Work contract for AOH of Boilers Pressure Part of Unit 3 at 2x660 MW, SSTPP, MPPGCL, Dongalia.

(SECTION-A)

PREPARATION/ERECTION OF QUICK ERECT SCAFFOLDING SYSTEM (CUP- LOCK SYSTEM) FROM TOP TO BOTTOM IN BOILER FURNACE WITHOUT CUP LOCK MATERIAL

INTERNAL CLEANING OF BOILER II ND PASS

CLEANING OF ASH FROM ECONOMIZER HOPPER, DEAD CHAMBER, CAT HOUSE DOG HOUSE

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

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 AND FRONT/REAR S- PANEL BACKSIDE, COVERING THE S- PANEL COMPLETELY WITH SHEETS FOR SIMULTANEOUS CHECKING, REPAIRING WORK IN BOTTOM ASH AREA AND FURNACE TOGATHER:

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-JET CLEANING METHOD.

COMPLETE EXTERNAL CLEANING OF THE BOILER FROM TOP TO BOTTOM

SECTION-B

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

PREPARATION OF BOILER TUBE SURFACE FOR TUBE THICKNESS SURVEY

SECTION-C 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

CHECKING AND RECTIFICATION OF SUPPORTS/HANGERS OF CRITICAL PIPE LINES

CHECKING AND RECTIFICATION OF EXPANSION INDICATOR IN BOILER AREA

(SECTION-D) 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-E)

COMPLETE SERVICING/OVERHAULING OF HP VALVES (MIV/MOV)

>25 mm & upto 50 mm

>50mm & upto 100 mm

>100 mm & upto200 mm

Above 200 mm

COMPLETE SERVICING OF CONTROL 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

(SECTION-F) 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-G)

PREPARATION OF HP TUBE BENDS

REPAIR OF PENT HOUSE/SKIN CASING OF BOILER

REPAIRING OF DEAD CHAMBER

(SECTION H) APPLICATION OF THERMAL INSULATION

COMPLETE BOILER FROM BOTTOM ASH HOPPER TO PENT HOUSE

STEAM AND WATER PIPING

AIR HEATER, DUCT & HOPPER

FUEL OIL AND ITS STEAM PIPING INCLUDING HEATERS FILTERS ETC.

(SECTION I)

SERVICING OF MAIN STEAM STOP VALVE

(SECTION J)

COMPLETE OVERHAULING & RESETTING OF WATER WALL SOOT BLOWER

COMPLETE OVERHAULING & RESETTING OF LONG RETRACTABLE SOOT BLOWER

(SECTION K)

work of installation and implementation of CCTV survillance system during AOH.