ANNEXURE-A

SALIENT TECHNICAL FEATURES

(Bottom ash, Fly ash, Ash Water & Dry ash system Stage-II)

PLANT OVERVIEW

NTPC Talcher-Kaniha (TSTPS) plant is located in Kaniha block under Talcher sub- division of Angul district in the state of Orissa.

Nearest Town :	Talcher 26 KMs
Nearest Railway Station : Talcher 29 KMs
Nearest Airport :	Bhubaneswar 180 KMs

INSTALLED CAPACITY

STAGE - I - 2 Units each 500 MW - Total 1000 MW

STAGE- II - 4 Units each 500 MW - Total 2000 MW

EQUIPMENTS INVOLVED

The equipment under consideration consists of

1.Bottom ash system in stage-II consist of dry bottom, water impacted bottom ash hoppers, clinker crusher and accessories supplied by M/S DCIPS.

2.The fly ash system in Stage-II having four passes in each unit is of Mahindra Ash Tech make. There are eighteen hoppers in each pass consisting of valves, pipes, vacuum pumps, fluidizing blower etc. and associated accessories.

3.Ash water system consist of various single and multi stage centrifugal (both horizontal and vertical) water handling pumps namely FAWP, BAHP, BALP, FASWP, Flushing Water pump, Cooling and cooling sealing water pumps, drain pumps etc mainly supplied by Kirloskar and Beacon weir and their associated components.

4.Dry ash system consists of Compressors (both reciprocating make Kirloskar Pneumatic & screw type make Atlas Copco), Buffer hoppers, air lock vessels, associated pipe lines and valves. It also involves Silo and associated pumps and blowers.

JOBS IN BRIEF

In general the contract consists of miscellaneous minor maintenance, preventive & breakdown maintenance and overhauling of the equipments mentioned above. Miscellaneous minor maintenance jobs consist of attending various problems occurring during shift. This covers daily checking of BA hoppers by opening circular manhole, removal of choking of Clinker Crusher, ESP, APH, ECO, ECO Bypass & BA Hoppers by poking, choking removal of CT/Air washer nozzles & discharge pipes, establishing shut off vacuum, line vacuum etc in both wet and dry ash systems & minor maintenance

jobs like gland tightening, attending leakage through tightening of flanges, oil top up etc. in stage-II AHP area (Bottom Ash, Fly Ash, Dry Ash & Ash water pump house) during shift. Apart from this, jobs like cleaning of BAH Overflow settling bin, cleaning of seal trough, cleaning of ash from ECO & ECO Bypass hoppers, cleaning of ash from Air pre heater hoppers etc are to be carried out during unit overhauling or opportunity shut downs.

Break down jobs involve activities to be carried out during equipment breakdowns involving repairing and replacement of components and spares of equipment concerned, replacement of pipes & valves (MS, CI and Basalt) starting from 15 to 400 NB, fabrication and replacement of bends, tees and laterals etc.

Preventive maintenance involves carrying out PM jobs as per periodic preventive maintenance schedules.

Overhauling jobs include equipment overhaul and also overhauling of components commensurate with unit overhaul. The job involves dismantling, servicing and reassembling the components like valves, bends, pipes and fittings, various pumps etc. Most of the work will be carried above 10 m height. Hence, workers need to have adequate skill and must be insured and informed to safely work in challenging conditions. Moreover mobilization is required at a very short notice keeping in mind the generation interests of the corporation. Contractor is required to arrange for the tools and tackles and consumables like gases and welding electrodes, cotton waste and cleaning agents required for the job as per the scope of work.

To meet the requirements arising out of emergency situations like heavy clinkering in bottom ash hoppers, huge choking of ESP hoppers, thickness survey of pipe lines etc. & also for any other jobs not listed in the scope of work, the contractor has to deploy extra man days as per the instruction of EIC.