AOH of Boiler Pressure Parts of Unit No. 3 and 4 at 2X660 MW, SSTPP, MPPGCL, Dongalia.

SECTION-1

PREPARATION OF QUICK ERECT SCAFFOLDING SYSTEM (CUP-LOCK SYSTEM) IN FIRST PASS FROM BOTTOM ASH HOPPER TO ROOF OF FURNACE INCLUDING SECONDARY SUPER HEATER

INTERNAL CLEANING OF BOILER I ST PASS WITH THE HELP OF SKY CLIMBER BY PREPARATION OF SCAFFOLDING AT ASH PANEL FOR ASSEMBLY OF SKY-CLIMBER AND INSPECTION OF ASH PANEL TUBE

INTERNAL CLEANING OF BOILER II ND PASS

CLEANING OF ASH FROM ECONOMIZER HOPPER, DEAD CHAMBER, PENT HOUSE.

PREPARATION OF SCAFFOLDING IN BOILER HORIZONTAL PASS (SCREEN TUBES, RE-HEATER HANGER, SUPER HEATER HANGER TUBES,ECONOMIZER HANGER )

PREPARATION OF SCAFFOLDING ABOVE ECONOMIZER HOPPER FOR INSPECTION OF ECONOMISER LOWER BANK COILS.

PREPARATION OF SCAFFOLDING AT WW RING HEADER FOR INSPECTION OF RING HEADER & REFIXING/REPLACEMENT OF ORIFICES.

INSPECTION OF COMPLETE BOILER PRESSURE PARTS (I ST & II ND PASS)

INSPECTION/REPAIR OF ALL PEEP HOLES IN BOILER

CLEANING AND REPAIR OF All WIND BOXES

SERVICING OF SECONDARY/ADDITIONAL AIR PORT DAMPERS

PREPARATION OF SCAFFOLDING IN BOTTOM ASH HOPPER FOR REPAIR AND RE-FIXING OF SEAL PLATES OF WATERWALL ASH PANEL TROUGH SEAL AND FOR REFRATORY WORK IN BOTTOM ASH HOPPERS.

DYE PENETRATIONN TEST (DPT)

TRANSPORTATION OF ASH, SCRAPS,DEBRIS AND OTHER WASTE MATERIAL(INCL. LOADING./UNLOADING)

THOROUGH CLEANING OF BOILER FROM INSIDE BY USING HYDRO-JETTING METHOD

SECTION-2

RECTIFICATION, REPLACEMENT AND REFIXING OF PROTECTION SLEEVE (SHIELDING) IN VARIOUS AREAS OF BOILER TUBES.

PREPARATION OF BOILER TUBE SURFACE FOR TUBE THICKNESS SURVEY

SECTION-3 WELDING OF HP JOINTS AND ALIGHMENTOF BOILER TUBES/COILS/BANKS

WATER WALL TUBES( PRIMARY AND SECONDARY PASS)/RIFLE TUBES,SCREEN TUBES, HANGER TUBES ETC.

PRIMARY SUPER HEATER TUBES

SECONDARY SUPER HEATER TUBES

TERTIARY SUPER HEATER TUBES

PRIMARY SUPERHEATER SUPPORT/HANGER TUBES

PRIMARY REHEATER SUPPORT/HANGER TUBES

PRIMARY AND SECONDARY REHEATER TUBES

ROOF TUBES

ECONOMIZER SUPPORT TUBES

ECONOMIZER COILS IN REHEATER AND SUPERHEATER PASS

ALIGNMENT OF COILS OF TERTIARY/FINAL SUPERHEATERS

ALIGNMENT OF COILS OF SECONDARY SUPERHEATERS

ALIGNMENT OF COILS OF SECONDRY/FINAL REHEATERS

ALIGNMENT OF COIL OF ECONOMIZER

ALIGNMENT OF COIL OF PRIMARY SUPERHEATER

ALIGNMENT OF PRIMARY REHEATER COIL

WELDING OF FINS

RE-ENFORCEMENT OF WELDED JOINTS

PAD WELDING OF BOILER TUBES AT VARIOUS LOCATIONS ( SIZE 50mmX50mm)

CHECKING AND RECTIFICATION OF SUPPORTS/HANGERS OF CRITICAL PIPE LINES

CHECKING AND RECTIFICATION OF EXPANSION INDICATOR IN BOILER AREA

APPLICATION/REPAIR OF REFRACTORY(WHYTHEAT C/WHYTHEAT C PATCH) / BSF BLANKET AT VARIOUS LOCATIONS OF BOILER

BOTTOM ASH HOPPER GR-C

PENT HOUSE, DOORS & WINDOWS ETC. (ADDITIONAL AIR PORT/WATERWALL TUBES) GR.-C/HTC

MAN HOLES, PEEP HOLES, ROOF SEAL BOXES GR-C

HYDRAULIC TEST OF BOILER PRESSURE PART & PREPARATION FOR BOILER LIGHT UP

SECTION-5

COMPLETE SERVICING/OVERHAULING OF HP VALVES (MIV)

>25 mm & upto 50 mm

>50mm & upto 100 mm

>100 mm & upto200 mm

Above 200 mm

COMPLETE SERVICING OF VALVES (EXCLUDING ACTUATOR):

>25 mm & upto 50 mm

>50mm & upto 100 mm

>100 mm & upto200 mm

Above 200 mm

REPLACEMENT OF VALVES (WELDED TYPE)

Upto 25 mm

>25 mm & upto 50 mm

>50mm & upto 100 mm

COMPLETE SERVICING OF SPRING LOADED SAFETY VALVES

WATER SEPARATOR SV

MAIN STEAM LINES SV

CRH LINES SV

HRH LINES SV

ELECTROMATIC RELIEF VALVE AND PILOT VALVE

SECTION-7

PREPARATION OF HP TUBE BENDS

REPAIR OF PENT HOUSE/SKIN CASING OF BOILER

REPAIRING OF DEAD CHAMBER

APPLICATION OF THERMAL INSULATION

COMPLETE BOILER FROM BOTTOM ASH HOPPER TO PENT HOUSE

STEAM AND WATER PIPING

AIR HEATER & HOPPER

FUEL OIL AND ITS STEAM PIPING INCLUDING HEATERS FILTERS ETC.

SECTION-9

SERVICING OF MAIN STEAM STOP VALVE

SECTION-10

COMPLETE OVERHAULING & RESETTING OF WATER WALL SOOT BLOWER: -

COMPLETE OVERHAULING & RESETTING OF LONG RETRACTABLE SOOT BLOWER: -

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