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«F1»
Fax No.: «F2»
Attention : GENERAL
MANAGER
Subject :
CONTRACT NO. 10721026/00
CONSTRUCTION OF POWER
PLANT NO. 10 IN
Pre-Bid Clarification No.
1 (Q1 – Q31)
Gentlemen:
Please find below Saudi Electricity Company (SEC) answers to your
questions. Please consider these clarifications in preparing your bid.
Q1. Volume 1, Schedule “A”, Clause 12.1, Temporary
Structures: We understand that all storage areas and temporary structures of
CONTRACTOR can be constructed in the COMPANY premises. Please confirm whether
our understanding is correct. Also please let us know whether COMPANY premises
shall be provided to the CONTRACTOR free of charge.
A1. PP10 Project is new and there is space available in the proposed
plot for the future extension of the power plant. When the site will be handed
over to the contractor, they can make temporary storage and
other facilities related exclusively to PP10 requirements, during
the project execution. There is no designated area for such facility.
Contractor can choose the location on the basis of their proposed lay
out, having no affect on the work progress.
Q2. Volume 1, ITP/Commercial, Proposal, Clause
15, Documents to be submitted together with bids. Please provide us Appendix I,
II, III and IV as per the tender document.
A2. These
Appendices are not issued to the Bidders together with the Bid Package. Bidders
to provide the statements/list required under Paragraph 15 of the Instructions
to Bidders for Commercial Proposal as appendices to their Commercial Proposals.
Q3. Volume 1,
Schedule “A”, Clause 18 & Schedule “B”, Attachment II, Warranty Period and Operating
Spare Parts: We have difficulty in differentiating between one (1) year period
of warranty and 38 months after contract effective date for Final Acceptance
Date. The end of one (1) year warranty shall trigger the release of Final
Acceptance Certificate and shall relieve the contractor of the responsibility
to supply operating spare parts. However, there will be three (3) months gap
between the completion of one (1) year warranty and FAC, in case of first
1,000MW simple cycle. We kindly request your clarification for the final
objective of contract.
A3. Warranty
Period shall be one [1] year from Preliminary Acceptance Date. Contract
Duration (Contract Effective Date up to the Final Acceptance Date) shall be
thirty-eight [38] Gregorian months. The Contract Effective Date shall be the
same as the date the Contractor signs the Contract. The conditions for Final
Acceptance are as indicated in Paragraph 17.7 (Final Acceptance) of Schedule
"A". There is only one Final Acceptance Date for the Project. Contractor shall provide the
"Start-up Spare Parts" up to Preliminary Acceptance of the Power
Plant Unit. "Operating Spare Parts" to be supplied by Contractor
shall be for use by SEC during operation after the Warranty Period.
Q4. Volume II,
Part 2, Section 3, Clause 3.3.22, Temporary office building for company’s use:
How many engineers/personnel will be resided in 300 square meters? It is required
to define the number of furniture, office equipment, etc.
A4.
Number of Engineers and other
personnel in temporary office building shall be fifty (50).
Q5. Volume II,
Part 2, Section 1.3, Section3, 3.2.1 b),
Topographic Survey, Final grading:
Please kindly provide topographic survey report and
finish ground level required for site preparation from current level.
A5. All Bidders shall perform their own site
survey and soil investigation according to Part-2 Section-3 Clause3.2.2.
Finish
ground level required for the site preparation shall be as per bid requirement
(refer to Part-2 Section-3 Clauses 3.2.2 & 3.2.4, also refer to Part-3
Section-1 Clauses 1.2.2 & 1.2.3).
Q6. Volume II, Part 4, Section-3A, 1.0, Fuel Oil
Pipeline: Bidder is requested to consider approved company by ARAMCO for this
work as mandatory requirement. Pursuant to this requirement, please kindly
provide approved company list by ARAMCO for this work.
A6. Please refer to the attached list.
Q7. Volume II,
Part 9, Section 1, Clause 9, In-factory training: Please kindly define the number of trainee for
in-factory training to estimate all related expenditures as per said Part 9,
Section 1, Clause 9.5.
A7. In pricing schedule, unit rate for such
training is required. Depending upon the type/model of the proposed GTG units,
the number of such trainees shall be discussed and decided during the technical
negotiation stage.
Q8. Volume II,
Part 4, Section 3A, Clause 1.0: Crude oil piping from ARAMCO interface point to the
crude oil storage tanks fuel piping system as required at the
1. Drawings showing the location of ARAMCO
interface point and route from ARAMCO interface point to Riyadh PP10 Power Plant,
as the same are not enclosed in the specification.
2. Fuel pressure and size in the east- west pipe
line at the tap off points.
3. Confirmation
of availability of incoming power supply for electrical & control system
feeding to crude oil main pumps and associated auxiliaries system, if required.
A8. Please find Dwg # BA-247846 attached to this
Pre-Bid Clarification No. 1.
Interface
point from Aramco to PP-10 shall be either at the
Q9. Volume II,
Part 4, Section 3B, Clause 1.0, Fuel gas pipeline & metering station from
ARAMCO interface point to Custody metering station at the
1. Drawing
showing the location of tie-in point of fuel gas pipeline at Saudi
Aramco’s Supply header of east-west
pipeline and route to Custody Transfer metering skid.
2. Pipe size
of the east-west pipe line at Saudi Aramco end.
A9. Please find Dwg # BA-247846 attached to this
Pre-Bid Clarification No. 1.
Location of tie-in point of fuel gas
pipeline shall be at ARAMCO gas pipeline (56”).
Route shall be approved during
design engineering stage.
Pipe
size of east-west pipeline is 56”.
Q10.
NOx, DLN (Part-2, Section-2, General Technical Requirements for Environmental
Aspects, Para 2.2.2, page 2.2.6: As the Gas Turbine is to be designed to burn
Crude Oil, Dry Low NOx (DLN) combustion systems are not available for such
application. SEC has not elected in the
past to reduce NOx emissions by use of water injection technology in diffusion
combustors. Is this still the case or is water injection desired. If water
injection is required, is water available in sufficient quantities? As a follow
up, is SEC aware of the significant resulting impact on inspection /
maintenance intervals?
A10.
It is confirmed that the requirement is for
the Dry Low NOx (DLN) type combustion system. If for any GT model the DLN type
combustion system is not available on crude oil operation then the Bidder can
propose the water injection system as an option. In this case the following should
be categorically specified:
1. Quality and quantity of water required.
2. Impact on inspection and maintenance
intervals.
3. Impact on combustion components if any.
4.
Impact on the GT power output.
Q11. Plant
Altitude Required (Part-2, Section-1, Design Guidelines,
This
information is critical to finalizing the number of GT units required. Please provide
this information.
A11.
All Bidders have already visited the
proposed site. They shall carry out the topographical survey of the site and
make assessment of the site elevation.
Q12.
Indoor Vs Outdoors (Part-1, Section-1, Project Overall Description,
A12.
Indoor configuration is final and no
optional proposal for outdoor configuration is required.
Q13.
Please provide a complete natural gas
analysis (Part-4, Section-1, Mechanical, Fuel Spec) as this is critical for the
design of the plant/equipment.
A13. Fuel analysis for liquid as well as
gas fuel is attached.
Q14. Inlet
Chiller option with the implication on a vertical filter inlet house design
(Part-4, Section-1, Mechanical,
A14. There shall be provision in the
air intake duct for installation of air cooling coils and droplet catchers in
future, without any modification to the filter house and associated duct works.
The filter configuration and the selection of the filter house shall be made on
the basis of this requirement.
Q15.
Compartment
Pressurization vs. Indoor Application (Part-4, Section-1, Mechanical,
A15.
The
specific requirement is for the gas turbine components such as exhaust frame
blowers etc.
Q16. Off
Frequency Operation (Part-4, Section-1, Mechanical, Para 2.3.2.a.ii, Page
4.1.5) The SEC specification states GTs. shall be able to deliver power output
in stable condition within the system frequency range of 57.5 to 62.5Hz without
any significant increase in vibration levels or mechanical stress. While Bidder confirms compliance with the
above, it should be recognized that during under frequency operation, the power
output of the unit will be proportionately reduced. As a result, it is assumed that this
off-frequency operation requirement is not Grid Code related. Grid Codes often require that unit power
output be maintained during under frequency conditions. These Units will not have the capability for
over firing. Please clarify that this
need is not required for Grid Code Requirement compliance.
A16.
Bidder shall comply with what is stated
in the specification.
Q17.
Hydrogen Sulphide Conditions (Part-1,
Section-1, Project Overall Description Para 1.2.4, Page 1.1.1): The SEC
specification states, “The new Power Plant will be located south of Riyadh
close to Al-Kharj Road, at approximately 18-kilometers away from Riyadh
Refinery.” Please clarify if Hydrogen
Sulphide is present in the Atmosphere at the Site. If so, please identify the concentration
level.
A17. During the site visit, location of
the plant was identified. Bidder shall take environmental samples as necessary
for the analysis and assessment of any required data.
Q18.
Training (Part-9, Section-1, Training
Para 9, Page 12): The SEC specification states “COMPANY shall select a number
of COMPANY personnel [engineers/ technicians] from its Operation and
Maintenance staff to be trained In-Factory.”
Please confirm the number of personnel to be trained in Factory.
A18. In pricing
schedule, unit rate for such training is required. Depending upon the
type/model of the proposed GTG units, the number of such trainees shall be
discussed and decided during the technical negotiation stage.
Q19. Spares List (Part-8, Section-1,
Plant Maintainability & Accessibility General Design,
A19. Depending upon
the type and model of the GTG units proposed by the Bidder, it is the
responsibility of Bidder to propose the required strategic spare parts.
Q20. Vol. 2 Part 2: SEC to provide the list of Workshop
Machine Tools, Electrical Tools and Instrument Tools.
A20. Refer
to Part 8 Section1, Plant Maintainability.
Q21. Vol. 2
Part 3, Sec 1: SEC to advise how the rail way will be connected from the GT
hall to the new workshop.
A21. The
railway track shall be laid down between the lay down area of the GT buildings
and the workshop as per the rout shown on the attached plant layout drawing.
Q22. Vol. 2
Part 4, Sec. 1 Clause 1.2.1 Page1, Two heavy duty Cranes in each Turbine Hall:
SEC to define if these two Cranes are required for each G.T. hall or each block
(4 GTs).
A22. Two
heavy duty cranes are required for each turbine hall.
Q23. Vol. 2.
Part4, Sec.2, Clause 1.7.2 Page 8: SEC to define the quantity of treated & untreated crude oil storage
tanks.
A23. As
per clause 1.7.2, the number of treated crude oil tanks shall not be less than
six (6). However, size and number of
untreated crude oil storage tank shall be proposed by the bidder in compliance
with the requirements of fuel treatment system as per SEC requirements
specified in Vol.2 Part 4. Sec 3A.
Q24. Vol.
2 Part 4, Sec. 2, Clause 1.7.2 Page 8, Crude
oil storage tank type is
considered as open
double deck floating roof & no fixed roof. SEC to advise.
A24. Refer
to Vol 2. Part 4, Sec.2 clause 1.7.4, page 8.
Q25. Vol. 2
Part 4 Sec. 2, Clause 3.5 Page 37: Our understanding for simple cycle is that
Wadi raw water will be
transferred by tanks to PP10 site and two water treatment plants & tanks
(softened & drinking) will be provided only. In the second phase, new
tanks, R.O. & Demin. Plants will be provided. Please advise if our
understanding is correct. On the other hand, SEC to define all possible sources
of raw water keeping in mind that if sewage treated water is used, then it will not be used for potable
water.
A25. Bidder
to note that all Demin. water requirements for the proposed Simple Cycle Plant
are to be met in this phase. Combined Cycle will be in the next phase of the
plant. Sewage treated water will not be used for potable water requirements and
provisions for interfacing with municipal water shall be provided in this
Simple Cycle phase of the Power Plant.
Q26. Vol. 2 Part 4, Sec. 3A Clause 1 Page 1, SEC
to provide the Crude Fuel Oil Pipeline, Tie-in
location and the right of way for pipeline.
A26. Please
find Dwg # BA-247846 attached to this Pre-Bid Clarification No. 1.
Interface
point from Aramco to PP-10 shall be either at the
Q27. Vol. 2 Part 4 Sec 3A Page 1, SEC to
provide the Arab light crude analysis for the following constituents:
*Lead
*Potassium
*Calcium
*Hydrogen
Sulfide (H2S)
*Manganese
*Magnesium
*Aluminum
*Silicon
*Iron
*Flash
Point
*Carbon
residual
A27.
Crude oil analysis attached.
Q28. Vol. 2 Part 4, Sec.3B Page 1: SEC to provide the
Fuel Gas analysis.
A28. Gas
fuel analysis attached.
Q29. Vol. 2 Part 4, Sec. 3B Clause 5.2 Page 2, SEC to
provide the Fuel Gas Pipeline route, Tie-in, location and the right of way for
pipeline.
A29. Find
attached Dwg # BA-247846 attached to this Pre-Bid Clarification No. 1.
Location of tie-in point of fuel gas
pipeline shall be at ARAMCO gas pipeline (56”).
Route shall be approved during
design engineering stage.
Pipe
size of east-west pipeline is 56”
Q30. Vol. 2 Part 6, SEC to define the design basis
of the given Fire Water pump capacity 795m3/hr, it seems under sized.
A30. This is only a typical minimum capacity
specified. However the fire protection system and the selection of associated
equipments shall be fully compliant with the SEC requirements specified in the
Industrial Safety and security department instruction No. 0611-004a dated Dec
2005. Copies of the said instructions were handed over to all bidders in the
CD.
Q31. Vol. 2
General, SEC to provide soft copy of all equipment data sheets.
A31. Soft copies for Data Sheets are included in
the CD provided to the bidders.
Moreover, SEC is pleased
to inform you that the Technical Proposal Bid Closing Date has been extended as
follows:
Bid Closing Date : 12 May 2007 (Saturday)
Time :
10:00 A.M.
Place :
All submitted Technical
Proposals and Bid Bonds shall be opened at 10:30 A.M. on the same
date and place indicated above.
Please acknowledge receipt
of this Pre-Bid Clarification by signing on the space provided below, and send
this page back
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Very truly yours, |
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Acknowledge
Receipt:
________________________
Name of
Bidder (Company Name)
________________________
Name in
Print and Signature
________________
Date
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