BOILER /ESP SUPPORTING STRUCTURE
Boiler/ESP ( Electrostatic Precipitator) support structure shall be designed for 1. Dead load 2. live /
imposed loads 3. Static and Dynamic loads for piping , rotating equipment etc. 4. Cable trays and
walkways supported on columns. 5. Ash water piping support 6. ESP hopper ash filled up condition
to the extent of top of the hopper . 7. To calculate the load the ash density to be taken 1350 kg/ m3
8. Ash load at the bottom of hopper and pent house as specified in the mechanical contract. 9. Wind
load and seismic load . 10. Temperature load ( +/- 25 c ) for atmospheric temperature variations. 11.
Temperature load for variation of temperature due to ESP operating conditions.
Boiler structure should be so designed that temperature of the structure should not go beyond 60 deg.
Bracing for pipe supports on ESP should be less than 10.0 Mtr height.
Plinth level of Boiler area will be 500mm higher than FGL ( Finished Grade Level).
Finished floor level of boiler area paving shall be kept about 200 mm lower than the finished floor
level of Main Plant buildings.
Foundation System General requirements are -
A. Foundations can be open ( isolated footing /raft) or pile foundation depending on soil report.
B. The design of foundations should be as per different IS codes.
C. No Major foundations should be on filled up soil.
D. Open foundations and pile foundations should not be combined in same structure.
E. Foundations should be designed on worst combination of loads.
F. For open foundations minimum width is 1.0 M and depth is 1.0M below NGL.
G. Permissible settlement of open foundation of 6.0 M and below span is 40mm
Permissible settlement of open foundation of 6.0 M and span(raft) is 75mm
Permissible settlement on weathering rock is 12mm.
H. For pile foundations the diameter of pile shall be 600mm diameter minimum . Vertical compression load will be 140MT. The uplift and lateral load capacity will be 20% and 5% respectively.
I. Initial Pile Load test to be carried out for each diameter.
Vertical (Compression) - 3
Lateral (Horizontal) - 3
Uplift (Tension) - 3
MAIN PLANT AND AUXILIARY PLANT BUILDING AND STRUCTURES.
-Main plant building shall consist of TG bay, De aerator bay, service
- Air compressor building
- Ash water pump house building.
-Air washing Building.
-Ash Slurry Pump House
-AC Plant Equipment Building
-Air handling Unit.
-CPU regeneration Unit.
- Fire water tank and Pump House Building.
- D.G Set.
- Compressor House Building.
- ESP control Room and VFD Room ( if required.)
- RCC twin compartment Potable overhead tank capacity 50 M3.
CHIMNEY
- Height of the chimney will be 275 M as per direction of Pollution Control Board.
- Intermediate platforms shall be placed at minimum spacing of 45 M.
- Outside the chimney to be painted with Red and white paint band alternatively . However last 50 M to be painted with acid and heat resistance paint.
- All components of chimney shall be designed for 5KN/M2.
- 25% additional loading to be taken as impact loading during liner erection.
- Limit of deflection of Girders shall be span/325 mm.
- Seismic and wind loads reference to be drawn from IS codes.
- Grade of concrete for chimney shell will be M30.
- Chimney design to be verified by " Wind Tunnel Test" conducted by reputed institution.
- Chimney flue duct shall be so designed that the flue gas velocity at exit point remain 20-25 m/sec at
normal operating conditions.
- Chimney is connected with flue gas duct through a transition piece having one end circular and other
end rectangular. Liner of the chimney is insulated either by resin bonded glass wool ( density 64
kg/cum ) or rock wool ( density 100kg/cu m/)
- Insulation thickness shall not be less than 100 mm overall.
- Chimney is provided with Rack and Pinion Elevator and aviation light on selected locations.
- A temporary lighting protection system shall be installed during construction after that permanent
system will be installed.
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Boiler/ESP ( Electrostatic Precipitator) support structure shall be designed for 1. Dead load 2. live /
imposed loads 3. Static and Dynamic loads for piping , rotating equipment etc. 4. Cable trays and
walkways supported on columns. 5. Ash water piping support 6. ESP hopper ash filled up condition
to the extent of top of the hopper . 7. To calculate the load the ash density to be taken 1350 kg/ m3
8. Ash load at the bottom of hopper and pent house as specified in the mechanical contract. 9. Wind
load and seismic load . 10. Temperature load ( +/- 25 c ) for atmospheric temperature variations. 11.
Temperature load for variation of temperature due to ESP operating conditions.
Boiler structure should be so designed that temperature of the structure should not go beyond 60 deg.
Bracing for pipe supports on ESP should be less than 10.0 Mtr height.
Plinth level of Boiler area will be 500mm higher than FGL ( Finished Grade Level).
Finished floor level of boiler area paving shall be kept about 200 mm lower than the finished floor
level of Main Plant buildings.
Foundation System General requirements are -
A. Foundations can be open ( isolated footing /raft) or pile foundation depending on soil report.
B. The design of foundations should be as per different IS codes.
C. No Major foundations should be on filled up soil.
D. Open foundations and pile foundations should not be combined in same structure.
E. Foundations should be designed on worst combination of loads.
F. For open foundations minimum width is 1.0 M and depth is 1.0M below NGL.
G. Permissible settlement of open foundation of 6.0 M and below span is 40mm
Permissible settlement of open foundation of 6.0 M and span(raft) is 75mm
Permissible settlement on weathering rock is 12mm.
H. For pile foundations the diameter of pile shall be 600mm diameter minimum . Vertical compression load will be 140MT. The uplift and lateral load capacity will be 20% and 5% respectively.
I. Initial Pile Load test to be carried out for each diameter.
Vertical (Compression) - 3
Lateral (Horizontal) - 3
Uplift (Tension) - 3
MAIN PLANT AND AUXILIARY PLANT BUILDING AND STRUCTURES.
-Main plant building shall consist of TG bay, De aerator bay, service
building / Control room
and all the auxiliary structures/facilities located there
.
- Mill and bunker bay.
AUXILIARY BUILDINGS
- Air compressor building
- Ash water pump house building.
-Air washing Building.
-Ash Slurry Pump House
-AC Plant Equipment Building
-Air handling Unit.
-CPU regeneration Unit.
- Fire water tank and Pump House Building.
- D.G Set.
- Compressor House Building.
- ESP control Room and VFD Room ( if required.)
- RCC twin compartment Potable overhead tank capacity 50 M3.
CHIMNEY
- Height of the chimney will be 275 M as per direction of Pollution Control Board.
- Intermediate platforms shall be placed at minimum spacing of 45 M.
- Outside the chimney to be painted with Red and white paint band alternatively . However last 50 M to be painted with acid and heat resistance paint.
- All components of chimney shall be designed for 5KN/M2.
- 25% additional loading to be taken as impact loading during liner erection.
- Limit of deflection of Girders shall be span/325 mm.
- Seismic and wind loads reference to be drawn from IS codes.
- Grade of concrete for chimney shell will be M30.
- Chimney design to be verified by " Wind Tunnel Test" conducted by reputed institution.
- Chimney flue duct shall be so designed that the flue gas velocity at exit point remain 20-25 m/sec at
normal operating conditions.
- Chimney is connected with flue gas duct through a transition piece having one end circular and other
end rectangular. Liner of the chimney is insulated either by resin bonded glass wool ( density 64
kg/cum ) or rock wool ( density 100kg/cu m/)
- Insulation thickness shall not be less than 100 mm overall.
- Chimney is provided with Rack and Pinion Elevator and aviation light on selected locations.
- A temporary lighting protection system shall be installed during construction after that permanent
system will be installed.
P.S If you are looking to earn few legitimate extra money from the comfort of your home then please click on the link given below
LINK 1 - PLEASE CLICK HERE
LINK 2 - PLEASE CLICK HERE
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