BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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6.3.2 DESIGN CRITERIAThe steel structure shall be designed in accordance with the following criteria.(1) Load due to the tension of conductor and wire.- 230 kV bus and outgoing conductor : 900 kg per conductor- Overhead grounding wire : 450 kg per wire(2) Vertical loadsThe weight of the conductors, grounding wires, insulator strings and steelstructures shall be taken into consideration.(3) Human Loads120 kg at the centre of the beam.(4) Wind loadsWind loads shall be calculated with wind speed of 100 miles / hr, but the windloads on unit projected area shall not be less than the followings:- On conductors and grounding wires :125 Kg/sq.m- On insulators and other circular section :130 Kg/sq.m- On lattice structures or beam structure :230 Kg/sq.m(5) Seismic Coefficient (Horizontal) : 0.10 g6) Working ConditionsThe normal working condition for various loads shall be deemed to worksimultaneously. The wind direction shall be classified into transverse, longitudinaland oblique components to the line route and the largest load acting on the lineshall be taken as the design stress of the component material.(7) Combination loadsThe Contractor shall calculate the maximum and minimum stresses at anycombination of loading conditions. The design of each type of steel structure shallbe made by the same manner of analysis. The design stresses of individualcomponents shall be largest value of maximum stresses in the respective loadingconditions.(8) Safety FactorsThe safety factors shall not be less than two (2) under the normal workingconditions.(9) Minimum Thickness and Size of Steel MembersMinimum thickness and size of steel members shall be as follows:a. Formed steel : not less than 45 x 45 x 4 mmb. Plate : not less than 4 mm thick.(10) Slenderness RatioGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)66
The slenderness ratio shall not exceed 120 for main members, 200 for bracingand 250 for other members.6.3.3 REQUIREMENTS FOR DESIGN AND CONSTRUCTION(1) WorkmanshipWorkmanship shall be first class throughout. All pieces shall be straight, true todetailed drawings and free from lamination, flaws and other defects. All clippings,back nuts, grindings, bends, holes, etc. shall be true to detailed drawings and freeof burrs.(2) GalvanisingThe steel structure shall be completely galvanised (Hot-Deep), except for partwhich shall be embedded in concrete foundation. All ferrous materials shall begalvanised to meet the requirements of IEC .(3) Materials of Steel StructureAll materials shall be hot rolled structural steel and or high strength structuralsteel.(4) MarkingAll products shall be marked with systematic numbers and / or colours forconvenience of assembly.(5) Future Extension of StructureIn designing the steel structure, consideration shall be given in the design criteriato permit easy extension of steel structure in the future and same loadingconditions shall be taken into account in accordance with the Specifications.(6) Bolts and NutsAll the members shall be connected by bolts and nuts. The diameter of theconnection bolts and step bolts shall not be less than 16 mm.6.3.4 DESIGN ITEMSThe Contractor shall submit to the Board for approval design sheets and drawingsincluding calculation of Loads, selection of constitution and members, selection ofconnecting bolts and calculation of reaction load against base concrete.6.3.5 ACCESSORIESThe following accessories shall be provided, but not be limited.a. Anchor bolts and nuts : One (1) lotb. Gauge plate for anchor bolt : For (4) of each kindc. U-hook bolts and nuts : one (1) lotd. Grounding terminals : one (1) lote. Step-bolts : one (1) lotf. “Roval” paint for repair : Five (5) Kgg. Phase identification plates : one (1) loth. Other necessary accessories, if any : one (1) lotGhorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)67
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Volume - 2Technical RequirementsSec
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GHORASAL 200 MW to 300 MW GAS TURBI
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2. Scope Of Work2.0 Scope of work2.
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3. Generator switchgeara. Outdoor e
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Rated frequency: 50 HzRated nominal
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Lighting impulseWithstand voltage(1
Page 15 and 16: h. One (1) Lot Control and instrume
Page 17 and 18: 2.13 TestsThe Contractor shall be r
Page 19 and 20: Section 3Power Plant ArrangementGho
Page 21 and 22: 3.0 Power Plant Arrangement3.1 Gene
Page 23 and 24: 3.3.2.4 Compressor Wet Washing Syst
Page 26 and 27: The distillate fuel oil system shal
Page 28 and 29: 6. Sump tankThe sump tank allows dr
Page 30 and 31: provide necessary protection for ma
Page 32 and 33: 4. Generator And Ancillary Equipmen
Page 34 and 35: 4.1.4 Temperature RiseThe temperatu
Page 36 and 37: 4.1.12 Accessoriesa. Temperature de
Page 38 and 39: - Secondary wiring including cable
Page 40 and 41: 4.3.6 Voltage TransformerThe voltag
Page 42 and 43: 3) The rated service voltage shall
Page 44 and 45: Section 5TransformersGhorasal 200 M
Page 46 and 47: 5. TRANSFORMERS5.1 GENERALThe trans
Page 48 and 49: . The tank shall be of the welded s
Page 50 and 51: The wiring shall be connected at th
Page 52 and 53: 5.3 UNIT AUXILIARY TRANSFORMER5.3.1
Page 54 and 55: h. Anchor devicei. Oil preservation
Page 56 and 57: 6. 230 kV OUTDOOR SWITCHGEAR, EQUIP
Page 58 and 59: -Power frequency withstand voltage(
Page 60 and 61: eaker.(6) Dielectric Test Voltagea.
Page 62 and 63: . Rated insulation level- Lighting
Page 64 and 65: f. Unless otherwise specified, the
Page 68 and 69: 6.4 INSULATORS AND WIRING MATERIALS
Page 70 and 71: Section 76.6 Kv SwitchgearAndLow Te
Page 72 and 73: 7. 6.6 kV SWITCHGEAR AND LOW TENSIO
Page 74 and 75: - Number of circuit :Determined by
Page 76 and 77: Section 8Control And ProtectionGhor
Page 78 and 79: 8. CONTROL AND PROTECTION EQUIPMENT
Page 80 and 81: - Automatic synchronising equipment
Page 82 and 83: ee. AVR failure xff. Emergency Trip
Page 84 and 85: can be seen through the window with
Page 86 and 87: Required no. of 6.6 kV and 415 V vo
Page 88 and 89: 8.10.3 CONTROL EQUIPMENT(1) Transmi
Page 90 and 91: The test block shall be of the back
Page 92 and 93: Section 9Cabling And GroundingGhora
Page 94 and 95: 9. CABLING AND GROUNDING9.1 GENERAL
Page 96 and 97: 9.2.4 CONTROL AND INSTRUMENT CABLES
Page 98 and 99: 9.4 CABLE ERECTIONConcrete lined ca
Page 100 and 101: Section 10DC Power Supply SystemGho
Page 102 and 103: 10 DC POWER SUPPLY SYSTEM10.1 BATTE
Page 104 and 105: float charge as well as boost charg
Page 106 and 107: Section 11Lighting And Small Power
Page 108 and 109: 11. LIGHTING AND SMALL POWER SUPPLY
Page 110 and 111: (ii)Three phase plug socketOutdoor-
Page 112 and 113: Section 12Fuel Handling FacilitiesG
Page 114 and 115: 12. FUEL OIL SYSTEM AND HANDLING FA
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from unloading base to the fuel tan
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13. FIRE PROTECTION FACILITIES13.1
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System of lock off to (but not exit
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Section 14Communication FacilitiesG
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14. COMMUNICATION FACILITIES14.1 GE
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(2) General CommunicationWhen the o
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(1) BatteryType of batteryCapacityN
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15. MAINTENANCE FACILITIESPage15.1
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15.1.4 RATINGThe rating of the cran
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The main power supply shall have a
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Static tests of all automatic seque
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Section 16Tests And InspectionsGhor
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16 TESTS AND INSPECTIONS16.1 GENERA
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subjected to the following tests by
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c. Stranded Conductors for Overhead
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days from the receipt of the said n
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circuit of unit motor control centr
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Special measures may have to be tak
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Checks shall be made of the local a
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Section 17Civil WorksGhorasal 200 M
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17.9 Sewage Works17.9.1 General17.9
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17.1.4 SITE LABORATORYThe Contracto
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where directed by the Board extra s
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approval regarding the re-measureme
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igidly in position down to the lowe
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on piles together with the apparatu
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than 15 cm in size containing suita
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aggregates shall be washed prior to
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17.6.13 FORMWORK AND TIMBERINGFormw
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he Contractor shall repair at his o
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Sieve designationPercentage by(Squa
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(b) Transverse Joints: The transver
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17.7.2 Gravel SurfacingThe Contract
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extended with sufficient number of
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A written record of the drilling in
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) Control EquipmentThe control equi
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17.12.2 GatesSliding metal gates of
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18 Building WORKS18.1 General18.1.1
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18.1.4 RecordsThe Contractor shall
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FrameRoofExterior wallPartition wal
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18.5 Materials And Workmanship18.5.
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(7) PaintPrior to delivery after sh
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oof cladding shall be less than 1.1
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. Wooden doorsPlywood for panelThic
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The terrazzo is to be trowelled to
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to suit. Stud shall be formed of ap
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Section 19Spare PartsGhorasal 200 M
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19. SPARE PARTS19.1 GENERALThe Cont
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BACKGROUND INFORMATION:Bangladesh P
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- Overhauling of all electrical mot
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3. BASIS OF PRICE3.1 Basis of price
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the delayed services or such other
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13. GENERAL CLAUSES CONCERNING TERM
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17. INSURANCEThe insurance includin
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Appendixes20.1 Site Layout20.2 Grid
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BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

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