Tender Document Volume - 2 - BPDB

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3.3.2 Gas Turbine And Auxiliaries The gas turbine generating unit shall be of the simple cycle heavy-duty industrial packaged type suitable for outdoor installation and operation under the site conditions as specified in Clause B1 of schedule-B. Vibration Critical Speed The radial amplitude of vibration of any rotating shaft under steady state conditions at normal operating speed shall not exceed the value specified in API Standard 616 when measured at the shaft local to the bearing. The critical speed shall be beyond ± 20 % of the operating speed of the engine. All compartments in the gas turbine generating unit shall be accessible for inspection and maintenance. The gas turbine unit shall be designed to burn Liquid fuel as well as natural gas as specified. The unit shall be capable of frequent starts and stops without damage to the hot gas path components and shall be able to run for base load. 3.3.2.1 Starting System The gas turbine shall have electric motor driven starting equipment capable of sustaining the complete starting cycle. The starting motor shall be capable of carrying out at least Five (5) consecutive starting without any harmful effect. 3.3.2.2 Turning Gear A rotor turning gear shall be provided to minimise thermal distortion of the rotor after operation and to permit rapid reloading of the unit after a shutdown. Necessary oil piping and appurtenances shall be included. Turning gear oil piping system shall be a part of the turbine lubrication system and shall be complete with all necessary pressure switches or other interlocks to prevent turning gear operation if lubricating oil pressure drops below than pre-set value. Suitable housing and safety guard shall be provided for all moving parts of the turning gear. Turning gear operation shall be indicated on the remote control panels. The turning gear shall have automatic engaging and disengaging mechanisms. Additional arrangement for hand turning shall be provided for use in case the automatic turning system fails to operate. 3.3.2.3 Load Gear and Accessories Drive Gear The turbine shall be equipped with good quality and suitable load gear equipment of proper rating if required to match the generator speed for 50 Hz generation. Load gear shall be totally enclosed and be equipped with forced lubricating device to the gear. The turbine shall also be equipped with suitable accessories driven gear unit. Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3) 22
3.3.2.4 Compressor Wet Washing System 1. System Descriptions The compressor wet washing system (On & Off line) shall basically comprise of wash water tank with accessories, detergent hopper, interconnecting piping & valves, spray water manifold and spray nozzles. The various components of the system are shown in schematic diagram enclosed. Wash water tank shall be used to draw and mix wash water and detergent to the required dilution, compressed air taken from existing instrument air header shall be used to pressurise this fluid and to forward to the spray water manifold. The spray nozzles shall make a high velocity jet spray to clean the compressor blades while the rotor shall be kept in spinning operation. i) Wash water tank shall be a cylindrical pressure vessel with dished ends on both sides. This tank shall be provided with necessary appurtenances and accessories such as a) Compressed air inlet. b) Water inlet with isolation valve and inlet strainer. c) Breather vent with isolation valve. d) Drain line with isolation valve. e) Detergent inlet nozzle with isolation valve. f) Pressurised water outlet with isolation valve. g) Level gauge glass with isolation valves. h) Hand holes with covers. i) Pressure relief valves. j) Pressure gauge connection. ii) iii) iv) Detergent hopper to hold the detergent for every wash cycle. Interconnecting piping between wash water tank and compressor spray system. This line shall be provided with strainer, drain valve, pressure gauge, and orifice plate. Water wash manifolds. This manifold shall be located within the compressor inlet and it shall distribute the wash water into the compressor inlet air stream. The manifold shall be equipped with a drain valve. v) Set of spray nozzles shall effectively spray water I detergent water for efficient cleaning. To introduce the above-mentioned wet washing system for compressor cleaning of gas turbine generating unit. The following works shall be reformed: a) Installation of the wash water system. b) Providing spray nozzle on compressor inlet manifolds. c) Taking a tapping from instrument compressed air header to supply compressed air for washing system. d) Routing the wash water to the Gas Turbine Compressor. Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3) 23
Page 1 and 2: BANGLADESH POWER DEVELOPMENT BOARD
Page 3 and 4: Section 1 Description of The Projec
Page 5 and 6: Section 2 Scope Of Work Ghorasal 20
Page 7 and 8: 2.0 Scope of Work. The work stated
Page 9 and 10: e. Lubrication system integral with
Page 11 and 12: the following features : Type : SF6
Page 13 and 14: Rated high voltage Rated high volta
Page 15 and 16: c. One (1) lot 41 5 V common power
Page 17 and 18: supervisor(s) shall not be responsi
Page 19 and 20: Section 3 Power Plant Arrangement G
Page 21: 3.0 Power Plant Arrangement 3.1 Gen
Page 25 and 26: The unit shall not trip with voltag
Page 27 and 28: -One fuel pressure regulating valve
Page 29 and 30: Brief technical specification: a) O
Page 31 and 32: Section 4 Generator And Ancillary E
Page 33 and 34: 4. Generator and Ancillary Equipmen
Page 35 and 36: The neutral and output ends of each
Page 37 and 38: 4.2.2 Automatic Voltage Regulator (
Page 39 and 40: (5) Control circuit isolating conne
Page 41 and 42: - End terminal :One(1) lot - Ammete
Page 43 and 44: 2) Incoming Circuit Breaker Cubicle
Page 45 and 46: 5. TRANSFORMERS 5.1 General 5.1.1 R
Page 47 and 48: (peak) a. 230 KV CIRCUIT - lightnin
Page 49 and 50: - 11 KV bushings :75 kV peak The cr
Page 51 and 52: 5.2.4 WINDING AND INSULATION The fu
Page 53 and 54: Non segregated bus duct between low
Page 55 and 56: Section-6 230 KV Switchgear Ghorasa
Page 57 and 58: 6. 230 kV OUTDOOR SWITCHGEAR, EQUIP
Page 59 and 60: to phase voltage. g. Integrating ti
Page 61 and 62: c. The porcelain insulator shall be
Page 63 and 64: 6.2.4 230 kV CURRENT TRENSFORMERS (
Page 65 and 66: (6) Requirements for Design and Con
Page 67 and 68: The slenderness ratio shall not exc
Page 69 and 70: smooth so that interconnecting part
Page 71 and 72: 7. 6.6 kV SWITCHGEAR AND LOW TENSIO
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Each compartment shall have removab
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Feeder circuit : 450, 200 or 100 A
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Page 8. CONTROL AND PROTECTION EQUI
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The unit shall have its own local u
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1. Exhaust temperature high: 1st st
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The following remote indications sh
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e limited to: One (1) lot Overall d
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NPSH availability is critical, at e
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All solenoids shall have class F in
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unit step up transformer control pa
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9.1 General 9.2 Cable Types 9.2.1 2
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The single or triplex core 6.6 kV X
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(1) The cable shall be stranded ann
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Ground grid shall be mesh type and
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10. DC POWER SUPPLY SYSTEM Page 10.
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atteries shall not be less than fol
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With the battery connected and with
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11. LIGHTING AND SMALL POWER SUPPLY
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c. The size shall be adequate to li
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The boxes to be concealed in the co
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12. FUEL HANDLING FACILITIES Page 1
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12.2 Liquid Fuel Handling system Th
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Section 13 Fire Protection Faciliti
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13. FIRE PROTECTION FACILITIES 13.1
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The fire fighting water mains shall
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COMMUNICATION FACILITIES 14.1 Gener
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Operator intrusion into an establis
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Protection for the amplifier shall
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Section 15 Maintenance Facilities 1
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15.1 Over head Electric Crane 15.1.
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(1) Bridge and End Truck Frames The
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Automatic reset, totally enclosed,
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e used. The tools and appliances wi
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16.1 General 16.2 Workshop Test 16.
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. Bench testing of all accessories
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The test shall be performed in acco
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up to six months. (2) Scope of Test
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The following test shall be carried
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f. Sample test reports or data shee
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c. Ratio and HV magnetizating curre
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equipment is provided to replace th
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17.1.2 Topographic Surveys 17.1.3 S
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epeated in the others. 17.1.1 GENER
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The Contractor shall be responsible
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The maximum dry density (MDD) for t
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transport. All concrete, reinforcem
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The concrete shall be transported a
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If any pile is in any Fay unsatisfa
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Column, slab, drain-channel, beam,
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17.6.10 PLACING The concrete shall
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a. -Variation from vertical: In the
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or other internationally accepted m
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(vi) Slab reinforcement The slab re
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The Contractor shall repair at his
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The laying of each length of drain
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One deep-well pump shall be install
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(6) Data to be Submitted with Bids
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Flanges Foundation bolts Other nece
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Section 18 Building Works 18 Buildi
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The General Conditions, Tender Draw
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submission. As described elsewhere
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All rooms shall be provided proper
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Surfaces to be welded shall be free
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18.5.2 Concrete The specifications
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(1) Timber All timber shall be of b
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(1) General The metal works will in
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Glazed ceramic wall tiles shall be
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All joinery, metal works to be pain
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Page 19.1 General Spares during War
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GUIDE LINE For Provision for expert
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A. Category of Experts required: -M
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other BOP equipment / machinery (fu
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any damage part of the equipment or
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10.7 If as a consequence of force m
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c) 10% payment of the relevant serv
Page 223 and 224:
Section 20 Appendixes [Data/ drawin
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Tender Document Volume - 2 - BPDB

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