms. from the project site. In case of
non-availability of land with HPSEBL, contractor has also to make his own
arrangement to obtain the necessary land for his township, infrastructures, auxiliary
works etc. on lease from the locals.
13.0
LABOUR LICENCE
The contractor shall be required to obtain labour license for deployment of labour
from competent authorities mentioned below: Labour Officer
Rekong Peo, Distt. Kinnaur (H.P.)
The contractor shall strictly adhere to the labour laws and minimum wage act
prevailing in the State of Himachal Pradesh.
14.0
MEDICAL FACILITIES
The contractor shall provide necessary medical facilities at the project site at his own
expenses for his workers.
15.0
WATER SUPPLY
Main source of water at project site are the adjoining Nallahs. Water for construction
and potable water of suitable quality shall have to be arranged by the contractor at
his own cost. These Nallahs near the project site can be tapped for potable water
after seeking permission from Irrigation & Public Health department of the State
Government/Local panchayat.
16.0
MAINTENANCE OF ACCESS ROADS DURING CONSTRUCTION OF THE
PROJECT
9
The maintenance of National High way (NH-22) from Kalka to Wangtoo bridge and
from Sumdoh to Rongtong, the project site is being done by Himachal Public Works
Department and from Wangtoo to Sumdoh by Border Road Organisation. The hill
roads during monsoons and winters are prone to damages and may get blocked due
to landslide etc. In general, Himachal Pradesh Public Works Department and Border
Road Organisation promptly clears such roadblocks and damages. The bidder shall,
however, take into account/ consideration of all such events and no time extension
shall be allowed except when the road is blocked continuously for more than 10 days
at a stretch and the contractor conclusively establishes that this blockage of more
than 10 days has affected movement of his material/ equipment leading to disruption
of his work schedule.
10