SPECIAL REPAIR/REPLACEMENT OF 2X500 KVA DG SETS AGAINST BER AT AIR FORCE STATION THOISE

Amount

Excavation in trenches in hard/dense soil not exceeding 1.5 metre wide and not exceeding 1.5 metre deep for laying of cables and foundation of poles etc. and getting out, complete all as specified and directed.

Returning, filling in trenches (soil), including spreading, leveling and well ramming in layers not exceeding 25 cm thick, complete all as specified and directed.

Removal of surplus excavated soil to a distance not exceeding 50 metre and depositing where directed at a level not exceeding 1.5metre above the starting point, complete all as specified and directed.

Material and labour, sand cushioning with a layer of dry river sand, 80mm thick before laying of cable and 150mm thick (punned down to 100mm thick) after laying of cables, in trenches/ducts, complete all as specified and directed. Note : Punned down thickness (overall 18cm), shall be considered for measurement and payment.

Supplying and laying, factory made unreinforced precast concrete cable cover LV type-1, flat, of size 250x150x40mm,ISI marked, laid flat and dry in trenches over the cable for protection, length perpendicular to the direction of cable adjacent to each other, including taking out old and removal, complete all as specified and directed.

Supply, laying, jointing, testing and commissioning of Low Tension (LT) XLPE insulated, armoured, heavy duty, electric power cable, cross sectional area 500 Sqmm 3.5 core aluminum conductor 1100volts grade ISI marked underground cable including both side connection with cable lugs etc, laid in trenches, along poles or passing through pipes or laid under floor or through walls etc, including taking out old and removal, complete all as specified and as directed. Note(s): (i) Excavation & earth work, sand cushioning and PCC cover for protection of cable shall be measured and paid separately.

Earthing complete with copper plate electrode of size 60cm×60cm ×3.15mm thick burried directly in ground vertically to a depth not less than 2.5 mtr below the ground level with top edge of earth plate at a depth not less than 1.5 mtr below ground level. Earth plate surrounded by 15mm thick packed alternative layers of charcoal dust and comman salt, earth 20×3mm copper strip by means of bolts , nuts, check nuts and washers of galvanised iron with thimbles. The other end of copper strip wire is connected to main switch board and protected by light grade GI pipe of 15 mm bore. provision of 20mm bore light grade GI pipe for watering including GI funnel and wire mesh. Pipe shall be provided vertically upto top level of earth pit and then taken horizontally to the earth pit. Cement concrete chamber of PCC ( 1:3:6 ) type C-2using 40 mm graded stone aggregate.The chamber shall be constructed one metre away from edge of earth pit. 50 mm thick pre cast cover of cement concrete (1:2:4) type B-1 using 20 mm graded stone aggregate and MS angle iron 50 x 50 x 6 mm frame including two coats of synthetic enamel paint over a coat of red oxide primer to exposed steel surfaces. excavation in soft / loose soil, returning filling and removal of surplus soil to a distance of 50 metre as directed and shown in Electrical Plate No- 3 of SSR Part-1 (2009) including dismantling old earthing complete all as specified and as directed.

Supply, installation ,testing, commissioning of 'Silent type' with continuous operation diesel generating set alongwith having prime power rating of 400 kW/500 KVA at NTP, 415 Volt, 75 db noise level at 1 mtr distance from DG Set with suitable Engine to develop 500 KVA, AC 415 Volt at 1500RPM , 0.8 lagging power factor at 415 volts suitable for 50 hz 3 phase system and ,confirming to CPCB-IV norms / latest CPCB emission norms , acoustic enclosure, anti vibration mountings, control panel and foundation. The DG set should be robust in construction factory tested and assembled to ensure perfect alignment of Engine and Alternator on a common base frame with same manufacturer. The DG set shall be comprising of following item as under: The DG set shall be comprising of following item as under: -

(a) Diesel Engine : The diesel engine shall be of four stroke cycle multi-cylinder, direct injection, water cooled, turbo charged , Air to air after cooling and optimised turbocharger for increased altitude capabilities, developing suitable BHP @ 1500 RPM under tropical condition of Thoise of BS 5514/ISO 3046 with an over load capacity of 110% for one hour in any specified 12 hrs of continuous operation, The engine shall confirm to IS:10000/BS:649/BS 5514.The engine shall have the following accessories: - (i) Cooling fan and radiator. (ii) DM water cooling systems with pre-mix anti-corrosive additive. (iii) Turbocharger. (iv) Fly wheel with fly wheel housing. (v) Electrical engine starter motor (disengagement after start-up) with Batteries. (vi) Battery charging systems. (vii) Stainless steel exhaust flexible elbow. (viii) Thermal sealing of exhaust pipe and aluminium cladding for complete exhaust pipe and silencer. (ix) Required filters for fuel, lube oil, air etc. (x) Sets of flexible hoses as required. (xi) Suitable rubber coupling to Alternator with guard. (xii) Suitable Engine controller for protection of the engine. (xiii) Coolant heater and crancase heater. (xiv) Oil drain Pump. (xv) Heavy duty air cleaner etc. Make of Engine:- Kirloskar/Cummins/Greaves

(b) Engine protections: (i) High coolant temperature warning & trip (ii) Low lubricating oil pressure warning & trip (iii) Low coolant level warning & trip (iv) Fail to crank trip (v) Over crank trip (vi) High and Low speed trip (vii) Low or High battery voltage alarms. (viii) Clogged filter warning (ix) Lack of fuel (x) High Canopy Temperature (xi) Set fail to start protection after failure of the set to start after successful three consecutive start attempts.

(c) Governor: The governor shall be of electronic type suitable for monitoring constant engine speed within the specified limits for auto parallel and auto load sharing operation.

(d) Exhaust : The exhaust piping system shall be supplied with a hospital grade silencer and catalytic converter suitably optimized to meet stringent noise emission standards laid down by MoEF / CPCB-IV compliant. The exhaust piping and the silencer shall be wrapped with rock wool and/or calcium silicate. The outside shall be neatly wrapped with aluminum cladding. The exhaust line shall be extended beyond the height of the utility building roof as required by pollution control norms. Suitable supporting structure for installation shall be provided.

(e) Hot air exhaust (Radiator cooling): As per OEM recommendation if sufficient exhaust for radiator is not available , the contractor has to provide GI duct for hot air exhaust from DG set up to designated place of duct outlet. The duct shall be made of 14 Gauge thick GI Sheet including necessary civil work.

(f) Fuel Tank : Inbuilt/internal bottom mounted (with-in DG set or with-in base frame) diesel tank of suitable capacity with mounting brackets, complete with fuel inlet, out let, air vent, drain plug, level indicator, inter connection pipes from tank to diesel generator as required. Suitable barrier shall be provided between Diesel tank and the Engine. Fuel tank shall be fabricated as per tropical condition of Thoise with approx. capacity or designed capacity shall be suitable for 8 hrs continuous operation or 14 hours capacity at 75% load. In case the inbuilt base frame tank is not capable to hold POL for 8 Hrs continuous operation, contractor shall provide additional tank made up of MS Sheet capacity separately as per manufacture recommendation work.

(g) Starting system :The engine starting shall be by means of totally enclosed axial type electric starter suitable for12/ 24 volts DC starting system comprising of starter motor, voltage regulator and arrangement for initial excitation complete with suitable number of batteries as Per OEM Specification ,Sealed Maintenance Free (SMF) Lead-Acid type suitable for HAA Thoise .The battery shall be supplied with a suitable floor mounted MS stand treated with seven tank treatment, two coats of red oxide /primer & acid resistant paint with wooden base, adaptor box etc . with copper conductor battery leads of required length and socket/clamps

(h ) Alternator: (i) 500 KVA 3 phase 0.8 PF 415V, 4 wire 1500 rpm self-excited and self regulated through electronic AVR confirming to IS :4722/BS 2613 suitable for tropical condition with brush less exciter, housed in screen protected drip proof enclosure. The alternator shall be confirming to IS 13364 Part-2 & IS 15999 Part-1/ IEC 60034 Part-1 capable of delivering rated output at rated power factor of 0.8, with a Terminal voltage differing from the rated value by not more than +/- 5%. (ii). Frequency differing from the rated value by not more than +/-0.5%. (iii). Short circuit capacity of 300% for 10 seconds. (iv). Over load capacity of 110% for one hour. The insulation class of the Alternator shall be class F/ H. The temperature rise shall be limited to class B and Ingresses enclosure protection shall IP23 or better. The out put terminals of each Alternator shall be connected to an MCCB of suitable capacity micro processor based 50 KA, 415 Volt adjustable type through a cable system. The control Panel shall be housed inside the acoustic enclosure. Make of alternator :- Stamford/Kirloskar electric/Jyoti/Cummins Electric/Crompton Greaves

(j) Alternator Protection: Alternator should have following protections: - (i) Over and Under voltage (ii) Under and Over frequency warning and trip (iii) Loss of excitation (iv) Over current and Earth Fault and Short Circuit Protection (v) Unbalanced loads (vi) Restricted Earth Fault Protection. (vii) Differential protection. (viii) Diode Failure.

(k) Voltage regulator: A rapid response voltage regulator shall be provided to regulate the generated voltage. The overall regulations from no load to full load, including cold to hot variation and load power factor of 0.8 lag to unity shall be within 2% of the normal voltage. The excitation system shall be designed to promote rapid voltage recovery following sudden application and disconnection of load.

(l) Acoustic enclosure : The acoustic enclosure should be supplied along with DG set from the manufacturer outlet itself as per latest CPCB norm. Acoustic enclosure shall be of powder coated and fabricated out CRCA MS sheet. The canopy shall have hinged doors, one door with glass window to view proper parameters on the control panel. The canopy and doors shall have inside lining of fire retardant foam/glass wool as acoustic materials. The base frame shall be fabricated in ISMC channel or in sheet metal, with lifting hooks for convenient lifting of complete set i.e. along with canopy, engine and alternator. The sound level shall have less than 75 db (A) at a distance of 1 meter. High quality noise absorbent and fire-retardant grade acoustic Insulation material (P.U. Foam) complying to IS 8183. The allowable temperature raise inside the canopy is 5 to 7 deg. Centigrade. The Measurement of noise should be as per ISO 3744/ ISO 8528 (Part 10) standard. The canopy has the provision of emergency push button, external to the canopy. Note : The acoustic enclosure shall be made by the OEM of original engine Manufacturer.

Note : (i) Cost of DG set foundation is deemed to be included in cost of item.(ii) Contractor should submit necessary drawing to GE/Engr-in-Charge before placing the order for approval. (iii) The Gen set must be affixed with label meeting the following requirement (The label shall be durable and legible) (a) Name and address of the engine manufacturer. (b)Certificate that the engine conforms to the CPCB IV emission/ latest CPCB emission norms shall be provided (c) Type and approval certificate number. (d) Date of manufacturing of Gen set. (iv) The complete DG Set including Engine / Alternator shall be factory assembled by manufactured or its authorizes OEM as approved for assembling of the DG set. A certificate in this connection shall be submitted to the GE. (v) Anything missed out above but technically required for efficient working of DG set at Thoise AF Station is deemed to be including in quoted rates. (vi) The quoted rate shall be deemed to be inclusive of first fill of engine oil (vii) The quoted rate shall be deemed to be inclusive of minimum 12 hours test run at site as specified in PS in presence of IEM/ rep of accepting officer, all testing arrangements / equipments for water load test/ suitable strip heater load shall be made available by the contractor for tests. POL shall be arranged by contractor for testing and cost deemed to be included in quoted rate. (x) The contractor shall arrange load / resistive load / water load for testing for final testing of DG set at site and the cost is deemed to be included in quoted rate. (xi) DG set should be sound proof as per latest policy/ latest CPCB Norms. (xii) Drawing for Plinth of DG Set shall be provided by OEM and approved by GE. Further the PCC foundation shall be made by the contractor and quoted rate is deemed to be included this provision. (Xiii) The DG set shall be suitable for operation in high altitude and in extreme climatic conditions ( temperature dropping upto -20° C during winter) prevalent in Thoise, Ladakh.

Note : Schedule of credit for Rs. 30400.00 to be deducted on acceptance of bid.

KHAJURIA ENGINEERS (BID ID -3121788)

national engineering (BID ID -3121523)

M/S ZAHOOR AHMAD KHAN (BID ID -3121592)

NARINDER KUMAR SONS (BID ID -3121520)

DIVYA ELECTRIC CORPOORATION (BID ID -3116341)

Vijaypower Generators Limited (BID ID -3122168)

singh traders (BID ID -3120928)