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

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsb) APH baskets: Adequate platforms with proper approach nearAPH(s) for storage of at least 40 nos. baskets for each APH. Weightof stored APH baskets shall be accounted in the structure andplatform design.c) Economizer, superheater and rerheater: Platforms for handling of atleast 3 rows of largest size coils and storage of at least 8 rows oflargest size coils of economizer, superheater and reheater (allhorizontal heating surfaces in second pass) coils shall be provided.Adequate platforms, walkways, access/stairs shall also be providedfor removal of second pass water walls/casing, buckstays andinstallation of monorails, hoist etc. Weight of above coils andequipments required for handling shall be accounted in the structureand platform design.xii) It shall be ensured that the layout and routing of pulverized coal (PC)pipes is such that horizontal sections of PC pipes & bends are accessiblefrom the nearest platform or walkway level, to the extent possible, tofacilitate their replacement during maintenance.xiii) Access to all penthouse cooling doors shall be provided throughmaintenance walkways of minimum 1000mm width.xiv) Walkways/ platforms/ staircase etc. shall comply with followingrequirements also:a) Platforms at same elevation on each side of steam generator shallhave a walkway connecting the two sides.b) Platforms requiring access from the elevator shall extend to theelevator entrance by main access walkways and be attached to theelevator steel as required.c) Minimum headroom (free height) under all floors, walkways andstairs shall be 2.2m. The interconnection between two platforms/floors at different elevations shall be through proper staircase.Ladders shall be considered only in exceptional case whereprovision of staircase is not possible.d) Hand railings shall be provided for all walkways, platforms,openings, staircases etc.e) If material is stacked or stored on a platform or walkway, or near afloor opening, kick plate/ toe guard must be increased in height orsolid or mesh panels of appropriate height must be installed toprevent the material from falling.51
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsf) All areas subject to lube oil or chemical spills will be provided withcurbs and drains.xv) Two main stairways shall be provided one on each side of the steamgenerator. One stairway shall extend continuously from grade to thehighest operating level and the other shall extend continuously fromgrade to the boiler roof. Steel framing for penthouses for each stairwayshall be provided. The portion of main stairway within the enclosedportion of the building, if any, shall be designed for one hour smoke/ fireproof requirements.6.5.12 ElevatorsElevators shall be designed based on following criteria:i) Type of service One (1) no. passenger-elevator in TG hall andone (1) no passenger cum goods elevator inii) Design/ construction/installation codesboiler area per unit.a) Latest edition of IS: 14655 (all parts) andalso meeting any additional requirements ofIS: 4666, IS: 1860 and IS: 3534.b) Any other equivalent codeiii) Load carrying capacity 1088 kg (equivalent to 16 person) forpassenger elevator & 3000 kg for passengercum goods elevator.iv) Rated speed 0.55 m/sec for 3000 kg capacity elevator and1.0 m/sec for 1088 kg capacity elevator.v) Total travel As per steam generator supplier'srecommendations.vi) Number of floors to be Ten (minimum).servedvii) Entrances Twelve (12) (minimum) (all on same side).viii) Entrance and platformsizeAs per design/ installation codes at (ii) above.ix) Elevator landings (min.) a) Ground floor.b) Mezzanine floor of TG hall.c) Main operating floor of TG hall.d) All burner platforms.e) Alternate soot blower levels.f) Coal gallery.g) Steam separator.h) At all regularly operating platforms.i) Laboratory floor.52
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