ZAMBEZI RIVER AUTHORITY TURBINE FLOW METERING AT KARIBA

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					          ZAMBEZI RIVER AUTHORITY




     TURBINE FLOW METERING AT KARIBA
HYDROELECTRIC POWER STATIONS AND ASSOCIATED
                 WORKS

              TEMDER DOCUMENTS

               CONTRACT No. C148




              TERMS OF REFERENCE

                      AND

                 SPEFICATIONS




                Dated: March 2008




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                               TABLE OF CONTENTS

                                                                       Page
Definitions ……………………………………..……………….….                                    i
Terms of Reference ……………………………………………….…..                               ii
1. SECTION I: Background Information …..…………………………                      1
1.1 Introduction …….……………………………………….………..                               1
1.2 Background ……………………………………………………….                                   1
1.2.1 Objectives of the Assignment ……..……………………………                      2
1.2.2 Specific Objectives ……………………………………………...                          2
1.3 Equipment Specifications ………………………………………....                        2
1.4 Drawings: …………………………………………………………                                    4
1.4.1 Cross Section through Intakes, Surge Chamber Penstocks
      and Underground Power Station          ………..………….………              4
1.4.2 Typical Longitudinal Section of Scheme …………………..…..               5
2. SECTION II: INFORMATION TO CONTRACTOR ………………. 6
2.1 Location, Access and Movement about the site ………………….…. 6
2.2 Site Working Conditions ………………………………………….…. 6
2.3 Information and Facilities provided by the ZRA ………………….... 7
2.4 Preparation of Proposal ………………………………………….…. 7
2.5 Submission, Receipt and Opening of Proposals …………………… 8
2.6 Evaluation of Proposals ……………………………………………. 9
2.7 Award of Contract …………………………………………….……. 9
2.8 Negotiations       ………………………………………………….…. 9
2.9 Confidentiality …………………………………………………….... 9
Appendix I: Extract from Hartmann Braun’s “Technical
             Description” of Existing Flow Measuring Equipment
Appendix II: Status Report on the Turbine Discharge Measuring System
               at Kariba North Bank and Kariba South Bank Power Stations
Appendix III: Merz and Maclellan Report on Flow Measurement




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DEFINITION OF TERMS AND ACRONAMES
Client       -  means the Zambezi River Authority
Contractor -    means successful Tenderer
CAPCO       -   Central African Power Corporation
KNB          -  Kariba North Bank Power station
KSB           - Kariba South Bank Power station
ZRA          -  Zambezi River Authority




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                       SECTION I: BACKGROUND INFORMATION

1.1   INTRODUCTION

      The Zambezi River Authority (ZRA) was established as a body corporate on the 1st
      October 1987 by parallel legislation in the Parliaments of Zambia and Zimbabwe
      following the dissolution and reconstitution of the Central African Power Corporation
      (CAPCO). The Authority is jointly owned by the two Governments of Zambia and
      Zimbabwe (the Contracting States) in equal proportions and operates under the
      Zambezi River Authority Acts of 1987 as amended.

      The ZRA is governed by a Council of Ministers consisting of four members, two
      Ministers from each Contracting State. There is a Chief Executive of the ZRA who
      reports to a Board of Directors made up of six members, three from each Contracting
      State. The total staff complement is 148 with the ZRA operating from three Offices in
      Lusaka (Head Office), Kariba and Harare. The ZRA has a network of thirteen
      telemetry stations spread over the catchment area of the Zambezi River falling in the
      two Contracting States from its source to Lake Kariba which measure water quality
      and quantity. There is a ZRA member of staff at each of the telemetry stations.

      The functions of the Authority are set out in the schedule to the ZRA Acts of 1987
      and in the booklet “ZAMBEZI RIVER AUTHORITY - AN OVERVIEW” dated
      August 2005. One of these functions is to allocate water to the power utilities for
      power generation and thereafter to monitor the water usage. Monitoring of the water
      usage is achieved through flow meters installed at Kariba North Bank and Kariba
      South Bank power stations.

1.2   BACKGROUND

      The existing flow meters at Kariba Power stations were installed with the assistance
      of Hartmann and Braun of South Africa in 1996. The system installed by Hartmann
      and Braun consists of primary meters (Protronic and Differential Pressure
      Transmitters) linked electronically to the computerized Supervisory Control and Data
      Acquisition (SCADA) system. The SCADA system has computers installed in the
      power stations control rooms and others at the ZRA Hydro Office in Kariba. The
      system measures turbine flow in cumecs based on the principle of Winter-Kennedy.
      Contractors are referred to Appendix I, which is an extract from the “Technical
      Description” of the flow meters installed. Appendix I will form part of the tender
      documents.

      The current operational state of the flow meters is given in the brief Report by ZRA in
      Appendix II. It is clear from the Report that the system is experiencing functional
      problems and therefore its operational state is unsatisfactory. In fact, some
      installations on some turbines have not been replaced after the refurbishment works in
      the power stations were completed. Consequently the ZRA has no accurate means of
      monitoring water usage to appropriately bill the utilities for water used.

      Contractors should take note that Kariba South Bank (KSB) power station has
      completed refurbishment works and uprated its capacity to 750 MW while



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          refurbishment works are in progress at Kariba North Bank (KNB) with about 50%
          work already completed. The KNB uprating will raise the capacity to 120 MW.

          Prior to the existing installations of flow meters the ZRA had contracted Merz and
          Mclellan to ascertain whether flow meters could be installed at the Kariba power
          stations. The report of that investigation is also attached as Appendix III and will be
          part of the tender documents as it contains useful information.

1.2.1     Objectives of the Assignment

1.2.1.1 The overall objective of the assignment is to put in place an up-to-date turbine flow
        measuring system to enable the ZRA monitor water usage and accordingly bill the
        power utilities for the water used in power generation.

1.2.2     Specific Objectives:

          There are ten (10) turbines, six (6) at Kariba South Bank and four (4) at Kariba North
          Bank power stations. The Contractor will be required to

          (i)     To supply equipment for the replacement of the existing flow measuring
                  equipment with new and up-to-date technology since the existing equipment is
                  malfunctioning and giving a lot of operational problems. Thereby install,
                  calibrate and handover the equipment etc. on turn-key basis to the satisfaction
                  of the Client meeting the objectives fully.

        (ii)      Extend remote transmission of flow data to ZRA Headquarters in
                  Lusaka/Harare Offices and Hydro Offices, Kariba in Zimbabwe.

        (iii)     Provide on-the-job training to ZRA, ZESA and ZESCO counterpart staff and
                  formal training to ZRA staff on the operation and maintenance of the system
                  to ensure sustainability.

1.3       Equipment Specifications

          (i)     The equipment supplied and installed on each of the ten (10) turbines should
                  be capable to obtain water flow data from each turbine including flow when
                  the turbine is in spinning reserve at each of the two power stations on real time
                  basis and to have a totalizer facility for recording integrated flow and volume
                  from each power station separately. In a similar manner obtain energy
                  generated from each plant. The facility must also be able to give lake level.

                  The Contractor should provide information on where similar flow meters have
                  been installed in Africa or places with similar conditions as Zambia/Zimbabwe
                  or elsewhere in the world to enable ZRA to check the suitability of the
                  equipment.

          (ii)    To carry out necessary calibrations to obtain accuracy levels of 0.1%.

          (iii)    Calibration equipment for future use, user and maintenance manuals and
                  backup software has to be supplied together with the rest of the equipment.


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(iv)   To put in place a mechanism for remote transmission of the above data to the
       hydrological Offices situated at the Heights in Kariba, Zimbabwe and ZRA
       Headquarters in Lusaka/Harare.




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SECTION II: INFORMATION TO CONTRACTOR

2.1     Location Access and Movement about the site

2.1.1   The site of the works is at Kariba North and Kariba South Power Stations at Kariba
        Dam itself is situated on the Zambia/Zimbabwe border, 200 kilometers from Lusaka
        and 360 kilometers from Harare.

2.1.2   The Contractor shall, except where otherwise specified, make all his own arrangement
        and satisfy himself as to means of access to the site, transport of equipment,
        personnel, and any other accessories, supply of oil, petrol, and other materials and
        matters or things which may be necessary for the due performance of the contract.

2.1.3   The Contractor will be required to conform to all security and operational regulations
        laid down by the Client and shall be responsible for all his employees in this respect.

2.1.4   The Contractor shall, when necessary be required to arrange with the Client for the
        issue of Entry Permits for his employees for access to the site.

2.1.5   Access to the site shall be available to the Contractor for his operations between the
        hours of 06:00 am to 17:00 hrs form Monday to Saturday, occasional night and/or
        week-end work may be authorized by the Client if justified and requested in advance
        by the Contractor.

2.2     Site Working Conditions

2.2.1   The Contractor shall maintain the whole area of the works in a clean, tidy and safe
        condition by arranging his equipment in an orderly manner. All spoil, rubbish and
        waste material, debris and the like shall be systematically cleared off the working
        areas as it accumulates, removed from the site and transported to the dumping areas
        indicated by the ZRA.

2.2.2   The Contractor shall confine his operations to the minimum area of the ground
        required for the works and shall give written instructions to his site staff on all
        relevant aspects in the specification.

2.2.3   Upon the instruction of the ZRA when the works have been completed, the Contractor
        shall remove from the site all his plant and equipment and all surplus materials and
        shall leave the site in a clean, tidy and workmanlike condition to the ZRA’s
        satisfaction. He shall make good any damage, whether in the vicinity of the access
        route to each location of work, or elsewhere, to the satisfaction of the ZRA.

2.2.4   The Contractor shall arrange for a Fist Aid post and equip and maintain it to the
        satisfaction of the Client throughout the contract at his own cost

2.3     Information and Facilities provided by Zambezi River Authority

2.3.1   The Zambezi River Authority will provide the Contractor with necessary information
        on the existing installations, and any other information as required and which is
        available.


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2.3.2   Drawings showing cross sections through intakes, surge chambers, penstocks, etc. at
        both power stations are attached.

2.3.3   The Zambezi River Authority may, if available provide electricity supply from the
        existing points for the use by the Contractor for any work requiring electrical driven
        machinery and for lighting. The Contractor shall ascertain the adequacy of any supply
        and provide his own electric power, if necessary, at his own cost.

2.4     Preparation of Proposal

2.4.1         Contractors are requested to submit written Proposals in English language.

2.4.2     In preparing the Tender Proposal, Contractors are expected to examine the TOR and
        other documents in the Tender Dossier detail. Material deficiencies in providing the
        information required may result in the rejection of the Tender Proposal.

2.4.3       The Tender Proposal should provide the following information:

        (i)       Any comments or suggestions on the TOR and on the data, a list of services,
                  and facilities to be provided by ZRA.
        (ii)      A detailed work plan for performing the assignment
        (iii)     All costs associated with the assignment, broken down by activity, which
                  includes (a) removal of the existing flow meters, (b) replacement of
                  equipment, (c) installation, (d) transportation, (e) training of counterpart
                  staff from ZRA, ZESA and ZESCO, (f) calibration and
                  (g) commissioning.
        (iv)      Contact names of organizations where similar equipment is installed in
                  conditions similar to those obtaining in Zambia and Zimbabwe.

2.4.4   Contractors must express the price of their services in United States Dollars (US$)

2.4.5   The equipment cost should be CFI at site for each of the power stations separately in
        American Dollars. Please note that the cost of preparing the Tender Proposal and the
        visit to the project site will be the responsibility of the Contractor.

2.4.6   It is the Contractor’s responsibility to obtain import permits etc. However, the Client
        will assist with necessary documentation.

2.4.7       Payments to the Contractor will be effected as follows:

        ∙         50% of the Tender amount will be released after all the relevant equipment is
                  received at the site
        ∙         Final payment will be made subject to the successful completion of the project
                  to the complete satisfaction of the Client after commissioning and handover of
                  the works ensured to the stated accuracy levels.

2.4.8   Compliance of local contractual conditions will apply for all other relevant issues not
        mentioned in this document.



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2.4.9   The work should be completed in all respects by the stated and approved date in the
        submitted Tender and fully operational to the satisfaction of the Client. The penalty
        for not meeting the final date is one percent per week of delay of the total contract
        sum.

2.4.10 The Contractor should give a warranty for the satisfactory functioning of the
       equipment after commissioning of at least one year.

2.5 Submission, Receipt, and Opening of Tender Proposals

2.5.1   The original Tender Proposal should be prepared in indelible ink. It shall contain no
        interlineations or overwriting, except as necessary to correct errors made by the
        Contractor. Any such corrections must be initialed by the persons or person who sign
        (s) the Tender Proposal

2.5.2 An authorized representative of the Contractor shall initial all the pages of the Tender
      Proposal. The representative’s authorization shall be confirmed by a written power of
      attorney accompanying the proposal.

2.5.3   For each Tender Proposal the Contractor shall prepare and submit five copies with
        one copy marked “ORIGINAL” and the remainder shall be marked “COPY” as
        appropriate. If there are any discrepancies between the original and the copies, the
        original governs.

2.5.4   Contractors are required to deliver the completed proposal at this address: ZAMBEZI
        RIVER AUTHORITY, KARIBA HOUSE, 32 CHA CHA CHA ROAD, P. O. BOX
        30233, LUSAKA, ZAMBIA before 16:00 hrs on 30th May 2008. Any Tender
        Proposal received after the closing time for submission shall be returned unopened.
        The original and all copies of the proposal shall be placed in a plain sealed envelop
        clearly marked “Tender – Flow Metering”.

2.5.5   After the deadline for submission of Tender Proposals, the Tender Proposal shall be
        opened immediately by the ZRA Tender Committee.

2.6     Evaluation of Proposals

2.6.1   Proposals will be opened publicly in the presence of the Contractor’s representatives
        who choose to attend. The name of the Contractor and the total contract price will be
        read aloud and recorded when the proposals are opened.

2.6.2   The Tender Committee of the ZRA will evaluate the Tender Proposals on the basis of
        responsiveness to the Terms of Reference, applying the evaluation criteria.

2.6.3   The highest ranked Contractor selected on the basis of the Technical and Contract
        price of their Tender Proposal will be invited to negotiations.

2.7     Award of the Contract

2.7.1   The Contract will be awarded following negotiations. The negotiations will be held at
        the ZRA’s Head office, Kariba House, 32 Cha Cha Cha Road, Lusaka. After the


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        negotiations are completed, the ZRA will promptly notify other Contractors that they
        were unsuccessful.

2.8     Negotiations

2.8.1   Negotiations will include a discussion of the Tender Proposal, the proposed work
        plan, training and any suggestions made by the Contractor to improve the TOR. ZRA
        and the Contractor will then work out the final TOR, training, and bar charts
        indicating activities, periods at the power stations, logistics and reporting. The agreed
        TOR and final work plan will then be incorporated in the description of services and
        form part of the contract. Special attention will be paid to clearly defining the inputs
        required from ZRA to ensure satisfactory implementation of the assignment.

2.8.2   The financial negotiation will include a clarification (if any) of the Contractor’s tax
        liability in Zambia and Zimbabwe, and the manner in which it will be reflected in the
        contract; and will reflect the agreed technical modifications in the cost of the services.

2.9     Confidentiality

2.9.1   Information relating to the evaluation of proposals and recommendations concerning
        awards shall not be disclosed to the Contractors who submitted the Tender Proposals
        or to other persons not officially concerned with the process, until the winning
        Contractor has been notified that it has been awarded the Contract.




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