MID/AN/27

a.) Design, Manufacture, assembling, factory testing, supply, installation, testing and Commissioning [at LIS Ranjan of new raw water (cold river water) complete replacement of bowl assembly] of new bowl assembly for already installed 20 cusecs discharge 61 m Head VT pump (700 T1A6 model of Jyoti make) at LIS Ranjan coupled with 3-phase 6.6kV, 50Hz, 986 rpm (ACW), slip ring, vertical solid shaft, 650HP HT induction motor. The Bowl assembly shall be suitable for following parameters of units installed/ site conditions:- PUMP: - VT pump of capacity (Q) 20 cusecs x 61 m head (H) with three stages having speed of 986 RPM. The pump is to be operated in open sump in parallel with other three pumps of same capacity with minimum submergence of 1.70 mtrs. Forced external clear water lubricated pump at the pressure of 5.0 kg/ sq.cm. the bowl assembly of output 348.84 kW. Column Pipe assembly:- Size 500mm x 200mm x 70mm dia with discharge outlet size of 500mm dia. PRIME MOVER/DRIVER:- Slip ring type Solid shaft , Three phase 650 H.P , 6.6 KV, 50 Hz AC electric induction motor of nominal speed 986 RPM. TYPE OF DUTY WATER: - cold water, silt laden, raw water (fresh raw water) Apart from above described parameters other desired specifications affecting the bowl assembly shall satisfy/coincide the requirement as per installed complete VT pumping unit of Jyoti make model 700 T1A6 and other site conditions. The job includes assembling of bowl assembly with already existing column pipe assembly (shaft enclosing tube and line shaft), forced water lubrication system, discharge head and coupling with electric Prime-mover & providing / fitting in position of nuts/ bolts of sorts as per actual specifications. Testing: - Obtaining of expected field performance curve/ in lab/ shop testing and lab/shop testing at reduced speed and stages shall be according to IS 5120 with revision, if any through CEIL/RITES. Field test shall be carried under actual site conditions to check/ test at specified speed, discharge, delivery head, net pump effective head, and other connected parameter over a specified period with regular observations. The job includes cost of component, labour, carriage to & fro transportation , loading/ unloading, handling, Storage / stacking, connected tools/ tackles, testing, commissioning and required servicing over the warranty period. (Complete job as per parameters/technical specifications and conditions mentioned in SBD). b.) Providing/Installation/Testing and Commissioning of 800 amp Vacuum Circuit Breakers for 485 kW HT motors including safety devices under following scope of work:- SCOPE OF WORK:- The work includes Design, manufacture, assembling, supply, installation, testing and commissioning of outgoing VCB (Vacuum Circuit Breaker) HT panel 6.60 KV±10% of normal current carrying capacity 800 Amp. with short circuit breaking current of 26 KA in 3 seconds for operation of three phase, Slip ring type, low speed , 485 kW HT induction motor; complete dismantling of old installed outgoing HT panels and stacking them at suitable place within premises & also includes other related works required for successful installation, testing and commissioning of new VCB panel. Panel consisting of 01 no. VCB and connected accessories i.e. electrical measuring instruments, C.Ts, P.Ts, Numerical type motor Protection relays, indicators, Bus Bars, insulators etc. (complete). The HT Panel shall be integrated cubical type metal clad, floor mounted, free standing for indoor installation with fully draw-out type breaker carriage and shall comprise of standard pre-fabricated CRCA sheet units assembled (bolted) with integrated base frame at bottom to form a rigid, free standing structure Sheet thickness of various parts 2 mm for front door, Metering chamber & front door VCB chamber, bottom gland plate & base plate -2.5mm. All load bearing sheet thickness should be min. 2.5 mm with protection class IP-X4/IP54. VCB should be of indoor class with 3 pole/Phase, Rated voltage 6.6 kV±10%, Rated insulation level 7.2 kV Rated normal current 800 Amp, Rated short circuit breaking current/ capacity 26 KA/ 300 MVA in 3 secs , Rated operating Sequence 0-0.3sec-CO-3min-CO, consisting of manual cum motor operated spring charged mechanism of stored energy type. In the closed state of breaker, the closing spring can perform the duty operation. Facility should also be available for hand charging the springs in the event of control supply failure, Spring charging motor shall be rated for 230VAC, 50 HZ supply. Electrical anti-pumping feature should also be provided. The VCB shall consist of three air insulated poles incorporating mechanism of interrupters. Power supply for tripping devices of the breaker shall be fed from DC source Power supply for tripping / closing devices of the breaker shall be fed from 110 volt DC source. Master control switch TNC trip, neutral, close switch for VCB control shall be provided. Indicating lamps shall be “Cluster LED” type Lamps having minimum power consumption, Inside the cubicles the wiring for control, signaling, protection and instrument circuit shall be done with PVC insulated conductors. The wiring shall preferably be enclosed in plastic channels or neatly bunched together. The CT wiring shall be minimum 2.5 sq.mm. and other control as well as PT wiring shall be of 1.5 sq.mm. The same shall be of multi-stranded copper. Each wire shall be identified at both ends by PVC ferrule. The instrument transformer such as current and voltage transformer shall be cast resin insulated. The current transformer shall conform to latest edition of IS 2705, while the voltage transformer shall conform to IS 3156. The CT’s and PT’s shall be designed suitably for required metering and protection equipment. The line PT’s shall be single/three pole version. Digital Ammeters shall be provided on each Breaker panel with suitable selector switches of standard make and quality. Digital Voltmeter of PTR 6.6 KV/110 V shall be provided on VCB Panel with suitable selector switch of standard make and quality. All breakers shall be provided with Numerical type motor protection Relays as per the requirement, Over current Relay, Earth fault Relays with IDMT (Inverse Definite Minimum Time) for outgoing feeders and all other such Relays as may be required for the best protection practice shall be supplied by the vendor. All shall be Numerical relays of good quality and manufactured by a renowned manufacturer. The panel is to be installed in alignment and circuit connections of already installed incomer panels, bus bar coupler & auxiliary panels including required modification in bus-bar/ cable connection as per site conditions. Complete job shall be done as per all specifications, parameters and provisions as per the scope of work.