“Salient Technical Features of the equipment/system/services covered in the IFB No. 40034538 dated 16.02.2015 for Document No. CS-9591-110-2 is mentioned below. These salient Technical Features are mentioned only to facilitate the prospective bidders to prima-facie understand the requirements under the tender and shall not in any way limit or alter the scope of work and technical features/specification of the equipment/ systems/services covered in the Bidding documents. Detailed provisions in regard of scope of work and technical features/specification of equipment/systems/services, obtained in the Bidding Documents shall be final and binding.”
A Brief Scope of Work
The scope includes design, manufacture, engineering, inspection, testing, packing, forwarding to site, unloading, erection, supervision, pre-commissioning, testing, commissioning and performance testing of two (02) nos steam turbine generator units along with auxiliaries of the type and rating specified. Each unit shall include but not be limited to the following:
Steam turbine generator sets complete with lube oil and control oil system, unit and central oil purification system, turbine gland sealing system, turbine integral and other miscellaneous piping, generator seal oil system, generator stator water cooling system, generator rotor cooling system, water cooled condenser, condenser air evacuation system, condenser on load tube cleaning system, 3x50% condensate extraction pumps, feed heating plant with minimum seven regenerative feed heaters including deaerating feed water heater with storage tank, 2x50% Turbine driven Boiler feed pumps and 1x30% motor driven Boiler Feed Pump with variable speed fluid coupling, HP & LP steam bypass system, EOT crane, power cycle piping, equipment cooling water system, condensate polishing plant (CPU), unit air receivers for compressed air system & compressed air piping around TG building, elevators for TG hall and service building, hoists, air conditioning and ventilation system, temporary elevator for TG hall, control and instrumentation for STG Integral systems & TG-BOP Auxiliaries, generator bus duct and associated equipment, LT switchgear & LT bus duct, solar PV plant on roof tops of buildings, cables & cabling, Geotechnical investigation, civil, structural, architectural works for main plant building, service building, pipe/cable/ duct supporting structures in TG area, CPU regeneration facilities, area paving & other equipment foundations including earthing mats & raisers in TG area, PORTA cabin, foundations for TG, TDBFP & MDBFP with or without vibration isolation system as per option, civil works for air conditioning and ventilation system, infrastructure works such as approach roads, drains, water supply, sewerage, rainwater harvesting, commissioning and performance testing of equipment under bidder’s scope of work, first fill and one year topping requirement of consumables/chemicals, supply of special maintenance tools and tackles, erection materials and consumables, mandatory spares etc.
B Major Technical Features
1.00.00 Steam Turbine
1.01.00 Type
The steam turbine shall be tandem compound, single reheat, regenerative, condensing, multicylinder design with separate HP, separate IP and separate LP casing(s) OR combined HP-IP and separate LP casing(s), directly coupled with generator suitable for indoor installation.
1.02.00 Rating
The steam turbine generator unit shall conform to the following design and duty conditions:
1.03.00 Other Features
(a.) Turbine shall be capable of operating continuously with valves wide open (V.W.O.) to swallow 105% of EMCR steam flow to the turbine at rated main steam and reheat steam parameters. The steam turbine generator shall also be capable of delivering at generator terminals at least 105% of rated output (Guaranteed Output) without any constraints with all the valve wide open, rated steam condition and condenser pressure of 77 mm Hg (abs) & 0% makeup.
(b.) The employer intends to provide a steam generator for each unit having Boiler maximum continuous rating (BMCR) of 102% of the turbine VWO steam flow requirement subject to a minimum of 2580 Tonnes/hr.
(c.) The steam turbine cycle shall consists of minimum three numbers of HP heaters with extraction for top HP heater from HP turbine, one number of deaerator and minimum 3 numbers of LP heaters and shall be suitable for satisfactory operation under tropical conditions.
2.00.00 Generator
2.01.00 Type
Three phase, horizontal mounted, indoor installed, two-pole, class F winding insulation, Stator water/Hydrogen cooled, cylindrical hydrogen cooled rotor type.
2.02.00 Rating
Generator and its excitation system shall have a capability at least matching the declared maximum continuous rated output of the associated steam turbine (for the secondary cooling water temperature of 39 deg C) at all power factors between 0.85 lagging and 0.95 leading with +3% to -5% frequency variation, terminal voltage variation of +/- 5% and combined voltage & frequency variation of 5%. It shall be ensured that when the Generator is working at this capability and cooling water temperature is 39 deg C, no part of the Generator shall attain a temperature in excess of the temperature limits specified for class 130(B) insulation as per IEC-60034.
2.03.00 Also the generator and its excitation system shall be capable of continuous stable operation without any excessive temperature rise at the peak output of the associated steam turbine under VWO & HP heater out condition, etc. as available for the secondary cooling water temperature of 39 deg. C, at all power factors between 0.85 lagging and 0.95 leading with +3% to -5% frequency variation, terminal voltage variation of +/- 5% and combined voltage & frequency variation of 5%. Temperature of different parts may exceed those permissible for class B insulation under such operating conditions, but shall be lower than those permissible for class 155(F) insulation as per IEC-60034.
2.04.00 Rated Parameters
1. |
Power Factor - |
0.85 (lagging) |
2. |
Terminal voltage - |
In the 18 to 24 KV range |
3. |
Frequency - |
50 Hz |
4. |
Speed - |
3000 rpm |
5. |
Short circuit ratio - |
Not less than 0.48 (without negative tolerance) |
3.00.00 GENERATOR BUSDUCTS & NEUTRAL GROUNDING EQUIPMENTS:
a) |
Type |
Isolated phase, continuous self cooled, pressurized type |
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b) |
Service |
Indoor/ Outdoor |
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c) |
No. of phases |
3 |
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d) |
Frequency |
50 Hz |
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e) |
Neutral grounding |
Non-effectively grounded |
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f) |
Rated max. Voltage(r.m.s) |
27 / 38 kV (ANSI 37.23) |
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f) |
Insulation level |
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i) 1 min. dry power frequency withstand |
60/ 80 kV |
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ii) 10-sec dew power frequency withstand |
60/ 80 kV |
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iii) Impulse withstand (1.2/50 micro second wave) |
125/ 150 kV (peak) |
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g) |
Rating |
Continuous Current (Amps) |
Symmetrical S.C. rms (KA) |
Momentary Peak (KA) |
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i) Main run |
26,000 |
As Per Tender SLD |
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ii) Delta run |
15,000 |
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iii) Tap-off for UT, VT & SP Cubicle, NG cubicle & Excitation Transformer. |
2,250 |
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4.00.00 Detail technical features of the equipments/systems covered under this package have been elaborated in the respective chapters of the technical specification.