APH ESP DUCT DAMPER WORK

Amount

Work of APH Maintenance

Opening of all the access doors of APH HE &CE for inspection & execution of the work & closing them after completion of work byapplying hold it & replacing old asbestos rope with new one.

Providing temporary scaffolding at HE/CE for inspection & execution of works and removal of the same after completion of work.

Servicing of lub oil system of Guide /Support Bearing of APH. One job includes one lub oil system of Guide / Support bearing of APH.

Servicing of Rotor drive unit of APH. One job includes one drive of APH.

Revisioning / replacement & resetting of HE / CE inboard, interm & outboard radial seals of APH

Revisioning / replacement & resetting of Bypass seals of APH - Cold End

Revisioning / replacement & resetting of Bypass seals of APH - Hot End

Revisioning / replacement & resetting of Axial seals of APH - Hot End

Revisioning / replacement & resetting of Axial seals of APH - Cold End

Revisioning / replacement & resetting of Rotor Post seals of APH - Hot End

Revisioning / replacement & resetting of Rotor Post seals of APH - Cold End

Repairing / replacement of seal ring segment of APH - Hot End

Repairing / replacement of seal ring segment of APH - Cold End

Repairing / replacement of Static seal plate of APH - Hot End

Repairing / replacement of Static seal plate of APH - Cold End

Servicing of air motor of APH

Alignment of rotor drive unit with electric/ air motor of APH

Servicing / repairing of single nozzle cleaning device & checking of its travel of APH

Cleaning of APH heating element in situ cond. with the help of water/ air jet

Replacement / repairing of eroded / damaged bracing pipes of APH

Repairing of expansion joints / strengthen of old welding of duct from flue gas /air inlet damper to Flue gas /air outlet dampers of APH.

Revisioning /repairing of air seal housing of APH

Repairing of manholes of APH

Repairing of eroded casing of APHs.

Checking of fire fighting /water washing pipe & replacement /blanking of eroded nozzles of APH Hot End. It also includes the removal of chocking of the pipe & patching over eroded portion.

Checking of fire fighting /water washing pipe & replacement /blanking of eroded nozzles of APH Cold End. It also includes the removal of chocking of the pipe & patching over eroded portion.

Replacement of oil seals of the drive shaft of the rotor drive unit of APHs

Removal of scrap material from ash hopper of APH

Reclamation/Repairing/Conversion of worn out basket of APH.Hot End & Intermediate.

Fabrication & erection of plate forms /structures for facilitating the various running and breakdown maintenance works of Air pre-heaters.

Replacement/Repairing / adjustment of adjuster bolt of axial seal plate / Radial sector plate of APH

Fixing of Sealing bar & Sealing strip over hot end baskets of APH

Straightening & repairing of bent diaphragm of APH

Replacement/Repairing of eroded 'T' Bar of APH

Servicing of GV/NRV/Plate valve associated with APH and its auxiliaries

Removal of choking of Ash Hoppers of APH

Removal of Ash accumulated over the space in between the rotor shell and APH outer body shell.

Alignment of rotor level of APH

Rectification of bulged/damaged rotor shell segment and alignment of pin rack of APH

Servicing/Replacement of gear box , counterweight & related accessories of single nozzle cleaning device of APH

Servicing/Replacement of lub oil pump of Guide / Support bearing of APH.

Modification in air heater water washing line of APH (HE/CE)/Lube oil lines

Replacement /repairing of damaged rotor angle /bypass angle of APH

Replacement/repairing of fluid coupling of main drive motor and gear box of APH

Servicing of gate and damper sealing blowers of PA/SA/Flue Gas including its duct

Dismantling and lowering of APH hoist trolley from its position and after completion of work, lift it & assemble it to the same position.

water Washing and Cage repairing of APH Basket which are taken out during O/H of Unit 7

Duct and Dampers

Servicing/ Revisioning of Primary air/secondary air dampers before / after APH, SCAPH I/O damper and flue gas damper after APH.

Maintenance of gates of flue gas inlet to APH, ESP inlet and ESP outlet

Local operation of flue gas inlet gate, ESP inlet /Outlet gate.

Fabrication of flue gas distribution flap to APH outlet

Repairing/ replacement of Eroded Flaps of Flue Gas, Primary and Secondary Air Dampers.

Repairing/ replacement of Eroded Stainless Steel Shafts of By-Plane Dampers.

Cleaning of Aerofoil of Secondary Air duct to Wind Box

Checking and repairing of S.S. Coal Nozzle Tip, Splitter plate of Coal Nozzle Assbly./ air compartment assbly/ oil compartment assbly. from inside the Furnace (In- situ) and application of refractory if found damaged at Splitter plate.

Inspection of Boiler Drum Internals and rectification of defects observed. D.P. Testing of shell joints to check for any crack and its repair by H.P. welding, when only 10 Nos. Turbo Separators are taken out/ replacement of manhole gasket and its tightening to ensure zero leakage.

Servicing of Spring Hanger supports, Hydraulic supports, Anchors & restraints of Boiler Piping & Ducts and resetting on cold set values.

Repairing of Flue Gas/ Primary/ Secondary air Ducts by providing M.S./ carbon steel plates over eroded portion and welding with suitable electrode.

Repairing of metallic expansion joints before/after APH and wind box .

Repairing of non metallic expansion joints befor and after ESP.

Welding of various ducts to arrest leakage of Air/ Flue Gas.

Repairing/ replacement of bracing of Flue Gas up to ID fan inlet ad Secondary air Ducts from APH outlet to wind box.

Servicing of Scanner Air Fan.

Fabrication and erection of Temporary Structures at different Floors of 500 MW Boilers

ESP Maintenance

Cleaning of complete structure, electrodes, shock bar, rapping mechanism & hoppers from inside of ESP of one field by wire brush, hard broom and old cloth.

Removal of scrap, debris and ash from ESP ash hoppers.

Cleaning & Removal of ash/ dust from support insulator by fine cloth.

Repairing of bent collecting electrodes in ESP chamber in fix position.

Removal of damaged emitting electrode and fixing the new emitting electrode.

Servicing/ Repairing / Replacement of rapping hammer in ESP chamber.

Repairing / Replacement of shock bar by cutting huck bolts, removal from the collecting electrodes and re fixing the same on shock bar after repairing of shock bar its alignment to have equal gap on both sides in ESP chamber.

Repairing/ Re fixing of deflector plates on gas distribution screen.

Repairing of eroded portion by welding in ash hopper, ESP roof and other places inside and outside of the ESP chamber.

Repairing/ Re erection of new ash deflector plate as per size from M.S. plate of appropriate thickness with the help of gas cutting and welding.

Inspection and checking of ESP field and removal of minor defects.

Replacement of asbestos rope of ESP hopper manhole, casing manhole and top manhole

Changing of damaged support Insulator.

Repairing of support insulator screen pipe inside the ESP chamber.

Alignment of disturbed emitting structure by opening all the cover plates of support structure. Lifting the emitting structure about 50 mm after loosing all the nuts of the structure suspension rod and then restoring the cover plates and loosened nuts after alignment.

Replacement of plane bearing of rapping mechanism.

Repairing / Replacement of shock bar guide (front/ rear) and shock bar guide attachment by welding or grinding wherever required.

Repairing / Replacement of pin wheel of emitting electrode rapping mechanism.

Fixing of” U” clamp/ “U” guide by welding on collecting electrodes at appropriate places.

Servicing / Replacement of vertical shaft bearing of emitting electrodes raping mechanism & alignment of vertical shaft.

Re fixing of „U‟ guide / „U‟ clamp by welding on collecting electrode plate.

Changing of damaged Shaft Insulator.

Cleaning and Removal of ash /dust from shaft Insulator by fine cloth.

Repairing of bracings between ESP inlet gate and GD Screen and rear side of ESP by providing patch at eroded area or changing new piece by bracing pipe as per size.

Replacement/ Repairing of CERM shaft.

Replacement/ Repairing of GDRM shaft.

Replacement/ Repairing of EERM shaft.

Repairing of emitting frame by patch welding.

Fabrication/ Repairing of EERM manhole.

Fabrication/ Repairing of casing manhole of ESP.

Repairing/ Replacement of shock pads.

Replacement of primary/ secondary screen of GDRM.

Repairing/ Re fabrication of support of duct plate at ESP inlet.

Replacement of asbestos rope of ESP shaft insulators cover.

Replacement/re-erection of damaged double gear boxes of motor of EERM.

Replacement/re-erection of damaged double gear boxes of motor of CERM/GDRM.

Repairing of damaged rapping gear box.

Servicing of rapping gear box coupling bearing block.

Repairing of outer arms-I.

Repairing of outer arms -II for ESP.

Repairing of Pin Wheel arrangement –I of ESP.

Repairing of Pin Wheel arrangement –II of ESP.

Repairing/ Reclamation of Grip Coupling of EERM of ESP.

Repairing of Shaft Insulators attachments of EERM of ESP.

external cleaning of Boiler unit No. 6 & 7 Both

Cleaning of stairs and railing of boiler '0 meter to 9.35' Meter from S1L-S1R(First raw of boiler column) to S21L-S21R

Cleaning of complete boiler '9.35 to 18.65' Meter floors from S1L-S1R(First raw of boiler column) to S21L-S21R including stairs ,railing & interconnecting gallery from TG floor.

Cleaning of complete Boiler area ‘18.65 to 27.25’ Meter floors including interconnecting gallery from TG floor,stairs,railings , all oil skids & fuel oil (HFO/LDO) station.

Cleaning of complete Boiler area ‘27.25 to 36.7’ Meter floors including stairs,railings,interconnecting gallery from TG floor, all oil skids & fuel oil (HFO/LDO) station .

Cleaning of complete Boiler area ‘ 36.7 to 46.20’ Meter floors including stairs,railings, all oil skids & fuel oil (HFO/LDO) station .

Cleaning of complete Boiler area ‘46.20 to 55.35’ Meter floors including stairs,railings.

Cleaning of complete Boiler area ‘55.35 to 64.8’ Meter floors including stairs,railings.

Cleaning of complete Boiler area ‘64.8 to 74.5’ Meter floors including stairs,railings.

Cleaning of complete Boiler area ‘74.5 to 80.71’ Meter floors including stairs,railings.

Cleaning of 80 nos.of fuel inlet elbows & coal gates near burner blocks at 21.00 to 46.00 Mtr

Outside Cleaning of ducts connecting APH outlet to Wind box .

Cleaning of various plate form , stairs, hand railings, structure for gas ducts connecting APH outlet to ESP’S inlet.

Cleaning of ducts connecting APH outlet to ESP’S inlet and ESP outlet to ID fan inlet gate.

Cleaning of RH/SH station, APH soot blowing staion & SCAPH station at various elevation.

Cleaning of boiler soot blower station, CBD staion,& all vent station at various elevation.

Cleaning of one No. Boiler during night (06 PM to 06 AM) of 2x500 M.W.

Removal of Ash from Guide bearing area of A.P.H.

Cleaning of boiler inside sheeting, window glasses, drain pot & drain pipe and observation doors.

Collection of garbage of boiler area and disposal of same at least 1-2 km away from chimney or area specified by Engineer- in- Charge

S. S. ENGINEERING AND CO