Standard Technical Features of BTG System for Supercritical 660 ...
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Standard Technical Features of BTG System for Supercritical 660 ...

Standard Technical Features of BTG System for Supercritical 660 ... Standard Technical Features of BTG System for Supercritical 660 ...

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12.07.2015 Views

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsplatforms, stairs & ladders shall be provided in accordance withfollowing requirements:-----------------------------------------------------------------------------------------------------------------------------------DescriptionMinimum clear width*-----------------------------------------------------------------------------------------------------------------------------------a) Main access walkways 1200 mmb) Staircase 1000 mmc) Ladders ** 450 mmd) Platforms 1200 mm------------------------------------------------------------------------------------------------------------------------------------* The clear width indicated shall be without any interruption from theintervening pipes, columns, actuators, instrument enclosures, racks etc.** Ladders shall be provided only in such cases where it is not possibleto provide stairs and except at places where ladders have beenspecifically specified.ii)Platforms shall be provided at all burner levels, all around the furnace,such that there is adequate space for operation, service and maintenanceof all burners and associated auxiliaries. The burner platforms shall beminimum 3000 mm wide and shall extend from furnace walls. Platformsshall allow complete burner withdrawal within boiler enclosure.Platforms at each burner elevation shall be continuous and run at thesame level without any interruptions from intervening steps, obstructionsetc. Burner platforms within 200 mm of an igniter shall be welded steelchequered plate with welded-in-place drains to prevent oil spillage fromspreading.Burner platforms shall have direct access to elevator and access stairs toeach burner level shall also be provided.iii)iv)Platforms of minimum clear width of 1200 mm shall be provided on atleast three sides of the control station/ equipment. The platforms shall beall along the length of soot blower control station, fuel oil controlstation, SH & RH spray control stations, SCAPH control station, steam/water sample coolers, APH lube oil station etc. Access through elevator,staircase and main access walkways for reaching the platforms shall beprovided.Soot blowers shall have platforms on both sides along the entire lengthof retractable soot blowers with adequate space and service area forremoval and handling of rotary blower elements in one piece.All LRSB's shall have minimum 1200 mm wide platforms on both sidesalong the entire length of soot blowers. Platform width should provideadequate space and service area for removal and handling of blowerelements in one piece. Access through elevator/ staircase and mainaccess walkways for reaching the LRSB platforms shall be provided.49

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsv) All manholes, all access doors, all observation ports, all instrumentsincluding flame scanners, flame cameras & ash level indicators, junctionboxes for control and instrumentation, all instrument test/ samplingpoints including that for PADO and all dirty pitot tube & coal samplingpoints shall be accessible from main access walkway/ platforms. In casethe lowest point of the manhole/ access door/ exceeds 800 mm and ofobservation ports/ dirty pitot tube & coal sampling points/ instrumentsexceeds 1200 mm from the nearest walkway/ platforms level thensuitable intermediate platform to each of the above access doors,observation port, sampling points, instruments etc. along with suitableapproach from nearest platform level shall be provided. Minimum heightof the observation port shall be 500 mm from the platform/intermediateplatform.vi)Suitable all round platform of 1000 mm clear width shall be provided formanual operation of all valves, for all dampers, for ash hoppers, APHdrives, for all lubricated equipment bearings and equipments requiringaccess during operation for normal day to day inspection & maintenance.Suitable access to these platforms shall also be provided.vii) All around platforms of clear width of 1000 mm and adequate to permitat least two persons to simultaneously work (1.5 sq.m. minimum) shallalso be provided for all damper actuators, valve actuators, safety valves,instrument source connection point, Y pieces, expansion joints and otherareas requiring access only monthly or annually. Suitable access toabove platforms with walkways, stairs/ ladders etc. shall be provided.viii) Platform should be provided for removal and handling of startup drainre-circulation pump, motor, cooler. Direct access through elevatorswithout use of stairs for reaching the platforms shall be provided.ix)Annular platforms of 1200 mm clear width accessible by stairs/laddersshall be provided for mill discharge valves & bunker outlet gates.x) Continuous platforms of minimum clear width of 1500 mm shall beprovided all around furnace seal trough level. Access to these platformlevels shall be by staircase.xi)Storage PlatformsIn addition to maintenance platforms, walkways etc. specified above,storage platforms shall be provided for storing of scaffoldings, APHbaskets and platforms for removal and handling of economizer andreheater and other maintenance items required during overhaul of steamgenerator(s) in accordance with the following:a) Scaffoldings: Adequate platforms around scaffolding entry point forstoring of maintenance cradle/ quick erected scaffoldings prior tocommencement of maintenance/ overhaul activities. Weight ofmaintenance cradle/quick erected scaffoldings shall be accounted inthe structure and platform design.50

<strong>Standard</strong> <strong>Technical</strong> <strong>Features</strong> <strong>of</strong> <strong>BTG</strong> <strong>System</strong> <strong>for</strong> <strong>Supercritical</strong> <strong>660</strong>/800 MW Thermal Unitsv) All manholes, all access doors, all observation ports, all instrumentsincluding flame scanners, flame cameras & ash level indicators, junctionboxes <strong>for</strong> control and instrumentation, all instrument test/ samplingpoints including that <strong>for</strong> PADO and all dirty pitot tube & coal samplingpoints shall be accessible from main access walkway/ plat<strong>for</strong>ms. In casethe lowest point <strong>of</strong> the manhole/ access door/ exceeds 800 mm and <strong>of</strong>observation ports/ dirty pitot tube & coal sampling points/ instrumentsexceeds 1200 mm from the nearest walkway/ plat<strong>for</strong>ms level thensuitable intermediate plat<strong>for</strong>m to each <strong>of</strong> the above access doors,observation port, sampling points, instruments etc. along with suitableapproach from nearest plat<strong>for</strong>m level shall be provided. Minimum height<strong>of</strong> the observation port shall be 500 mm from the plat<strong>for</strong>m/intermediateplat<strong>for</strong>m.vi)Suitable all round plat<strong>for</strong>m <strong>of</strong> 1000 mm clear width shall be provided <strong>for</strong>manual operation <strong>of</strong> all valves, <strong>for</strong> all dampers, <strong>for</strong> ash hoppers, APHdrives, <strong>for</strong> all lubricated equipment bearings and equipments requiringaccess during operation <strong>for</strong> normal day to day inspection & maintenance.Suitable access to these plat<strong>for</strong>ms shall also be provided.vii) All around plat<strong>for</strong>ms <strong>of</strong> clear width <strong>of</strong> 1000 mm and adequate to permitat least two persons to simultaneously work (1.5 sq.m. minimum) shallalso be provided <strong>for</strong> all damper actuators, valve actuators, safety valves,instrument source connection point, Y pieces, expansion joints and otherareas requiring access only monthly or annually. Suitable access toabove plat<strong>for</strong>ms with walkways, stairs/ ladders etc. shall be provided.viii) Plat<strong>for</strong>m should be provided <strong>for</strong> removal and handling <strong>of</strong> startup drainre-circulation pump, motor, cooler. Direct access through elevatorswithout use <strong>of</strong> stairs <strong>for</strong> reaching the plat<strong>for</strong>ms shall be provided.ix)Annular plat<strong>for</strong>ms <strong>of</strong> 1200 mm clear width accessible by stairs/laddersshall be provided <strong>for</strong> mill discharge valves & bunker outlet gates.x) Continuous plat<strong>for</strong>ms <strong>of</strong> minimum clear width <strong>of</strong> 1500 mm shall beprovided all around furnace seal trough level. Access to these plat<strong>for</strong>mlevels shall be by staircase.xi)Storage Plat<strong>for</strong>msIn addition to maintenance plat<strong>for</strong>ms, walkways etc. specified above,storage plat<strong>for</strong>ms shall be provided <strong>for</strong> storing <strong>of</strong> scaffoldings, APHbaskets and plat<strong>for</strong>ms <strong>for</strong> removal and handling <strong>of</strong> economizer andreheater and other maintenance items required during overhaul <strong>of</strong> steamgenerator(s) in accordance with the following:a) Scaffoldings: Adequate plat<strong>for</strong>ms around scaffolding entry point <strong>for</strong>storing <strong>of</strong> maintenance cradle/ quick erected scaffoldings prior tocommencement <strong>of</strong> maintenance/ overhaul activities. Weight <strong>of</strong>maintenance cradle/quick erected scaffoldings shall be accounted inthe structure and plat<strong>for</strong>m design.50

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