ARC for maintenance of Boil...

Part A

Part-A activities:- General/routine/preventive maintenance by engagement of adequate labour as per scope of work of Part-A at Annexure-IV

Part B

Mobilization & attending the boiler tube leakage including cutting, welding, fit-up, and grinding and replacement of tube of all sizes and thickness of boiler upto 10 nos. joints. 3 Nos. Metal Build Up will count as one joint.

Mobilization & attending the boiler tube leakage including locking of furnace base (platform) at 11 mtr. Manhole and jhula with the help of winch machine arrangement by cutting, welding, fit-up, and grinding and replacement of tube of all sizes and thickness of boiler tube upto 10 nos. joints in divisional panel at 60 mtr. height in 1st pass. 3 Nos. Metal Build Up will count as one joint.

Attending boiler tube leakage/ tube replacement including cutting, welding, fit-up, grinding and welding of one no. Joints of tube of all sizes and any thickness of boiler in addition to above Sr. No. at 1&2.

Metal build up on worn out boiler tubes half round surface by HP welder up to 100 mm length (Two minor built up = 100 mm).

Attending leakage or other welding work of HP Joints on outside the boiler including replacement of pipe up to 1 Mtr. Length / valve / bends by cutting, welding, grinding and fit-up work for each joint.

Fin welding work on water wall tubes by IBR welder.

Lifting and lowering & refixing of economizer module / LTSH module for maintenance purpose (excluding any HP joints).

Casting refractory on boiler.

Providing of scaffolding & platform in the outside boiler area (height X length) with width (2 nos. Jali). Considering 1 m wide platform.

Erection / commissioning and operation of sky climber for full length of one furnace on both walls.

Stress relieving charges per day including all necessary instrumentation & manpower for First Day

Stress relieving charges per day including all necessary instrumentation & manpower for Subsequent days

Complete servicing/ replacement of valve spare including lapping of seat /disc dismantlement & re-erection / refitting. (Valves Gate/Globe/NRV Seats etc.)

Servicing of boiler safety valve including replacement of disc, spindle & other spare parts as per requirement

Checking of Burner Tilt Mechanism and rectification thereof a) Disconnections of all reach rods from burner tilt mechanism. b) Complete dismantling of burner tilt mechanism including removal of drive shaft after disconnecting from burner tilt power cylinder. Removal of burner tilt power cylinder from its position if required by C&I maintenance and refitting of same position & replacement of burner Tilt shear pin / other pins, if found damaged. c) Lubrication of pins, shafts, studs of reach rod etc. d) Repair/replacement of burner tilt components. e) Assembly & refitting of burner tilt mechanism f) Connections of all reach rods to burner tilt mechanism and zero setting of all nozzle tips. g) Repair/ replacement of drive shaft/ bushing, o- ring, shear pin, stationary pivot pin, square

Complete Overhauling of Pumps (All horizontal sump pumps, SSF Waste Sump pumps, BBD Quench Eff. Transfer pump, Fuel Oil Tank Area sump pumps, Oil water sump pumps, DM fill Pumps & DM Make- up Pumps)

Complete overhauling of air compressors of Firefighting system

To attend leakages in Underground/Overhead piping of various firefighting system at a distance of one meter on either side up to pipe OD 100mm to 350mm

Servicing of fire fighting pumps (Multi stage vertical pump) i.e hydrant pump, hydrant spray pump, DG hydrant pump, spray pump, jocky pump, booster pump

Replacement of underground/Over ground valve in the pit of size 150NB/200NB/250NB/ 300NB/350NB