BID DOCUMENT NO. ADPL/DL/EPC/01 1750MW DEMWE LOWER ...

1750 MW Demwe Lower HE Project Bid Document Amendment No-1 

Volume/ 

Section 

Vol.I.1 & 2: IFB 

and ITB 

Vol. II.1, Project 

Profile 

Vol. III.2, Part-III 

Bill of Quantities 

Vol IV.3 

Owner’s 

Requirement 

(Technical 

Specifications) 

Hydro- 

Mechanical 

works (Particular 

Technical 

Specifications) 

BID DOCUMENT NO. ADPL/DL/EPC/01 

1750MW DEMWE LOWER HEP, ARUNACHAL PRADESH, INDIA 

Pg. 

No. 

Cl. 

Ref. 

Amendment No-1 

Existing Provision in Bid 

Document 

-- --- Stage-I (Techno-commercial) Bid 

Receipt Date & Time: 

Upto 03.08.2010 by 

11:00Hrs.(IST) 

Stage-I (Techno-commercial) Bid 

Opening Date & Time: 

03.08.2010 by 11:30Hrs.(IST) 

2, 

5 

2.0, 

3.4 

1 

Read as/ Remarks 

Stage-I (Techno-commercial) 

Bid Receipt Date & Time: 

Upto 25.08.2010 by 

11:00Hrs.(IST) 

Stage-I (Techno-commercial) 

Bid Opening Date & Time: 

25.08.2010 by 11:30Hrs.(IST) 

Dynamic braking system Dynamic braking system is 

deleted. 

2 Sr. 4b 50 MVA, 11/420 kV, 50 Hz, threephase, 

YNd11, OFWF cooled 

Generator Step-up Transformers 

having off-load tap changers, 

complete with HV terminations for 

connection to SF6 gas bus duct, 

bushing CT's, neutral and LV 

bushings, online oil gas analyzer, 

all necessary fittings, auxiliary 

equipment and accessories as 

per of PTS no 904/ EMTD/ TS-21. 

44 4.2.1 Stream sealing. Music Note Type 

Taflon Cladded Rubber Seal IS: 

11855 

Shall be read as “50 MVA, 

11/420 kV, 50 Hz, threephase, 

YNd11, OFWF cooled 

Generator Step-up 

Transformers having off-load 

tap changers, complete with 

HV terminations for connection 

to SF6 gas bus duct, bushing 

CT's, neutral and LV bushings, 

all necessary fittings, auxiliary 

equipment and accessories as 

per of PTS no 904/ EMTD/ TS- 

21”. 

(Online gas analyzer is 

deleted.) 

Down Stream sealing. Music 

Note Type Taflon Cladded 

Rubber Seal IS: 11855 

89 8.2.1 ----- Shall be added after Gate 

lowering speed: 

Emergency Closing 

Maximum: 6.0m/min (The 

closure speed shall be 

controlled within 0.5-1.0 m/min 

at 50-100cm above Sill.) 

178 13 LIFTING BEAM FOR BREAST 

WALL SPILLWAY STOPLOG / 

OPEN SPILLWAY STOPLOG/ 

INTAKE TRASH RACKS, 

INTAKE STOPLOGS AND 

DRAFT TUBE GATE 

LIFTING BEAM FOR BREAST 

WALL SPILLWAY STOPLOG / 

OPEN SPILLWAY STOPLOG/ 

INTAKE TRASH RACKS AND 

INTAKE STOPLOGS 

178 13.1 Intake Stoplogs gate Intake Stoplogs 

178 13.1 Draft Tube gates in the 

powerhouse 

Deleted


Volume/ 

Section 

Vol. IV.4 Part-A, 

Doc No: 904/ 

EMTD/ TS-00 

Vol. IV.4 Part-A, 

Doc.No: 904/ 

EMTD/ TS-11 

Vol. IV.4, Part-A 

Doc. No: 904/ 

EMTD/ TS-11 

Vol. IV.4 Part-A 

Doc No: 904/ 

EMTD/TS-53 


Doc No. 904/ 

Pg. 

No. 

Cl. 

Ref. 


Document 

178 13.1 The first two lifting beams will be 

attached to the hook of the gantry 

crane at the dam site and second 

and third lifting beams will be 

attached to the hook of the gantry 

crane at the dam site and the fifth 

lifting beam will be attached to the 

gantry crane in the transformer 

cavern of powerhouse 

182 14.1 Three number gantry crane of 

Class-2 (IS: 807), out door 

travelling type is to be provided 

on the top of Draft pier for the 

operation of Draft Tube Gates-15 

sets 

182 14.1 The gantry crane will be used for 

the operation of all the four items 

with the help of respective 

individual lifting beams. The 

gantry’s upstream hoist shall be 

so designed to be on a moving 

trolley, to facilitate the movement 

of the hook upstream or 

downstream, so that it is possible 

to position the hook of the crane 

at the centre of gravity of the 

equipment it is to operate. The 

mechanism must be provided to 

lock the crane hoist trolley at 

these locations. When not in use 

the gantry will be parked at the 

extreme end of the dam on left 

side. 

194 14.4.20 Design data: Gantry Crane (Draft 

Tube Gate) 

8 1.5, 1.6 Silt/ sediment content & 

petrographic analysis and 

transport limitation 

6 1.3.1. 

xix 

“Maximum cooling water inlet 

temperature – 25 deg. C” 

20 1.4.7 “Pipes for coolers shall be made 

of 70:30 Cupro-Nickel alloy.” 

3 1.1.1 Control, monitoring and related 

items and services 

iii) Local control cubicles for air 

handling units, water cooled 

chiller units, circulation pumps, 

exhaust fans etc. 

2 


This para stands deleted. 

This para stands deleted. 

The gantry crane will be used 

for the operation of all the 

three items with the help of 

respective individual lifting 

beams. The gantry’s upstream 

hoist shall be so designed to 

be on a moving trolley, to 

facilitate the movement of the 

hook upstream or 

downstream, so that it is 

possible to position the hook of 

the crane at the centre of 

gravity of the equipment it is to 

operate. The mechanism must 

be provided to lock the crane 

hoist trolley at these locations. 

When not in use the gantry will 

be parked at the extreme end 

of the dam on left side. 

This Para stand deleted. 

Enclosed as Annexure B and 

Annexure C 

“Maximum cooling water inlet 

temperature – 23 deg. C” 

“Pipes for coolers shall be 

made of 70:30 or 90:10 Cupro- 

Nickel alloy.” 

“water cooled chiller units, 

Circulation pumps etc.” is 

deleted. 

6 1.4.2 “Max. water temperature of 25 o C” “Max. water temperature of 

23 o C”


Volume/ 

Section 

EMTD/ TS-21 


Doc No. 904/ 

EMTD/ TS-29 

Vol.IV.4, Part-B 

Doc No. 904/ 

EMTD/ MSP-10 

Vol.IV.4, Part-B 

Doc No. EMTD/ 

MSP-10 

Vol. IV.5 

Drawing no. 904 

EMTD SLD-30 

101 (MV 

Switchgear 

Schematic) 

Pg. 

No. 

Cl. 

Ref. 

5 1.4.1 

Sr. No 

13, 20 

& 27 

1 Sl. No 

3 

1 Sl. No 

3 


Document 

“Material of bus bar : Aluminum / 

Copper” 

Mandatory spares for 342MW 

turbine 

“Cheek Plates for top cover/ 

bottom ring/ Pivot ring machine” 

Mandatory spares for 40MW 

turbine 


bottom ring/ Pivot ring machine” 

-- “Material of bus bar : Aluminum / 

Copper” 

Encls.: 

Annexure B: Silt/ Sediment Content & Petrographic Analysis 

Annexure C: Transport Limitation/ Route Survey 

3 


“Material of bus bar: Copper”. 

(the word “Aluminum” is 

deleted) 


bottom ring”. 

(Pivot ring machine stands 

deleted.) 


bottom ring”. 

(Pivot ring machine stands 

deleted.) 

“Material of bus bar: Copper”. 

(the word “Aluminum” is 

deleted)

WILH LOESCH INDIA PVT. LTD. 

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ROUTE SURVEY REPORT 

LOWER DEMWE & UPPER DEMWE HYDRO ELECTRIC POWER PROJECT, TEZU DISTRICT, 

ARUNACHAL PRADESH 

This Route Survey was conducted by Wilh. Loesch India mainly with the intension to investigate the feasibility for transportation of 

the project cargo from Dibrugarh, Assam to the Lower & Upper Demwe Project in Arunachal Pradesh. 

The entire route was travelled by road and an extensive route survey was carried out on current road condition. We have checked 

National Highways, State Highways, Hilly Road sections, Land Slide zones, Road condition, Bridge condition, Vertical clearance of 

over head structures, Electrical Lines, Availability of turning radius etc. 

The survey was carried out between 7 th & 8 th May , 2009. 

The following dimensions and weight of the cargo were taken into consideration during this route survey: 

PARAMETERS: 

LENGTH - 7 M WEIGHT - 125 TONS 

WIDTH - 7 M 

HEIGHT - 6 M 

After having detailed analysis it has been observed that the following said route is feasible for transportation by hydraulic trailer 

combination. 

ROUTE: 

The following road approaches the Lower Demwe Power House site- 

Dibrugarh – Tinsukia – Dumduma – Rupai – Kakopather – Dirak – Namsai – Chowkham – medo – Wakro – Parsuramkund – 

Demwe Lower Power House 

The following road approaches the Upper Demwe Power House site- 

Parsuramkund – Tohangam – Udayl Pass – Lalpani – Teading – Paya – Mompani – Power House Site

Comments: 

Based on the feasibility route survey our observation & conclusion are as follows: 

Lower Demwe Project: 

� The Road from Dibrugarh to Rupai (Total distance 80 KM) we are travelling on NH – 37. The road is in good condition having 

carriage width 6.5 M & clear width of road is 7.5 M. 

� From Rupai to Parshuramkund (Total distance 133 KM) we are travelling on NH-52. The road is in good condition. At many 

places road is narrow having carriage width – 3.5 M but clear width of the road is 7 M & the entire NH-52 is under planning 

for widening for which road widening is under construction. 

� It was observed that up to DEMWE LOWER (Parsuramkund) all bridges are RCC (70 R) with clear width of 7.5 M or more 

which are capable to take 125 MT cargo weight plus vehicle weight. 

� It was observed that at Tinsukia (52 KM) we have to pass under the Overhead Bridge for which height restriction is 6 M from 

ground level. 

Conclusion: 

From logistics point of view we conclude that cargo upto 125 MT (excluding Trailer) in weight, 12 M in length , 6 M in width & 6 M in 

height including vehicle on 10 axles hydraulic trailer can move safely & smoothly up to Lower Demwe Project Site. 

Upper Demwe Project: 

� The road stretch between Lower Demwe & Upper Demwe is around 70 KM but having plenty of restriction all along the 

route. The present road condition is very bad. The entire route is in forest hilly region having very narrow road, short turning 

radius, steep up & down gradient. Most of the bridges are steel constructed & very weak. Further one bridge on Tiding river 

(40 KM) which is hanging suspension bridge with restriction of only 9 MT weight. (Details are attached with distance chart 

report.) 

Conclusion: 

We feel that as on date it is not possible to carry any cargo which is more than 3 M wide & weight 9 MT including vehicle. 

After having detailed analysis of this route , we strongly recommend to explore possibility of using barge between Lower Demwe & 

Upper Demwe, once the dam at Lower Demwe is filled, so that heavy equipments like runner, transformer & ODC cargo can safely & 

timely mobilize up to the Upper Demwe Project Site.


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FEASIBILITY REPORT OF ROUTE SURVEY FOR LOWER DEMWE PROJECT, ARUNACHAL PRADESH FROM DIBRUGARH,ASSAM 

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KM LOCATION STRUCTURE DETAILS REMARKS 

00 DIBRUGARH BYPASS Natiinal Highway No. 37 Survey started from Dibrugarh 

Road Width - 8 m, Road shoulder - 1 m Electric wires to be lifted for more height 

clearance 

Overhead Electric wires at 5.5 m height 

4.1 Dibrugarh bypass Road Carriage width -7 m, shoulder - 1.5 m 

6.5 Chaulkhua 

PHOTO AFFIXED- 00 KM PHOTO AFFIXED- 4.1 KM


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10.6 Lahoal Sign board at 6.5 m height Railway Station 

19.5 Dikom Railway Station 

30 Chabua Road Width - 6.5 m, Road shoulder - 1 m Railway Station 

39 Panitola Railway Station 

PHOTO AFFIXED- 10.6 KM PHOTO AFFIXED- 30 KM


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45 Tinsukia Bypass Overhead Electric wires at 5.5 m height 

48 Tinsukia Road Width - 7 m Railway Station 

50 Tinsukia Town Road Junction Turn Right on NH-37, Cross at night 

PHOTO AFFIXED- 45 KM PHOTO AFFIXED- 50 KM


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51 Tinsukia Market Area Road Junction Turn Right on NH-37 

52 Road under Bridge Height from ground level - 6 m 

Road width - 7 m 



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59 Makum Road Width - 6.5 m, Road shoulder - 1 m Railway Station 

67 Sign Board Height from ground level - 6.2 m 

PHOTO AFFIXED-59 KM PHOTO AFFIXED- 67 KM


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69 Barahapjan Road Width - 7 m 


74 Hausara 

PHOTO AFFIXED- 69 KM


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76 Dumduma Bridge 3 span x 27 m & 2 span x 7 m, RCC girder 70 R Bridge 

Carriage width - 7.3 m 

Height of side railing - 1.2 m 

76 Dumduma Town Railway Station 

PHOTO AFFIXED- 76 PHOTO AFFIXED- 76


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80 Rupai Road Junction 

Turn right & cross non- electric Width can be adjusted up to 6.5 m 

Railway Gate - Width - 6 m Follow NH-52 



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81 Bridge 3 span x 4.5 m , RCC Slab 70 R Bridge 

Road Width - 7.3 m 

81 NH-52 Road Carriage width -3.5 m, Road Widening is under construction 

Road Clear width - 7 to 7.5 m 



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92 Kakopather Road Junction Turn Left 




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95 Dangri Nallha Bridge 1 span x 35.7 m, RCC T-beam 70 R Bridge 

Road width - 7.4 m, Clear width - 10 m 





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97.50 Bridge 3 span x 10 m , RCC Slab 70 R Bridge 

Road Width - 11 m 

99 Dirakcharli Bridge 1 span x 34 m, 70 R Bridge 




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112 Dirak Narrow Road Arunachal Pradesh Starts here 

Road width - 3.5 m, Clear width - 6.5 m to 7 m Assam state ends 

113 Bridge 1 span x 34 m, RCC T-beam 70 R Bridge 




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\ 

113.5 Dirak Gate Police & commercial check post Arunachal Pradesh entry 

Gate Width - 6.6 m 

114 Mahadevpur Road width - 5.5 m + 1 m shoulder 



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116 Bridge 6 span x 9 m , RCC slab 70 R Bridge 

Road width - 7.5m 

119 Noadhing Bridge 2 span x 25 m 

13 span x 47 m, RCC T- Beam 70 R Bridge 




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124 Namsai Bypass Forest Check post 

127 Jenghthu Bridge 1 span x 50 m, RCC T-beam 70 R Bridge 




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127.5 Bridge 2 span x 10 m, RCC slab 70 R Bridge 

Road width - 7.5 m, Side Railing - 1.2 m 

128 Bridge 2 span x 10 m, RCC slab 70 R Bridge 




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138 Road (NH_52) Carriage width - 5.5 m,Clear Width - 7 m 

144.5 Tenga Pani Bridge 2 span x 36 m, RCC T-beam 70 R Bridge 




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153 Teang Bridge 2 span x 15 m 70 R Bridge 

1 span x 41 m, RCC T- Beam 

153.5 Chowkham Road Junction Turn Right on NH-52 

Straight to Tezu - 30 km 

For Tezu cross river by Ferry boat 



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155 Gunanagar 

Narrow Road, Road width 3.5 m ,clear width - 

7 m 


167 Marua Bridge 

171 Medo 

1 span x 70 m, RCC T-beam 


70 R Bridge 



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184 Road (NH-52) Narrow Road 

Road width - 3.5 m, Clear width 7.50 m 

187 Kamlang 



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191.5 Kamlang Bridge 1 span x 30 m, 70 R Bridge 

1 span x 65 m, RCC T-beam After this bridge up gradient in hilly region 

starts 

Road width - 7.5 m 

193 Bridge 1 span x 60 m, RCC T-beam 70 R Bridge 

Carriage width - 7.5 m 

195 Wakro 



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196 Wakro Bridge 1 span x 65 m, RCC T-beam 70 R Bridge 


198 Kanjang Bridge 1 span x 67 m, RCC T-beam 70 R Bridge 


208 Lai Bridge 4 span x 48m, RCC T-beam 70 R Bridge 




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212 Parsuram kund 

Lohit River Bridge Double cantilever bridge 70 R Bridge 

2 span x 34m, 3 span x 102 m 




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212 Lohit River 



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213 Road Junction Turn right to Demwe Power House site Narrow Road around 1.5 km 

Investigation under progress for Power House 

location 


UPPER DEMWE PROJECT


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FEASIBILITY REPORT OF ROUTE SURVEY FOR UPPER DEMWE PROJECT, ARUNACHAL PRADESH 

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0 PARASURAM KUND Hilly road with up gradient Survey started from Lower Demwe Power 

House on NH-52 after crossing Lohit 

Road width - 3.5 m + 1 m shoulder River Bridge 

1 Steel Baily Bridge 1 span x 36 m 

Road Carriage - 3.5 m, Side railing height - 

1.2 m Class - 24, Weak Bridge 

1 Hilly Road Narrow Road 



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1.3 Sharp U-Bend 10 m radius Turn on down gradient 

1.8 Sharp U-Bend 7 m radius Turn on up gradient 

PHOTO AFFIXED-1.3 KM PHOTO AFFIXED- 1.8 KM


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2.3 Narrow Road Road Width - 4 m One side rock mountain 

3 Hilly road 

4.2 Sharp U-Turn 9 m radius Road width 3.5m on up-gradient 

PHOTO AFFIXED-3 KM PHOTO AFFIXED- 4.2 KM


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4.3 Hilly Road Road Width - 4m Narrow Road 

8 Hilly Road Road Width - 4m Narrow Road 

10 Hume Pipe Causway Short turn, Road Width - 3.5 m 

11 Narrow Road Road Width - 3.5 m 

PHOTO AFFIXED-4.3 KM PHOTO AFFIXED- 10 KM


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12.5 Short Turn Narrow Road, Width - 2.7 m 

15.4 Tohangam Hawa Camp Road Junction Turn right to Hayulian on TB road,NH-52 

ends, Straight to Tezu 

0 Survey started from Tohangam/ Hawa camp to Upper Demwe Project at Mompani on Hauliang Road; from here total area is Hilly 

Region with steep up & down gradient with sharp U & S- Turns & Narrow Road. 

1 U-Bend Road width - 4.5m 



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1.4 Narrow Road Road Carriage - 3 m, Road clear width -4 m Road in bad condition 

1.5 Bridge 1 span x 12 m, width - 4.2 m 24 R bridge 

RCC slab on steel girder 



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RCC slab on steel girder At exit short turn with up- gradient 


RCC slab on steel girder 



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2.5 Both side rock 50 m stretch with clear width - 5 m 

2.9 Bad Road Road widening work under construction 



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3.6 Short U-Turn Radius - 5 m 

Road Carriage - 3.5 m, Road clear width - 

Up gradient 

8.5 Road 

4.7 m 



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10.4 Road Road Carriage - 3 m, Road clear width -4 m 

12.5 Udayk Pass Both side rock mountain 

Road Carriage - 3.2 m, Road clear width -5.2 m 

PHOTO AFFIXED-10.4 KM PHOTO AFFIXED-12 .5 KM


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13.2 Short Turn 

15.8 Short Turn 



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17.8 Bridge on short turn 1 span x 6 m, RCC slab on steel girder 24 R bridge 

18.6 Lalpani S- curve Bad road condition 



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19.1 Short Turn Radius - 5.5 m, Road width - 3.5 m very short turn on down gradient 

24 Temple Road width - 3.5m 



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29 Bad Road Road width - 3m, Road clear width - 4 m 

31 Salgam 

35 Bridge 1 span x 10 m, width - 3.7 m RCC slab on steel girder 

36.2 Bridge 1 span x 10 m, width - 3.7 m RCC slab on steel girder 



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36.6 Bridge 1 span x 10 m, width - 3.7 m RCC slab on steel girder 

38 Teading 

38.5 Arrow bridge 1 span x 74 m, Width - 7.5 m, Height - 6.2 m Box type steel bridge, 70 R bridge 

39 Bad Road Road width - 3.5m Narrow Road 



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40 Tidding River Bridge Clear Width - 3.7m, Road Width - 3.2 m Capacity - 9 MT 

Length - 120 m , Height - 5 m Suspension bridge with wooden surface base 



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40.5 Narrow Road Width - 3 m 

40.6 Short U-Turn Radius - 4 m 



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Narrow Road Bad road condition 

43.8 Bridge 1 span x 6 m, width - 4 m 

RCC slab on 



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45.5 Paya 

48.5 Payapani Bridge 1 span x 24.5 m, clear width - 3.6 m Steel Girder Baily bridge on short turn 

(New Bridge under construction) 



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51.7 Mompani Camp 

52.5 Dam Axis 

PHOTO AFFIXED-52.5 KM

BID DOCUMENT NO. ADPL/DL/EPC/01 1750MW DEMWE LOWER ...

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