clarifications sought by prospective bidders · clarifications sought by prospective bidders ......

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Mariakani 400/220kV Substation

This clarification forms part of the Request for Proposal and Contract documents, and modifies them as follows:

1. CLARIFICATIONS SOUGHT BY PROSPECTIVE BIDDERS

S.No. Clause/Paragraph/Item No. Clarification/Query Response

152 Vol. 1 of 2;

Part 3: Conditions of Contract and Contract Forms;

Section VII: General Conditions;

Clause: 3.4.2(a)

Who will bear the income tax, VAT or any other applicable fees etc. for the service listed in Schedule No.3 and No.4 occurred in Kenya? Could you please list the rate of such tax in case the contractor should bear it? And please confirm that if we need include the tax in our quotation?

Who will bear the custom duty, imported tax, RDL and all other relevant levies/tax/fee etc. for the equipments list in Schedule No. 6 (5 yeas recommended spare parts)? If we need include these tax in our quotation?

This information will be provided in Addendum 1.

153 Vol. 1 of 2;



Clause: 3.4.2(a)

a. From the Kenyan tax Authority we have received some different information in what concerns the withholding tax! Please inform exactly if this tax is applicable only in the local services (in KSH) or in all invoices (including equipment).

b. Is KETRACTO, VAT exempted for this project? Shall we include the VAT amount in the local portion, quote it separately or make no mention to it, and afterwards when Invoice is submitted VAT will be charged as per regulations?

a. Withholding Tax is applicable on all invoices for an EPC contract without separating materials/equipment and services.

b. KETRACO will apply for VAT exemption for this project which implies that VAT will not be applicable on the invoiced amounts. See Addendum 1.

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154 Vol. 1 of 2;


Section VIII: Particular Conditions;

Clause: GC 3.4.2(a)

1. Please clarify that if the contractor need registry any subsidiary in Kenya during the execution and bank account opening, and if the subsidiary need bear the income tax of the Project.

There is no legal requirement for the contractor to register a local subsidiary or open a bank account locally. Local registration is optional.

The contractor has an obligation to pay income tax as per the Applicable tax law whether they have a local subsidiary or not.

2. Please confirm that the tax basis of Railway Development Levy is the CIF price of Schedule No.1 only. Please confirm that all relevant domestic Tax/Fee/levies for the equipments inside Schedule No.1, such as custom tax, income duty, sale tax etc., should bear by Owner.

The RDL is based on the Customs Value of the goods

The employer shall seek for exemption from Customs duty, RDL, IDF fees and VAT for the equipment under Schedule 1.

3. Please confirm that the contractor will not bear any local tax of Kenya of Schedule No.2.

Withholding tax (WHT) is advance tax charged on contractual fees. WHT is deducted by the employer from all the payments made to the contractor and the amount remitted to Kenya Revenue Authority.

WHT is tax on the contractor’s income and does not form part of the contract price. The contractor will therefore bear the WHT amount payable under Schedule 2.

The employer will seek for VAT exemption for the supplies made under Schedule 2.

4. We understand that during the execution of the project, the equipments in Schedule No.1 will be imported to Kenya by the name of you, and clear the custom without any tax/duty through the needed documents from you; we will pay the needed payment to local subcontractor for the work of Schedule 3 and Schedule 4

The employer will obtain tax exemption letters for exemption of VAT, Customs Duty, IDF Fees and RDL to be used during the clearance of imported equipment.

The local subcontractors will bear taxes payable

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and they will pay the needed tax by themselves. Is that correct? by them as per the requirement of the tax law. However this will not exempt the contractor from bearing the Withholding tax payable on their payments received under Schedule 3 and Schedule 4.

155 Vol. 1 of 2;


Section IX: Contract Forms;

Appendix 1: Terms and Procedures of Payment

There are no description about the document list for the application of payment, please kindly provide it.

This shall be agreed upon with the winning bidder.

156 Vol. 1 of 2;



Advance Payment Security Form

Paragraph 5

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Vol. 1 of 2;



Clause: 3.3.2 - Advance Payment

There are two kinds of description about expire of Advance payment security in the Tender document. Please kindly clarify which one should follow during the execution.

The description of the expiry date of the Advance Payment Security is clearly defined in the Advance Payment Security Form.

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Security

157 Vol. 1 of 2;



Performance Security Form

There are two forms of Performance Security (Bank Guarantee and Conditional Bank Guarantee), the first one is the normal practice and we don’t understand what’s the Conditional Bank Guarantee. Please kindly clarify which one should apply?

The Performance Security Form-Bank Guarantee applies.

158 Vol. 1 of 2;



Contract Agreement;

Article 3. Effective Date

Please add one more condition:

(e) Contractor take over the land, which is feasible for construction, from the Employer.

No.

159 Vol. 1 of 2;

Part 1: Bidding Procedures;

Section V: Bidding forms;

Price Schedule No. 2 & Price

Schedule No. 4

Item 10: Civil Works

We found "Item 10 CIVIL WORKS" is indicated in Schedule No.2, which should be the plant supply from Kenya as per clause 14.4 of ITB. Moreover, the same item i.e. "item 10 civil work" is found in Schedule No.4 too, we suppose the item 10 should be deleted from Schedule No.2 or please clarify what kind of work we should fill in schedule No.2.

The Bidder may keep as ‘zero cost’ the items they feel appropriate to do so, Civil works were included in both Schedules for completeness.

160 Vol. 2 of 2;

Part 2: Employer’s requirement;

Section VI: Requirements-Technical Specifications;

In Section VI - Requirements Technical Specifications, it is said “At Mariakani substation a store with a usable space area of 1600 square metres will be built.” But in the Price Schedules, there is no item about store. Please clarify about it. If it is contractor’s duty to build store, where to locate it?

Refer to TAC1; S. No.: 44 and 36.

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Clause: 11.2

161 Vol. 2 of 2;



Clause: 11.2

According to the bidding documents, the 110V and 48V battery units shall be Nickel-Cadmium (Ni-Cd) type. we propose to use Lead-acid type battery units instead of the Ni-Cd type because compare with the (Ni-Cd) type battery units, the Lead-acid type battery units are free of maintenance and more reliable.

Refer to TAC1; S. No.: 1.

162 Vol. 2 of 2;



Clause: 11.2

Please specify the minimum time that the 110V battery units shall be able to support the DC system in case of power failure happens, because the minimum time is a basic input data in the Capacity calculation of the battery units.

Refer to Section VI: Requirements-Technical Specifications; Clause: 11.2.

163 Vol. 2 of 2;



Clause: 22.11

The description about the Local water connection point in the new Bidding Document (Issued on: September 2014) is as follows:

"Local water connection point is 4km distance, to be arranged and

constructed by the Contractor"（22.11）;

"Local water connection point is 2km distance, to be arranged and

constructed by the Contractor"（22.11）.

Please clarify the distance of the Local water connection point.


The 16km pipeline is 100mm diameter and made of fiberglass or equivalent.

164 Vol. 2 of 2;



Please provide more details about the water connection point, the water source is from river or local city water supply system, is there any need of special treatment for the water?

Water connection point is from the local municipal water supply system. Bidders are advised that all water aspects shall be at bidders’ risk.

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Clause: 22.11

165 Vol. 2 of 2;


Section VI: Requirement - Technical Specification;

Clause: 22.17.12.1

The drainage system has been defined that the waste water(over flow from the septic tank) as well as the storm water shall be discharged to the soak pits outside the substation, is that allowed that the waste water and the storm water share one soak pit or shall be discharged to separate soak pit?

Refer to Section VI: Requirement - Technical Specification; Clause: 22.17.12.1. Surface water and foul drainage system shall be separate.

166 Volume 2 of 2;

Section VI: Requirements-Schedules of Technical Information;

Clause: 14.1

Power Transformer: Clause 14.1 (Note 1) of the technical specification states that “the autotransformer fitted with an OLTC shall have this located at the LV line-end”.

The Technical schedule (Section VI, page 601 of 677) further details that the OLTC location is LV line end and the type of flux voltage variation is C.F.V.V

Please confirm if the OLTC is to be located on the HV(400kV) side or LV(220kV) side.

If the OLTC is to be located on the LV line-end, design should be with VFVV instead of CFVV.

In addition to the above please refer to the below diagram for Auto Transformers & Tap Changer position.

Please select No. 1), 2) or 3).

Moreover, if No. 3) is the case, please also clarify whether it is on HV side or XV side. And please note that, in this case the flux voltage variation design shall be VFVV instead of CFVV.

Bidders shall follow the Specifications for now (LV line end and C.F.V.V), however alternative proposals can be discussed on Contract award.

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167 Vol. 2 of 2;



Appendix A – Bid Drawings;

Drawing number: PB-KET-2014-P-519, Rev3

LVAC: The LVAC Single line diagram (Drawing number PB-KET-2014-P-519, Rev3) does not have feeder sizes on the load side. Is it possible to get this information from the client?

As per note 1 in Drawing number PB-KET-2014-P-519 Rev3, the loads given are only indicative, final equipment sizes are dependent on the Contractors detailed design later.

168 Vol. 2 of 2;



Clause: 9.4

48 Vdc: The Technical Specification specifies the technical

schedule for the 48 Vdc as included in the Schedules of Technical

Information. Please supply the schedules of Technical information

for the 48 Vdc.

Bidding Document Volume 2 of 2; Section VI: Technical Specifications; Clause: 9.4.2.1, the design and provision of 48Vdc system is the Contractor’s responsibility.

169 Vol. 2 of 2; Reference is made to the above captioned project. We have worked with several partners in China and formed a joint venture

Refer to Section I: Instruction to Bidders; Clause:

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Part 1: Bidding Procedures:

Section I: Instruction to Bidders;

Clause: 19.8

to bid for the same. Since our partners do not have local bank accounts here in Kenya, we are writing this letter to inquire whether it is permissible that we produce a bid security in the name of China Wu Yi Co., Ltd only.

19.8.

170 Vol. 1 of 2;



Clause: GC 3.4.2(a)

From our understanding of the tender documents, except the RDL(Railway Duty Levy) for the imported goods, all the other taxes and/or fees relate to import goods(Schedule No.1) such as IDF(inspection declaration fee), custom tax bank guarantee fees shall not bear by contractor

Refer to Addendum 1.

171 Vol. 2 of 2;



Clause: 4.3.1

There is no requirement on break type of disconnector in the technical specification clause 4.3.1. Please clarify whether we could use pantograph type disconnector.

In line with Bidding Document Volume 2 of 2, Section VI, Technical Specifications, clause 3.2.1 paragraph 4, the bidder’s offer should comply with the principles shown in the bid drawings.

172 Vol. 1 of 2;


Section I: Instruction to Bidders;

Clause 13

Please clarify whether we could prepare two or more manufacturers on the same equipment with one price. Will this be considered as alternative bid?

Alternative bids are defined in Bidding Document Volume 1 of 2; Section I: Instructions to Bidders; Clause: ITB13. Two or more manufacturers for the same equipment are acceptable.

173 Vol. 2 of 2;



Clause: 8.1.5.2

Please inform if there is any request for supplying conventional control panels, since we don’t find related information on the specifications. If so, please inform about the quantity of panels requested - one for substation? One per diameter? One per bay? Inform also on the quantity of instruments, transducers, etc. per each conventional control panel.

Protection and Control cubicles’ requirements are given in Bidding Document Volume 2 of 2; Section VI: Technical Specifications; Clause: 8.5.1.2.

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174 TAC1, S. No. 133 In view of the addition of the Nos. 2 of Neutral Earthing reactors for Isinya Line as per the clarification no.133 of the Addendum TAC1; considering the need to get full proposals from the manufacturers of the reactors and the fact that we are receiving a relatively slow response from most of them; in order to have be able to submit our responsive and most competitive offer , hereby, we kindly request you to consider an extension of fifteen (15) days on the submission date.

There shall be no extension of the bid closing date.

175 Vol. 1 of 2;


Section II: Bid Data Sheet;

Section D: Submission & opening of Bids;

Clause: ITB 22.1

As many supporting vendors are requested for additional time for providing the required Data & Inputs for the BID, Request please consider for Extension of Bid Submission by 3 weeks i.e. The New Date for Submission to 31st March’15

Request Please confirm.

There shall be no extension of the bid closing date.

176 Vol. 1 of 2;


Section III: Evaluation and Qualification Criteria;

Clause: 2.1.1.6

KEC are executing the Sub Station projects under KPLC & KETRACO. There are 17 substation under 3 Lots of these contract .As many of the sites were handed over for construction after the expiry of the OROGINAL CONTRACT Period and since the contract are being executed under Extension of Time , the average progress of the work is 60-65%.

In View of the above WE request you to review and reduce the qualification requirement as Under

“Companies Should have completed at least 50% of the ongoing substation contracts awarded in Kenya with in contractual Time.

Request Please confirm.

The request is rejected.

177 Vol. 2 of 2; Please note that there is a discrepancy between general layout ref The drawings are for tender purposes only, in the

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Part 2: Employer’s Requirements;


Appendix A – Bid Drawings;

Drawing number: PB-KET-2014-L-504

PB-KET-2014-L-504 and the topographic survey drawing.

According to topographic drawing, the dimensions is 186mx 349m and the substation size shall be 186mx 459m to implement the whole substation.

meantime where there are contradictions, please use PB-KET-2014-L-504.

178 Please confirm that the substation area can be a little bigger: as a future diameter has been added on the 220kV side, additional space may be necessary to locate the control building, the store, and the houses.

The plot is 200 acres, this is more than adequate for the substation switch yard, control building, store and staff houses.

Location of control building, store and staff houses is subject to detailed design, with KETRACO’s approval, after Contract award.

179 Vol. 1 of 2;

Part 3: Contract Forms;


Clause: GC 4.9.5

We understand from your clarification TAC N°1 #89 that the Time of Completion shall include the pre-commissioning but not the Commissioning of the Facilities.

However, we've noticed in Particular Conditions the following inconsistency as it is stated "GC 4.9.5: The Guarantee Test of the Facilities shall be successfully completed by the date of Completion."

Guarantee test being performed during Commissioning of the Facilities please confirm that the foregoing provision is misleading and will be cancelled from the Particular Conditions.

Confirmed. The completion time for the Guarantee Test will be finalized on Contract award.

180 Volume 1 of 2;


Section III: Evaluation and

We understand from section III “Evaluation and Qualification Criteria” and section VI-Part 2- §14.4 page 238 of 677 that some minimum Functional Guarantee are required in respect of the

The ‘Functional Guarantees’ referred to in section III are in line with the statement in Appendix 8 which says, ‘However, material and equipment

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Qualification criteria;

Clause: 1.7(c)

&

Vol.2 of 2;



Clause: 14.4

performance of the contract. However, in the meantime, it is noticed under SECTION IX-Contract Forms-Appendix 8 “Functional Guarantees”, that “Functional guarantees are inappropriate for this contract”. Could you please confirm that this Appendix 8 shall be modified as follow: “Functional guarantees are in accordance with requirement set forth per Section III “Evaluation and Qualification Criteria”.

supplied shall confirm in all respects to the technical specification and the schedules of technical information and be fit for purpose.’

Also note the last paragraph of Bidding Document Volume 1 of 2; Section III: Evaluation and Qualification criteria; Clause: 1.7(c).

181 Vol.2 of 2;



Clause: 14 & 15

Please confirm that the monitoring system for shunt reactors and transformers shall be continuous type.

Confirmed.

182 Vol.2 of 2;


Section VI: Requirements-Schedule of Technical Information

Please confirm that current ratings : - Between the two busbars 400kV, the current shall be 4000A and between the two busbars 220kV the current shall be 2000A. - For transformers and shunt reactors feeder, the current shall be as per the transformer or shunt reactor power.

Confirmed.

183 Vol.2 of 2;



Please confirm that no calculation of loads of the existing towers shall be done, and that the contractor will directly use those towers as terminal towers directly.

Confirmed.

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Clause: 23

184 Vol.2 of 2;



Clause: 23.1.3.1

Please confirm that existing conductors, OPGW and strain strings of Rabai - Isinya line, described in annexes of the employer's requirement, can be reused. Consequently, no conductor, OPGW, nor strain strings will be quoted for the 400 and 220kV OHL works.

Confirmed.

185 Vol.2 of 2;


Section VI: Requirements-Schedule of Technical Information

The maximum conductor temperature is given as 80°C. IEC allows to consider maximum conductor temperature of 90°C. Please confirm that IEC can be followed.

Follow the specifications.

186 Vol. 2 of 2;



Clause: 1.6

It is stated that "for design purpose, a maximum wind velocity of 140km/h shall be assumed".IEC 826 defines the reference wind speed (mean wind speed for a duration of 10minutes at 10m height) and the gust wind speed (3 or 5s).As 140km/h is the "maximum wind velocity", we consider that it is the gust wind 3sec, not the referenece widn speed. Please confirm.Please note that, if 140km/h would have to be considered as the reference wind speed defined in IEC 826, then the wind pressure on conductors would be enormous and would require additional post insulators between equipements.

We are not familiar with the use of IEC 826 for strain busbar wind load calculations for substations as the spans are generally shorter than for OHL.

The post insulators will ordinarily be supporting rigid busbars whose wind loads are normally determined by standards like BS7354, BS6399-2, EN1991-1-4 or IEEE605.

The need for additional post insulators will have to be discussed with KETRACO during detailed design.

187 Vol. 2 of 2;


Section VI: Requirements-Technical

Please confirm what are the future feeders :400kV :- Diameter 1 : The future feeder is a line feeder- Diameter 2 : The future feeder is a line feeder- Diameter 3 : The future feeder is an autotransformer feeder- Diameter 4 : The future feeder is an autotransformer feeder- Diameter 5 : The future feeder is an autotransformer

Where there are contradictions please use the 400kV and 220kV SLDs as the basis for your bid.

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Specifications;

Appendix A – Bid Drawings

feeder (as shown on the detailed SLD, and contrary to what is shown on the 400kV SLD)- Diameter 6 : The future feeder is an autotransformer feeder (as shown on the detailed SLD, and contrary to what is shown on the 400kV SLD)220kV:- Diameter 1: No future- Diameter 2 : No future- Diameter 3 : The two future feeders are autotransformer feeders- Diameter 4 : One future feeder is an autotransformer feeder, the two others are line feeders. This is inconsistent with the 400kV side. Please clarify.

188

Please confirm that the substation area can be a little bigger: as a future diameter has been added on the 220kV side, additional space may be necessary to locate the control building, the store, and the houses.


189 Vol. 2 of 2;



Cause: 13.8

The type of alarms to be acquired from each type of bay at 220kV substation is given in this annex. However no information is given on alarms to be acquired for 400kV substation. Please confirm that the same type of alarms shall be considered.

Since there is no existing 400kV circuits, for the sake of the Bid, please use the provided 220kV alarms, the full list of the 400kV alarms will be agreed with KETRACO during detailed design.

190 Please confirm that Mariakani will be connected to the Rabai RCC.

It will be connected to both Rabai Control Centre (RCC) and National Control Centre (NCC).

191 Vol. 1 of 2;


Section IV: Bidding Forms-Price Schedules;

Price Schedules

As per 400kV/220kV Layout drawing, some additional post insulators may have to be added depending on the efforts admissible on top of equipments. Please confirm that we should quote as per the quantities given in the price schedule.

Confirmed.

192 Volume 1 of 2; Please clarify the loss evaluation : how many years will be The conditions are given in Bidding Document, Volume 1 of 2, Section III Evaluation and

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Section III: Evaluation and Qualification criteria;

Clause: 1.7(c)

considered, for how many hours on load, etc. Qualification criteria clause 1.7 (c).

193 Please clarify the type of differential protection installed on remote end substations (Rabai 1, 2 and 3, Kiambere, Malindi, Dongo Kundu 1 and 2, Isinya 1 and 2).

Refer to TAC1; S. No.: 33 and TAC2; S. No.: 214.

194 Vol. 2 of 2;




Please confirm that, as represented on the 400kV SLD and the 400kV layout, a circuit breaker and a disconnector shall be added on shunt reactor feeders of diameter 5 and 6 on the detailed SLD.

Confirmed.

195 Vol. 2 of 2;



Cause: 13

According to the specification, only 16AI and 32DI should be provided as spare for future use :“For future use, a separate DAU shall be provided with 16 analogue and 32 event channels. This shall be available as a spare-point wherein all the equipment is fully installed, and wired into FMS cubicles with all the modules in place, but not utilized.”Please confirm that, in total, the fault recorder shall be sized for 104AI and 208DI for each voltage level including future bays as per the SLDs.

This is subject to detailed design.

196 Vol. 2 of 2;



Clause(s): 3.3.7 and 3.3.8.

Please confirm that insulators can be composite or porcelain type Insulator requirements are given in Bidding Document Volume 2 of 2; Section VI: Technical Specifications; Clause(s): 3.3.7 and 3.3.8.

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197 Vol. 2 of 2;




Drawings:PB-KET-2014-L-508, PB-KET-2014-L-507, PB-KET-2014-L-506, PB-KET-2014-L-505 & PB-KET-2014-L-504

We found some discrepancies between the distances stated in the drawings in annex of the specification and IEC 61936. Please confirm that IEC shall apply; please refer to "Distances" Sheet.

The given minimum clearances are an interpretation of IEC61936-1 in line with local conditions. Bidders are free to present their own views of the standard on Contract award.

198 Vol. 2 of 2;



Clause: 22.18

As per our experience and contrary to TAC 1 Item 34, the metering panel is generally installed in the control room in Kenya. Please confirm that we can install it in the control room instead of the relay room

This is subject to detailed design by the winning bidder.

199 Vol. 2 of 2;



Clause: 22.18

TAC 1 Item 34 : Please confirm that the "relay and metering panels room" is the same as the "*control and protection room"

Confirmed.

200 TAC 1; S. No.: 92

&

Vol.2 of 2;


Item 92 of TAC 1 states "Regarding the OHL, one tower has to be dismantled and transported to KETRACO warehouse at site of construction. Please confirm that this is correct and nothing has to be made regarding the foundations". The answer given is "confirmed".However, item 143 of TAC 1 states "no tower to be built of modified and no civil work to be done; only one tower has

We confirm that the civil works to be done includes demolishing the foundation to ground level.

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Clause: 23.1.3.1

to be dismantled and some conductors and strain strings have to be reused and relocated on landing gantries of the substation. Please confirm"; the answer given is "Confirmed, However the foundation should be demolished to ground level".Please confirm which of the two clarifications should we take into account: what work has to be done on the foundations of the existing tower to be dismantled?

201 Vol. 2 of 2;



Clause: 22.5.1 & 22.5.2

Like it has be done for the single unit houses, please transmit a drawing for double unit houses.

Refer to attached drawing SDH -2-2- Mariakani Housing Units.

202 Vol. 1 of 2;


Section IV: Bidding Forms-Price

Schedules;

Price schedule No. 2

As some additional diameters (in particular futures diameter and lines and transformer bays) have been added in this tender compared to the previous one, the size of the building (600m²) may be insuficient. Please confirm that we should quote the necessary surface instead of 600m².

For fair assessment of bids follow the specifications, additional details can be discussed on Contract award.

203 Vol. 1 of 2;


Section VII - General Conditions;

Clause:5.2

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Tender documents in reference require a Defect Liability period of 1 year after Operational Acceptance and require an Extended Defect Liability period for critical components. It was clarified in Tender Addendum & Clarification in reference that duration should be 5 years. Question : is this duration including the initial Defect Liability period of 1 year or is it, in addition to it ?

It is confirmed it includes the initial Defect Liability period of 1 year.

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Clause: GC 5.2

204 Vol. 1 of 2;


Section IX: Contract Forms

Appendix 1: Terms and Procedures of Payment

We would like you to clarify in Schedule N° 1, Schedule N° 2, Schedule N° 3, Schedule N° 4, whether the payments shall be made within forty-five (45) days or within sixty (60) days after the receipt of invoice. Based on our previous experience, common practive for payments in large international contracts, is to have payments done within forty-five (45) days. For your information EU Directive 2011/7/UE, in case iof public tenders, even requires thirty (30) days.

Confirmed that it is 60days after the receipt of the invoice with relevant supporting documentation.

Note: Any submitted incomplete and/or incorrect invoice without the relevant supporting documentation shall be rejected. The 60 days shall start upon its proper resubmission.

205 Vol. 2 of 2;



Clause: 21

"The diesel generator shall be provided with an emergency starting air receiver sized to provide ample storage to allow at last 12 consecutive starts without re-pressurizing between start" … "3 compressors arranged in parallel shall be provided for the diesel generator units. (...) two compressors shall be motor driven and the third (abck up) compressor shall be driven by a battery start diesel engine with provision for manual cranking"This requirement is quite an obsolete technology; we would recommend a standard start of the diesel generator, using the batteries.Please confirm that this is acceptable.

Confirmed.

206 Vol. 2 of 2;



Clause: 21

- In addition of the daily tank, please indicate if a storage tank is required. If yes, which capacity ? - Please indicate the noise level limit for the silencer of the diesel generator.

No additional tank is specified.

Noise level limits were not a strict requirement, however for guidance you can use 70dB.

207 Vol. 2 of 2; We noticed a discrepancy between the drawings in annex and the specification :

The Technical Specifications in the Bid document supersedes the drawings. The drawings indicate

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Drawings: PB-KET-2014-L-504, PB-KET-2014-L-505, PB-KET-2014-L-506

It is specified 7,3m for major access road (we understand for heavy roads) and 5m for access road (we understand other roads than heavy ones). In the drawings and according to the scale, roads are shown of 5m for heavy roads and main access roads and of 3m for other ones. Please confirm that we can consider 5m for heavy roads and 3m for the other ones.

the general layout of the substation.

The main access road from the substation to Mombasa road shall be a 12m road with two lanes of 3.5m, shoulders of 1.5m and provision for the drainage facilities.

Access roads within the substation shall have a carriage way of 5m wide and provision for the necessary kerbs and drainage facilities.

208 Vol. 2 of 2;




Drawings: PB-KET-2014-L-504, PB-KET-2014-L-505, PB-KET-2014-L-506

No suspension sets are listed in the price schedule whereas they are shown on the section views inside the diameters. Please confirm that a "Suspension set or Underhung post insulator" item shall be added in price schedule.

Suspension sets were accounted for in the ‘Post insulator – Underhung insulator’.

209

Please confirm that the heavy roads shall be all along the transformers and shunt reactor areas, including future ones.

Not confirmed.

210 Volume 2 of 2;



Clause: 1.2.1.

Please confirm that , as skeleton bays, future shall be equipped with cable trenches, including future transformers and shunt reactors areas, including road crossing, etc.

Requirement for future bays are given in Bidding Document Volume 2 of 2; Section VI: Technical Specifications; Clause: 1.2.1.

211 Vol. 2 of 2;


Could your please indcate in meter the position of each tower from each other in both direction.

Refer to drawing number PB-KET-2014-L-501.

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Drawings: PB-KET-2014-L-501

212 Vol. 2 of 2;



Clause: 22.17.15

What is the length of the access road? The length of the main access road to Mombasa road is 2km.

213 Vol. 2 of 2;



Clause: 15.3.1 & 15.3.2

Clause 15.3.1 Performance evaluation and 15.3.2 Penalty; please advise what was to be advised?

The same philosophy as with Power Transformer’s functional guarantees shall be used.

214 Vol. 2 of 2; Part 2: Employer’s requirement; Section VI: Requirements-Technical Specifications; Clause: 8.2.2.2 & Appendix A – Bid Drawings

Protection SLD

What is the make of protection relays for 400kV Isinya 1 and Isinya 2 lines?

400kV Isinya 1 & 2 line is currently under design and Bidders are free to propose make and type of their own choice. Further discussion will be held with the winning bidder.

215 Vol. 2 of 2;


Are we erecting gantry and structures directly under the existing

MNTL?

No. The line shall be energized during the period of construction of Mariakani substation. The programming of the diversion of the Mombasa-

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Nairobi Transmission Line (MNTL) into the substation shall be scheduled by the contractor such that the line remains in service for as long as possible.

216 Vol. 2 of 2;




Drawings: PB-KET-2014-L-506, PB-KET-2014-P-513,514, PB-KET-2014-P-511,512

LAYOUT : PB-KET-2014-L-506 -> Reactor feeder circuit has the CB(1set) & DS(2set) PROTECTION SINGLE LINE DIAGRAM : PB-KET-2014-P-513,514-> Reactor feeder circuit has the DS only. PB-KET-2014-P-511,512 -> Reactor feeder circuit has the CB(1set) & DS(2set)

CB & DS may be not marked in the Protection Single Line Diagram(513,514) Please clarify which one we should apply.

They were some omissions on the Protection Single Line Diagrams; however the drawings PB-KET-2014-L-502 and PB-KET-2014-L-503 remain a correct representation of the equipment to be supplied.

217 Vol. 2 of 2;




Gantry (Secondary side of IBT) height is 22.5M in the section DWG, that means it is 400kV Gantry, but not included in the Price schedule. (if include, total quantity of 400kV Gantry shall be 33 No). May be, The height of 400kV gantry is incorrectly marked in the section DWG. Total quantity of 220kV shall be 46 no as shown in the 220kV Layout.

1. Please clarify Gantry height with Secondary side of IBT.

1. IBT secondary side gantries are the same as 400kV side gantries, hence they are included in the total number of 400kV gantries.

2. The number of 220kV gantries given in Price Schedules is correct.

22


2. Please clarify exact quantity for 220kV Gantry. 3. Gantry beam item is not included in Price schedule.

218 Required location of Aux Transformer is not marked in the layout.

Please provide location for Aux transformer.

Auxiliary transformer location is subject to the Bidder’s detailed design with KETRACO’s approval.

219 Vol. 1 of 2;



Schedules;

Price schedule No .1 & 4

Items: 1.3 & 1.4

Please clarify Using point & Accurate quantity of DS w/ 1ES & DS w/ 2ES is required.

These items are in Bidding Document, Volume 1 of 2, Section IV: Bidding Forms; Price Schedule(s) No 1 and 4 as items 1.3 and 1.4 for 400kV and items 2.3 and 2.4 for 220kV

220 Vol. 2 of 2;



Clause: 3.3.9

Please provide the material of Aluminium tubular conductor. The design of busbars shall comply with Bidding Document Volume 2 of 2, Section VI: Technical Specifications, Clause: 3.3.9.

221 Vol. 2 of 2;



Clause: 11.3

We found that there are some discrepancies between your drawing and your list. In addition, the quantity for each type of circuit breaker is not indicated. Please provide quantity for each type of circuit breaker.

Auxiliary system design is the Bidder’s responsibility ensuring that they comply with Bidding Document Volume 2 of 2; Section VI: Technical Specifications; Clause: 11.3.

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222 Vol. 2 of 2;



Clause: 9.4.2.1

&

Section VI: Requirements-Schedule of Technical Information;

Item J: LV services & B: DC systems

We could not find any load details for 48V DC system. Please provide the load details or Ah capacity for 48V Battery also.

In line with Bidding Document Volume 2 of 2; Section VI: Technical Specifications; Clause: 9.4.2.1; Paragraph: 1, it is the Contractor’s responsibility to design the 48V DC system.

Voltage Window (Minimum & Maximum Voltage) and End Cell Voltage (E.C.V.) / Number of Cells per Battery. Please provide information voltage window and E.C.V / No of cells per each Battery

Requirements for DC systems are given in Bidding Document Volume 2 of 2; Section VI: Schedules of Technical information; J: LV services, B: DC systems.

223 Vol. 2 of 2;


Section VI: Requirements-Technical Specifications

TOV (Temporary Over Voltage) requirement is exceptionally high. MCOV of 260 * the 2.3 TOV requirement yields a COV requirement of 598kV. Please clarify if 2.3pu of TOV is correct and the amount of time the 2.3pu of TOV would be present.

Follow the specifications.

224 Vol. 1 of 2;



Schedules;

Price schedule No .2;

Item 10.12

Please define about the road for lighting. Is this access road or internal road?

The definite works include lighting access roads within the substation. However, lighting requirements for main access road (from substation to Mombasa Road) will be agreed with KETRACO on Contract award.

225 Vol. 1 of 2;


The staff house and generator house are included in the substation scope ofwork.Whereas in the price schedule of civil works they are notavailable.Kindly clarify.

Staff houses are given in Bidding Document, Volume 1 of 2; Section IV: Bidding Forms; Price Schedule(s) No 2 and 4 as Items: 14.4 and 14.5.

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END


Schedules

Price Schedule No.: 2 & 4

Please add to Bidding Document, Volume 1 of 2; Section IV: Bidding Forms; Price Schedule(s) No 2 and 4; Item: 14.6 - Generator house.

226 Vol. 1 of 2;



Clause: GCC 3.4.2(a)

Please confirm that GOK(2.25% of CIF Value, an import declaration fee) will not be charged on all plant imported from aboard)

Import Declaration fees will not be charged.

Official aid funded projects are exempted from the payment of Import Declaration Fees charged on the imported plant.

227 Vol. 1 of 2;


Section I: Instructions to Bidders;

Clause: 2.7

Please confirm that 10 years construction experience as Civil works/Electromechanical contractor on the field of substation construction works is considered as general experience and Minimum Criteria to be met for local civil works and local electromechanical works completed project within the last five years can be the specific experience. in regardless of the minimum criteria to be met for local civil works and local electromechanical works, 10 years experience on the field of substation construction will be mandatory.

The Minimum criteria for subcontractors is as follows:

Civil works sub-contractors – minimum 10 years general experience required as a contractor and 3 years specific experience in substation works.

Electromechanical works sub-contractors – minimum 5 years general experience required as a contractor and 3 years specific experience in substation works.

228 Vol. 1 of 2;


Section I: Instructions to Bidders

Please confirm if the bidders haven't awarded any projects yet in Kenya, this factor will not be a problem to participate this tender.

Confirmed.

clarifications sought by prospective bidders · clarifications sought by prospective bidders ......

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