Replacement, Febrication and Erection of Vertical Shutter in old Existing Spillway vent 1and 2 with hoisting arrangements in Gomukhi Dam near Vadakanandhal Village of Chinnasalem Taluk in Kallakurichi District

Amount

Repair and replacement of second stage embedded parts like roller track plate, side seal track and sill seat for spillway gate of vent size 12200x6100mm as per the following specification. The existing corroded MS roller track plate is in two layers. The bottom layer is made of 100x16mm MS flat securely welded to the roller track embedded in concrete. The top layer is made of 100x16mm MS flat and is welded to the bottom layer. This layer shall be removed by grinding and gas cutting operations from the bottom layer. Then a SS track plate of size 90x12mm shall be welded to the existing bottom MS track plate appropriately to enable the rollers move vertically on the SS track plate. This would reduce friction to a large extent. The side seal track plate shall be of size 80x8mm made of SS 304 grade. It shall be appropriately welded to the Existing 100 welded in the upstream side upto 6.50m from sill level. This would facilitate the smooth movement of side seal without friction, while the gate moves up & down. The sill seat shall be made of 80x8mm SS flat of 304 grade. This shall be provided on top of the existing sill beam which is embedded in concrete. This provides an even surface for the bottom seal to land on preventing water from leakage. The existing corroded guide base and guide angle shall be removed. The guide base of size 200x100x32mm shall be fabricated and the edges shall be finished by grinding. 22mm dia holes shall be drilled at a pitch of 110mm in the guide base. Guide plate of size 25x100x8000mm shall be fabricated and the edges finished by grinding. The groove guide shall be fixed in position by marking a center mark in vertical position on the existing guide portion. The holes shall be marked for a pitch of 110mm in vertical intervals of 500mm c/c. The groove guide portion in masontry shall be drilled for 24mm dia and 250mm depth to accommodate the guide base. Anchor rod of 20mm dia and 300mm length shall be fixed using vinyl ester hybrid motor chemical . The guide base plate shall be connected to the anchor bolt at vertical intervals of 500mm. Guide plate of 25mm shall be welded to the center of base plate in vertical position. The straightness shall be ensured using plump level. The cost includes cost of materials, labour charges for dismantling and erection at site, hire charges for machinery like grinding machine, gas cutting equipment, drilling machine, welding plant & generator, rental charges for erection equipments like chain block & crane, cost of consumables such as oil, diesel & lubricants for generator, welding rod, grinding wheel, core cutter bits, oxygen & LPG, incidental charges like conveyance to & fro from site of work, loading & unloading, risk allowance, etc., complete, including maintenance & warranty for 5 years.

Dismantling of existing old corroded vertical gates of vent size 12200x6100mm from its respective groove portion by the following process. The gates shall be made to rest on the sill portion. The counter weight shall be locked to the deck bridge through pin connecting both sides. Lifting chains shall be released from the shutter by removing the pin from the chains. The shutter shall be cut out into pieces with gas cutting equipment. Then the cut pieces shall be carried from vent portion using a crane and then transported to the department store through trucks and stacked as directed by the departmental officers. The cost includes cost of consumables like oxygen gas & LPG, grinding wheels, oil, diesel & lubricants for generator, labour charges for dismantling, lifting, loading, unloading & stacking, hire charges for crane, lorry, machinery like cutting equipment, grinding machine & generator, etc., complete.

Design, fabrication & supply of vertical shutter including skin plate with vertical stiffeners, horizontal fabricated girders, end verticals, rear angle, connecting plates, rib plates, etc, suitable for spillway gate of vent size 12200x6100mm as per IS 4622. The skin plate, end verticals, vertical stiffeners, horizontal fabricated girders, lifting assembly, side seal base plate, side seal cover, bottom seal cover, rear angles shall be made of structural steel confirming to IS 2062 : 2011. The connecting fasteners shall be made of MS confirming to IS 2062. The welding shall be done as per standard procedures and the burr and slag shall be removed by grinding the top of welds. A good weld is as strong as the base metal. A suitable electrode shall be chosen and welded with a good welding equipment and a trained welder. All non – metallic substances shall be removed in the weld joints before commencement of welding. On fabrication of all components of the shutter, a trial assembly shall be done at the shopfloor to ensure the dimensional accuracy and integration of all sub components. Also, the layout shall be clearly marked & serially numbered by punching. Match drilling in different components and cleats provided wherever necessary to assure minimum tolerance levels. The cost includes cost of MS materials, cost of consumables like welding rods, grinding wheels, drill bits, cut off wheels, oxygen & LPG gas, oil, diesel & lubricant for generator, process charges like gas cutting, welding and drilling, hire charges for machinery like gas cutting plant, welding equipment, corecut machine, generator, electric ovens, grinding machine equipments like chain pulley block, crane, labour charges for loading, lifting, unloading, etc., complete and as directed by the departmental officers including maintenance & warranty for 5 years.

Design, fabrication and supply of cast steel roller assembly for Spillway gates of vent size 12200x6100mm as per the following specification. cast roller wheels with stock allowance for machining shall be manufactured as per IS 2707 : grade 1 material. Roller wheels of appropriate size with bearing and retainers shall be machined as per approved drawing. The required tolerance shall be provided for wheel to fix the bearing & retainers. Spherical roller bearing of appropriate size and quality manufactured by reputed firm shall be used in the roller assembly. M10.5 drilling & M12 tapping shall be done in the wheel after machining. The retainer shall be drilled to M13.5 size for fastening to the wheel. The roller pin shall be made of a material conforming to IS 1570-30cr13 grade. The roller pin shall be machined as per the approved drawing. The bearing, retainer plates, pin and oil seals shall be assembled together with the roller as directed by the departmental officers. The cost includes cost of materials like steel, fasteners, grease nipple, bearing, retainer plate, roller and pin, process charges like Pattern, Pattern mounting, steel casting, machining, cylindrical grinding, drilling, tapping, case hardening, assembly, cost of oil, diesel & lubricants for generator, conveyance charges, loading & unloading, etc, complete, including maintenance & warranty for 5 years.

Design, manufacture, supply and erection of bottom seal & side seal with fasteners for a vent size 12200x6100mm as per the following specification. The seals shall be made of a basic polymer that shall be natural rubber. Rubber seals shall be moulded to ensure homogeneous section. Natural rubber seal shall be used as it is elastic, deforms readily and regains its original shape on the removal of loads. The bottom seal shall be a flat seal of size 75x12mm. The side seal shall be a Z type rubber seal of size 74x79x16mm . The center joint seal between the two element connecting shall be provided 170x10mm flat type seal. M 13 holes shall be punched in the rubber seals with seal punchers to match with the holes in the skin plate and cover plate. SS 304 gr fasteners of size M12 shall be used to fasten the rubber seal to the skin plate and cover plate as directed by the departmental officers. The cost includes cost of materials like rubber seal & fasteners, labour charges punching of rubber seal & erection in the shutter, oil, diesel & lubricants for generator, loading & unloading, conveyance charges, etc, complete, including maintenance & warranty for 5 years

Erection, testing & commissioning of vertical lift gate for a vent size 12200x6100mm with structural steel skin plate, horizontal girders, vertical stiffeners, wheels, lifting brackets, etc., complete in all respects as per the technical specification and drawings as directed by the departmental officers. This also includes connection/assembly of hoists with gate for safe, proper and smooth functioning of gates. All steel structures shall be welded appropriately with skilled workmen. The welding shall be done as per standard procedures and the burr and slag shall be removed by grinding the top of welds. A good weld is as strong as the base metal. A suitable electrode shall be chosen and welded with a good welding equipment and a trained welder. All non – metallic substances shall be removed in the weld joints before commencement of welding. All heavy erection equipment like cranes, hoists, chain pulley blocks, winches shall be employed appropriately without damaging the existing structure. Scaffolding shall be done with utmost care taking into consideration the safety of human lives. Temporary barricading/platforms shall be provided in risky operational areas like ogee, etc. The cost includes hirecharges of erection equipments like crane, hoists, winches, machinery such as grinding machine, core cutter, gas cutting plant, welding machine & electric ovens, cost of oil, diesel & lubricants for generator, cost of consumables like oxygen & LPG, welding rods & grinding wheels, cost of erection & dismantling of temporary structures, scaffolding, platforms/barricades, etc., complete.

Conducting the following minimum quality tests as per approved QAP at various stages of work to ensure raw materials and its fabrication are free from defects as per industry standards and maintenance of records at all stages for assurance of quality. Raw materials such as hot rolled plates and sectional structures are tested for physical & chemical properties - one random sample for minimum of 40 tonnes of plate/structural weight. Stainless steel seal seat, wheel track plate shall be tested for physical & chemical properties – one sample (Random) for entire lot of any size. Cast rollers are tested to be free from defects by ultrasonic flaw detector 100% in house as per acceptable standard ASME section VIII witnessed by authorized third party agency. Rubber seals are tested in house for physical properties such as Hardness, Elongation, Tensile strength, Tensile test after ageing, water absorption test as per IS 11855 : 2004. All raw materials are 100% dimensional checked and verified in accordance with manufacturer test certificate. In shop welding process, quality of fillet welds are checked visually and using 100% magnetic particle inspection. In site welding , quality of fillet weld is inspected either by 10% dye penetrant or magnetic particle inspection. For butt welds, 100% ultrasonic inspection is done for skin plate joints. Root weld is inspected by 100% dye penetrant test in butt welds. Internal inspection report shall be furnished at all stages of fabrication. Surface protective treatment such as blast cleaning, epoxy primer and coal tar epoxy coating shall be done as per standard norms. Quality of blast cleaning is ensured by cleanliness to SA 2 ½ finish and profile measured using calibrated surface profile gauge before commencement of blast cleaning & coatings. Adhesion of coating is done with cross hatch & X cut test as per ASTM D 3359. Thickness of primer and coal tar epoxy coatings are ensured by coating thickness gauge at random points. All reports and tests shall be furnished to the appropriate authority as directed by the departmental officers.

Design, procurement, fabrication & supply, erection/ installation of dogging/latch beam including embeddment if any along with construction of niche of adequate size in existing masonry/concrete structure for holding the gate above the MWL for gate maintenance & also to facilitate maintenance /repair or replacement of gate wheels/wheel assembly, including maintenance & warranty for 5 years. This includes scaffolding and incidental petty civil works as directed by the departmental officers.

Design, supply & erection of hydraulic hoist for lifting of vertical gates. The hydraulic hoists consists of a cylinder with upper and lower cylinder head, piston and stem passing through a packing in the lower cylinder head. The hoists are operated by a motor and oil pump arrangement with the directional control by valves which are actuated by electric contacts from any desired position. Manual operating arrangements shall also be provided along with the hydraulic system. The cost includes cost of materials, labour charges transport, scaffolding, installation and maintenance & warranty for 5 years.

Design, drawing, fabrication, transport & installation of an inspection platform for the gomukhi dam additional spillway radial shutters at the following size & specification. The total length of the platform shall be 12000mm and necessary to inspect the shutter trunnion and arms from the downstream side, Also it serves for periodical maintenance operations such as oiling, greasing & painting. This easy & quick access enables to monitor any leakage from the shutter and enables carrying out emergency operations. The platform shall be of width 900mm and shall be supported by the main girder ISMB 400 on either ends of the platform. ISA 50x50x6 shall be welded as intermediate stiffeners singularly between the main girders at distance of 450mm c/c from each other and cross stiffeners at a distance of 500 c/c from each other shall be provided throughout the length of the inspection platform. A gusset plate made of 8mm thick MS plate and size 160 x 200mm shall be perpendicularly welded to the outer side of the main girder on either side to weld the vertical posts of height 1200 mm made of ISA 75x75x6mm. The handrail pipes of dia 25mm made of GI pipes shall be inserted into the holes drilled in the vertical post equidistant from each other as in the drawing. The platform top shall be finished with 6mm composite chequered plate from end to end throughout the platform for a width of 900mm. All joints in the frames shall be neatly welded and ground to give an excellent finish. The foundation bolts of size 16mm with base plate of size 250x250x12mm shall be provided to anchor the platform to the existing pier. Necessary civil works like concreting & anchoring in existing masonry structure shall be included in the scope of this job. The Cost includes cost of materials, labour charges, transport, erection, crane hire charges, power charges from a generator at site, loading & unloading charges, conveyance of machinery to & fro from site of work, hire charges for machinery, scaffolding charges , risk allowance for working at a hazardous location at a height of 15m, maintenance & warranty for 5 years, etc., complete.

Design, drawing, fabrication, transport & installation of a approach staircase to the platform of the following size & specification. The staircase shall descend from the road bridge from an appropriate entry point to the inspection platform with adequate steps & hand rails. This is necessary to inspect vertical gate from the downstream side, Also it serves for periodical maintenance operations such as oiling, greasing & painting. This easy & quick access enables to monitor any leakage from the shutter and enables carrying out emergency operations. The staircase shall be of width 900mm and shall be supported by the main girder ISMC 200 on either ends of the staircase. The tread & the risers shall be of appropriate height & width. A gusset plate made of 8mm thick MS plate and size 160x200mm shall be perpendicularly welded to the cuter side of the main girder on either side to weld the vertical posts of height 1200mm made of ISA 75x75x6mm. The handrail pipes of dia 25mm made of GI pipes shall be inserted into the holes drilled in the vertical post equidistant from each other as in the drawing. The platform top shall be finished with 6mm composite chequered plate from end to end throughout the platform for a width of 900mm. All joints in the frames shall be neatly welded and ground to given an excellent finish. Necessary civil works like concreting & anchoring in existing masonry structure shall be included in the scope of this job. The cost includes cost of materials, labour charges, transport , erection, crane hire charges, power charges from a generator at site, loading & unloading charges conveyance of machinery to & fro from site of work, hire charges for machinery, scaffolding charges, risk allowance for working at a hazardous location at a height of 15m, maintenance & warranty for 5 years etc., complete.

Providing abrasive blast cleaning using air blast cleaning with abrasive aluminium oxide/steel grits/sand as per the following specification. Moisture should not be present on the steel surface during blast cleaning. All, oil, paraffin, grease & dirt shall be removed from the surfaces to be painted primarily before blast cleaning. Then all weld spatter, slag, burrs, loose rust and mill scale and other foreign substances shall be removed by sandblasting. The average surface roughness after sand blasting shall not exceed 35 to 50 µ. Blast cleaning shall confirm to Swedish standard SA 2 1/2 (near white metal). Blast cleaned surfaces showing plate surface defects such as scabs or sharp gouges shall be repaired in an approved manner prior to painting. After blast cleaning, the surface shall be dusted off or blown off with compressed air free of detrimental oil and water. All surfaces to be painted shall be completely dry, clean and free from moisture just prior to and during painting. If rust forms or the surface becomes contaminated in the interval between cleaning and painting, recleaning to the same degree shall be required. All safety precautions like wearing helmets, respirators & grounding of blast hose to dissipate static charges should be adopted as directed by the departmental officers. The cost includes cost all materials, labour charges, hire charges for generator , compressor, hopper, accessories, conveyance of machinery to & fro from site of work, scaffolding charges, consumables like oil & diesel for generator, risk allowance,etc, complete. including maintenance & warranty for 5 years.

Spillway vertical gate

inspection platform

Approach Staircase

Providing metallising on gate/ exposed parts using flame thermal spraying equipment as per the following specification. The metalizing should be applied within four hours of surface preparation of the component structure. Thermal spraying is a cold process and have proven that they provide long term corrosion protection and outperform all other methods. These thermal spray coating provide corrosion protection by excluding the environment and acting as a barrier coating and they also provide sacrificial anodic protection. These coating are typically mechanically bonded to a grit blasted surface. Aluminium wire composition as per ASTM standard B833-09 shall be continuously melted in an gas flame spray gun with 150µ thickness. Droplets of molten metal from the wire shall be deposited onto the steel forming the protective coating and this avoid corrosion for a long term. The process shall be carried out as per ISO 2063- 1991. The cost includes cost of materials, labour charges, hire charges for machinery, incidental charges like conveyance to & fro from site risk allowance etc., complete. including maintenance & warranty for 5 years.

Spillway vertical gate

Application of a high performance primary coating to protect the steel structure from highly abrasive, erosive and corrosive environments. This being a industrial coating, enhances the life of the structure and reduces the strain of continuous maintenance. After surface preparation of the structure, a primer coat with epoxy primer shall be applied. The dry film thickness should be 40-60µ for primer coat. The colour is grey and minimum pot time should be 4 to 8 hours. The mixing ratio of base to accelerator by volume should be according to the manufacturers standard. All paint, when applied, shall provide a satisfactory film and a smooth and even surface. Paint shall be thoroughly stirred, strained, and kept at the uniform consistency during application. Paint shall not be applied when the temperature of the metal or surrounding air is below 10 degree Celsius and that of the metal is above 50 degrees Celsius, or when the humidity is above 90 percent, or when it threatens to rain before the painted coat gets dry. Primer coat shall be protected during the initial curing period against the possibility of moisture condensation or contamination with foreign matter. All painting works shall be performed by airless spraying. When the coating material is applied by spraying, suitable means shall be provided to prevent segregation during the coating operation. Free oil and moisture shall be removed from the air supply lines of all spraying equipment. Primer coat shall be uniform and free from runs, slag and other imperfections. The time between successive coats shall be not less than the minimum nor more than the maximum re-coating time specified by the paint manufacturer. The paint shall be applied so that the thickness at any point is not less than that stipulated in the approved painting specifications. Surface not required to be coated, but adjacent to surfaces which are to be cleaned and coated, shall be adequately protected during cleaning and coating. Repairs to damaged areas of the coating shall be carried out strictly in accordance with the approved painting specifications. Because of the flammable and toxic nature of the coating materials, precautions should be taken to eliminate any health or safety hazard that may arise during the application of the coating. Smoking and welding shall not be allowed within 10 meters of the place when painting is in progress. The painting to the gates, hoists and other parts shall be done as per IS specification No.14177-1994. Guidelines for painting system for Hydraulic Gates and hoists and its Adjuncts Viz., IS: 1477 (Part I) – 1971, IS : 1477 (part II) -1971. The cost includes cost of primer & thinner, labour charges for application of primer, hire charges for compressor, generator & airless spray gun with its accessories, cost of oil, diesel & lubricant for generator, scaffolding charges, conveyance of machinery & tools to and fro from site of work, risk allowance, etc, complete, including maintenance & warranty for 5 years.

Spillway vertical gate

inspection platform

Approach Staircase

Application of coaltar epoxy over the primer shall be through airless spray method. The colour shall be black and the mixing ratio of base to accelerator should be by manufacturer standards. The dry film thickness should be between 125-150 µ per coat. The interval before over coating shall be 24 hours. All paint, when applied, shall provide a satisfactory film and a smooth and even surface. Paint shall be thoroughly stirred, strained, and kept at the uniform consistency during application. Paint shall not be applied when the temperature of the metal or surrounding air is below 10 degree Celsius and that of the metal is above 50 degrees Celsius, or when the humidity is above 90 percent, or when it threatens to rain before the painted coat gets dry. Each coat shall be protected during the initial curing period against the possibility of moisture condensation or contamination with foreign matter. All painting works shall be performed by airless spraying. When the coating material is applied by spraying, suitable means shall be provided to prevent segregation during the coating operation. Free oil and moisture shall be removed from the air supply lines of all spraying equipment. Each coat shall be uniform and free from runs, sags and other imperfections. The time between successive coats shall be not less than the minimum nor more than the maximum re-coating time specified by the paint manufacturer. The paint shall be applied so that the thickness at any point is not less than that stipulated in the approved painting specifications. Surface not required to be coated, but adjacent to surfaces which are to be cleaned and coated, shall be adequately protected during cleaning and coating. Repairs to damaged areas of the coating shall be carried out strictly in accordance with the approved painting specifications. Because of the flammable and toxic nature of the coating materials, precautions should be taken to eliminate any health or safety hazard that may arise during the application of the coating. Smoking and welding shall not be allowed within 10 meters of the place when painting is in progress. The painting to the gates, hoists and other parts shall be done as per IS specification No.14177-1994. The colour of the paint coat when applied is generally black but turns into brown over a period time. However, the properties of the paint remain intact assuring the performance. Guidelines for painting system for Hydraulic Gates and hoists and its Adjuncts Viz., IS: 1477 (Part I) – 1971, IS : 1477 (part II) – 1971. The cost includes cost of coaltar epoxy paint, thinner, etc, labour charges for its application, hire charges for compressor, generator, airless spray machine with its accessories , cost of oil, diesel & lubricant for generator, scaffolding charges, conveyance of machinery & tools to and fro from site of work, risk allowance, etc, complete, including maintenance & warranty for 5 years.

Spillway vertical gate

inspection platform

Approach Staircase

Replacement of Z type seal as per IS 11855:2004 at sides of the shutters as per the following specification. The old seal cover plate shall be dismantled from the skin plate after removal of the rusted bolts & nuts by gascutting. The skin plate surface shall be neatly cleaned by grinding. Now, the existing seal seat cover made of 65x10mm MS flat shall be cleaned & painted. The rubber seal shall be now matched with the existing holes in the skin plate and then holes should be punched accordingly to align with that in the skin plate. The rubber seal of size 74x79x16mmshall be placed on the skin plate over which the seal seat cover shall be placed and fastened with CSK SS bolts/hex bolt. The cost includes cost of materials, labour charges, transport, erection, hire charges for machinery, incidental charges like conveyance to & fro from site etc., complete

Replacement of Musical note rubber seal as per IS 11855:2004 at top & sides of the shutters as per the following specification. The old seal cover plate shall be dismantled from the skin plate after removal of the rusted bolts & nuts by gascutting. The skin plate surface shall be neatly cleaned by grinding. Now, the existing seal seat cover made of 65x10mm MS flat shall be cleaned & painted. The rubber seal shall be now matched with the existing holes in the skin plate and then holes should be punched accordingly to align with that in the skin plate. The rubber seal of size 100mmx44mmx14mmØ shall be placed on the skin plate over which the seal seat cover shall be placed and fastened with CSK SS bolts/hex bolt. The cost includes cost of materials, labour charges, transport, erection, hire charges for machinery, incidental charges like conveyance to & fro from site etc., complete.

Repair and Replacement of bottom rubber seal of the shutter as per the following specification. The old rubber seal shall be removed from the skin plate after removal of the rusted bolts & nuts by gascutting equipments. The seal seat cover shall be removed along with the rubber seal. The skin plate & seal seat cover surface shall be neatly cleaned on either side by grinding. Now, the existing seal seat cover made of 100x10mm MS flat & the new rubber seal shall be now matched with the existing holes in the skin plate and then holes shall be drilled in the seal seat cover to align with that in the skin plate, if necessary. 18mm holes shall be punched accordingly in the rubber seal of size 100x12mm. The inside surface of the seal seat cover is given a coat of anticorrosive zinc rich primer over which two coats of coal tar epoxy shall be applied at an interval of 24 hours between each coat. Now the rubber seal shall be placed on the skin plate over which the seal seat cover shall be placed and fastened with SS bolts & nuts of size M16x75. The cost includes cost all of materials, labour charges, transport, erection, hire charges for machinery, incidental charges like conveyance to & fro from site, etc., complete and as directed by departmental officers.

Special Repairs to the River sluice shutter as per the following specification. The existing platform shall be opened and the existing shutter of size 2200x1980mm shall be lifted with chain pulley block. The shutter shall be rendered immovable with the chain pulley block and the pin shall be removed from the lifting plate. The released suspension channel shall be lifted and kept separately for reuse. The shutter shall then again lifted and rested in the resting platform. The wheels in the shutter shall be now removed and brought to factory for service. The wheels shall be openedup and existing bearings shall be removed and cleaned. The wheel surface shall be machined true to required size so that it shall operate smoothly without vibration and without undergoing undue drift. The wheel shall be cleaned of all dirt, dust, corrosion and then the bushes shall be fixed inside the wheels. Then the wheels shall be fixed to the shutter at appropriate place. The shutter shall then be cleaned of corrosive particles and then a coat of coal tar epoxy is applied over a coat of primer as directed by the departmental officers. Then the shutter is lowered to the sill level and the suspension channel is refixed to the lifting plate with the pin. The suspension channel shall also be cleaned of corrosive particles and a coat of coal tar epoxy shall be applied over a coat of primer. The screw rod shall then be connected to the suspension channel and trial operation is conducted. The cost includes cost of all materials, process charges like gas cutting, welding, machining, scaffolding charges, labour charges for dismantling, loading, lifting, unloading, transport, erection, labour charges for equipments like crane, chain pulley block, power charges from generator, risk allowance for working at a depth of more than 3m, conveyance to site and clearing them after completion of work including cost of trial operation, maintenance & warranty for 5 years except protective coating , etc., complete and as directed by the departmental officers.

Overhauling of existing hoisting arrangements for the shutter as per the following specification. The existing hoist covers shall be opened up and stored separately for reuse. The top cover of plummer blocks connecting the existing transmission shafts shall be opened and old grease shall be removed. Then, the existing bearings shall be cleaned with liquid cleaner and inspected for mis-alignment and breakage. Fresh grease shall be applied to the plummer block and top cover closed with requisite fasteners. The shaft shall be checked for its alignment and redone to ensure straightness of shaft. The existing gear wheels shall be cleaned of dried grease and dust manually. The reduction gearbox shall now be drained of old used lubricant thro the drain hole at the bottom. Now, the liquid cleaner shall be poured in the gearbox and the inside surface and gears are thoroughly cleaned and then the contaminated liquid cleaner shall be drained. The drain hole shall be plugged and fresh lubricant of appropriate grade shall be filled to the level as indicated by the department officers. The available rope drum or the chain & chain sprocket mechanism in the hoisting system shall be manually cleaned of dried grease and dirt and appropriate lubricant shall be applied. The whole arrangements shall be tested & passed after a set of trial operation. The cost includes cost of inspection, spares, lubricants, transport charges, charges for dismantling & erection, etc, complete.

Providing new safety ladder arrangements to the Road bridge to spillway shutter slice level as per the following specification. The main stiles at both ends shall be 450mm apart and made up of 50x8mm MS Flat. They shall be connected in between with treads of size 16mm dia MS rod. This tread shall be welded to the stiles on either side. The treads shall be spaced onebelow the other at a distance 300mm equidistant from each other. The bottom of the ladder shall be buried in concrete. The top of the ladder shall be welded to the operating head platform. All members shall be given a coat of redoxide and then two coats of aluminium oxide is given. The old unusable ladder shall be removed and stacked at stores for disposal as directed by the departmental officers. The cost includes cost of materials, labour, erection, transport, warranty for 5 years except protective coatings, etc, complete.

GST 18% IN FIGURES