nepal electricity authority electricity authority ... supply,installation and commissioning of...

NEPAL ELECTRICITY AUTHORITY

(An Undertaking of Government of Nepal)

Project Management Directorate

SASEC: Power System Expansion Project

KALIGANDAKI TRANSMISSION CORRIDOR PROJECT

BIDDING DOCUMENT

FOR

Procurement of Plant for Kusma – New Butwal 220 kV Transmission Line

(Design, Supply and Install)

Single-Stage, Two-Envelope

Bidding Procedure

Issued on:

Invitation for Bids No.: ICB-PMD-KGTCP–072/73-04

ICB No.: ICB-PMD-KGTCP-072/73-04

Employer: Nepal Electricity Authority

Country: Nepal

ADDENDUM-II

August 2016

Kaligandaki Transmission Corridor Project

Project Management Directorate

Satungal – Bauthali Chowk Marga,

Chandragiri Municipality, Matatirtha, Kathmandu, Nepal

Telephone: + 977-1- 5164099,5164091

Facsimile number: +977-1-5164091

Electronic mail address: [email protected] Telephone: +977-1-5164091, 5164099 Fax: +977-1-5164091

S.

No.

Clause of Reference for

the required

Clarification

Bidder's Request NEA Response

110

1. Type of Towers (Cl.

1.2.1 & Cl. 1.3.3, Section

IV, Volume II and Price

Schedules)

In Cl. 1.2.1, Section IV, Volume II, towers types have been specified. In this tower type DDE has

shown as dead end tower, whereas in Cl. 1.3.3, in table spans for all tower types have been specified. In

this there is no mention of Tower Type DDE. Instead Tower Type DDS has been shown. And also in

Price Schedule Tower Type DD Special has been mentioned. We understand Tower Type DDS /

Tower Type DDE / Tower Type DD Special is same

Pl. refer Addendum-II.

111Volume – 2 of Tender,

Section V B), Clause 2.1.2

In the case of composite core conductors, the tests specified under Clause 2.1.1 shall be carried out

before stranding on as manufactured samples.

Please clarify, does the clause refer to that "type test certificates has to be produced before the

manufacturing of conductor for supply.

Yes, the type tests certificates for

the offered size shall have to be

submitted along with the bid

Must have manufactured, tested and supplied at least 1000 km of HTLS conductor of the same

technology as that being offered in the bid as a main supplier over last five (5) years period as on date

of bid submission and 15% of the supplied quantity should have been in satisfactory operation in the

field for at least one year as on originally scheduled date of bid opening.

Please amend above as, Manufactured and tested at least 1000 Kms Cumulative supply of HTLS

technology product by main supplier over last 5 years period as on bid submission and 15% of supplied

quantity should have been in satisfactory operation in the field for at least one year as on originally

scheduled date of bid opening.

Manufacturer must possess skill base and personnel to assist in the field installation of the HTLS

conductors. The manufacturer complies with the specific handling requirements of the HTLS

conductors technology offered as specified in the standards and technical specifications.

Please Amend above as, Manufacturer must organize skill base personnel thru technology partner for

field installation of HTLS conductor.

Volume – 1 of Tender,

Section 3, Table 2.5 Item

No. 2 iii)


Section 3, Table 2.5 Item

No. 2 v)


PROJECT MANAGEMENT DIRECTORATE

KALIGANDAKI TRANSMISSION CORRIDOR PROJECT

ICB-PMD-KGTCP-072/073-04:Design, Supply,Installation and Commissioning of Kusma-New Butwal220 kV Transmission Line

Responses to Queries

112

Yes, the manufacturer must have

manufactured and tested at least

1000 kms cumulative supply of

HTLS technology products.

Yes your understanding is correct113

1 of 12

When evaluating individual bids received, differential price evaluation for the HTLS conductors

offered by the bidders shall be carried out @US$ 2,962.00 per kW for the average ohmic losses

calculated as follows:

The best parameter of loss (lowest ohmic loss for conductor) corresponding to lowest AC resistance

quoted among bidders by any technically responsive and qualified bidder shall be taken as basis and

that quoted by the particular bidder shall be used to arrive at differential price to be applied for each

bid.

Average Ohmic loss (kW) = Loss Load Factor X Line Length x No. of phasesx No. of subconductors X

(Continuous operating current under normal condition)2 X AC Resistance corresponding to continuous

operating current.

For 1062kmconductor length, loss load factor = 0.325, continuous operating current of 1200 Amp;

Average Ohmic loss (kW) = 0.325 x 1062 x (1200)2 x Rac/1000

= 497,016 X Rac

Where Rac is the AC resistance per km guaranteed by the bidder at temperature corresponding to the

continuous operating current of 1200A under normal condition.

We understand, if a technically responsive bidder offers HTLS conductor with lowest average ohmic

losses & evaluated to be most competitive bidder. And while testing, it is observed that average ohmic

losses of offered conductor are higher than the guaranteed value, then the amount of such loss in excess

of the guaranteed value shall be calculated as two times multiplied by loss value in excess of the

guaranteed values & maximum deduction in such case will be 10% of the contract price. Please

confirm if our understanding is correct.

115


Section 3, Clause 1.2.6 &


Section VB, Clause 1.10.1

While calculating average ohmic losses different “Continuous operating current” has been considered,

please clarify.

Please refer Amendment in the

Addendum-II

Ultimate tensile Strength is given for Earth wire, we understand that this UTS is for OPGW only.

Please confirm our understanding is correct.

Please provide the datasheet for OPGW including details of Diameter and Material of Outer Layer of

OPGW.


Section 3, Clause 1.2.6 & 1.

Liquidated Damages for

Functional Guarantee (Cl.

No. 4.4, Appendix-8, Page 9-

17)

Volume-II, Section IX

OPGW Specifications,

Appendix A, Table A-1,

Page 2 of 2,

Details of Earthwire is given for

reference purpose. Bidder has to

design the OPGW based on the

provision of technical

specifications which inter alia

include the Sag Tension limits

given in Appendix-A to Section-

IX.

Yes, your understanding is correct.

Please also refer Amendment in

the Addendum-II

114

116

2 of 12

117

Volume-I, Section 6

Employer’s Requirements,

Page No. 6-22, clause 8.0

Equipment, Sr.no 5

“Bender for HTLS conductor”. We find the quantity is missing and request you to provide the same. Quantity is "2"

118

Volume-II, Section-VIII

Hardware Fittings and

Conductor & Earth wire

Accessories, Page No. 7

Clause 1.20

Balancing Weight, it is given that a counter-weight of 200Kg is required for Pilot String. However,

reference drawing for Pilot String is not given in the specification. Kindly clarify the requirement of

counter-weights or provide the reference drawing for Pilot String.


119Drawings, Loading trees

for tower designThe loading trees & details of design for Tower type - DDS are not given in specification. Pl. refer Addendum-II.

As per BOQ, it is mentioned that HTLS type Conductor, 24 fibre OPGW & 7/3.35 GS Earthwire

is used where as the calculated sag & Tension calculation is for ACSR Zebra & EW.

Please Confirm the Sag & Tension, Loading trees/calculation to be used for tower design.

121

Volume-II, Section-IV ,

Page No.4 , clause no.

1.4.6

"For computing the live metal clearances the dimensions of single suspension, double

suspension, single suspension pilot, single tension & double tension strings shall be taken as

given in enclosed drawings". In drawings only few dimensions are mentioned. Please furnish

total length (max. & min.) of Hardware fittings including insulators

Please refer Addendum-II

122Volurne-ll, Section-IV, Page

No.5, clause no. 1.5.1

"Employer has calculated the ultimate external loadings at conductor and earth wire points

and are enclosed along with the specification. The contractor shall develop the tower designs

based on the loadings given by the employer only". Only max.angle of deviation is shown in

loading trees. As per Volume-Il, Section IV, page no. 1, clause no. 1.2.1, tower has to be designed

for minimum and maximum deviation, also DB & DC to be used as section tower with 0 degree

deviation. Please furnish loading tree for all deviation limit specified in spectficarton.

Bidders shall design as per the

provisions of the Bidding

Document.

123Volume-II. Section-XI,

Drawing,Loading tree for DD special tower was not enclosed. Please provide the same. Pl. refer Addendum-II.

124 Volume-III, page 16 of 34,

Schedule-3

Design services ,"Type DA, DB/DBE, DC/DCE, DO/DOE and special towers" was found,

whether DB & DC type tower has to be designed for dead end condition. Please clarify.Pl. refer Addendum-II.

120Vol. III, Schedule 2, Item

No.4. 7 (iv) & (v)

Tower is to be designed as per the

Sag & Tension, Loading trees

attached with the documents.

3 of 12

125

Volume-II, Section-IV,

Page No.2, clause no.

1.2.3.3

The towers shall be designed for providing unequal leg extensions with maximum difference

between the shortest and the longest leg of 3M for DA tower and 6M for DB, DC & DD towers.".

Please clarify how many levels of bench are allowed per tower and please furnish combinations

for leg extension per tower.

The tower has to be designed

for all possible leg extension

combinations as indicated in the

leg extension drawing. Pl. refer

amendment for drawing.

126Volume II Section-IV Page

No. 31, clause no. 2.6.1.2,

"The reactions on the footings shall be composed of the following type of loads for which these

shall be required to be checked:

a) Max. Tension or uplift along the leg slope.

b) Max. Compression or down-thrust along the leg slope.

c) Max. Horizontal shear or side thrust."

Whether foundation has to be designed for max. Uplift/down thrust case with corresponding

side thrust and checked for max.Side thrust case with its corresponding uplift/down thrust

forces. Please clarify

Bidder has to follow the

provision of the technical

specifications.

127Volume-III, page 31 of 34,

Schedule-4 Please specify with which extension tower has to be tested.

Pl. refer clause 1.14.1 of

Volume-II, Section IV.

"A Galvanized tower of each

type complete with 9 M

extension shall be subjected to

design and destruction tests … "

128Volume-I, Section 2, BDS,

ITB 21.1

It is mentioned that Bid securityshall be issued by a bank using the form included in bidding

form. If Security BG is It is mentioned that Bid securityshall be issued by a bank using the form

included in bidding form. If Security BG is issued by a bank outisde Nepal is it necessary to

counter guaranteed by any registered bank in Nepal.

No, it is not necessary to counter

guarantee the Bid Security issued

by a foreign bank by any bank in

Nepal.

129

Volume I, 2. Terms &

Procedures of Payment

(Appendix-1, Section-9)

a. The local currency payment will be made directly in contractor’s bank account by ADB or the same

will be paid by NEA. Please Confirm.

b. We understand that foreign currency payment of Advance amount, payment against completion

certificate and operational certificate will also be paid through Letter of Credit, in line with the foreign

currency payment procedure given in Appendix-1. Please confirm our understanding.

Local Currency, Advance amounts,

payment against completion

certificate and operational

certiricate shall be paid by

Withdrawal Application by the

ADB.

4 of 12

130For the standards adopted for the work of this project, shall we refer to Chinese standards? Or only

Indian standards/international standards shall be used?

Any internationally accepted

standards which ensure equal or

better performance than those

specified shall also be accepted,

subject to prior approval by the

Employer.

131The line route passes through forest. Will trees be cut off or retained to be crossed by the transmission

line?

Trees shall be cut where

clearances are not met in the ROW

as per the provision of the Bidding

Document

132The bidding document mentioned PLS-CADD and PLS-Tower software. Will other equivalent

software be accepted for the design work?No.

133The bidding document mentioned that the wind speed is 47m/s. What is the reference height and time

span for this wind speed?Please refer IS 802-1-1 (1995)

134 Please provide the single line diagram and weight of each steel tower.It is in the scope of the Bidder to

furnish them

135 Please provide the geological data along the line route.It is in the scope of the Bidder to

collect them

136

Clause no. 2.5 of Section 3

“Evaluation and

Qualification Criteria”, Item

No. 2 (ii)

It is mentioned that for HTLS Conductor the manufacturer Must have min 10 (ten) years manufacturing

experience of ACSR/ AAAC/ AACSR conductors of min 400 sq mm size in general and must have

manufacturing experience of HTLS conductors for the last 5 (five) years.

In context to above, please confirm what does ‘HTLS’ word means in above clause?


137Vol I, Section 3, EQC,

2.5, 2 (ii)

HTLS Conductor the manufacturer Must have min 10 (ten) years manufacturing experience of

ACSR/ AAAC/ AACSR conductors of min 400 sq mm size in general and must have

manufacturing experience of HTLS conductors for the last 5 (five) years. Offered technology

means, can we offer any HTLS conductor apart from ACCC, Invar Conductor? In context to

above, please confirm what does ‘HTLS’ word means in above clause?

Please Confirm.

HTLS conductor shall mean any

HTLS conductor in general

5 of 12

“For items under 1.1, the quantities of basic tower are given for each type of tower. Under this basic

tower, the stubs and basic tower body along with leg extensions quantities are given. We understand

that bidders are required to quote prices for basic tower with given description of “basic tower body” in

the schedule and for all the leg extensions, bidders are required to quote the price of those leg

extensions only, i.e. excluding price of basic tower.

Also, there will not be any quote against the description of “Basic Tower” as the same will be covered

against item description of Basic Tower body. Kindly Confirm

139

OPGW Technical

Specification

In the Sr. No. 18 of

Response to Pre-Bid Queries-

1, NEA’s has provided the

Addendum-1, for the OPGW

Technical Specification.

In the Addendum-1, only Chapter-01 is provided whereas the chapter-02 – Inspection and Testing

requirement is still missing.

Kindly request you to please provide the Chaper-02-Inspection and Testing requirement of bidding

document.

Any internationally accepted

standards which ensure equal or

better performance than those

specified shall also be accepted,

subject to prior approval by the

Employer.

In the above referred reference, NEA’s response is exemption of all taxes and duties except custom

duty @ 1%. Whereas as per Point No. (c) of Cl. No. 14 of SCC on Page No. 8-5, the custom duty will

be reimbursed by the Employer to the Contractor and the same is also confirmed in the Sr. No. 56 of

Response to Pre-bid Queries-1, Page 10 of 20.

From the above, we understand that, custom duty @ 1% will be reimbursed by Employer to the

contractor. Please Confirm.

141

Foundation Volumes (Sr.

No. 26 of Response to Pre-

bid Queries-1, Page 5 of 20)

However, in the Addendum, the provision for furnishing guaranteed foundation volumes along with

unit rates for excavation, concreting and reinforcement for each type of foundation of each type of

tower (In line with Cl. No. 2.9.1.2, Section-4, Vol.-II) in the Price Schedule is missing.

We kindly request you to please confirm that whether it is required to provide such details by the

contractor??

If require, then, we are once again requesting to amend the price schedule for providing such details in

the price schedule or provide the separate formats in which such details need to provide.

Pl. refer Addendum-II. The bidder

is required to enclose this

additional GTP in the envelope

marked "Price Bid"

142

Tree Cutting Scope (Sr. No.

13.a, 42, 61 & 82 of

Response to Pre-bid Queries-

1; Page 5, 8, 12 & 16 of 20)

We understand from the bidding document and subsequent response from NEA that, tree cutting is in

the scope of contractor in case of access route whereas tree cutting is in the scope of employer in case

of Transmission Line Route and ROW. Please confirm our above understanding.

Marking of the trees to be felled

under the ROW shall be in the

scope of the Contractor as per Vol

II, Section 3, 1.10.5.2. Tree cutting

shall be in the scope of the

employer

Same is in order.

Bidders are not required to quote

against the description of “Basic

Tower”

140

Custom Duty (Sr. No. 21.c

of Response to Pre-bid

Queries-1, Page 4 of 20)

Any custom duty paid by the

contractor as queried shall be

reimbursed by the Employer

138Sr. No. 7.a of Response to

Pre-Bid Queries-1

6 of 12

143

8. Sr. No. 76 of Response to

Pre-bid Queries-1; Page 15

of 20)

There is no response given in the above referred clarification. We are once again mentioning below the

clarification requested.

“While calculating average ohmic losses different “Continuous operating current” has been considered,

please clarify”. (Reference – Cl. 1.2.6, Section-3, Vol.-1 & Cl. 1.10.1, Section-VA, Vol.-II). Kindly

request you to please clarify the same.

Please refer Addendum II

2.(i) The offered conductor technology must have been in successful manufacturing and supply for at

least last ten years.

Offered technology means, can we offer any HTLS conductor apart from ACCC, Invar Conductor??

Please Confirm.

2.(iii) Must have manufactured, tested and supplied at least 1000 km of HTLS conductor of the same

technology as that being offered in the bid as a main supplier over last five (5) years period as on date

of bid submission and 15% of the supplied quantity should have been in satisfactory operation in the

field for at least one year as on originally scheduled date of bid opening.

Manufactured and tested at least 1000 kms Cumulative supply of HTLS technology product by main

supplier over last 5 ears period as on bid submission and 15% of supplied quantity should have been in

satisfactory operation in the field for at least one year as on originally scheduled date of bid opening.

Request to please amend accordingly.

It is mentioned as Material of LM-6 high strength Al. Alloy for stock-bridge Dampers.

If we propose Al. 356-T6 which has higher properties then LM-6 Al. alloy (as Per ASTM Standard)

Clamping Bolt shall be provide with Self Locking nuts.

In Case the design of Stockbridge Dampers does not have any nut in assemblies. Whether self-locking

nut required when we are going tightened into HTLS Conductor covered by Armor Rods

Damper clamp is required to be casted over the messenger cable and offer sufficient permanent grip.

We offer sufficient permanent grip, our clamp is not cast on the messenger cable, but crimped

146 Clause 2.4.3 (Page -15)Self Locking nuts shall be required

with Clamping Bolt only.

147As Per Tender Clause 2.4.6

(Page -16),

Bidders shall follow the provision

of technical specifications.


(Page -15)

Pl. refer to note given below the

Table-1 on Page-12 of Section-

VIII, Volume-II in this regard.

144

HTLS Conductor (Cl. No.

2.5, Section-3, Vol.-1, Page

3-9)

Please refer Amendment of

Addendum II

7 of 12

Galvanized Materials (i.e., Steel) Average Zinc Coating shall be equivalent to 600gm/sq.m

In Case Eyebolts are made of 17-4 Stainless Steel which is inherently resistant to corrosion. So Zinc

plating can be around 50-90gm/sq.m

The values in the specification were commonly requested for cast steel. They wanted a heavy layer of

Zinc to protect steel cast components.

150

Volume II Section III,

Clause no. 1.8 Clearance

from Ground, Building,

Trees etc.

Kindly clarify that Tree Enumeration, measurement of Girth at 1m height, height of trees, and name of

species is in the scope of contractor however cutting, stacking & Clearance/Compensation shall be

done by NEA themselves.

Your understanding is correct.

Please also refer to Volume II

Section III, Clause no. 1.10.5.2

151Volume II Section III,

Clause no. 1.10.4

It is mentioned that the Identification of land parcel no. from local authorities (Land revenue office and

Survey division) is in the scope of contractor and contractor has to hire Land Surveyors (Amin) for

identification land within the right of way and access to site.

Your understanding is correct.

Please also refer to Volume II

Section III, Clause no. 1.10.4.1

Manufacturer must possess skill base and personnel to assist in the field installation of the HTLS

conductors. The manufacturer complies with the specific handling requirements of the HTLS

conductors technology offered as specified in the standards and technical specifications.

We like to clarify whether Manufacturer must organize skill base personnel thru technology partner for

field installation of HTLS conductor.

148As Per Table – 1 (Details of

Materials) Page -12

152

Volume I, Section 3, EQC,

2.5 Subcontractors, 2 Core,

(iv).

Yes, your understanding is correct.

For Dead end Assembly EC Grade of Al purity not less than 99.50% Ours is 1100 Al alloy as per

ASTM Standard which is 99% Purity The Resistance of the clamp when compressed on conductor

shall not be more than 75% of the resistance of equivalent length of conductor whereas our Al alloy

electrical resistance conductivity is 57% (IACS).Note that Compression Dies used on Grade 1100 are

designed & calculated for Specific Tensile and Conductivity requirement which gives perfect

connection to Composite Core

Same is in order.


(Page - 21),Same is in order.

8 of 12

153

Volume I of III,

Section 3 – Evaluation and

Qualification Criteria,

Clause 2 – Qualification,

Sub Clause 2.5 –

Subcontractors,

Point 2 – Core of HTLS

Conductors

As per specification:

ii) Must have manufactured, tested and supplied core at least twice the bid quantity as a main supplier

over last five (5) years period as on date of bid submission and the same should have been in

satisfactory operation in the field for at least three (3) years as on originally scheduled date of bid

opening.

It should be amended as:

ii) Must have manufactured, tested and supplied core at least twice the bid quantity as a main supplier

over last Ten (10) years period as on date of bid submission and the same should have been in

satisfactory operation in the field for at least three (3) years as on originally scheduled date of bid

opening.

Remarks:

Contacted few manufacturers of INVAR/Composite core and their conductor manufacturer. The cycle

of producing core, supply of core, producing conductor, supply of conductor on site, erection of

conductorand final commissioning is very long. For 1062 km of HTLS conductor, core production and

supply generally takes 9 months, conductor production and supply takes about 9 months and

installation takes about 18 months. The whole process takes about 36 months before the operation of

the conductor begins. Hence, our request is to change core manufacturing, testing and supply

experience to Ten (10) years to provide necessary certificates to prove Three (3) years successful field

performance.

This is also in line with point i) which calls for minimum 10 (ten) years experience of core

manufacturer.


As per Specification for DDS (DD Special Tower) Normal Condition Max Weight Span is mentioned

1500 m. & Min is -1500 m and corresponding same Broken wire condition Maximum span is 900 m &

minimum is -900m

Kindly clarify that typical use of the tower shall be for longer individual spans. for higher weight span

+/- 1500 m under normal condition & +/- 900 m under broken wire conditions. Kindly confirm.

For double circuit towers the three phases shall be in vertical formation. The phase to phase spacing for

conductors shall be not less than 4.9 meters vertically for DA/DB/DC/DD towers and 8.30 meters

for DDS tower. However, the minimum horizontal separation between phase conductors of two circuits

shall be 8.4 meters.

Kindly clarify whether as we are having the option of DDS tower than the phase to phase spacing for

conductors for DD tower should also be 4.9 meter and for DDS (DD Special) tower should be 8.30

meter.

154

Volume II Section IV Tower

Foundation, Erection

Stringing & Commissioning

Pl. refer Addendum-II

9 of 12

155

Volume III of III,

Schedule No.4 – Installation

Services,

Point No. 14

Cost for supervision works to be imparted by the principal Core Manufacturer during the installation of

HTLS conductor at site

Engineer – 180 MDays

Supervisor – 180 MDays

Our recommendation is to consider 180 man days of Supervisor and Engineer per crew. In-case there

are multiple crews on the site then each crew will have its own Engineer and Supervisor team for

effective supervision.

Yes, your understanding is correct

156

Volume II

Section VIII


Conductor & Earthwire

Accessories

For rigid spacer and vibration damper the conductor is twin bundled, the conductor is twin bundled, we

like to get confirmation that the qty in BOQ which means that one rigid spacer with one vibration

damper

Query is not clear.

157

Volume II

Section VIII


Conductor & Earthwire

Accessories

Drawings

As per drawings attached arcing gap is 2,400 mm from the calculation on given data for insulator, it is

not possible to reach required 2,400 mm please confirm whether 2,400 mm is just for reference and

actual if less from calculation is also acceptable to NEA.


"Reference drawing for leg extension arrangement is enclosed in the Bid Document".

The Leg extension arrangement drawing was not enclosed in bid document. We request you to

please provide the drawing.

159Kindly furnish following

documents also:-The sketch of tower showing arrangement of leg extensions. Pl. refer Addendum-II.

160

In the Bid Security Bank Guarantee, it is said ..... For the execution of (name of contratct). .. Under

Invitation for Bids No. ICB-PMD-KGTCP-072/73-04("the IFB"), can we specify the name of contract as "

Design, Supply, Installation and Commissioning of Kusma-New Butwal 220kV Transmission Line."

Yes, you may.

161

In Bidding Document Volume I-Section 8, for article 14.5.2, Import License, it is said "The Employer will

assist the Contractor to obtain necessary permits for import of such equipment and material into Nepal.

Import license fees or any other charges shall be at the cost of Contractor." What is the cost rate for Import

license fees or any other charges?

All such fees if any shall be borne

by the Contractor. Please refer

www.ird.gov.np

158

In Volume-Il, Section IV ,

page no. 2 ,clause no.

1.2.3.1


10 of 12

Whether Q235 and Q345 steel according to Chinese standard (of which the yield strength are respectively

235 MPa and 345 MPa) can be used instead of E250 and E350 grade of steel in the invitation for bid, which

as shown in the table. According to experience, using Chinese standard steel Q235 and Q345 can completely

guarantee the quality and safety of steel tower and the tower weighs almost the same.

Invitation for bid Chinese standard

steel grade yield strength (MPa) steel grade yield strength (MPa)

E250 250 Q235 235

E350 350 Q345 345

163

Whether bored piles of 800 mm diameter can be used in the project. In the design of transmission lines in

China, bored piles of 800 mm diameter have been large-scale used, which can fully guarantee the

engineering quality and safety.

This shall be as per the provisions

of the Bidding Document

Whether the foundation of other forms can be used. For example, when the foundation is located in the

mountain but the slope is steep, using the anchor foundation makes the excavated volume too big, therefore

we suggest using the rock embedded foundation. When the foundation is located in the hilly area, using the

PAD foundation makes the excavated volume too big, therefore we suggest using the excavating pile

foundation.

165

Should we close the road when crossing national highways? Should we cut off the power when crossing

power line? Should we close the river when crossing navigable river? If necessary, who is responsible for

handling procedures, whether other measures need to be monitored?

The employer shall facilitate

during such instances.

164

162This shall be as per the provisions


This shall be as per the provisions


11 of 12

166Response to Pre bid queries

- 1, Sl No. 34

Sag at maximum temperature for HTLS conductor is mentioned as 9.75m in technical specification As

per your response it is confirmed to use this sag for fixing tower height for other bidders inquiry. In

contrast in tender document you have furnished sag tension calculation with sag of 10.36m at 80 deg

temperature. please confirm which Sag is to be considered .


167 Volume-II, Section-III,

Page No. 12, clause no.3.4.1

"CBIP Manual on transmission line towers, Chapter – 10 Foundations"

Please specify the publication no. 268 or 323 to be referred.

The latest publication to be

reffered. However, the provision of

technical specifications shall

prevail, in case, of any

descrepancy.

168

Custom Duty (Sr. No. 21.c

of Response to Pre-bid

Queries-1, Page 4 of 20)

In the above referred reference, NEA’s response is exemption of all taxes and duties except custom

duty @ 1%.

Whereas as per Point No. (c) of Cl. No. 14 of SCC on Page No. 8-5, the custom duty will be

reimbursed by the Employer to the Contractor and the same is also confirmed in the Sr. No. 56 of

Response to Pre-bid Queries-1, Page 10 of 20.

From the above, we understand that, custom duty @ 1% will be reimbursed by Employer to the

contractor.

Please Confirm.

Yes your understanding is correct

12 of 12

of 5

Amendment-II to Bidding Documents, Volume-I

Clause No. Existing Amendment

Volume-I,

Section-3, Clause

no. 1.2.6

1.2.6 Specific additional criteria

When evaluating individual bids received, differential price

evaluation for the HTLS conductors offered by the bidders shall

be carried out @US$ 2,962.00 per kWfor the average ohmic

losses calculated as follows:

The best parameter of loss (lowest ohmic loss for conductor)

corresponding to lowest AC resistance quoted among bidders

by any technically response ve and qualified bidder shall be

taken as basis and that quoted by the particular bidder shall be

used to arrive at differential price to be applied for each bid.

Average Ohmic loss (kW) = Loss Load Factor X Line Length x

No. of phasesx No. of subconductors X (Continuous operating

current under normal condition)2 X AC Resistance

corresponding to continuous operating current.

For 1062km conductor length, loss load factor = 0.325,

continuous operating current of 1200 Amp;

Average Ohmic loss (kW) = 0.325 x 1062 x (1200)2 x

Rac/1000

= 497,016 X Rac

Where Rac is the AC resistance per km guaranteed by the

bidder at temperature corresponding to the continuous operating

current of 1200A under normal condition.

1.2.6 Specific additional criteria

When evaluating individual bids received, differential price

evaluation for the HTLS conductors offered by the bidders shall

be carried out @US$ 2,962.00 per kWfor the average ohmic

losses calculated as follows:

The best parameter of loss (lowest ohmic loss for conductor)

corresponding to lowest AC resistance quoted among bidders by

any technically responsive and qualified bidder shall be taken as

basis and that quoted by the particular bidder shall be used to

arrive at differential price to be applied for each bid.

Average Ohmic loss (kW) = Loss Load Factor X Line Length x

No. of phasesx No. of subconductors X (Continuous operating

current under normal condition)2 X AC Resistance

corresponding to continuous operating current.

For 1062km conductor length, loss load factor = 0.325,

continuous operating current of 615 Amp;

Average Ohmic loss (kW) = 0.325 x 1062 x (615)2 x Rac/1000

= 130544.36X Rac

Where Rac is the AC resistance per km guaranteed by the bidder

at temperature corresponding to the continuous operating current

of 615A under normal condition.

Volume – I

Section 3,

Sub Clause 2.5:

Subcontractor

Point 2 – Core

HTLS Conductor

Page (3 of 9)

"Must have manufactured, tested and supplied core at least

twice the bid quantity as a main supplier over last five (5) years

period as on date of bid submission and the same should have

been in satisfactory operation in the field for at least three (3)

years as on originally scheduled date of bid opening”.

"Must have manufactured, tested and supplied core at least twice

the bid quantity as a main supplier over last ten (10) years period

as on date of bid submission and the same should have been in

satisfactory operation in the field for at least three (3) years as on

originally scheduled date of bid opening”.

of 5

Amendment-II to Bidding Documents, Volume-II


Volume II,

Section VA 1.4.1 Particulars Limiting value

Tension at every day condition

(32°C, no wind)

Not exceeding

25% of UTS of

proposed

conductor

Sag at designed maximum

temperature (corresponding to 1200

amperes and ambient conditions

specified at 1.2.1)

≤9.75 meters

Tension at following wind pressure:-

i) Tension at 32 deg C, full wind

(166.8kg/m2)

≤ 6892kg & not

exceeding 70% of

UTS of proposed

conductor

Particulars Limiting value

Tension at every day condition

(32°C, no wind)

Not exceeding

25% of UTS of

proposed

conductor

Sag at designed maximum

temperature (corresponding to 1200

amperes and ambient conditions

specified at 1.2.1)

≤10.36 meters

Tension at following wind pressure:-

i) Tension at 32 deg C, full wind

(166.8kg/m2)

≤ 6892kg & not

exceeding 70% of

UTS of proposed

conductor

Volume-II,

Section-IV,

Clause 1.1.3

The towers shall be of the following types:

A) Double Circuit towers (DA, DB, DC & DD/DDE)

B) Special towers.

The towers shall be of the following types:

A) Double Circuit towers (DA, DB, DC & DD/DDE)

B) Special towers (DDS)

of 5

Volume-II,

Section-IV,

Clause 1.2.1

The towers for 220 kV Lines are classified as given below:

The towers for 220 kV Lines are classified as given below: _________________________________________________

Type of Deviation Typical Use

Tower Limit

_________________________________________________

DDS 0 - 60 deg. a) Angle tower with tension insulator string used for very long spans.

b) Also to be used for uplift forces resulting from an uplift span up to 900m under broken wire condition.

c) Complete dead end. _______________________________________________

Note: The DDS tower shall also meet all the technical requirements specified for DD type tower, unless stated.

Volume-II,

Section-IV,

Clause 1.6.2

Conductor and Earthwire Configuration For double circuit towers the three phases shall be in vertical formation. The phase to phase spacing for conductors shall be not less than 4.9 meters vertically for DA/DB/DC towers and 8.30 meters for DD tower. However, the minimum horizontal separation between phase conductors of two circuits shall be 8.4 meters.

Conductor and Earthwire Configuration For double circuit towers, the three phases shall be in vertical formation. The phase to phase spacing for conductors shall be not less than 4.9 meters vertically for DA/DB/DC towers, 8.30 meters for DD tower and 11.80 meters for DDS tower. However, the minimum horizontal separation between phase conductors of two circuits shall be 8.4 meters.

Volume II,

Section IV, 3.1.1

The stringing equipment shall be of sufficient capacity to string simultaneously a bundle of TWIN ZEBRA Conductors.

The stringing equipment shall be of sufficient capacity to string simultaneously a bundle of TWIN HTLS Conductors.

Volume-II,

Drawings

Drawings

Insulator String Drawings

Drawings

Insulator String Drawings (Revised)

of 5

Volume II,

Section VA,

2.1.2

In the event of any discrepancy in the test report (i.e., any test

report not applicable due to any design /

material/manufacturing process change including substitution

of components or due to non compliance with the requirement

stipulated in the Technical Specification) the tests shall be

conducted by the Contractor at no extra cost to the Employer/

Employer/ Purchaser.

In the event of any discrepancy in the test report (i.e., any test

report not applicable due to any design / material/manufacturing

process change including substitution of components or due to

non compliance with the requirement stipulated in the Technical

Specification) the tests shall be conducted by the Contractor at

the cost quoted as per the BPS Schedule 4(d).

Volume II, GTP

Schedule 8, Page

4, S. No. 7.16

AC resistance at maximum continuous operating temperature

corresponding to specified maximum operating current (1000 A

under ambient condition enclosed as per Technical

Specification )

AC resistance at maximum continuous operating temperature

corresponding to specified maximum operating current (1200 A

under ambient condition enclosed as per Technical

Specification)

Volume II, GTP

Footer &

Schedule 8

“ TECHNICAL DATA SHEETS (VOLUME III)” &

TECHNICAL SPECIFICATION (VOL III)

“ TECHNICAL DATA SHEETS (VOLUME II)” & TECHNICAL

SPECIFICATION, EMPLOYER’S REQUIREMENT (VOL II)

of 5

Amendment-II to Bidding Documents, Volume-III


Volume III,

Schedule 4(a)

4.3 Tension Tower DC

b) Foundation for +1.5m, +3m, +4.5m +6m, +7.5m, +9m Extension

iii) Partially Submerged Foundation Nos. 2

v) Wet Black Cotton Nos. 3



iii) Partially Submerged Foundation Nos. 3


4.4 Tension Tower DD

a) Foundation for -4.5m, -3m, -1.5m, +/- 0m Extension



a) Foundation for -4.5m, -3m, -1.5m, +/- 0m Extension




vi) Dry Fissured Rock Nos. 6



vi) Dry Fissured Rock Nos. 5

Volume-III,

Price Schedule-3

Design Services Type DA, DB/DBE, DC/DCE, DD/DDE and special towers

Design Services Type DA, DB, DC, DD/DDE, DDS and special towers

Guaranteed Foundation Volumes / Rate Currency -

4.1 Suspension Tower DA

a) Foundation for -4.5m, -3m, -1.5m, +/- 0m

Extension

i) Dry Foundation

ii) Wet Foundation

iii) Partially Submerged Foundation

iv) Fully Submerged Foundation

v) Wet Black Cotton

vi) Dry Fissured Rock

vii) Wet Fissured Rock

viii) Submerged Fissured Rock

ix) Hard Rock

x) Sandy Soil Foundation

b) Foundation for +1.5m, +3m, +4.5m +6m,

+7.5m, +9m Extension

i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock


c) Foundation for +18m, +25m Extension

i) Dry Foundation

ii) Wet Foundation

Total Rate

Quoted Rein.Steel

(per MT)

Item DescriptionSl. No.

Volume / Weights Unit Rate

Conc

1:2:4

(cu.m.)

Conc

1:3:6

(cu.m.)

Rein.Steel

(MT)

Excavation

( per cu.m)

Conc 1:2:4

(per cu.m.)

Conc 1:3:6

(per cu.m.)

Excavation

(cu.m)



v) Wet Black Cotton




ix) Hard Rock


4.2 Tension Tower DB


Extension

i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock




i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock




Extension

i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock




i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock




Extension

i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock




i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock


c) Foundation for +18m, +25m Extension

i) Dry Foundation

ii) Wet Foundation



v) Wet Black Cotton




ix) Hard Rock


-4.5

-3.0

-1.5

±0

+1.5

+3.0 +3.0

+4.5

+6.0

+7.5

+9.0

BASIC BODY


TRANSMISSION LINE /SUBSTATION CONST. DEPARTMENT

TRANSMISSION AND SYSTEM OPERATION

KUSHMA-NEW BUTWAL 220 KV T/L PROJECT

PROJECT :

TOWER EXTENSIONS

TILTE :

POWERGRID CORPORATION OF INDIA LTD.CONSULTANT :

PREPARED BY :

CHECKED BY :

APPROVED BY :

SCALE : NOT TO SCALE

DRG. NO. - K-B/220KV/011

DATE :

BID PURPOSE ONLY

ASSM 5, 5A: SECURITY CONDITION (CONDBROKEN)

ASSM 2, 3, 4, 2A, 3A, 4A: SECURITYCONDITION (GW BROKEN)

NOTES:1. Wind Span 350 m (NC), 210 m (BWC)2. Weight Span 1500 m (NC), 900 m (BWC) Maximum -1500 m (NC), -900 m (BWC) Minimum3. All ultimate loads are in kg.4. Bracketed figures indicate Minimum Vertical Load/Uplift Loads5. Angle of Deviation = 60 °6. Wind Load (Full Wind) on Tower Body shall be considered extra in all above assumptions.7. S.W. (Self Weight) of Tower shall be considered Extra.8.Assm. 2A, 3A & 4A indicates Right Side GW Broken conditions.9. Assm. 5A indicates Right Side Conductors Broken condition.10. Insulator Strings Weight & Wind on Strings are included in above Load.

1880

445(-425)

4418(-2018)

9343

SW SW

SW

ASSM 1: RELIABLITY CONDITION(NORMAL)

2

7

7

7


17609

735(-715)

3613

LOAD TREES FOR TYPE- DDS

6363(-3963)

1

3

3

1

4

3613

1

3

3

1

4

735(-715)

17609

17609

17609

17609

17609

6363(-3963)

6363(-3963)

6363(-3963)

6363(-3963)

6363(-3963)

735(-715)

3613

735(-715)

735(-715)

3613 3613

4418(-2018)

9343

17609

6363(-3963)

17609

6363(-3963)

17609

6363(-3963)

17609

6363(-3963)

4418(-2018)

9343

1

3

3

1

4

4418(-2018)

9343

1

3

3

1

4

4418(-2018)

9343

1

3

3

1

4

17609

6363(-3963)

17609

6363(-3963)

17609

6363(-3963)

SHEET NO. 1 OF 4DRG. No.

ASSM 10, 10A: SAFETY CONDITION (CONDBROKEN)

ASSM 7, 8, 9, 7A, 8A, 9A: SAFETYCONDITION (GW BROKEN)

ASSM 6: SAFETY CONDITIONS (NORMAL)

SW

2826

9346

9

7

1

485

1042

SW

SW

LOAD TREES FOR TYPE- DDS

5652

13389

5

6

5

2

7

2

8

4

2

3

9

1622

971

2826

5

6

5

2

5652

13389

1622

971

5652

13389

5652

13389

13389

13389

13389

5652

5652

5652

9346

4

2

3

9

4

2

3

9

4

2

3

9

13389

13389

13389

5652

5652

5652

1622

971

7

2

8

1622

971

1622

971

7

2

8

2826

9346

5

6

5

2

2826

9346

5

6

5

2

2826

9346

5

6

5

2

4

2

3

9

4

2

3

9

4

2

3

9

13389

13389

13389

5652

5652

5652

NOTES:1. Wind Span 350 m (NC), 210 m (BWC)2. Weight Span 1500 m (NC), 900 m (BWC) Maximum -1500 m (NC), -900 m (BWC) Minimum3. All ultimate loads are in kg.4. Bracketed figures indicate Minimum Vertical Load/Uplift Loads5. Angle of Deviation = 60 °6. Wind Load (Full Wind) on Tower Body shall be considered extra in all above assumptions.7. S.W. (Self Weight) of Tower shall be considered Extra.8.Assm. 2A, 3A & 4A indicates Right Side GW Broken conditions.9. Assm. 5A indicates Right Side Conductors Broken condition.10. Insulator Strings Weight & Wind on Strings are included in above Load.



LOAD TREES FOR TYPE- DES

ASSM 15, 15A: DEAD END CONDITION(COND BROKEN)

NOTES:1. Wind Span 200 m (NC), 40 m (BWC)2. Weight Span 750 m (NC), 100 m (BWC) Maximum -750 m (NC), -60 m (BWC) Minimum3. All ultimate loads are in kg.4. Bracketed figures indicate Minimum Vertical Load/Uplift Loads5. Angle of Deviation = 15 °6. Wind Load (Full Wind) on Tower Body shall be considered extra in all above assumptions.7. S.W. (Self Weight) of Tower shall be considered Extra.8. Assm. 12A, 13A & 14A indicates Right Side GW Broken conditions.9. Assm. 15A indicates Right Side Conductors Broken condition.10. Insulator Strings Weight & Wind on Strings are included in above Load.

ASSM 12, 13, 14, 12A, 13A, 14A: DEAD ENDCONDITION (GW BROKEN)

SW SW

58(-19)

84

ASSM 11: DEAD END CONDITION (NORMAL)

SW

1166

3932(-1532)

5920

372(-352)

2

8

7

5

1

3

7

8

4

1824(705)

782

1824(705)

1824(705)

1824(705)

1824(705)

2

8

7

5

1166

372(-352)

3932(-1532)

1

3

7

8

4

3932(-1532)

1

3

7

8

4

3932(-1532)

3932(-1532)

3932(-1532)

1

3

7

8

4

1

3

7

8

4

1

3

7

8

4

3932(-1532)

1

3

7

8

4

3932(-1532)

1

3

7

8

4

3932(-1532)

1

3

7

8

4

3932(-1532)

1

3

7

8

4

2

8

7

5

1166

372(-352)

2

8

7

5

1166

372(-352)

372(-352)

2

8

7

5

1166

3932(-1532)

1

3

7

8

4

3932(-1532)

1

3

7

8

4

3932(-1532)

1

3

7

8

4

5920

5920

5920

5920

5920

5920

5920

5920

5920

782

782

5920

5920

5920

782

782



LOAD TREES FOR TYPE- DES

ASSM 20, 20A: DEAD END SAFETY CONDITION(COND BROKEN)

ASSM 17, 18, 19, 17A, 18A, 19A: DEAD ENDSAFETY CONDITION (GW BROKEN)

SW SW

270

4158

ASSM 16: DEAD END SAFETY CONDITIONS(NORMAL)

SW

8526

1463

4

1

3

5

4158

898

8

6

3

251

4158

4158

4158

8

6

3

898

251

8526

1463

4

1

3

5

8526

1463

4

1

3

5

1463

4

1

3

5

8526

1463

4

1

3

5

8526

1463

4

1

3

5

8526

8

6

3

898

251

1463

4

1

3

5

8526

1463

4

1

3

5

8526

1463

4

1

3

5

8526

8526

4

1

3

5

1463

8

6

3

898

251

1463

4

1

3

5

8526

1463

4

1

3

5

8526

1463

4

1

3

5

8526

898

8

6

3251

NOTES:1. Wind Span 200 m (NC), 40 m (BWC)2. Weight Span 750 m (NC), 100 m (BWC) Maximum -750 m (NC), -60 m (BWC) Minimum3. All ultimate loads are in kg.4. Bracketed figures indicate Minimum Vertical Load/Uplift Loads5. Angle of Deviation = 15 °6. Wind Load (Full Wind) on Tower Body shall be considered extra in all above assumptions.7. S.W. (Self Weight) of Tower shall be considered Extra.8. Assm. 12A, 13A & 14A indicates Right Side GW Broken conditions.9. Assm. 15A indicates Right Side Conductors Broken condition.10. Insulator Strings Weight & Wind on Strings are included in above Load.

